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-rw-r--r--contrib/lua-lpeg/CMakeLists.txt9
-rw-r--r--contrib/lua-lpeg/LICENSE19
-rw-r--r--contrib/lua-lpeg/lpcap.c555
-rw-r--r--contrib/lua-lpeg/lpcap.h57
-rw-r--r--contrib/lua-lpeg/lpcode.c1014
-rw-r--r--contrib/lua-lpeg/lpcode.h40
-rw-r--r--contrib/lua-lpeg/lpegre.lua267
-rw-r--r--contrib/lua-lpeg/lpprint.c244
-rw-r--r--contrib/lua-lpeg/lpprint.h36
-rw-r--r--contrib/lua-lpeg/lptree.c1319
-rw-r--r--contrib/lua-lpeg/lptree.h77
-rw-r--r--contrib/lua-lpeg/lptypes.h154
-rw-r--r--contrib/lua-lpeg/lpvm.c383
-rw-r--r--contrib/lua-lpeg/lpvm.h58
14 files changed, 4232 insertions, 0 deletions
diff --git a/contrib/lua-lpeg/CMakeLists.txt b/contrib/lua-lpeg/CMakeLists.txt
new file mode 100644
index 0000000..92dd018
--- /dev/null
+++ b/contrib/lua-lpeg/CMakeLists.txt
@@ -0,0 +1,9 @@
+SET(LPEGSRC lpcap.c
+ lpcode.c
+ lpprint.c
+ lptree.c
+ lpvm.c)
+
+SET(LIB_TYPE STATIC)
+ADD_LIBRARY(rspamd-lpeg ${LIB_TYPE} ${LPEGSRC})
+set_target_properties(rspamd-lpeg PROPERTIES COMPILE_FLAGS "${LPEG_CFLAGS}")
diff --git a/contrib/lua-lpeg/LICENSE b/contrib/lua-lpeg/LICENSE
new file mode 100644
index 0000000..cea2d8b
--- /dev/null
+++ b/contrib/lua-lpeg/LICENSE
@@ -0,0 +1,19 @@
+Copyright © 2007-2015 Lua.org, PUC-Rio.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/contrib/lua-lpeg/lpcap.c b/contrib/lua-lpeg/lpcap.c
new file mode 100644
index 0000000..b332fde
--- /dev/null
+++ b/contrib/lua-lpeg/lpcap.c
@@ -0,0 +1,555 @@
+/*
+** $Id: lpcap.c $
+** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+*/
+
+#include "lua.h"
+#include "lauxlib.h"
+
+#include "lpcap.h"
+#include "lptypes.h"
+
+
+#define captype(cap) ((cap)->kind)
+
+#define isclosecap(cap) (captype(cap) == Cclose)
+
+#define closeaddr(c) ((c)->s + (c)->siz - 1)
+
+#define isfullcap(cap) ((cap)->siz != 0)
+
+#define getfromktable(cs,v) lua_rawgeti((cs)->L, ktableidx((cs)->ptop), v)
+
+#define pushluaval(cs) getfromktable(cs, (cs)->cap->idx)
+
+
+
+/*
+** Put at the cache for Lua values the value indexed by 'v' in ktable
+** of the running pattern (if it is not there yet); returns its index.
+*/
+static int updatecache (CapState *cs, int v) {
+ int idx = cs->ptop + 1; /* stack index of cache for Lua values */
+ if (v != cs->valuecached) { /* not there? */
+ getfromktable(cs, v); /* get value from 'ktable' */
+ lua_replace(cs->L, idx); /* put it at reserved stack position */
+ cs->valuecached = v; /* keep track of what is there */
+ }
+ return idx;
+}
+
+
+static int pushcapture (CapState *cs);
+
+
+/*
+** Goes back in a list of captures looking for an open capture
+** corresponding to a close
+*/
+static Capture *findopen (Capture *cap) {
+ int n = 0; /* number of closes waiting an open */
+ for (;;) {
+ cap--;
+ if (isclosecap(cap)) n++; /* one more open to skip */
+ else if (!isfullcap(cap))
+ if (n-- == 0) return cap;
+ }
+}
+
+
+/*
+** Go to the next capture
+*/
+static void nextcap (CapState *cs) {
+ Capture *cap = cs->cap;
+ if (!isfullcap(cap)) { /* not a single capture? */
+ int n = 0; /* number of opens waiting a close */
+ for (;;) { /* look for corresponding close */
+ cap++;
+ if (isclosecap(cap)) {
+ if (n-- == 0) break;
+ }
+ else if (!isfullcap(cap)) n++;
+ }
+ }
+ cs->cap = cap + 1; /* + 1 to skip last close (or entire single capture) */
+}
+
+
+/*
+** Push on the Lua stack all values generated by nested captures inside
+** the current capture. Returns number of values pushed. 'addextra'
+** makes it push the entire match after all captured values. The
+** entire match is pushed also if there are no other nested values,
+** so the function never returns zero.
+*/
+static int pushnestedvalues (CapState *cs, int addextra) {
+ Capture *co = cs->cap;
+ if (isfullcap(cs->cap++)) { /* no nested captures? */
+ lua_pushlstring(cs->L, co->s, co->siz - 1); /* push whole match */
+ return 1; /* that is it */
+ }
+ else {
+ int n = 0;
+ while (!isclosecap(cs->cap)) /* repeat for all nested patterns */
+ n += pushcapture(cs);
+ if (addextra || n == 0) { /* need extra? */
+ lua_pushlstring(cs->L, co->s, cs->cap->s - co->s); /* push whole match */
+ n++;
+ }
+ cs->cap++; /* skip close entry */
+ return n;
+ }
+}
+
+
+/*
+** Push only the first value generated by nested captures
+*/
+static void pushonenestedvalue (CapState *cs) {
+ int n = pushnestedvalues(cs, 0);
+ if (n > 1)
+ lua_pop(cs->L, n - 1); /* pop extra values */
+}
+
+
+/*
+** Try to find a named group capture with the name given at the top of
+** the stack; goes backward from 'cap'.
+*/
+static Capture *findback (CapState *cs, Capture *cap) {
+ lua_State *L = cs->L;
+ while (cap-- > cs->ocap) { /* repeat until end of list */
+ if (isclosecap(cap))
+ cap = findopen(cap); /* skip nested captures */
+ else if (!isfullcap(cap))
+ continue; /* opening an enclosing capture: skip and get previous */
+ if (captype(cap) == Cgroup) {
+ getfromktable(cs, cap->idx); /* get group name */
+ if (lp_equal(L, -2, -1)) { /* right group? */
+ lua_pop(L, 2); /* remove reference name and group name */
+ return cap;
+ }
+ else lua_pop(L, 1); /* remove group name */
+ }
+ }
+ luaL_error(L, "back reference '%s' not found", lua_tostring(L, -1));
+ return NULL; /* to avoid warnings */
+}
+
+
+/*
+** Back-reference capture. Return number of values pushed.
+*/
+static int backrefcap (CapState *cs) {
+ int n;
+ Capture *curr = cs->cap;
+ pushluaval(cs); /* reference name */
+ cs->cap = findback(cs, curr); /* find corresponding group */
+ n = pushnestedvalues(cs, 0); /* push group's values */
+ cs->cap = curr + 1;
+ return n;
+}
+
+
+/*
+** Table capture: creates a new table and populates it with nested
+** captures.
+*/
+static int tablecap (CapState *cs) {
+ lua_State *L = cs->L;
+ int n = 0;
+ lua_newtable(L);
+ if (isfullcap(cs->cap++))
+ return 1; /* table is empty */
+ while (!isclosecap(cs->cap)) {
+ if (captype(cs->cap) == Cgroup && cs->cap->idx != 0) { /* named group? */
+ pushluaval(cs); /* push group name */
+ pushonenestedvalue(cs);
+ lua_settable(L, -3);
+ }
+ else { /* not a named group */
+ int i;
+ int k = pushcapture(cs);
+ for (i = k; i > 0; i--) /* store all values into table */
+ lua_rawseti(L, -(i + 1), n + i);
+ n += k;
+ }
+ }
+ cs->cap++; /* skip close entry */
+ return 1; /* number of values pushed (only the table) */
+}
+
+
+/*
+** Table-query capture
+*/
+static int querycap (CapState *cs) {
+ int idx = cs->cap->idx;
+ pushonenestedvalue(cs); /* get nested capture */
+ lua_gettable(cs->L, updatecache(cs, idx)); /* query cap. value at table */
+ if (!lua_isnil(cs->L, -1))
+ return 1;
+ else { /* no value */
+ lua_pop(cs->L, 1); /* remove nil */
+ return 0;
+ }
+}
+
+
+/*
+** Fold capture
+*/
+static int foldcap (CapState *cs) {
+ int n;
+ lua_State *L = cs->L;
+ int idx = cs->cap->idx;
+ if (isfullcap(cs->cap++) || /* no nested captures? */
+ isclosecap(cs->cap) || /* no nested captures (large subject)? */
+ (n = pushcapture(cs)) == 0) /* nested captures with no values? */
+ return luaL_error(L, "no initial value for fold capture");
+ if (n > 1)
+ lua_pop(L, n - 1); /* leave only one result for accumulator */
+ while (!isclosecap(cs->cap)) {
+ lua_pushvalue(L, updatecache(cs, idx)); /* get folding function */
+ lua_insert(L, -2); /* put it before accumulator */
+ n = pushcapture(cs); /* get next capture's values */
+ lua_call(L, n + 1, 1); /* call folding function */
+ }
+ cs->cap++; /* skip close entry */
+ return 1; /* only accumulator left on the stack */
+}
+
+
+/*
+** Function capture
+*/
+static int functioncap (CapState *cs) {
+ int n;
+ int top = lua_gettop(cs->L);
+ pushluaval(cs); /* push function */
+ n = pushnestedvalues(cs, 0); /* push nested captures */
+ lua_call(cs->L, n, LUA_MULTRET); /* call function */
+ return lua_gettop(cs->L) - top; /* return function's results */
+}
+
+
+/*
+** Select capture
+*/
+static int numcap (CapState *cs) {
+ int idx = cs->cap->idx; /* value to select */
+ if (idx == 0) { /* no values? */
+ nextcap(cs); /* skip entire capture */
+ return 0; /* no value produced */
+ }
+ else {
+ int n = pushnestedvalues(cs, 0);
+ if (n < idx) /* invalid index? */
+ return luaL_error(cs->L, "no capture '%d'", idx);
+ else {
+ lua_pushvalue(cs->L, -(n - idx + 1)); /* get selected capture */
+ lua_replace(cs->L, -(n + 1)); /* put it in place of 1st capture */
+ lua_pop(cs->L, n - 1); /* remove other captures */
+ return 1;
+ }
+ }
+}
+
+
+/*
+** Return the stack index of the first runtime capture in the given
+** list of captures (or zero if no runtime captures)
+*/
+int finddyncap (Capture *cap, Capture *last) {
+ for (; cap < last; cap++) {
+ if (cap->kind == Cruntime)
+ return cap->idx; /* stack position of first capture */
+ }
+ return 0; /* no dynamic captures in this segment */
+}
+
+
+/*
+** Calls a runtime capture. Returns number of captures "removed" by the
+** call, that is, those inside the group capture. Captures to be added
+** are on the Lua stack.
+*/
+int runtimecap (CapState *cs, Capture *close, const char *s, int *rem) {
+ int n, id;
+ lua_State *L = cs->L;
+ int otop = lua_gettop(L);
+ Capture *open = findopen(close); /* get open group capture */
+ assert(captype(open) == Cgroup);
+ id = finddyncap(open, close); /* get first dynamic capture argument */
+ close->kind = Cclose; /* closes the group */
+ close->s = s;
+ cs->cap = open; cs->valuecached = 0; /* prepare capture state */
+ luaL_checkstack(L, 4, "too many runtime captures");
+ pushluaval(cs); /* push function to be called */
+ lua_pushvalue(L, SUBJIDX); /* push original subject */
+ lua_pushinteger(L, s - cs->s + 1); /* push current position */
+ n = pushnestedvalues(cs, 0); /* push nested captures */
+ lua_call(L, n + 2, LUA_MULTRET); /* call dynamic function */
+ if (id > 0) { /* are there old dynamic captures to be removed? */
+ int i;
+ for (i = id; i <= otop; i++)
+ lua_remove(L, id); /* remove old dynamic captures */
+ *rem = otop - id + 1; /* total number of dynamic captures removed */
+ }
+ else
+ *rem = 0; /* no dynamic captures removed */
+ return close - open - 1; /* number of captures to be removed */
+}
+
+
+/*
+** Auxiliary structure for substitution and string captures: keep
+** information about nested captures for future use, avoiding to push
+** string results into Lua
+*/
+typedef struct StrAux {
+ int isstring; /* whether capture is a string */
+ union {
+ Capture *cp; /* if not a string, respective capture */
+ struct { /* if it is a string... */
+ const char *s; /* ... starts here */
+ const char *e; /* ... ends here */
+ } s;
+ } u;
+} StrAux;
+
+#define MAXSTRCAPS 10
+
+/*
+** Collect values from current capture into array 'cps'. Current
+** capture must be Cstring (first call) or Csimple (recursive calls).
+** (In first call, fills %0 with whole match for Cstring.)
+** Returns number of elements in the array that were filled.
+*/
+static int getstrcaps (CapState *cs, StrAux *cps, int n) {
+ int k = n++;
+ cps[k].isstring = 1; /* get string value */
+ cps[k].u.s.s = cs->cap->s; /* starts here */
+ if (!isfullcap(cs->cap++)) { /* nested captures? */
+ while (!isclosecap(cs->cap)) { /* traverse them */
+ if (n >= MAXSTRCAPS) /* too many captures? */
+ nextcap(cs); /* skip extra captures (will not need them) */
+ else if (captype(cs->cap) == Csimple) /* string? */
+ n = getstrcaps(cs, cps, n); /* put info. into array */
+ else {
+ cps[n].isstring = 0; /* not a string */
+ cps[n].u.cp = cs->cap; /* keep original capture */
+ nextcap(cs);
+ n++;
+ }
+ }
+ cs->cap++; /* skip close */
+ }
+ cps[k].u.s.e = closeaddr(cs->cap - 1); /* ends here */
+ return n;
+}
+
+
+/*
+** add next capture value (which should be a string) to buffer 'b'
+*/
+static int addonestring (luaL_Buffer *b, CapState *cs, const char *what);
+
+
+/*
+** String capture: add result to buffer 'b' (instead of pushing
+** it into the stack)
+*/
+static void stringcap (luaL_Buffer *b, CapState *cs) {
+ StrAux cps[MAXSTRCAPS];
+ int n;
+ size_t len, i;
+ const char *fmt; /* format string */
+ fmt = lua_tolstring(cs->L, updatecache(cs, cs->cap->idx), &len);
+ n = getstrcaps(cs, cps, 0) - 1; /* collect nested captures */
+ for (i = 0; i < len; i++) { /* traverse them */
+ if (fmt[i] != '%') /* not an escape? */
+ luaL_addchar(b, fmt[i]); /* add it to buffer */
+ else if (fmt[++i] < '0' || fmt[i] > '9') /* not followed by a digit? */
+ luaL_addchar(b, fmt[i]); /* add to buffer */
+ else {
+ int l = fmt[i] - '0'; /* capture index */
+ if (l > n)
+ luaL_error(cs->L, "invalid capture index (%d)", l);
+ else if (cps[l].isstring)
+ luaL_addlstring(b, cps[l].u.s.s, cps[l].u.s.e - cps[l].u.s.s);
+ else {
+ Capture *curr = cs->cap;
+ cs->cap = cps[l].u.cp; /* go back to evaluate that nested capture */
+ if (!addonestring(b, cs, "capture"))
+ luaL_error(cs->L, "no values in capture index %d", l);
+ cs->cap = curr; /* continue from where it stopped */
+ }
+ }
+ }
+}
+
+
+/*
+** Substitution capture: add result to buffer 'b'
+*/
+static void substcap (luaL_Buffer *b, CapState *cs) {
+ const char *curr = cs->cap->s;
+ if (isfullcap(cs->cap)) /* no nested captures? */
+ luaL_addlstring(b, curr, cs->cap->siz - 1); /* keep original text */
+ else {
+ cs->cap++; /* skip open entry */
+ while (!isclosecap(cs->cap)) { /* traverse nested captures */
+ const char *next = cs->cap->s;
+ luaL_addlstring(b, curr, next - curr); /* add text up to capture */
+ if (addonestring(b, cs, "replacement"))
+ curr = closeaddr(cs->cap - 1); /* continue after match */
+ else /* no capture value */
+ curr = next; /* keep original text in final result */
+ }
+ luaL_addlstring(b, curr, cs->cap->s - curr); /* add last piece of text */
+ }
+ cs->cap++; /* go to next capture */
+}
+
+
+/*
+** Evaluates a capture and adds its first value to buffer 'b'; returns
+** whether there was a value
+*/
+static int addonestring (luaL_Buffer *b, CapState *cs, const char *what) {
+ switch (captype(cs->cap)) {
+ case Cstring:
+ stringcap(b, cs); /* add capture directly to buffer */
+ return 1;
+ case Csubst:
+ substcap(b, cs); /* add capture directly to buffer */
+ return 1;
+ default: {
+ lua_State *L = cs->L;
+ int n = pushcapture(cs);
+ if (n > 0) {
+ if (n > 1) lua_pop(L, n - 1); /* only one result */
+ if (!lua_isstring(L, -1))
+ luaL_error(L, "invalid %s value (a %s)", what, luaL_typename(L, -1));
+ luaL_addvalue(b);
+ }
+ return n;
+ }
+ }
+}
+
+
+#if !defined(MAXRECLEVEL)
+#define MAXRECLEVEL 200
+#endif
+
+
+/*
+** Push all values of the current capture into the stack; returns
+** number of values pushed
+*/
+static int pushcapture (CapState *cs) {
+ lua_State *L = cs->L;
+ int res;
+ luaL_checkstack(L, 4, "too many captures");
+ if (cs->reclevel++ > MAXRECLEVEL)
+ return luaL_error(L, "subcapture nesting too deep");
+ switch (captype(cs->cap)) {
+ case Cposition: {
+ lua_pushinteger(L, cs->cap->s - cs->s + 1);
+ cs->cap++;
+ res = 1;
+ break;
+ }
+ case Cconst: {
+ pushluaval(cs);
+ cs->cap++;
+ res = 1;
+ break;
+ }
+ case Carg: {
+ int arg = (cs->cap++)->idx;
+ if (arg + FIXEDARGS > cs->ptop)
+ return luaL_error(L, "reference to absent extra argument #%d", arg);
+ lua_pushvalue(L, arg + FIXEDARGS);
+ res = 1;
+ break;
+ }
+ case Csimple: {
+ int k = pushnestedvalues(cs, 1);
+ lua_insert(L, -k); /* make whole match be first result */
+ res = k;
+ break;
+ }
+ case Cruntime: {
+ lua_pushvalue(L, (cs->cap++)->idx); /* value is in the stack */
+ res = 1;
+ break;
+ }
+ case Cstring: {
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ stringcap(&b, cs);
+ luaL_pushresult(&b);
+ res = 1;
+ break;
+ }
+ case Csubst: {
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ substcap(&b, cs);
+ luaL_pushresult(&b);
+ res = 1;
+ break;
+ }
+ case Cgroup: {
+ if (cs->cap->idx == 0) /* anonymous group? */
+ res = pushnestedvalues(cs, 0); /* add all nested values */
+ else { /* named group: add no values */
+ nextcap(cs); /* skip capture */
+ res = 0;
+ }
+ break;
+ }
+ case Cbackref: res = backrefcap(cs); break;
+ case Ctable: res = tablecap(cs); break;
+ case Cfunction: res = functioncap(cs); break;
+ case Cnum: res = numcap(cs); break;
+ case Cquery: res = querycap(cs); break;
+ case Cfold: res = foldcap(cs); break;
+ default: assert(0); res = 0;
+ }
+ cs->reclevel--;
+ return res;
+}
+
+
+/*
+** Prepare a CapState structure and traverse the entire list of
+** captures in the stack pushing its results. 's' is the subject
+** string, 'r' is the final position of the match, and 'ptop'
+** the index in the stack where some useful values were pushed.
+** Returns the number of results pushed. (If the list produces no
+** results, push the final position of the match.)
+*/
+int getcaptures (lua_State *L, const char *s, const char *r, int ptop) {
+ Capture *capture = (Capture *)lua_touserdata(L, caplistidx(ptop));
+ int n = 0;
+ if (!isclosecap(capture)) { /* is there any capture? */
+ CapState cs;
+ cs.ocap = cs.cap = capture; cs.L = L; cs.reclevel = 0;
+ cs.s = s; cs.valuecached = 0; cs.ptop = ptop;
+ do { /* collect their values */
+ n += pushcapture(&cs);
+ } while (!isclosecap(cs.cap));
+ }
+ if (n == 0) { /* no capture values? */
+ lua_pushinteger(L, r - s + 1); /* return only end position */
+ n = 1;
+ }
+ return n;
+}
+
+
diff --git a/contrib/lua-lpeg/lpcap.h b/contrib/lua-lpeg/lpcap.h
new file mode 100644
index 0000000..dc10d69
--- /dev/null
+++ b/contrib/lua-lpeg/lpcap.h
@@ -0,0 +1,57 @@
+/*
+** $Id: lpcap.h $
+*/
+
+#if !defined(lpcap_h)
+#define lpcap_h
+
+
+#include "lptypes.h"
+
+
+/* kinds of captures */
+typedef enum CapKind {
+ Cclose, /* not used in trees */
+ Cposition,
+ Cconst, /* ktable[key] is Lua constant */
+ Cbackref, /* ktable[key] is "name" of group to get capture */
+ Carg, /* 'key' is arg's number */
+ Csimple, /* next node is pattern */
+ Ctable, /* next node is pattern */
+ Cfunction, /* ktable[key] is function; next node is pattern */
+ Cquery, /* ktable[key] is table; next node is pattern */
+ Cstring, /* ktable[key] is string; next node is pattern */
+ Cnum, /* numbered capture; 'key' is number of value to return */
+ Csubst, /* substitution capture; next node is pattern */
+ Cfold, /* ktable[key] is function; next node is pattern */
+ Cruntime, /* not used in trees (is uses another type for tree) */
+ Cgroup /* ktable[key] is group's "name" */
+} CapKind;
+
+
+typedef struct Capture {
+ const char *s; /* subject position */
+ unsigned short idx; /* extra info (group name, arg index, etc.) */
+ byte kind; /* kind of capture */
+ byte siz; /* size of full capture + 1 (0 = not a full capture) */
+} Capture;
+
+
+typedef struct CapState {
+ Capture *cap; /* current capture */
+ Capture *ocap; /* (original) capture list */
+ lua_State *L;
+ int ptop; /* index of last argument to 'match' */
+ const char *s; /* original string */
+ int valuecached; /* value stored in cache slot */
+ int reclevel; /* recursion level */
+} CapState;
+
+
+int runtimecap (CapState *cs, Capture *close, const char *s, int *rem);
+int getcaptures (lua_State *L, const char *s, const char *r, int ptop);
+int finddyncap (Capture *cap, Capture *last);
+
+#endif
+
+
diff --git a/contrib/lua-lpeg/lpcode.c b/contrib/lua-lpeg/lpcode.c
new file mode 100644
index 0000000..3923459
--- /dev/null
+++ b/contrib/lua-lpeg/lpcode.c
@@ -0,0 +1,1014 @@
+/*
+** $Id: lpcode.c $
+** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+*/
+
+#include <limits.h>
+
+
+#include "lua.h"
+#include "lauxlib.h"
+
+#include "lptypes.h"
+#include "lpcode.h"
+
+
+/* signals a "no-instruction */
+#define NOINST -1
+
+
+
+static const Charset fullset_ =
+ {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}};
+
+static const Charset *fullset = &fullset_;
+
+/*
+** {======================================================
+** Analysis and some optimizations
+** =======================================================
+*/
+
+/*
+** Check whether a charset is empty (returns IFail), singleton (IChar),
+** full (IAny), or none of those (ISet). When singleton, '*c' returns
+** which character it is. (When generic set, the set was the input,
+** so there is no need to return it.)
+*/
+static Opcode charsettype (const byte *cs, int *c) {
+ int count = 0; /* number of characters in the set */
+ int i;
+ int candidate = -1; /* candidate position for the singleton char */
+ for (i = 0; i < CHARSETSIZE; i++) { /* for each byte */
+ int b = cs[i];
+ if (b == 0) { /* is byte empty? */
+ if (count > 1) /* was set neither empty nor singleton? */
+ return ISet; /* neither full nor empty nor singleton */
+ /* else set is still empty or singleton */
+ }
+ else if (b == 0xFF) { /* is byte full? */
+ if (count < (i * BITSPERCHAR)) /* was set not full? */
+ return ISet; /* neither full nor empty nor singleton */
+ else count += BITSPERCHAR; /* set is still full */
+ }
+ else if ((b & (b - 1)) == 0) { /* has byte only one bit? */
+ if (count > 0) /* was set not empty? */
+ return ISet; /* neither full nor empty nor singleton */
+ else { /* set has only one char till now; track it */
+ count++;
+ candidate = i;
+ }
+ }
+ else return ISet; /* byte is neither empty, full, nor singleton */
+ }
+ switch (count) {
+ case 0: return IFail; /* empty set */
+ case 1: { /* singleton; find character bit inside byte */
+ int b = cs[candidate];
+ *c = candidate * BITSPERCHAR;
+ if ((b & 0xF0) != 0) { *c += 4; b >>= 4; }
+ if ((b & 0x0C) != 0) { *c += 2; b >>= 2; }
+ if ((b & 0x02) != 0) { *c += 1; }
+ return IChar;
+ }
+ default: {
+ assert(count == CHARSETSIZE * BITSPERCHAR); /* full set */
+ return IAny;
+ }
+ }
+}
+
+
+/*
+** A few basic operations on Charsets
+*/
+static void cs_complement (Charset *cs) {
+ loopset(i, cs->cs[i] = ~cs->cs[i]);
+}
+
+static int cs_equal (const byte *cs1, const byte *cs2) {
+ loopset(i, if (cs1[i] != cs2[i]) return 0);
+ return 1;
+}
+
+static int cs_disjoint (const Charset *cs1, const Charset *cs2) {
+ loopset(i, if ((cs1->cs[i] & cs2->cs[i]) != 0) return 0;)
+ return 1;
+}
+
+
+/*
+** If 'tree' is a 'char' pattern (TSet, TChar, TAny), convert it into a
+** charset and return 1; else return 0.
+*/
+int tocharset (TTree *tree, Charset *cs) {
+ switch (tree->tag) {
+ case TSet: { /* copy set */
+ loopset(i, cs->cs[i] = treebuffer(tree)[i]);
+ return 1;
+ }
+ case TChar: { /* only one char */
+ assert(0 <= tree->u.n && tree->u.n <= UCHAR_MAX);
+ loopset(i, cs->cs[i] = 0); /* erase all chars */
+ setchar(cs->cs, tree->u.n); /* add that one */
+ return 1;
+ }
+ case TAny: {
+ loopset(i, cs->cs[i] = 0xFF); /* add all characters to the set */
+ return 1;
+ }
+ default: return 0;
+ }
+}
+
+
+/*
+** Visit a TCall node taking care to stop recursion. If node not yet
+** visited, return 'f(sib2(tree))', otherwise return 'def' (default
+** value)
+*/
+static int callrecursive (TTree *tree, int f (TTree *t), int def) {
+ int key = tree->key;
+ assert(tree->tag == TCall);
+ assert(sib2(tree)->tag == TRule);
+ if (key == 0) /* node already visited? */
+ return def; /* return default value */
+ else { /* first visit */
+ int result;
+ tree->key = 0; /* mark call as already visited */
+ result = f(sib2(tree)); /* go to called rule */
+ tree->key = key; /* restore tree */
+ return result;
+ }
+}
+
+
+/*
+** Check whether a pattern tree has captures
+*/
+int hascaptures (TTree *tree) {
+ tailcall:
+ switch (tree->tag) {
+ case TCapture: case TRunTime:
+ return 1;
+ case TCall:
+ return callrecursive(tree, hascaptures, 0);
+ case TRule: /* do not follow siblings */
+ tree = sib1(tree); goto tailcall;
+ case TOpenCall: assert(0);
+ default: {
+ switch (numsiblings[tree->tag]) {
+ case 1: /* return hascaptures(sib1(tree)); */
+ tree = sib1(tree); goto tailcall;
+ case 2:
+ if (hascaptures(sib1(tree)))
+ return 1;
+ /* else return hascaptures(sib2(tree)); */
+ tree = sib2(tree); goto tailcall;
+ default: assert(numsiblings[tree->tag] == 0); return 0;
+ }
+ }
+ }
+}
+
+
+/*
+** Checks how a pattern behaves regarding the empty string,
+** in one of two different ways:
+** A pattern is *nullable* if it can match without consuming any character;
+** A pattern is *nofail* if it never fails for any string
+** (including the empty string).
+** The difference is only for predicates and run-time captures;
+** for other patterns, the two properties are equivalent.
+** (With predicates, &'a' is nullable but not nofail. Of course,
+** nofail => nullable.)
+** These functions are all convervative in the following way:
+** p is nullable => nullable(p)
+** nofail(p) => p cannot fail
+** The function assumes that TOpenCall is not nullable;
+** this will be checked again when the grammar is fixed.
+** Run-time captures can do whatever they want, so the result
+** is conservative.
+*/
+int checkaux (TTree *tree, int pred) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny:
+ case TFalse: case TOpenCall:
+ return 0; /* not nullable */
+ case TRep: case TTrue:
+ return 1; /* no fail */
+ case TNot: case TBehind: /* can match empty, but can fail */
+ if (pred == PEnofail) return 0;
+ else return 1; /* PEnullable */
+ case TAnd: /* can match empty; fail iff body does */
+ if (pred == PEnullable) return 1;
+ /* else return checkaux(sib1(tree), pred); */
+ tree = sib1(tree); goto tailcall;
+ case TRunTime: /* can fail; match empty iff body does */
+ if (pred == PEnofail) return 0;
+ /* else return checkaux(sib1(tree), pred); */
+ tree = sib1(tree); goto tailcall;
+ case TSeq:
+ if (!checkaux(sib1(tree), pred)) return 0;
+ /* else return checkaux(sib2(tree), pred); */
+ tree = sib2(tree); goto tailcall;
+ case TChoice:
+ if (checkaux(sib2(tree), pred)) return 1;
+ /* else return checkaux(sib1(tree), pred); */
+ tree = sib1(tree); goto tailcall;
+ case TCapture: case TGrammar: case TRule:
+ /* return checkaux(sib1(tree), pred); */
+ tree = sib1(tree); goto tailcall;
+ case TCall: /* return checkaux(sib2(tree), pred); */
+ tree = sib2(tree); goto tailcall;
+ default: assert(0); return 0;
+ }
+}
+
+
+/*
+** number of characters to match a pattern (or -1 if variable)
+*/
+int fixedlen (TTree *tree) {
+ int len = 0; /* to accumulate in tail calls */
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny:
+ return len + 1;
+ case TFalse: case TTrue: case TNot: case TAnd: case TBehind:
+ return len;
+ case TRep: case TRunTime: case TOpenCall:
+ return -1;
+ case TCapture: case TRule: case TGrammar:
+ /* return fixedlen(sib1(tree)); */
+ tree = sib1(tree); goto tailcall;
+ case TCall: {
+ int n1 = callrecursive(tree, fixedlen, -1);
+ if (n1 < 0)
+ return -1;
+ else
+ return len + n1;
+ }
+ case TSeq: {
+ int n1 = fixedlen(sib1(tree));
+ if (n1 < 0)
+ return -1;
+ /* else return fixedlen(sib2(tree)) + len; */
+ len += n1; tree = sib2(tree); goto tailcall;
+ }
+ case TChoice: {
+ int n1 = fixedlen(sib1(tree));
+ int n2 = fixedlen(sib2(tree));
+ if (n1 != n2 || n1 < 0)
+ return -1;
+ else
+ return len + n1;
+ }
+ default: assert(0); return 0;
+ };
+}
+
+
+/*
+** Computes the 'first set' of a pattern.
+** The result is a conservative aproximation:
+** match p ax -> x (for some x) ==> a belongs to first(p)
+** or
+** a not in first(p) ==> match p ax -> fail (for all x)
+**
+** The set 'follow' is the first set of what follows the
+** pattern (full set if nothing follows it).
+**
+** The function returns 0 when this resulting set can be used for
+** test instructions that avoid the pattern altogether.
+** A non-zero return can happen for two reasons:
+** 1) match p '' -> '' ==> return has bit 1 set
+** (tests cannot be used because they would always fail for an empty input);
+** 2) there is a match-time capture ==> return has bit 2 set
+** (optimizations should not bypass match-time captures).
+*/
+static int getfirst (TTree *tree, const Charset *follow, Charset *firstset) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny: {
+ tocharset(tree, firstset);
+ return 0;
+ }
+ case TTrue: {
+ loopset(i, firstset->cs[i] = follow->cs[i]);
+ return 1; /* accepts the empty string */
+ }
+ case TFalse: {
+ loopset(i, firstset->cs[i] = 0);
+ return 0;
+ }
+ case TChoice: {
+ Charset csaux;
+ int e1 = getfirst(sib1(tree), follow, firstset);
+ int e2 = getfirst(sib2(tree), follow, &csaux);
+ loopset(i, firstset->cs[i] |= csaux.cs[i]);
+ return e1 | e2;
+ }
+ case TSeq: {
+ if (!nullable(sib1(tree))) {
+ /* when p1 is not nullable, p2 has nothing to contribute;
+ return getfirst(sib1(tree), fullset, firstset); */
+ tree = sib1(tree); follow = fullset; goto tailcall;
+ }
+ else { /* FIRST(p1 p2, fl) = FIRST(p1, FIRST(p2, fl)) */
+ Charset csaux;
+ int e2 = getfirst(sib2(tree), follow, &csaux);
+ int e1 = getfirst(sib1(tree), &csaux, firstset);
+ if (e1 == 0) return 0; /* 'e1' ensures that first can be used */
+ else if ((e1 | e2) & 2) /* one of the children has a matchtime? */
+ return 2; /* pattern has a matchtime capture */
+ else return e2; /* else depends on 'e2' */
+ }
+ }
+ case TRep: {
+ getfirst(sib1(tree), follow, firstset);
+ loopset(i, firstset->cs[i] |= follow->cs[i]);
+ return 1; /* accept the empty string */
+ }
+ case TCapture: case TGrammar: case TRule: {
+ /* return getfirst(sib1(tree), follow, firstset); */
+ tree = sib1(tree); goto tailcall;
+ }
+ case TRunTime: { /* function invalidates any follow info. */
+ int e = getfirst(sib1(tree), fullset, firstset);
+ if (e) return 2; /* function is not "protected"? */
+ else return 0; /* pattern inside capture ensures first can be used */
+ }
+ case TCall: {
+ /* return getfirst(sib2(tree), follow, firstset); */
+ tree = sib2(tree); goto tailcall;
+ }
+ case TAnd: {
+ int e = getfirst(sib1(tree), follow, firstset);
+ loopset(i, firstset->cs[i] &= follow->cs[i]);
+ return e;
+ }
+ case TNot: {
+ if (tocharset(sib1(tree), firstset)) {
+ cs_complement(firstset);
+ return 1;
+ }
+ /* else go through */
+ }
+ case TBehind: { /* instruction gives no new information */
+ /* call 'getfirst' only to check for math-time captures */
+ int e = getfirst(sib1(tree), follow, firstset);
+ loopset(i, firstset->cs[i] = follow->cs[i]); /* uses follow */
+ return e | 1; /* always can accept the empty string */
+ }
+ default: assert(0); return 0;
+ }
+}
+
+
+/*
+** If 'headfail(tree)' true, then 'tree' can fail only depending on the
+** next character of the subject.
+*/
+static int headfail (TTree *tree) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny: case TFalse:
+ return 1;
+ case TTrue: case TRep: case TRunTime: case TNot:
+ case TBehind:
+ return 0;
+ case TCapture: case TGrammar: case TRule: case TAnd:
+ tree = sib1(tree); goto tailcall; /* return headfail(sib1(tree)); */
+ case TCall:
+ tree = sib2(tree); goto tailcall; /* return headfail(sib2(tree)); */
+ case TSeq:
+ if (!nofail(sib2(tree))) return 0;
+ /* else return headfail(sib1(tree)); */
+ tree = sib1(tree); goto tailcall;
+ case TChoice:
+ if (!headfail(sib1(tree))) return 0;
+ /* else return headfail(sib2(tree)); */
+ tree = sib2(tree); goto tailcall;
+ default: assert(0); return 0;
+ }
+}
+
+
+/*
+** Check whether the code generation for the given tree can benefit
+** from a follow set (to avoid computing the follow set when it is
+** not needed)
+*/
+static int needfollow (TTree *tree) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny:
+ case TFalse: case TTrue: case TAnd: case TNot:
+ case TRunTime: case TGrammar: case TCall: case TBehind:
+ return 0;
+ case TChoice: case TRep:
+ return 1;
+ case TCapture:
+ tree = sib1(tree); goto tailcall;
+ case TSeq:
+ tree = sib2(tree); goto tailcall;
+ default: assert(0); return 0;
+ }
+}
+
+/* }====================================================== */
+
+
+
+/*
+** {======================================================
+** Code generation
+** =======================================================
+*/
+
+
+/*
+** size of an instruction
+*/
+int sizei (const Instruction *i) {
+ switch((Opcode)i->i.code) {
+ case ISet: case ISpan: return CHARSETINSTSIZE;
+ case ITestSet: return CHARSETINSTSIZE + 1;
+ case ITestChar: case ITestAny: case IChoice: case IJmp: case ICall:
+ case IOpenCall: case ICommit: case IPartialCommit: case IBackCommit:
+ return 2;
+ default: return 1;
+ }
+}
+
+
+/*
+** state for the compiler
+*/
+typedef struct CompileState {
+ Pattern *p; /* pattern being compiled */
+ int ncode; /* next position in p->code to be filled */
+ lua_State *L;
+} CompileState;
+
+
+/*
+** code generation is recursive; 'opt' indicates that the code is being
+** generated as the last thing inside an optional pattern (so, if that
+** code is optional too, it can reuse the 'IChoice' already in place for
+** the outer pattern). 'tt' points to a previous test protecting this
+** code (or NOINST). 'fl' is the follow set of the pattern.
+*/
+static void codegen (CompileState *compst, TTree *tree, int opt, int tt,
+ const Charset *fl);
+
+
+void realloccode (lua_State *L, Pattern *p, int nsize) {
+ void *ud;
+ lua_Alloc f = lua_getallocf(L, &ud);
+ void *newblock = f(ud, p->code, p->codesize * sizeof(Instruction),
+ nsize * sizeof(Instruction));
+ if (newblock == NULL && nsize > 0)
+ luaL_error(L, "not enough memory");
+ p->code = (Instruction *)newblock;
+ p->codesize = nsize;
+}
+
+
+static int nextinstruction (CompileState *compst) {
+ int size = compst->p->codesize;
+ if (compst->ncode >= size)
+ realloccode(compst->L, compst->p, size * 2);
+ return compst->ncode++;
+}
+
+
+#define getinstr(cs,i) ((cs)->p->code[i])
+
+
+static int addinstruction (CompileState *compst, Opcode op, int aux) {
+ int i = nextinstruction(compst);
+ getinstr(compst, i).i.code = op;
+ getinstr(compst, i).i.aux = aux;
+ return i;
+}
+
+
+/*
+** Add an instruction followed by space for an offset (to be set later)
+*/
+static int addoffsetinst (CompileState *compst, Opcode op) {
+ int i = addinstruction(compst, op, 0); /* instruction */
+ addinstruction(compst, (Opcode)0, 0); /* open space for offset */
+ assert(op == ITestSet || sizei(&getinstr(compst, i)) == 2);
+ return i;
+}
+
+
+/*
+** Set the offset of an instruction
+*/
+static void setoffset (CompileState *compst, int instruction, int offset) {
+ getinstr(compst, instruction + 1).offset = offset;
+}
+
+
+/*
+** Add a capture instruction:
+** 'op' is the capture instruction; 'cap' the capture kind;
+** 'key' the key into ktable; 'aux' is the optional capture offset
+**
+*/
+static int addinstcap (CompileState *compst, Opcode op, int cap, int key,
+ int aux) {
+ int i = addinstruction(compst, op, joinkindoff(cap, aux));
+ getinstr(compst, i).i.key = key;
+ return i;
+}
+
+
+#define gethere(compst) ((compst)->ncode)
+
+#define target(code,i) ((i) + code[i + 1].offset)
+
+
+/*
+** Patch 'instruction' to jump to 'target'
+*/
+static void jumptothere (CompileState *compst, int instruction, int target) {
+ if (instruction >= 0)
+ setoffset(compst, instruction, target - instruction);
+}
+
+
+/*
+** Patch 'instruction' to jump to current position
+*/
+static void jumptohere (CompileState *compst, int instruction) {
+ jumptothere(compst, instruction, gethere(compst));
+}
+
+
+/*
+** Code an IChar instruction, or IAny if there is an equivalent
+** test dominating it
+*/
+static void codechar (CompileState *compst, int c, int tt) {
+ if (tt >= 0 && getinstr(compst, tt).i.code == ITestChar &&
+ getinstr(compst, tt).i.aux == c)
+ addinstruction(compst, IAny, 0);
+ else
+ addinstruction(compst, IChar, c);
+}
+
+
+/*
+** Add a charset posfix to an instruction
+*/
+static void addcharset (CompileState *compst, const byte *cs) {
+ int p = gethere(compst);
+ int i;
+ for (i = 0; i < (int)CHARSETINSTSIZE - 1; i++)
+ nextinstruction(compst); /* space for buffer */
+ /* fill buffer with charset */
+ loopset(j, getinstr(compst, p).buff[j] = cs[j]);
+}
+
+
+/*
+** code a char set, optimizing unit sets for IChar, "complete"
+** sets for IAny, and empty sets for IFail; also use an IAny
+** when instruction is dominated by an equivalent test.
+*/
+static void codecharset (CompileState *compst, const byte *cs, int tt) {
+ int c = 0; /* (=) to avoid warnings */
+ Opcode op = charsettype(cs, &c);
+ switch (op) {
+ case IChar: codechar(compst, c, tt); break;
+ case ISet: { /* non-trivial set? */
+ if (tt >= 0 && getinstr(compst, tt).i.code == ITestSet &&
+ cs_equal(cs, getinstr(compst, tt + 2).buff))
+ addinstruction(compst, IAny, 0);
+ else {
+ addinstruction(compst, ISet, 0);
+ addcharset(compst, cs);
+ }
+ break;
+ }
+ default: addinstruction(compst, op, c); break;
+ }
+}
+
+
+/*
+** code a test set, optimizing unit sets for ITestChar, "complete"
+** sets for ITestAny, and empty sets for IJmp (always fails).
+** 'e' is true iff test should accept the empty string. (Test
+** instructions in the current VM never accept the empty string.)
+*/
+static int codetestset (CompileState *compst, Charset *cs, int e) {
+ if (e) return NOINST; /* no test */
+ else {
+ int c = 0;
+ Opcode op = charsettype(cs->cs, &c);
+ switch (op) {
+ case IFail: return addoffsetinst(compst, IJmp); /* always jump */
+ case IAny: return addoffsetinst(compst, ITestAny);
+ case IChar: {
+ int i = addoffsetinst(compst, ITestChar);
+ getinstr(compst, i).i.aux = c;
+ return i;
+ }
+ case ISet: {
+ int i = addoffsetinst(compst, ITestSet);
+ addcharset(compst, cs->cs);
+ return i;
+ }
+ default: assert(0); return 0;
+ }
+ }
+}
+
+
+/*
+** Find the final destination of a sequence of jumps
+*/
+static int finaltarget (Instruction *code, int i) {
+ while (code[i].i.code == IJmp)
+ i = target(code, i);
+ return i;
+}
+
+
+/*
+** final label (after traversing any jumps)
+*/
+static int finallabel (Instruction *code, int i) {
+ return finaltarget(code, target(code, i));
+}
+
+
+/*
+** <behind(p)> == behind n; <p> (where n = fixedlen(p))
+*/
+static void codebehind (CompileState *compst, TTree *tree) {
+ if (tree->u.n > 0)
+ addinstruction(compst, IBehind, tree->u.n);
+ codegen(compst, sib1(tree), 0, NOINST, fullset);
+}
+
+
+/*
+** Choice; optimizations:
+** - when p1 is headfail or
+** when first(p1) and first(p2) are disjoint, than
+** a character not in first(p1) cannot go to p1, and a character
+** in first(p1) cannot go to p2 (at it is not in first(p2)).
+** (The optimization is not valid if p1 accepts the empty string,
+** as then there is no character at all...)
+** - when p2 is empty and opt is true; a IPartialCommit can reuse
+** the Choice already active in the stack.
+*/
+static void codechoice (CompileState *compst, TTree *p1, TTree *p2, int opt,
+ const Charset *fl) {
+ int emptyp2 = (p2->tag == TTrue);
+ Charset cs1, cs2;
+ int e1 = getfirst(p1, fullset, &cs1);
+ if (headfail(p1) ||
+ (!e1 && (getfirst(p2, fl, &cs2), cs_disjoint(&cs1, &cs2)))) {
+ /* <p1 / p2> == test (fail(p1)) -> L1 ; p1 ; jmp L2; L1: p2; L2: */
+ int test = codetestset(compst, &cs1, 0);
+ int jmp = NOINST;
+ codegen(compst, p1, 0, test, fl);
+ if (!emptyp2)
+ jmp = addoffsetinst(compst, IJmp);
+ jumptohere(compst, test);
+ codegen(compst, p2, opt, NOINST, fl);
+ jumptohere(compst, jmp);
+ }
+ else if (opt && emptyp2) {
+ /* p1? == IPartialCommit; p1 */
+ jumptohere(compst, addoffsetinst(compst, IPartialCommit));
+ codegen(compst, p1, 1, NOINST, fullset);
+ }
+ else {
+ /* <p1 / p2> ==
+ test(first(p1)) -> L1; choice L1; <p1>; commit L2; L1: <p2>; L2: */
+ int pcommit;
+ int test = codetestset(compst, &cs1, e1);
+ int pchoice = addoffsetinst(compst, IChoice);
+ codegen(compst, p1, emptyp2, test, fullset);
+ pcommit = addoffsetinst(compst, ICommit);
+ jumptohere(compst, pchoice);
+ jumptohere(compst, test);
+ codegen(compst, p2, opt, NOINST, fl);
+ jumptohere(compst, pcommit);
+ }
+}
+
+
+/*
+** And predicate
+** optimization: fixedlen(p) = n ==> <&p> == <p>; behind n
+** (valid only when 'p' has no captures)
+*/
+static void codeand (CompileState *compst, TTree *tree, int tt) {
+ int n = fixedlen(tree);
+ if (n >= 0 && n <= MAXBEHIND && !hascaptures(tree)) {
+ codegen(compst, tree, 0, tt, fullset);
+ if (n > 0)
+ addinstruction(compst, IBehind, n);
+ }
+ else { /* default: Choice L1; p1; BackCommit L2; L1: Fail; L2: */
+ int pcommit;
+ int pchoice = addoffsetinst(compst, IChoice);
+ codegen(compst, tree, 0, tt, fullset);
+ pcommit = addoffsetinst(compst, IBackCommit);
+ jumptohere(compst, pchoice);
+ addinstruction(compst, IFail, 0);
+ jumptohere(compst, pcommit);
+ }
+}
+
+
+/*
+** Captures: if pattern has fixed (and not too big) length, and it
+** has no nested captures, use a single IFullCapture instruction
+** after the match; otherwise, enclose the pattern with OpenCapture -
+** CloseCapture.
+*/
+static void codecapture (CompileState *compst, TTree *tree, int tt,
+ const Charset *fl) {
+ int len = fixedlen(sib1(tree));
+ if (len >= 0 && len <= MAXOFF && !hascaptures(sib1(tree))) {
+ codegen(compst, sib1(tree), 0, tt, fl);
+ addinstcap(compst, IFullCapture, tree->cap, tree->key, len);
+ }
+ else {
+ addinstcap(compst, IOpenCapture, tree->cap, tree->key, 0);
+ codegen(compst, sib1(tree), 0, tt, fl);
+ addinstcap(compst, ICloseCapture, Cclose, 0, 0);
+ }
+}
+
+
+static void coderuntime (CompileState *compst, TTree *tree, int tt) {
+ addinstcap(compst, IOpenCapture, Cgroup, tree->key, 0);
+ codegen(compst, sib1(tree), 0, tt, fullset);
+ addinstcap(compst, ICloseRunTime, Cclose, 0, 0);
+}
+
+
+/*
+** Repetion; optimizations:
+** When pattern is a charset, can use special instruction ISpan.
+** When pattern is head fail, or if it starts with characters that
+** are disjoint from what follows the repetions, a simple test
+** is enough (a fail inside the repetition would backtrack to fail
+** again in the following pattern, so there is no need for a choice).
+** When 'opt' is true, the repetion can reuse the Choice already
+** active in the stack.
+*/
+static void coderep (CompileState *compst, TTree *tree, int opt,
+ const Charset *fl) {
+ Charset st;
+ if (tocharset(tree, &st)) {
+ addinstruction(compst, ISpan, 0);
+ addcharset(compst, st.cs);
+ }
+ else {
+ int e1 = getfirst(tree, fullset, &st);
+ if (headfail(tree) || (!e1 && cs_disjoint(&st, fl))) {
+ /* L1: test (fail(p1)) -> L2; <p>; jmp L1; L2: */
+ int jmp;
+ int test = codetestset(compst, &st, 0);
+ codegen(compst, tree, 0, test, fullset);
+ jmp = addoffsetinst(compst, IJmp);
+ jumptohere(compst, test);
+ jumptothere(compst, jmp, test);
+ }
+ else {
+ /* test(fail(p1)) -> L2; choice L2; L1: <p>; partialcommit L1; L2: */
+ /* or (if 'opt'): partialcommit L1; L1: <p>; partialcommit L1; */
+ int commit, l2;
+ int test = codetestset(compst, &st, e1);
+ int pchoice = NOINST;
+ if (opt)
+ jumptohere(compst, addoffsetinst(compst, IPartialCommit));
+ else
+ pchoice = addoffsetinst(compst, IChoice);
+ l2 = gethere(compst);
+ codegen(compst, tree, 0, NOINST, fullset);
+ commit = addoffsetinst(compst, IPartialCommit);
+ jumptothere(compst, commit, l2);
+ jumptohere(compst, pchoice);
+ jumptohere(compst, test);
+ }
+ }
+}
+
+
+/*
+** Not predicate; optimizations:
+** In any case, if first test fails, 'not' succeeds, so it can jump to
+** the end. If pattern is headfail, that is all (it cannot fail
+** in other parts); this case includes 'not' of simple sets. Otherwise,
+** use the default code (a choice plus a failtwice).
+*/
+static void codenot (CompileState *compst, TTree *tree) {
+ Charset st;
+ int e = getfirst(tree, fullset, &st);
+ int test = codetestset(compst, &st, e);
+ if (headfail(tree)) /* test (fail(p1)) -> L1; fail; L1: */
+ addinstruction(compst, IFail, 0);
+ else {
+ /* test(fail(p))-> L1; choice L1; <p>; failtwice; L1: */
+ int pchoice = addoffsetinst(compst, IChoice);
+ codegen(compst, tree, 0, NOINST, fullset);
+ addinstruction(compst, IFailTwice, 0);
+ jumptohere(compst, pchoice);
+ }
+ jumptohere(compst, test);
+}
+
+
+/*
+** change open calls to calls, using list 'positions' to find
+** correct offsets; also optimize tail calls
+*/
+static void correctcalls (CompileState *compst, int *positions,
+ int from, int to) {
+ int i;
+ Instruction *code = compst->p->code;
+ for (i = from; i < to; i += sizei(&code[i])) {
+ if (code[i].i.code == IOpenCall) {
+ int n = code[i].i.key; /* rule number */
+ int rule = positions[n]; /* rule position */
+ assert(rule == from || code[rule - 1].i.code == IRet);
+ if (code[finaltarget(code, i + 2)].i.code == IRet) /* call; ret ? */
+ code[i].i.code = IJmp; /* tail call */
+ else
+ code[i].i.code = ICall;
+ jumptothere(compst, i, rule); /* call jumps to respective rule */
+ }
+ }
+ assert(i == to);
+}
+
+
+/*
+** Code for a grammar:
+** call L1; jmp L2; L1: rule 1; ret; rule 2; ret; ...; L2:
+*/
+static void codegrammar (CompileState *compst, TTree *grammar) {
+ int positions[MAXRULES];
+ int rulenumber = 0;
+ TTree *rule;
+ int firstcall = addoffsetinst(compst, ICall); /* call initial rule */
+ int jumptoend = addoffsetinst(compst, IJmp); /* jump to the end */
+ int start = gethere(compst); /* here starts the initial rule */
+ jumptohere(compst, firstcall);
+ for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) {
+ positions[rulenumber++] = gethere(compst); /* save rule position */
+ codegen(compst, sib1(rule), 0, NOINST, fullset); /* code rule */
+ addinstruction(compst, IRet, 0);
+ }
+ assert(rule->tag == TTrue);
+ jumptohere(compst, jumptoend);
+ correctcalls(compst, positions, start, gethere(compst));
+}
+
+
+static void codecall (CompileState *compst, TTree *call) {
+ int c = addoffsetinst(compst, IOpenCall); /* to be corrected later */
+ getinstr(compst, c).i.key = sib2(call)->cap; /* rule number */
+ assert(sib2(call)->tag == TRule);
+}
+
+
+/*
+** Code first child of a sequence
+** (second child is called in-place to allow tail call)
+** Return 'tt' for second child
+*/
+static int codeseq1 (CompileState *compst, TTree *p1, TTree *p2,
+ int tt, const Charset *fl) {
+ if (needfollow(p1)) {
+ Charset fl1;
+ getfirst(p2, fl, &fl1); /* p1 follow is p2 first */
+ codegen(compst, p1, 0, tt, &fl1);
+ }
+ else /* use 'fullset' as follow */
+ codegen(compst, p1, 0, tt, fullset);
+ if (fixedlen(p1) != 0) /* can 'p1' consume anything? */
+ return NOINST; /* invalidate test */
+ else return tt; /* else 'tt' still protects sib2 */
+}
+
+
+/*
+** Main code-generation function: dispatch to auxiliar functions
+** according to kind of tree. ('needfollow' should return true
+** only for consructions that use 'fl'.)
+*/
+static void codegen (CompileState *compst, TTree *tree, int opt, int tt,
+ const Charset *fl) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: codechar(compst, tree->u.n, tt); break;
+ case TAny: addinstruction(compst, IAny, 0); break;
+ case TSet: codecharset(compst, treebuffer(tree), tt); break;
+ case TTrue: break;
+ case TFalse: addinstruction(compst, IFail, 0); break;
+ case TChoice: codechoice(compst, sib1(tree), sib2(tree), opt, fl); break;
+ case TRep: coderep(compst, sib1(tree), opt, fl); break;
+ case TBehind: codebehind(compst, tree); break;
+ case TNot: codenot(compst, sib1(tree)); break;
+ case TAnd: codeand(compst, sib1(tree), tt); break;
+ case TCapture: codecapture(compst, tree, tt, fl); break;
+ case TRunTime: coderuntime(compst, tree, tt); break;
+ case TGrammar: codegrammar(compst, tree); break;
+ case TCall: codecall(compst, tree); break;
+ case TSeq: {
+ tt = codeseq1(compst, sib1(tree), sib2(tree), tt, fl); /* code 'p1' */
+ /* codegen(compst, p2, opt, tt, fl); */
+ tree = sib2(tree); goto tailcall;
+ }
+ default: assert(0);
+ }
+}
+
+
+/*
+** Optimize jumps and other jump-like instructions.
+** * Update labels of instructions with labels to their final
+** destinations (e.g., choice L1; ... L1: jmp L2: becomes
+** choice L2)
+** * Jumps to other instructions that do jumps become those
+** instructions (e.g., jump to return becomes a return; jump
+** to commit becomes a commit)
+*/
+static void peephole (CompileState *compst) {
+ Instruction *code = compst->p->code;
+ int i;
+ for (i = 0; i < compst->ncode; i += sizei(&code[i])) {
+ redo:
+ switch (code[i].i.code) {
+ case IChoice: case ICall: case ICommit: case IPartialCommit:
+ case IBackCommit: case ITestChar: case ITestSet:
+ case ITestAny: { /* instructions with labels */
+ jumptothere(compst, i, finallabel(code, i)); /* optimize label */
+ break;
+ }
+ case IJmp: {
+ int ft = finaltarget(code, i);
+ switch (code[ft].i.code) { /* jumping to what? */
+ case IRet: case IFail: case IFailTwice:
+ case IEnd: { /* instructions with unconditional implicit jumps */
+ code[i] = code[ft]; /* jump becomes that instruction */
+ code[i + 1].i.code = IAny; /* 'no-op' for target position */
+ break;
+ }
+ case ICommit: case IPartialCommit:
+ case IBackCommit: { /* inst. with unconditional explicit jumps */
+ int fft = finallabel(code, ft);
+ code[i] = code[ft]; /* jump becomes that instruction... */
+ jumptothere(compst, i, fft); /* but must correct its offset */
+ goto redo; /* reoptimize its label */
+ }
+ default: {
+ jumptothere(compst, i, ft); /* optimize label */
+ break;
+ }
+ }
+ break;
+ }
+ default: break;
+ }
+ }
+ assert(code[i - 1].i.code == IEnd);
+}
+
+
+/*
+** Compile a pattern
+*/
+Instruction *compile (lua_State *L, Pattern *p) {
+ CompileState compst;
+ compst.p = p; compst.ncode = 0; compst.L = L;
+ realloccode(L, p, 2); /* minimum initial size */
+ codegen(&compst, p->tree, 0, NOINST, fullset);
+ addinstruction(&compst, IEnd, 0);
+ realloccode(L, p, compst.ncode); /* set final size */
+ peephole(&compst);
+ return p->code;
+}
+
+
+/* }====================================================== */
+
diff --git a/contrib/lua-lpeg/lpcode.h b/contrib/lua-lpeg/lpcode.h
new file mode 100644
index 0000000..34ee276
--- /dev/null
+++ b/contrib/lua-lpeg/lpcode.h
@@ -0,0 +1,40 @@
+/*
+** $Id: lpcode.h $
+*/
+
+#if !defined(lpcode_h)
+#define lpcode_h
+
+#include "lua.h"
+
+#include "lptypes.h"
+#include "lptree.h"
+#include "lpvm.h"
+
+int tocharset (TTree *tree, Charset *cs);
+int checkaux (TTree *tree, int pred);
+int fixedlen (TTree *tree);
+int hascaptures (TTree *tree);
+int lp_gc (lua_State *L);
+Instruction *compile (lua_State *L, Pattern *p);
+void realloccode (lua_State *L, Pattern *p, int nsize);
+int sizei (const Instruction *i);
+
+
+#define PEnullable 0
+#define PEnofail 1
+
+/*
+** nofail(t) implies that 't' cannot fail with any input
+*/
+#define nofail(t) checkaux(t, PEnofail)
+
+/*
+** (not nullable(t)) implies 't' cannot match without consuming
+** something
+*/
+#define nullable(t) checkaux(t, PEnullable)
+
+
+
+#endif
diff --git a/contrib/lua-lpeg/lpegre.lua b/contrib/lua-lpeg/lpegre.lua
new file mode 100644
index 0000000..3bb8af7
--- /dev/null
+++ b/contrib/lua-lpeg/lpegre.lua
@@ -0,0 +1,267 @@
+-- $Id: re.lua $
+
+-- imported functions and modules
+local tonumber, type, print, error = tonumber, type, print, error
+local setmetatable = setmetatable
+local m = require"lpeg"
+
+-- 'm' will be used to parse expressions, and 'mm' will be used to
+-- create expressions; that is, 're' runs on 'm', creating patterns
+-- on 'mm'
+local mm = m
+
+-- pattern's metatable
+local mt = getmetatable(mm.P(0))
+
+
+
+-- No more global accesses after this point
+local version = _VERSION
+if version == "Lua 5.2" then _ENV = nil end
+
+
+local any = m.P(1)
+
+
+-- Pre-defined names
+local Predef = { nl = m.P"\n" }
+
+
+local mem
+local fmem
+local gmem
+
+
+local function updatelocale ()
+ mm.locale(Predef)
+ Predef.a = Predef.alpha
+ Predef.c = Predef.cntrl
+ Predef.d = Predef.digit
+ Predef.g = Predef.graph
+ Predef.l = Predef.lower
+ Predef.p = Predef.punct
+ Predef.s = Predef.space
+ Predef.u = Predef.upper
+ Predef.w = Predef.alnum
+ Predef.x = Predef.xdigit
+ Predef.A = any - Predef.a
+ Predef.C = any - Predef.c
+ Predef.D = any - Predef.d
+ Predef.G = any - Predef.g
+ Predef.L = any - Predef.l
+ Predef.P = any - Predef.p
+ Predef.S = any - Predef.s
+ Predef.U = any - Predef.u
+ Predef.W = any - Predef.w
+ Predef.X = any - Predef.x
+ mem = {} -- restart memoization
+ fmem = {}
+ gmem = {}
+ local mt = {__mode = "v"}
+ setmetatable(mem, mt)
+ setmetatable(fmem, mt)
+ setmetatable(gmem, mt)
+end
+
+
+updatelocale()
+
+
+
+local I = m.P(function (s,i) print(i, s:sub(1, i-1)); return i end)
+
+
+local function patt_error (s, i)
+ local msg = (#s < i + 20) and s:sub(i)
+ or s:sub(i,i+20) .. "..."
+ msg = ("pattern error near '%s'"):format(msg)
+ error(msg, 2)
+end
+
+local function mult (p, n)
+ local np = mm.P(true)
+ while n >= 1 do
+ if n%2 >= 1 then np = np * p end
+ p = p * p
+ n = n/2
+ end
+ return np
+end
+
+local function equalcap (s, i, c)
+ if type(c) ~= "string" then return nil end
+ local e = #c + i
+ if s:sub(i, e - 1) == c then return e else return nil end
+end
+
+
+local S = (Predef.space + "--" * (any - Predef.nl)^0)^0
+
+local name = m.R("AZ", "az", "__") * m.R("AZ", "az", "__", "09")^0
+
+local arrow = S * "<-"
+
+local seq_follow = m.P"/" + ")" + "}" + ":}" + "~}" + "|}" + (name * arrow) + -1
+
+name = m.C(name)
+
+
+-- a defined name only have meaning in a given environment
+local Def = name * m.Carg(1)
+
+
+local function getdef (id, defs)
+ local c = defs and defs[id]
+ if not c then error("undefined name: " .. id) end
+ return c
+end
+
+-- match a name and return a group of its corresponding definition
+-- and 'f' (to be folded in 'Suffix')
+local function defwithfunc (f)
+ return m.Cg(Def / getdef * m.Cc(f))
+end
+
+
+local num = m.C(m.R"09"^1) * S / tonumber
+
+local String = "'" * m.C((any - "'")^0) * "'" +
+ '"' * m.C((any - '"')^0) * '"'
+
+
+local defined = "%" * Def / function (c,Defs)
+ local cat = Defs and Defs[c] or Predef[c]
+ if not cat then error ("name '" .. c .. "' undefined") end
+ return cat
+end
+
+local Range = m.Cs(any * (m.P"-"/"") * (any - "]")) / mm.R
+
+local item = (defined + Range + m.C(any)) / m.P
+
+local Class =
+ "["
+ * (m.C(m.P"^"^-1)) -- optional complement symbol
+ * m.Cf(item * (item - "]")^0, mt.__add) /
+ function (c, p) return c == "^" and any - p or p end
+ * "]"
+
+local function adddef (t, k, exp)
+ if t[k] then
+ error("'"..k.."' already defined as a rule")
+ else
+ t[k] = exp
+ end
+ return t
+end
+
+local function firstdef (n, r) return adddef({n}, n, r) end
+
+
+local function NT (n, b)
+ if not b then
+ error("rule '"..n.."' used outside a grammar")
+ else return mm.V(n)
+ end
+end
+
+
+local exp = m.P{ "Exp",
+ Exp = S * ( m.V"Grammar"
+ + m.Cf(m.V"Seq" * ("/" * S * m.V"Seq")^0, mt.__add) );
+ Seq = m.Cf(m.Cc(m.P"") * m.V"Prefix"^0 , mt.__mul)
+ * (#seq_follow + patt_error);
+ Prefix = "&" * S * m.V"Prefix" / mt.__len
+ + "!" * S * m.V"Prefix" / mt.__unm
+ + m.V"Suffix";
+ Suffix = m.Cf(m.V"Primary" * S *
+ ( ( m.P"+" * m.Cc(1, mt.__pow)
+ + m.P"*" * m.Cc(0, mt.__pow)
+ + m.P"?" * m.Cc(-1, mt.__pow)
+ + "^" * ( m.Cg(num * m.Cc(mult))
+ + m.Cg(m.C(m.S"+-" * m.R"09"^1) * m.Cc(mt.__pow))
+ )
+ + "->" * S * ( m.Cg((String + num) * m.Cc(mt.__div))
+ + m.P"{}" * m.Cc(nil, m.Ct)
+ + defwithfunc(mt.__div)
+ )
+ + "=>" * S * defwithfunc(m.Cmt)
+ + "~>" * S * defwithfunc(m.Cf)
+ ) * S
+ )^0, function (a,b,f) return f(a,b) end );
+ Primary = "(" * m.V"Exp" * ")"
+ + String / mm.P
+ + Class
+ + defined
+ + "{:" * (name * ":" + m.Cc(nil)) * m.V"Exp" * ":}" /
+ function (n, p) return mm.Cg(p, n) end
+ + "=" * name / function (n) return mm.Cmt(mm.Cb(n), equalcap) end
+ + m.P"{}" / mm.Cp
+ + "{~" * m.V"Exp" * "~}" / mm.Cs
+ + "{|" * m.V"Exp" * "|}" / mm.Ct
+ + "{" * m.V"Exp" * "}" / mm.C
+ + m.P"." * m.Cc(any)
+ + (name * -arrow + "<" * name * ">") * m.Cb("G") / NT;
+ Definition = name * arrow * m.V"Exp";
+ Grammar = m.Cg(m.Cc(true), "G") *
+ m.Cf(m.V"Definition" / firstdef * m.Cg(m.V"Definition")^0,
+ adddef) / mm.P
+}
+
+local pattern = S * m.Cg(m.Cc(false), "G") * exp / mm.P * (-any + patt_error)
+
+
+local function compile (p, defs)
+ if mm.type(p) == "pattern" then return p end -- already compiled
+ local cp = pattern:match(p, 1, defs)
+ if not cp then error("incorrect pattern", 3) end
+ return cp
+end
+
+local function match (s, p, i)
+ local cp = mem[p]
+ if not cp then
+ cp = compile(p)
+ mem[p] = cp
+ end
+ return cp:match(s, i or 1)
+end
+
+local function find (s, p, i)
+ local cp = fmem[p]
+ if not cp then
+ cp = compile(p) / 0
+ cp = mm.P{ mm.Cp() * cp * mm.Cp() + 1 * mm.V(1) }
+ fmem[p] = cp
+ end
+ local i, e = cp:match(s, i or 1)
+ if i then return i, e - 1
+ else return i
+ end
+end
+
+local function gsub (s, p, rep)
+ local g = gmem[p] or {} -- ensure gmem[p] is not collected while here
+ gmem[p] = g
+ local cp = g[rep]
+ if not cp then
+ cp = compile(p)
+ cp = mm.Cs((cp / rep + 1)^0)
+ g[rep] = cp
+ end
+ return cp:match(s)
+end
+
+
+-- exported names
+local re = {
+ compile = compile,
+ match = match,
+ find = find,
+ gsub = gsub,
+ updatelocale = updatelocale,
+}
+
+if version == "Lua 5.1" then _G.re = re end
+
+return re
diff --git a/contrib/lua-lpeg/lpprint.c b/contrib/lua-lpeg/lpprint.c
new file mode 100644
index 0000000..174d168
--- /dev/null
+++ b/contrib/lua-lpeg/lpprint.c
@@ -0,0 +1,244 @@
+/*
+** $Id: lpprint.c,v 1.9 2015/06/15 16:09:57 roberto Exp $
+** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+*/
+
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+
+
+#include "lptypes.h"
+#include "lpprint.h"
+#include "lpcode.h"
+
+
+#if defined(LPEG_DEBUG)
+
+/*
+** {======================================================
+** Printing patterns (for debugging)
+** =======================================================
+*/
+
+
+void printcharset (const byte *st) {
+ int i;
+ printf("[");
+ for (i = 0; i <= UCHAR_MAX; i++) {
+ int first = i;
+ while (testchar(st, i) && i <= UCHAR_MAX) i++;
+ if (i - 1 == first) /* unary range? */
+ printf("(%02x)", first);
+ else if (i - 1 > first) /* non-empty range? */
+ printf("(%02x-%02x)", first, i - 1);
+ }
+ printf("]");
+}
+
+
+static void printcapkind (int kind) {
+ const char *const modes[] = {
+ "close", "position", "constant", "backref",
+ "argument", "simple", "table", "function",
+ "query", "string", "num", "substitution", "fold",
+ "runtime", "group"};
+ printf("%s", modes[kind]);
+}
+
+
+static void printjmp (const Instruction *op, const Instruction *p) {
+ printf("-> %d", (int)(p + (p + 1)->offset - op));
+}
+
+
+void printinst (const Instruction *op, const Instruction *p) {
+ const char *const names[] = {
+ "any", "char", "set",
+ "testany", "testchar", "testset",
+ "span", "behind",
+ "ret", "end",
+ "choice", "jmp", "call", "open_call",
+ "commit", "partial_commit", "back_commit", "failtwice", "fail", "giveup",
+ "fullcapture", "opencapture", "closecapture", "closeruntime"
+ };
+ printf("%02ld: %s ", (long)(p - op), names[p->i.code]);
+ switch ((Opcode)p->i.code) {
+ case IChar: {
+ printf("'%c'", p->i.aux);
+ break;
+ }
+ case ITestChar: {
+ printf("'%c'", p->i.aux); printjmp(op, p);
+ break;
+ }
+ case IFullCapture: {
+ printcapkind(getkind(p));
+ printf(" (size = %d) (idx = %d)", getoff(p), p->i.key);
+ break;
+ }
+ case IOpenCapture: {
+ printcapkind(getkind(p));
+ printf(" (idx = %d)", p->i.key);
+ break;
+ }
+ case ISet: {
+ printcharset((p+1)->buff);
+ break;
+ }
+ case ITestSet: {
+ printcharset((p+2)->buff); printjmp(op, p);
+ break;
+ }
+ case ISpan: {
+ printcharset((p+1)->buff);
+ break;
+ }
+ case IOpenCall: {
+ printf("-> %d", (p + 1)->offset);
+ break;
+ }
+ case IBehind: {
+ printf("%d", p->i.aux);
+ break;
+ }
+ case IJmp: case ICall: case ICommit: case IChoice:
+ case IPartialCommit: case IBackCommit: case ITestAny: {
+ printjmp(op, p);
+ break;
+ }
+ default: break;
+ }
+ printf("\n");
+}
+
+
+void printpatt (Instruction *p, int n) {
+ Instruction *op = p;
+ while (p < op + n) {
+ printinst(op, p);
+ p += sizei(p);
+ }
+}
+
+
+#if defined(LPEG_DEBUG)
+static void printcap (Capture *cap) {
+ printcapkind(cap->kind);
+ printf(" (idx: %d - size: %d) -> %p\n", cap->idx, cap->siz, cap->s);
+}
+
+
+void printcaplist (Capture *cap, Capture *limit) {
+ printf(">======\n");
+ for (; cap->s && (limit == NULL || cap < limit); cap++)
+ printcap(cap);
+ printf("=======\n");
+}
+#endif
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Printing trees (for debugging)
+** =======================================================
+*/
+
+static const char *tagnames[] = {
+ "char", "set", "any",
+ "true", "false",
+ "rep",
+ "seq", "choice",
+ "not", "and",
+ "call", "opencall", "rule", "grammar",
+ "behind",
+ "capture", "run-time"
+};
+
+
+void printtree (TTree *tree, int ident) {
+ int i;
+ for (i = 0; i < ident; i++) printf(" ");
+ printf("%s", tagnames[tree->tag]);
+ switch (tree->tag) {
+ case TChar: {
+ int c = tree->u.n;
+ if (isprint(c))
+ printf(" '%c'\n", c);
+ else
+ printf(" (%02X)\n", c);
+ break;
+ }
+ case TSet: {
+ printcharset(treebuffer(tree));
+ printf("\n");
+ break;
+ }
+ case TOpenCall: case TCall: {
+ printf(" key: %d\n", tree->key);
+ break;
+ }
+ case TBehind: {
+ printf(" %d\n", tree->u.n);
+ printtree(sib1(tree), ident + 2);
+ break;
+ }
+ case TCapture: {
+ printf(" cap: %d key: %d n: %d\n", tree->cap, tree->key, tree->u.n);
+ printtree(sib1(tree), ident + 2);
+ break;
+ }
+ case TRule: {
+ printf(" n: %d key: %d\n", tree->cap, tree->key);
+ printtree(sib1(tree), ident + 2);
+ break; /* do not print next rule as a sibling */
+ }
+ case TGrammar: {
+ TTree *rule = sib1(tree);
+ printf(" %d\n", tree->u.n); /* number of rules */
+ for (i = 0; i < tree->u.n; i++) {
+ printtree(rule, ident + 2);
+ rule = sib2(rule);
+ }
+ assert(rule->tag == TTrue); /* sentinel */
+ break;
+ }
+ default: {
+ int sibs = numsiblings[tree->tag];
+ printf("\n");
+ if (sibs >= 1) {
+ printtree(sib1(tree), ident + 2);
+ if (sibs >= 2)
+ printtree(sib2(tree), ident + 2);
+ }
+ break;
+ }
+ }
+}
+
+
+void printktable (lua_State *L, int idx) {
+ int n, i;
+ lua_getuservalue(L, idx);
+ if (lua_isnil(L, -1)) /* no ktable? */
+ return;
+ n = lua_rawlen(L, -1);
+ printf("[");
+ for (i = 1; i <= n; i++) {
+ printf("%d = ", i);
+ lua_rawgeti(L, -1, i);
+ if (lua_isstring(L, -1))
+ printf("%s ", lua_tostring(L, -1));
+ else
+ printf("%s ", lua_typename(L, lua_type(L, -1)));
+ lua_pop(L, 1);
+ }
+ printf("]\n");
+ /* leave ktable at the stack */
+}
+
+/* }====================================================== */
+
+#endif
diff --git a/contrib/lua-lpeg/lpprint.h b/contrib/lua-lpeg/lpprint.h
new file mode 100644
index 0000000..6329760
--- /dev/null
+++ b/contrib/lua-lpeg/lpprint.h
@@ -0,0 +1,36 @@
+/*
+** $Id: lpprint.h,v 1.2 2015/06/12 18:18:08 roberto Exp $
+*/
+
+
+#if !defined(lpprint_h)
+#define lpprint_h
+
+
+#include "lptree.h"
+#include "lpvm.h"
+
+
+#if defined(LPEG_DEBUG)
+
+void printpatt (Instruction *p, int n);
+void printtree (TTree *tree, int ident);
+void printktable (lua_State *L, int idx);
+void printcharset (const byte *st);
+void printcaplist (Capture *cap, Capture *limit);
+void printinst (const Instruction *op, const Instruction *p);
+
+#else
+
+#define printktable(L,idx) \
+ luaL_error(L, "function only implemented in debug mode")
+#define printtree(tree,i) \
+ luaL_error(L, "function only implemented in debug mode")
+#define printpatt(p,n) \
+ luaL_error(L, "function only implemented in debug mode")
+
+#endif
+
+
+#endif
+
diff --git a/contrib/lua-lpeg/lptree.c b/contrib/lua-lpeg/lptree.c
new file mode 100644
index 0000000..df24e3c
--- /dev/null
+++ b/contrib/lua-lpeg/lptree.c
@@ -0,0 +1,1319 @@
+/*
+** $Id: lptree.c,v 1.21 2015/09/28 17:01:25 roberto Exp $
+** Copyright 2013, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+*/
+
+#include <ctype.h>
+#include <limits.h>
+#include <string.h>
+#include <src/lua/lua_common.h>
+
+
+#include "lua.h"
+#include "lauxlib.h"
+
+#include "lptypes.h"
+#include "lpcap.h"
+#include "lpcode.h"
+#include "lpprint.h"
+#include "lptree.h"
+
+
+/* number of siblings for each tree */
+const byte numsiblings[] = {
+ 0, 0, 0, /* char, set, any */
+ 0, 0, /* true, false */
+ 1, /* rep */
+ 2, 2, /* seq, choice */
+ 1, 1, /* not, and */
+ 0, 0, 2, 1, /* call, opencall, rule, grammar */
+ 1, /* behind */
+ 1, 1 /* capture, runtime capture */
+};
+
+
+static TTree *newgrammar (lua_State *L, int arg);
+
+
+/*
+** returns a reasonable name for value at index 'idx' on the stack
+*/
+static const char *val2str (lua_State *L, int idx) {
+ const char *k = lua_tostring(L, idx);
+ if (k != NULL)
+ return lua_pushfstring(L, "%s", k);
+ else
+ return lua_pushfstring(L, "(a %s)", luaL_typename(L, idx));
+}
+
+
+/*
+** Fix a TOpenCall into a TCall node, using table 'postable' to
+** translate a key to its rule address in the tree. Raises an
+** error if key does not exist.
+*/
+static void fixonecall (lua_State *L, int postable, TTree *g, TTree *t) {
+ int n;
+ lua_rawgeti(L, -1, t->key); /* get rule's name */
+ lua_gettable(L, postable); /* query name in position table */
+ n = lua_tonumber(L, -1); /* get (absolute) position */
+ lua_pop(L, 1); /* remove position */
+ if (n == 0) { /* no position? */
+ lua_rawgeti(L, -1, t->key); /* get rule's name again */
+ luaL_error(L, "rule '%s' undefined in given grammar", val2str(L, -1));
+ }
+ t->tag = TCall;
+ t->u.ps = n - (t - g); /* position relative to node */
+ assert(sib2(t)->tag == TRule);
+ sib2(t)->key = t->key;
+}
+
+
+/*
+** Transform left associative constructions into right
+** associative ones, for sequence and choice; that is:
+** (t11 + t12) + t2 => t11 + (t12 + t2)
+** (t11 * t12) * t2 => t11 * (t12 * t2)
+** (that is, Op (Op t11 t12) t2 => Op t11 (Op t12 t2))
+*/
+static void correctassociativity (TTree *tree) {
+ TTree *t1 = sib1(tree);
+ assert(tree->tag == TChoice || tree->tag == TSeq);
+ while (t1->tag == tree->tag) {
+ int n1size = tree->u.ps - 1; /* t1 == Op t11 t12 */
+ int n11size = t1->u.ps - 1;
+ int n12size = n1size - n11size - 1;
+ memmove(sib1(tree), sib1(t1), n11size * sizeof(TTree)); /* move t11 */
+ tree->u.ps = n11size + 1;
+ sib2(tree)->tag = tree->tag;
+ sib2(tree)->u.ps = n12size + 1;
+ }
+}
+
+
+/*
+** Make final adjustments in a tree. Fix open calls in tree 't',
+** making them refer to their respective rules or raising appropriate
+** errors (if not inside a grammar). Correct associativity of associative
+** constructions (making them right associative). Assume that tree's
+** ktable is at the top of the stack (for error messages).
+*/
+static void finalfix (lua_State *L, int postable, TTree *g, TTree *t) {
+ tailcall:
+ switch (t->tag) {
+ case TGrammar: /* subgrammars were already fixed */
+ return;
+ case TOpenCall: {
+ if (g != NULL) /* inside a grammar? */
+ fixonecall(L, postable, g, t);
+ else { /* open call outside grammar */
+ lua_rawgeti(L, -1, t->key);
+ luaL_error(L, "rule '%s' used outside a grammar", val2str(L, -1));
+ }
+ break;
+ }
+ case TSeq: case TChoice:
+ correctassociativity(t);
+ break;
+ }
+ switch (numsiblings[t->tag]) {
+ case 1: /* finalfix(L, postable, g, sib1(t)); */
+ t = sib1(t); goto tailcall;
+ case 2:
+ finalfix(L, postable, g, sib1(t));
+ t = sib2(t); goto tailcall; /* finalfix(L, postable, g, sib2(t)); */
+ default: assert(numsiblings[t->tag] == 0); break;
+ }
+}
+
+
+
+/*
+** {===================================================================
+** KTable manipulation
+**
+** - The ktable of a pattern 'p' can be shared by other patterns that
+** contain 'p' and no other constants. Because of this sharing, we
+** should not add elements to a 'ktable' unless it was freshly created
+** for the new pattern.
+**
+** - The maximum index in a ktable is USHRT_MAX, because trees and
+** patterns use unsigned shorts to store those indices.
+** ====================================================================
+*/
+
+/*
+** Create a new 'ktable' to the pattern at the top of the stack.
+*/
+static void newktable (lua_State *L, int n) {
+ lua_createtable(L, n, 0); /* create a fresh table */
+ lua_setuservalue(L, -2); /* set it as 'ktable' for pattern */
+}
+
+
+/*
+** Add element 'idx' to 'ktable' of pattern at the top of the stack;
+** Return index of new element.
+** If new element is nil, does not add it to table (as it would be
+** useless) and returns 0, as ktable[0] is always nil.
+*/
+static int addtoktable (lua_State *L, int idx) {
+ if (lua_isnil(L, idx)) /* nil value? */
+ return 0;
+ else {
+ int n;
+ lua_getuservalue(L, -1); /* get ktable from pattern */
+ n = lua_rawlen(L, -1);
+ if (n >= USHRT_MAX)
+ luaL_error(L, "too many Lua values in pattern");
+ lua_pushvalue(L, idx); /* element to be added */
+ lua_rawseti(L, -2, ++n);
+ lua_pop(L, 1); /* remove 'ktable' */
+ return n;
+ }
+}
+
+
+/*
+** Return the number of elements in the ktable at 'idx'.
+** In Lua 5.2/5.3, default "environment" for patterns is nil, not
+** a table. Treat it as an empty table. In Lua 5.1, assumes that
+** the environment has no numeric indices (len == 0)
+*/
+static int ktablelen (lua_State *L, int idx) {
+ if (!lua_istable(L, idx)) return 0;
+ else return lua_rawlen(L, idx);
+}
+
+
+/*
+** Concatenate the contents of table 'idx1' into table 'idx2'.
+** (Assume that both indices are negative.)
+** Return the original length of table 'idx2' (or 0, if no
+** element was added, as there is no need to correct any index).
+*/
+static int concattable (lua_State *L, int idx1, int idx2) {
+ int i;
+ int n1 = ktablelen(L, idx1);
+ int n2 = ktablelen(L, idx2);
+ if (n1 + n2 > USHRT_MAX)
+ luaL_error(L, "too many Lua values in pattern");
+ if (n1 == 0) return 0; /* nothing to correct */
+ for (i = 1; i <= n1; i++) {
+ lua_rawgeti(L, idx1, i);
+ lua_rawseti(L, idx2 - 1, n2 + i); /* correct 'idx2' */
+ }
+ return n2;
+}
+
+
+/*
+** When joining 'ktables', constants from one of the subpatterns must
+** be renumbered; 'correctkeys' corrects their indices (adding 'n'
+** to each of them)
+*/
+static void correctkeys (TTree *tree, int n) {
+ if (n == 0) return; /* no correction? */
+ tailcall:
+ switch (tree->tag) {
+ case TOpenCall: case TCall: case TRunTime: case TRule: {
+ if (tree->key > 0)
+ tree->key += n;
+ break;
+ }
+ case TCapture: {
+ if (tree->key > 0 && tree->cap != Carg && tree->cap != Cnum)
+ tree->key += n;
+ break;
+ }
+ default: break;
+ }
+ switch (numsiblings[tree->tag]) {
+ case 1: /* correctkeys(sib1(tree), n); */
+ tree = sib1(tree); goto tailcall;
+ case 2:
+ correctkeys(sib1(tree), n);
+ tree = sib2(tree); goto tailcall; /* correctkeys(sib2(tree), n); */
+ default: assert(numsiblings[tree->tag] == 0); break;
+ }
+}
+
+
+/*
+** Join the ktables from p1 and p2 the ktable for the new pattern at the
+** top of the stack, reusing them when possible.
+*/
+static void joinktables (lua_State *L, int p1, TTree *t2, int p2) {
+ int n1, n2;
+ lua_getuservalue(L, p1); /* get ktables */
+ lua_getuservalue(L, p2);
+ n1 = ktablelen(L, -2);
+ n2 = ktablelen(L, -1);
+ if (n1 == 0 && n2 == 0) /* are both tables empty? */
+ lua_pop(L, 2); /* nothing to be done; pop tables */
+ else if (n2 == 0 || lp_equal(L, -2, -1)) { /* 2nd table empty or equal? */
+ lua_pop(L, 1); /* pop 2nd table */
+ lua_setuservalue(L, -2); /* set 1st ktable into new pattern */
+ }
+ else if (n1 == 0) { /* first table is empty? */
+ lua_setuservalue(L, -3); /* set 2nd table into new pattern */
+ lua_pop(L, 1); /* pop 1st table */
+ }
+ else {
+ lua_createtable(L, n1 + n2, 0); /* create ktable for new pattern */
+ /* stack: new p; ktable p1; ktable p2; new ktable */
+ concattable(L, -3, -1); /* from p1 into new ktable */
+ concattable(L, -2, -1); /* from p2 into new ktable */
+ lua_setuservalue(L, -4); /* new ktable becomes 'p' environment */
+ lua_pop(L, 2); /* pop other ktables */
+ correctkeys(t2, n1); /* correction for indices from p2 */
+ }
+}
+
+
+/*
+** copy 'ktable' of element 'idx' to new tree (on top of stack)
+*/
+static void copyktable (lua_State *L, int idx) {
+ lua_getuservalue(L, idx);
+ lua_setuservalue(L, -2);
+}
+
+
+/*
+** merge 'ktable' from 'stree' at stack index 'idx' into 'ktable'
+** from tree at the top of the stack, and correct corresponding
+** tree.
+*/
+static void mergektable (lua_State *L, int idx, TTree *stree) {
+ int n;
+ lua_getuservalue(L, -1); /* get ktables */
+ lua_getuservalue(L, idx);
+ n = concattable(L, -1, -2);
+ lua_pop(L, 2); /* remove both ktables */
+ correctkeys(stree, n);
+}
+
+
+/*
+** Create a new 'ktable' to the pattern at the top of the stack, adding
+** all elements from pattern 'p' (if not 0) plus element 'idx' to it.
+** Return index of new element.
+*/
+static int addtonewktable (lua_State *L, int p, int idx) {
+ newktable(L, 1);
+ if (p)
+ mergektable(L, p, NULL);
+ return addtoktable(L, idx);
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Tree generation
+** =======================================================
+*/
+
+/*
+** In 5.2, could use 'luaL_testudata'...
+*/
+static int testpattern (lua_State *L, int idx) {
+ if (lua_touserdata(L, idx)) { /* value is a userdata? */
+ if (lua_getmetatable(L, idx)) { /* does it have a metatable? */
+ luaL_getmetatable(L, PATTERN_T);
+ if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
+ lua_pop(L, 2); /* remove both metatables */
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+
+static Pattern *getpattern (lua_State *L, int idx) {
+ return (Pattern *)luaL_checkudata(L, idx, PATTERN_T);
+}
+
+
+static int getsize (lua_State *L, int idx) {
+ return (lua_rawlen(L, idx) - sizeof(Pattern)) / sizeof(TTree) + 1;
+}
+
+
+static TTree *gettree (lua_State *L, int idx, int *len) {
+ Pattern *p = getpattern(L, idx);
+ if (len)
+ *len = getsize(L, idx);
+ return p->tree;
+}
+
+
+/*
+** create a pattern. Set its uservalue (the 'ktable') equal to its
+** metatable. (It could be any empty sequence; the metatable is at
+** hand here, so we use it.)
+*/
+static TTree *newtree (lua_State *L, int len) {
+ size_t size = (len - 1) * sizeof(TTree) + sizeof(Pattern);
+ Pattern *p = (Pattern *)lua_newuserdata(L, size);
+ memset(p, 0, size);
+ luaL_getmetatable(L, PATTERN_T);
+ lua_pushvalue(L, -1);
+ lua_setuservalue(L, -3);
+ lua_setmetatable(L, -2);
+ p->code = NULL; p->codesize = 0;
+ return p->tree;
+}
+
+
+static TTree *newleaf (lua_State *L, int tag) {
+ TTree *tree = newtree(L, 1);
+ tree->tag = tag;
+ return tree;
+}
+
+
+static TTree *newcharset (lua_State *L) {
+ TTree *tree = newtree(L, bytes2slots(CHARSETSIZE) + 1);
+ tree->tag = TSet;
+ loopset(i, treebuffer(tree)[i] = 0);
+ return tree;
+}
+
+
+/*
+** add to tree a sequence where first sibling is 'sib' (with size
+** 'sibsize'); returns position for second sibling
+*/
+static TTree *seqaux (TTree *tree, TTree *sib, int sibsize) {
+ tree->tag = TSeq; tree->u.ps = sibsize + 1;
+ memcpy(sib1(tree), sib, sibsize * sizeof(TTree));
+ return sib2(tree);
+}
+
+
+/*
+** Build a sequence of 'n' nodes, each with tag 'tag' and 'u.n' got
+** from the array 's' (or 0 if array is NULL). (TSeq is binary, so it
+** must build a sequence of sequence of sequence...)
+*/
+static void fillseq (TTree *tree, int tag, int n, const char *s) {
+ int i;
+ for (i = 0; i < n - 1; i++) { /* initial n-1 copies of Seq tag; Seq ... */
+ tree->tag = TSeq; tree->u.ps = 2;
+ sib1(tree)->tag = tag;
+ sib1(tree)->u.n = s ? (byte)s[i] : 0;
+ tree = sib2(tree);
+ }
+ tree->tag = tag; /* last one does not need TSeq */
+ tree->u.n = s ? (byte)s[i] : 0;
+}
+
+
+/*
+** Numbers as patterns:
+** 0 == true (always match); n == TAny repeated 'n' times;
+** -n == not (TAny repeated 'n' times)
+*/
+static TTree *numtree (lua_State *L, int n) {
+ if (n == 0)
+ return newleaf(L, TTrue);
+ else {
+ TTree *tree, *nd;
+ if (n > 0)
+ tree = nd = newtree(L, 2 * n - 1);
+ else { /* negative: code it as !(-n) */
+ n = -n;
+ tree = newtree(L, 2 * n);
+ tree->tag = TNot;
+ nd = sib1(tree);
+ }
+ fillseq(nd, TAny, n, NULL); /* sequence of 'n' any's */
+ return tree;
+ }
+}
+
+
+/*
+** Convert value at index 'idx' to a pattern
+*/
+static TTree *getpatt (lua_State *L, int idx, int *len) {
+ TTree *tree;
+ switch (lua_type(L, idx)) {
+ case LUA_TSTRING: {
+ size_t slen;
+ const char *s = lua_tolstring(L, idx, &slen); /* get string */
+ if (slen == 0) /* empty? */
+ tree = newleaf(L, TTrue); /* always match */
+ else {
+ tree = newtree(L, 2 * (slen - 1) + 1);
+ fillseq(tree, TChar, slen, s); /* sequence of 'slen' chars */
+ }
+ break;
+ }
+ case LUA_TNUMBER: {
+ int n = lua_tointeger(L, idx);
+ tree = numtree(L, n);
+ break;
+ }
+ case LUA_TBOOLEAN: {
+ tree = (lua_toboolean(L, idx) ? newleaf(L, TTrue) : newleaf(L, TFalse));
+ break;
+ }
+ case LUA_TTABLE: {
+ tree = newgrammar(L, idx);
+ break;
+ }
+ case LUA_TFUNCTION: {
+ tree = newtree(L, 2);
+ tree->tag = TRunTime;
+ tree->key = addtonewktable(L, 0, idx);
+ sib1(tree)->tag = TTrue;
+ break;
+ }
+ default: {
+ return gettree(L, idx, len);
+ }
+ }
+ lua_replace(L, idx); /* put new tree into 'idx' slot */
+ if (len)
+ *len = getsize(L, idx);
+ return tree;
+}
+
+
+/*
+** create a new tree, with a new root and one sibling.
+** Sibling must be on the Lua stack, at index 1.
+*/
+static TTree *newroot1sib (lua_State *L, int tag) {
+ int s1;
+ TTree *tree1 = getpatt(L, 1, &s1);
+ TTree *tree = newtree(L, 1 + s1); /* create new tree */
+ tree->tag = tag;
+ memcpy(sib1(tree), tree1, s1 * sizeof(TTree));
+ copyktable(L, 1);
+ return tree;
+}
+
+
+/*
+** create a new tree, with a new root and 2 siblings.
+** Siblings must be on the Lua stack, first one at index 1.
+*/
+static TTree *newroot2sib (lua_State *L, int tag) {
+ int s1, s2;
+ TTree *tree1 = getpatt(L, 1, &s1);
+ TTree *tree2 = getpatt(L, 2, &s2);
+ TTree *tree = newtree(L, 1 + s1 + s2); /* create new tree */
+ tree->tag = tag;
+ tree->u.ps = 1 + s1;
+ memcpy(sib1(tree), tree1, s1 * sizeof(TTree));
+ memcpy(sib2(tree), tree2, s2 * sizeof(TTree));
+ joinktables(L, 1, sib2(tree), 2);
+ return tree;
+}
+
+
+static int lp_P (lua_State *L) {
+ luaL_checkany(L, 1);
+ getpatt(L, 1, NULL);
+ lua_settop(L, 1);
+ return 1;
+}
+
+
+/*
+** sequence operator; optimizations:
+** false x => false, x true => x, true x => x
+** (cannot do x . false => false because x may have runtime captures)
+*/
+static int lp_seq (lua_State *L) {
+ TTree *tree1 = getpatt(L, 1, NULL);
+ TTree *tree2 = getpatt(L, 2, NULL);
+ if (tree1->tag == TFalse || tree2->tag == TTrue)
+ lua_pushvalue(L, 1); /* false . x == false, x . true = x */
+ else if (tree1->tag == TTrue)
+ lua_pushvalue(L, 2); /* true . x = x */
+ else
+ newroot2sib(L, TSeq);
+ return 1;
+}
+
+
+/*
+** choice operator; optimizations:
+** charset / charset => charset
+** true / x => true, x / false => x, false / x => x
+** (x / true is not equivalent to true)
+*/
+static int lp_choice (lua_State *L) {
+ Charset st1, st2;
+ TTree *t1 = getpatt(L, 1, NULL);
+ TTree *t2 = getpatt(L, 2, NULL);
+ if (tocharset(t1, &st1) && tocharset(t2, &st2)) {
+ TTree *t = newcharset(L);
+ loopset(i, treebuffer(t)[i] = st1.cs[i] | st2.cs[i]);
+ }
+ else if (nofail(t1) || t2->tag == TFalse)
+ lua_pushvalue(L, 1); /* true / x => true, x / false => x */
+ else if (t1->tag == TFalse)
+ lua_pushvalue(L, 2); /* false / x => x */
+ else
+ newroot2sib(L, TChoice);
+ return 1;
+}
+
+
+/*
+** p^n
+*/
+static int lp_star (lua_State *L) {
+ int size1;
+ int n = (int)luaL_checkinteger(L, 2);
+ TTree *tree1 = getpatt(L, 1, &size1);
+ if (n >= 0) { /* seq tree1 (seq tree1 ... (seq tree1 (rep tree1))) */
+ TTree *tree = newtree(L, (n + 1) * (size1 + 1));
+ if (nullable(tree1))
+ luaL_error(L, "loop body may accept empty string");
+ while (n--) /* repeat 'n' times */
+ tree = seqaux(tree, tree1, size1);
+ tree->tag = TRep;
+ memcpy(sib1(tree), tree1, size1 * sizeof(TTree));
+ }
+ else { /* choice (seq tree1 ... choice tree1 true ...) true */
+ TTree *tree;
+ n = -n;
+ /* size = (choice + seq + tree1 + true) * n, but the last has no seq */
+ tree = newtree(L, n * (size1 + 3) - 1);
+ for (; n > 1; n--) { /* repeat (n - 1) times */
+ tree->tag = TChoice; tree->u.ps = n * (size1 + 3) - 2;
+ sib2(tree)->tag = TTrue;
+ tree = sib1(tree);
+ tree = seqaux(tree, tree1, size1);
+ }
+ tree->tag = TChoice; tree->u.ps = size1 + 1;
+ sib2(tree)->tag = TTrue;
+ memcpy(sib1(tree), tree1, size1 * sizeof(TTree));
+ }
+ copyktable(L, 1);
+ return 1;
+}
+
+
+/*
+** #p == &p
+*/
+static int lp_and (lua_State *L) {
+ newroot1sib(L, TAnd);
+ return 1;
+}
+
+
+/*
+** -p == !p
+*/
+static int lp_not (lua_State *L) {
+ newroot1sib(L, TNot);
+ return 1;
+}
+
+
+/*
+** [t1 - t2] == Seq (Not t2) t1
+** If t1 and t2 are charsets, make their difference.
+*/
+static int lp_sub (lua_State *L) {
+ Charset st1, st2;
+ int s1, s2;
+ TTree *t1 = getpatt(L, 1, &s1);
+ TTree *t2 = getpatt(L, 2, &s2);
+ if (tocharset(t1, &st1) && tocharset(t2, &st2)) {
+ TTree *t = newcharset(L);
+ loopset(i, treebuffer(t)[i] = st1.cs[i] & ~st2.cs[i]);
+ }
+ else {
+ TTree *tree = newtree(L, 2 + s1 + s2);
+ tree->tag = TSeq; /* sequence of... */
+ tree->u.ps = 2 + s2;
+ sib1(tree)->tag = TNot; /* ...not... */
+ memcpy(sib1(sib1(tree)), t2, s2 * sizeof(TTree)); /* ...t2 */
+ memcpy(sib2(tree), t1, s1 * sizeof(TTree)); /* ... and t1 */
+ joinktables(L, 1, sib1(tree), 2);
+ }
+ return 1;
+}
+
+
+static int lp_set (lua_State *L) {
+ size_t l;
+ const char *s = luaL_checklstring(L, 1, &l);
+ TTree *tree = newcharset(L);
+ while (l--) {
+ setchar(treebuffer(tree), (byte)(*s));
+ s++;
+ }
+ return 1;
+}
+
+
+static int lp_range (lua_State *L) {
+ int arg;
+ int top = lua_gettop(L);
+ TTree *tree = newcharset(L);
+ for (arg = 1; arg <= top; arg++) {
+ int c;
+ size_t l;
+ const char *r = luaL_checklstring(L, arg, &l);
+ luaL_argcheck(L, l == 2, arg, "range must have two characters");
+ for (c = (byte)r[0]; c <= (byte)r[1]; c++)
+ setchar(treebuffer(tree), c);
+ }
+ return 1;
+}
+
+
+/*
+** Look-behind predicate
+*/
+static int lp_behind (lua_State *L) {
+ TTree *tree;
+ TTree *tree1 = getpatt(L, 1, NULL);
+ int n = fixedlen(tree1);
+ luaL_argcheck(L, n >= 0, 1, "pattern may not have fixed length");
+ luaL_argcheck(L, !hascaptures(tree1), 1, "pattern have captures");
+ luaL_argcheck(L, n <= MAXBEHIND, 1, "pattern too long to look behind");
+ tree = newroot1sib(L, TBehind);
+ tree->u.n = n;
+ return 1;
+}
+
+
+/*
+** Create a non-terminal
+*/
+static int lp_V (lua_State *L) {
+ TTree *tree = newleaf(L, TOpenCall);
+ luaL_argcheck(L, !lua_isnoneornil(L, 1), 1, "non-nil value expected");
+ tree->key = addtonewktable(L, 0, 1);
+ return 1;
+}
+
+
+/*
+** Create a tree for a non-empty capture, with a body and
+** optionally with an associated Lua value (at index 'labelidx' in the
+** stack)
+*/
+static int capture_aux (lua_State *L, int cap, int labelidx) {
+ TTree *tree = newroot1sib(L, TCapture);
+ tree->cap = cap;
+ tree->key = (labelidx == 0) ? 0 : addtonewktable(L, 1, labelidx);
+ return 1;
+}
+
+
+/*
+** Fill a tree with an empty capture, using an empty (TTrue) sibling.
+*/
+static TTree *auxemptycap (TTree *tree, int cap) {
+ tree->tag = TCapture;
+ tree->cap = cap;
+ sib1(tree)->tag = TTrue;
+ return tree;
+}
+
+
+/*
+** Create a tree for an empty capture
+*/
+static TTree *newemptycap (lua_State *L, int cap) {
+ return auxemptycap(newtree(L, 2), cap);
+}
+
+
+/*
+** Create a tree for an empty capture with an associated Lua value
+*/
+static TTree *newemptycapkey (lua_State *L, int cap, int idx) {
+ TTree *tree = auxemptycap(newtree(L, 2), cap);
+ tree->key = addtonewktable(L, 0, idx);
+ return tree;
+}
+
+
+/*
+** Captures with syntax p / v
+** (function capture, query capture, string capture, or number capture)
+*/
+static int lp_divcapture (lua_State *L) {
+ switch (lua_type(L, 2)) {
+ case LUA_TFUNCTION: return capture_aux(L, Cfunction, 2);
+ case LUA_TTABLE: return capture_aux(L, Cquery, 2);
+ case LUA_TSTRING: return capture_aux(L, Cstring, 2);
+ case LUA_TNUMBER: {
+ int n = lua_tointeger(L, 2);
+ TTree *tree = newroot1sib(L, TCapture);
+ luaL_argcheck(L, 0 <= n && n <= SHRT_MAX, 1, "invalid number");
+ tree->cap = Cnum;
+ tree->key = n;
+ return 1;
+ }
+ default: return luaL_argerror(L, 2, "invalid replacement value");
+ }
+}
+
+
+static int lp_substcapture (lua_State *L) {
+ return capture_aux(L, Csubst, 0);
+}
+
+
+static int lp_tablecapture (lua_State *L) {
+ return capture_aux(L, Ctable, 0);
+}
+
+
+static int lp_groupcapture (lua_State *L) {
+ if (lua_isnoneornil(L, 2))
+ return capture_aux(L, Cgroup, 0);
+ else
+ return capture_aux(L, Cgroup, 2);
+}
+
+
+static int lp_foldcapture (lua_State *L) {
+ luaL_checktype(L, 2, LUA_TFUNCTION);
+ return capture_aux(L, Cfold, 2);
+}
+
+
+static int lp_simplecapture (lua_State *L) {
+ return capture_aux(L, Csimple, 0);
+}
+
+
+static int lp_poscapture (lua_State *L) {
+ newemptycap(L, Cposition);
+ return 1;
+}
+
+
+static int lp_argcapture (lua_State *L) {
+ int n = (int)luaL_checkinteger(L, 1);
+ TTree *tree = newemptycap(L, Carg);
+ tree->key = n;
+ luaL_argcheck(L, 0 < n && n <= SHRT_MAX, 1, "invalid argument index");
+ return 1;
+}
+
+
+static int lp_backref (lua_State *L) {
+ luaL_checkany(L, 1);
+ newemptycapkey(L, Cbackref, 1);
+ return 1;
+}
+
+
+/*
+** Constant capture
+*/
+static int lp_constcapture (lua_State *L) {
+ int i;
+ int n = lua_gettop(L); /* number of values */
+ if (n == 0) /* no values? */
+ newleaf(L, TTrue); /* no capture */
+ else if (n == 1)
+ newemptycapkey(L, Cconst, 1); /* single constant capture */
+ else { /* create a group capture with all values */
+ TTree *tree = newtree(L, 1 + 3 * (n - 1) + 2);
+ newktable(L, n); /* create a 'ktable' for new tree */
+ tree->tag = TCapture;
+ tree->cap = Cgroup;
+ tree->key = 0;
+ tree = sib1(tree);
+ for (i = 1; i <= n - 1; i++) {
+ tree->tag = TSeq;
+ tree->u.ps = 3; /* skip TCapture and its sibling */
+ auxemptycap(sib1(tree), Cconst);
+ sib1(tree)->key = addtoktable(L, i);
+ tree = sib2(tree);
+ }
+ auxemptycap(tree, Cconst);
+ tree->key = addtoktable(L, i);
+ }
+ return 1;
+}
+
+
+static int lp_matchtime (lua_State *L) {
+ TTree *tree;
+ luaL_checktype(L, 2, LUA_TFUNCTION);
+ tree = newroot1sib(L, TRunTime);
+ tree->key = addtonewktable(L, 1, 2);
+ return 1;
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Grammar - Tree generation
+** =======================================================
+*/
+
+/*
+** push on the stack the index and the pattern for the
+** initial rule of grammar at index 'arg' in the stack;
+** also add that index into position table.
+*/
+static void getfirstrule (lua_State *L, int arg, int postab) {
+ lua_rawgeti(L, arg, 1); /* access first element */
+ if (lua_isstring(L, -1)) { /* is it the name of initial rule? */
+ lua_pushvalue(L, -1); /* duplicate it to use as key */
+ lua_gettable(L, arg); /* get associated rule */
+ }
+ else {
+ lua_pushinteger(L, 1); /* key for initial rule */
+ lua_insert(L, -2); /* put it before rule */
+ }
+ if (!testpattern(L, -1)) { /* initial rule not a pattern? */
+ if (lua_isnil(L, -1))
+ luaL_error(L, "grammar has no initial rule");
+ else
+ luaL_error(L, "initial rule '%s' is not a pattern", lua_tostring(L, -2));
+ }
+ lua_pushvalue(L, -2); /* push key */
+ lua_pushinteger(L, 1); /* push rule position (after TGrammar) */
+ lua_settable(L, postab); /* insert pair at position table */
+}
+
+/*
+** traverse grammar at index 'arg', pushing all its keys and patterns
+** into the stack. Create a new table (before all pairs key-pattern) to
+** collect all keys and their associated positions in the final tree
+** (the "position table").
+** Return the number of rules and (in 'totalsize') the total size
+** for the new tree.
+*/
+static int collectrules (lua_State *L, int arg, int *totalsize) {
+ int n = 1; /* to count number of rules */
+ int postab = lua_gettop(L) + 1; /* index of position table */
+ int size; /* accumulator for total size */
+ lua_newtable(L); /* create position table */
+ getfirstrule(L, arg, postab);
+ size = 2 + getsize(L, postab + 2); /* TGrammar + TRule + rule */
+ lua_pushnil(L); /* prepare to traverse grammar table */
+ while (lua_next(L, arg) != 0) {
+ if (lua_tonumber(L, -2) == 1 ||
+ lp_equal(L, -2, postab + 1)) { /* initial rule? */
+ lua_pop(L, 1); /* remove value (keep key for lua_next) */
+ continue;
+ }
+ if (!testpattern(L, -1)) /* value is not a pattern? */
+ luaL_error(L, "rule '%s' is not a pattern", val2str(L, -2));
+ luaL_checkstack(L, LUA_MINSTACK, "grammar has too many rules");
+ lua_pushvalue(L, -2); /* push key (to insert into position table) */
+ lua_pushinteger(L, size);
+ lua_settable(L, postab);
+ size += 1 + getsize(L, -1); /* update size */
+ lua_pushvalue(L, -2); /* push key (for next lua_next) */
+ n++;
+ }
+ *totalsize = size + 1; /* TTrue to finish list of rules */
+ return n;
+}
+
+
+static void buildgrammar (lua_State *L, TTree *grammar, int frule, int n) {
+ int i;
+ TTree *nd = sib1(grammar); /* auxiliary pointer to traverse the tree */
+ for (i = 0; i < n; i++) { /* add each rule into new tree */
+ int ridx = frule + 2*i + 1; /* index of i-th rule */
+ int rulesize;
+ TTree *rn = gettree(L, ridx, &rulesize);
+ nd->tag = TRule;
+ nd->key = 0;
+ nd->cap = i; /* rule number */
+ nd->u.ps = rulesize + 1; /* point to next rule */
+ memcpy(sib1(nd), rn, rulesize * sizeof(TTree)); /* copy rule */
+ mergektable(L, ridx, sib1(nd)); /* merge its ktable into new one */
+ nd = sib2(nd); /* move to next rule */
+ }
+ nd->tag = TTrue; /* finish list of rules */
+}
+
+
+/*
+** Check whether a tree has potential infinite loops
+*/
+static int checkloops (TTree *tree) {
+ tailcall:
+ if (tree->tag == TRep && nullable(sib1(tree)))
+ return 1;
+ else if (tree->tag == TGrammar)
+ return 0; /* sub-grammars already checked */
+ else {
+ switch (numsiblings[tree->tag]) {
+ case 1: /* return checkloops(sib1(tree)); */
+ tree = sib1(tree); goto tailcall;
+ case 2:
+ if (checkloops(sib1(tree))) return 1;
+ /* else return checkloops(sib2(tree)); */
+ tree = sib2(tree); goto tailcall;
+ default: assert(numsiblings[tree->tag] == 0); return 0;
+ }
+ }
+}
+
+
+static int verifyerror (lua_State *L, int *passed, int npassed) {
+ int i, j;
+ for (i = npassed - 1; i >= 0; i--) { /* search for a repetition */
+ for (j = i - 1; j >= 0; j--) {
+ if (passed[i] == passed[j]) {
+ lua_rawgeti(L, -1, passed[i]); /* get rule's key */
+ return luaL_error(L, "rule '%s' may be left recursive", val2str(L, -1));
+ }
+ }
+ }
+ return luaL_error(L, "too many left calls in grammar");
+}
+
+
+/*
+** Check whether a rule can be left recursive; raise an error in that
+** case; otherwise return 1 iff pattern is nullable.
+** The return value is used to check sequences, where the second pattern
+** is only relevant if the first is nullable.
+** Parameter 'nb' works as an accumulator, to allow tail calls in
+** choices. ('nb' true makes function returns true.)
+** Assume ktable at the top of the stack.
+*/
+static int verifyrule (lua_State *L, TTree *tree, int *passed, int npassed,
+ int nb) {
+ tailcall:
+ switch (tree->tag) {
+ case TChar: case TSet: case TAny:
+ case TFalse:
+ return nb; /* cannot pass from here */
+ case TTrue:
+ case TBehind: /* look-behind cannot have calls */
+ return 1;
+ case TNot: case TAnd: case TRep:
+ /* return verifyrule(L, sib1(tree), passed, npassed, 1); */
+ tree = sib1(tree); nb = 1; goto tailcall;
+ case TCapture: case TRunTime:
+ /* return verifyrule(L, sib1(tree), passed, npassed, nb); */
+ tree = sib1(tree); goto tailcall;
+ case TCall:
+ /* return verifyrule(L, sib2(tree), passed, npassed, nb); */
+ tree = sib2(tree); goto tailcall;
+ case TSeq: /* only check 2nd child if first is nb */
+ if (!verifyrule(L, sib1(tree), passed, npassed, 0))
+ return nb;
+ /* else return verifyrule(L, sib2(tree), passed, npassed, nb); */
+ tree = sib2(tree); goto tailcall;
+ case TChoice: /* must check both children */
+ nb = verifyrule(L, sib1(tree), passed, npassed, nb);
+ /* return verifyrule(L, sib2(tree), passed, npassed, nb); */
+ tree = sib2(tree); goto tailcall;
+ case TRule:
+ if (npassed >= MAXRULES)
+ return verifyerror(L, passed, npassed);
+ else {
+ passed[npassed++] = tree->key;
+ /* return verifyrule(L, sib1(tree), passed, npassed); */
+ tree = sib1(tree); goto tailcall;
+ }
+ case TGrammar:
+ return nullable(tree); /* sub-grammar cannot be left recursive */
+ default: assert(0); return 0;
+ }
+}
+
+
+static void verifygrammar (lua_State *L, TTree *grammar) {
+ int passed[MAXRULES];
+ TTree *rule;
+ /* check left-recursive rules */
+ for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) {
+ if (rule->key == 0) continue; /* unused rule */
+ verifyrule(L, sib1(rule), passed, 0, 0);
+ }
+ assert(rule->tag == TTrue);
+ /* check infinite loops inside rules */
+ for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) {
+ if (rule->key == 0) continue; /* unused rule */
+ if (checkloops(sib1(rule))) {
+ lua_rawgeti(L, -1, rule->key); /* get rule's key */
+ luaL_error(L, "empty loop in rule '%s'", val2str(L, -1));
+ }
+ }
+ assert(rule->tag == TTrue);
+}
+
+
+/*
+** Give a name for the initial rule if it is not referenced
+*/
+static void initialrulename (lua_State *L, TTree *grammar, int frule) {
+ if (sib1(grammar)->key == 0) { /* initial rule is not referenced? */
+ int n = lua_rawlen(L, -1) + 1; /* index for name */
+ lua_pushvalue(L, frule); /* rule's name */
+ lua_rawseti(L, -2, n); /* ktable was on the top of the stack */
+ sib1(grammar)->key = n;
+ }
+}
+
+
+static TTree *newgrammar (lua_State *L, int arg) {
+ int treesize;
+ int frule = lua_gettop(L) + 2; /* position of first rule's key */
+ int n = collectrules(L, arg, &treesize);
+ TTree *g = newtree(L, treesize);
+ luaL_argcheck(L, n <= MAXRULES, arg, "grammar has too many rules");
+ g->tag = TGrammar; g->u.n = n;
+ lua_newtable(L); /* create 'ktable' */
+ lua_setuservalue(L, -2);
+ buildgrammar(L, g, frule, n);
+ lua_getuservalue(L, -1); /* get 'ktable' for new tree */
+ finalfix(L, frule - 1, g, sib1(g));
+ initialrulename(L, g, frule);
+ verifygrammar(L, g);
+ lua_pop(L, 1); /* remove 'ktable' */
+ lua_insert(L, -(n * 2 + 2)); /* move new table to proper position */
+ lua_pop(L, n * 2 + 1); /* remove position table + rule pairs */
+ return g; /* new table at the top of the stack */
+}
+
+/* }====================================================== */
+
+
+static Instruction *prepcompile (lua_State *L, Pattern *p, int idx) {
+ lua_getuservalue(L, idx); /* push 'ktable' (may be used by 'finalfix') */
+ finalfix(L, 0, NULL, p->tree);
+ lua_pop(L, 1); /* remove 'ktable' */
+ return compile(L, p);
+}
+
+
+static int lp_printtree (lua_State *L) {
+ TTree *tree = getpatt(L, 1, NULL);
+ int c = lua_toboolean(L, 2);
+ if (c) {
+ lua_getuservalue(L, 1); /* push 'ktable' (may be used by 'finalfix') */
+ finalfix(L, 0, NULL, tree);
+ lua_pop(L, 1); /* remove 'ktable' */
+ }
+ printktable(L, 1);
+ printtree(tree, 0);
+ return 0;
+}
+
+
+static int lp_printcode (lua_State *L) {
+ Pattern *p = getpattern(L, 1);
+ printktable(L, 1);
+ if (p->code == NULL) /* not compiled yet? */
+ prepcompile(L, p, 1);
+ printpatt(p->code, p->codesize);
+ return 0;
+}
+
+
+/*
+** Get the initial position for the match, interpreting negative
+** values from the end of the subject
+*/
+static size_t initposition (lua_State *L, size_t len) {
+ lua_Integer ii = luaL_optinteger(L, 3, 1);
+ if (ii > 0) { /* positive index? */
+ if ((size_t)ii <= len) /* inside the string? */
+ return (size_t)ii - 1; /* return it (corrected to 0-base) */
+ else return len; /* crop at the end */
+ }
+ else { /* negative index */
+ if ((size_t)(-ii) <= len) /* inside the string? */
+ return len - ((size_t)(-ii)); /* return position from the end */
+ else return 0; /* crop at the beginning */
+ }
+}
+
+
+/*
+** Main match function
+*/
+static int lp_match (lua_State *L) {
+ Capture capture[INITCAPSIZE];
+ const char *r;
+ size_t l;
+ const char *s;
+
+ Pattern *p = (getpatt(L, 1, NULL), getpattern(L, 1));
+ Instruction *code = (p->code != NULL) ? p->code : prepcompile(L, p, 1);
+
+ if (lua_type (L, SUBJIDX) == LUA_TSTRING) {
+ s = luaL_checklstring (L, SUBJIDX, &l);
+ }
+ else if (lua_type (L, SUBJIDX) == LUA_TUSERDATA) {
+ struct rspamd_lua_text *t = lua_check_text (L, SUBJIDX);
+ if (!t) {
+ return luaL_error (L, "invalid argument (not a text)");
+ }
+ s = t->start;
+ l = t->len;
+
+ if (s == NULL) {
+ lua_pushnil(L);
+ return 1;
+ }
+ }
+ else {
+ return luaL_error (L, "invalid argument: %s",
+ lua_typename (L, lua_type (L, SUBJIDX)));
+ }
+ size_t i = initposition(L, l);
+ int ptop = lua_gettop(L), rs;
+ lua_pushnil(L); /* initialize subscache */
+ lua_pushlightuserdata(L, capture); /* initialize caplistidx */
+ lua_getuservalue(L, 1); /* initialize penvidx */
+ r = match(L, s, s + i, s + l, code, capture, ptop);
+ if (r == NULL) {
+ lua_pushnil(L);
+ return 1;
+ }
+ rs = getcaptures(L, s, r, ptop);
+ return rs;
+}
+
+
+
+/*
+** {======================================================
+** Library creation and functions not related to matching
+** =======================================================
+*/
+
+/* maximum limit for stack size */
+#define MAXLIM (INT_MAX / 100)
+
+static int lp_setmax (lua_State *L) {
+ lua_Integer lim = luaL_checkinteger(L, 1);
+ luaL_argcheck(L, 0 < lim && lim <= MAXLIM, 1, "out of range");
+ lua_settop(L, 1);
+ lua_setfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX);
+ return 0;
+}
+
+
+static int lp_version (lua_State *L) {
+ lua_pushstring(L, VERSION);
+ return 1;
+}
+
+
+static int lp_type (lua_State *L) {
+ if (testpattern(L, 1))
+ lua_pushliteral(L, "pattern");
+ else
+ lua_pushnil(L);
+ return 1;
+}
+
+
+int lp_gc (lua_State *L) {
+ Pattern *p = getpattern(L, 1);
+ realloccode(L, p, 0); /* delete code block */
+ return 0;
+}
+
+
+static void createcat (lua_State *L, const char *catname, int (catf) (int)) {
+ TTree *t = newcharset(L);
+ int i;
+ for (i = 0; i <= UCHAR_MAX; i++)
+ if (catf(i)) setchar(treebuffer(t), i);
+ lua_setfield(L, -2, catname);
+}
+
+
+static int lp_locale (lua_State *L) {
+ if (lua_isnoneornil(L, 1)) {
+ lua_settop(L, 0);
+ lua_createtable(L, 0, 12);
+ }
+ else {
+ luaL_checktype(L, 1, LUA_TTABLE);
+ lua_settop(L, 1);
+ }
+ createcat(L, "alnum", isalnum);
+ createcat(L, "alpha", isalpha);
+ createcat(L, "cntrl", iscntrl);
+ createcat(L, "digit", isdigit);
+ createcat(L, "graph", isgraph);
+ createcat(L, "lower", islower);
+ createcat(L, "print", isprint);
+ createcat(L, "punct", ispunct);
+ createcat(L, "space", isspace);
+ createcat(L, "upper", isupper);
+ createcat(L, "xdigit", isxdigit);
+ return 1;
+}
+
+
+static struct luaL_Reg pattreg[] = {
+ {"ptree", lp_printtree},
+ {"pcode", lp_printcode},
+ {"match", lp_match},
+ {"B", lp_behind},
+ {"V", lp_V},
+ {"C", lp_simplecapture},
+ {"Cc", lp_constcapture},
+ {"Cmt", lp_matchtime},
+ {"Cb", lp_backref},
+ {"Carg", lp_argcapture},
+ {"Cp", lp_poscapture},
+ {"Cs", lp_substcapture},
+ {"Ct", lp_tablecapture},
+ {"Cf", lp_foldcapture},
+ {"Cg", lp_groupcapture},
+ {"P", lp_P},
+ {"S", lp_set},
+ {"R", lp_range},
+ {"locale", lp_locale},
+ {"version", lp_version},
+ {"setmaxstack", lp_setmax},
+ {"type", lp_type},
+ {NULL, NULL}
+};
+
+
+static struct luaL_Reg metareg[] = {
+ {"__mul", lp_seq},
+ {"__add", lp_choice},
+ {"__pow", lp_star},
+ {"__gc", lp_gc},
+ {"__len", lp_and},
+ {"__div", lp_divcapture},
+ {"__unm", lp_not},
+ {"__sub", lp_sub},
+ {NULL, NULL}
+};
+
+int luaopen_lpeg (lua_State *L) {
+ luaL_newmetatable(L, PATTERN_T);
+ lua_pushnumber(L, MAXBACK); /* initialize maximum backtracking */
+ lua_setfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX);
+ luaL_setfuncs(L, metareg, 0);
+ luaL_newlib(L, pattreg);
+ lua_pushvalue(L, -1);
+ lua_setfield(L, -3, "__index");
+ return 1;
+}
+
+/* }====================================================== */
diff --git a/contrib/lua-lpeg/lptree.h b/contrib/lua-lpeg/lptree.h
new file mode 100644
index 0000000..38a668e
--- /dev/null
+++ b/contrib/lua-lpeg/lptree.h
@@ -0,0 +1,77 @@
+/*
+** $Id: lptree.h,v 1.2 2013/03/24 13:51:12 roberto Exp $
+*/
+
+#if !defined(lptree_h)
+#define lptree_h
+
+
+#include "lptypes.h"
+
+
+/*
+** types of trees
+*/
+typedef enum TTag {
+ TChar = 0, TSet, TAny, /* standard PEG elements */
+ TTrue, TFalse,
+ TRep,
+ TSeq, TChoice,
+ TNot, TAnd,
+ TCall,
+ TOpenCall,
+ TRule, /* sib1 is rule's pattern, sib2 is 'next' rule */
+ TGrammar, /* sib1 is initial (and first) rule */
+ TBehind, /* match behind */
+ TCapture, /* regular capture */
+ TRunTime /* run-time capture */
+} TTag;
+
+/* number of siblings for each tree */
+extern const byte numsiblings[];
+
+
+/*
+** Tree trees
+** The first sibling of a tree (if there is one) is immediately after
+** the tree. A reference to a second sibling (ps) is its position
+** relative to the position of the tree itself. A key in ktable
+** uses the (unique) address of the original tree that created that
+** entry. NULL means no data.
+*/
+typedef struct TTree {
+ byte tag;
+ byte cap; /* kind of capture (if it is a capture) */
+ unsigned short key; /* key in ktable for Lua data (0 if no key) */
+ union {
+ int ps; /* occasional second sibling */
+ int n; /* occasional counter */
+ } u;
+} TTree;
+
+
+/*
+** A complete pattern has its tree plus, if already compiled,
+** its corresponding code
+*/
+typedef struct Pattern {
+ union Instruction *code;
+ int codesize;
+ TTree tree[1];
+} Pattern;
+
+
+/* number of siblings for each tree */
+extern const byte numsiblings[];
+
+/* access to siblings */
+#define sib1(t) ((t) + 1)
+#define sib2(t) ((t) + (t)->u.ps)
+
+
+int luaopen_lpeg (lua_State *L);
+
+
+
+#endif
+
diff --git a/contrib/lua-lpeg/lptypes.h b/contrib/lua-lpeg/lptypes.h
new file mode 100644
index 0000000..f541c7a
--- /dev/null
+++ b/contrib/lua-lpeg/lptypes.h
@@ -0,0 +1,154 @@
+/*
+** $Id: lptypes.h,v 1.14 2015/09/28 17:17:41 roberto Exp $
+** LPeg - PEG pattern matching for Lua
+** Copyright 2007-2015, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+** written by Roberto Ierusalimschy
+*/
+
+#if !defined(lptypes_h)
+#define lptypes_h
+
+
+#if !defined(LPEG_DEBUG) && !defined(NDEBUG)
+#define NDEBUG
+#endif
+
+#include <assert.h>
+#include <limits.h>
+
+#include "lua.h"
+
+
+#define VERSION "1.0.0"
+
+
+#define PATTERN_T "lpeg-pattern"
+#define MAXSTACKIDX "lpeg-maxstack"
+
+
+/*
+** compatibility with Lua 5.1
+*/
+#if (LUA_VERSION_NUM == 501)
+
+#define lp_equal lua_equal
+
+#define lua_getuservalue lua_getfenv
+#define lua_setuservalue lua_setfenv
+
+#ifndef lua_rawlen
+#define lua_rawlen lua_objlen
+#endif
+
+#ifndef luaL_setfuncs
+#define luaL_setfuncs(L,f,n) luaL_register(L,NULL,f)
+#endif
+#ifndef luaL_newlib
+#define luaL_newlib(L,f) luaL_register(L,"lpeg",f)
+#endif
+#endif
+
+
+#if !defined(lp_equal)
+#define lp_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ)
+#endif
+
+
+/* default maximum size for call/backtrack stack */
+#if !defined(MAXBACK)
+#define MAXBACK 400
+#endif
+
+
+/* maximum number of rules in a grammar */
+#if !defined(MAXRULES)
+#define MAXRULES 1000
+#endif
+
+
+
+/* initial size for capture's list */
+#define INITCAPSIZE 32
+
+
+/* index, on Lua stack, for subject */
+#define SUBJIDX 2
+
+/* number of fixed arguments to 'match' (before capture arguments) */
+#define FIXEDARGS 3
+
+/* index, on Lua stack, for capture list */
+#define caplistidx(ptop) ((ptop) + 2)
+
+/* index, on Lua stack, for pattern's ktable */
+#define ktableidx(ptop) ((ptop) + 3)
+
+/* index, on Lua stack, for backtracking stack */
+#define stackidx(ptop) ((ptop) + 4)
+
+
+
+typedef unsigned char byte;
+
+
+#define BITSPERCHAR 8
+
+#define CHARSETSIZE ((UCHAR_MAX/BITSPERCHAR) + 1)
+
+
+
+typedef struct Charset {
+ byte cs[CHARSETSIZE];
+} Charset;
+
+
+
+#define loopset(v,b) { int v; for (v = 0; v < CHARSETSIZE; v++) {b;} }
+
+/* access to charset */
+#define treebuffer(t) ((byte *)((t) + 1))
+
+/* number of slots needed for 'n' bytes */
+#define bytes2slots(n) (((n) - 1) / sizeof(TTree) + 1)
+
+/* set 'b' bit in charset 'cs' */
+#define setchar(cs,b) ((cs)[(b) >> 3] |= (1 << ((b) & 7)))
+
+
+/*
+** in capture instructions, 'kind' of capture and its offset are
+** packed in field 'aux', 4 bits for each
+*/
+#define getkind(op) ((op)->i.aux & 0xF)
+#define getoff(op) (((op)->i.aux >> 4) & 0xF)
+#define joinkindoff(k,o) ((k) | ((o) << 4))
+
+#define MAXOFF 0xF
+#define MAXAUX 0xFF
+
+
+/* maximum number of bytes to look behind */
+#define MAXBEHIND MAXAUX
+
+
+/* maximum size (in elements) for a pattern */
+#define MAXPATTSIZE (SHRT_MAX - 10)
+
+
+/* size (in elements) for an instruction plus extra l bytes */
+#define instsize(l) (((l) + sizeof(Instruction) - 1)/sizeof(Instruction) + 1)
+
+
+/* size (in elements) for a ISet instruction */
+#define CHARSETINSTSIZE instsize(CHARSETSIZE)
+
+/* size (in elements) for a IFunc instruction */
+#define funcinstsize(p) ((p)->i.aux + 2)
+
+
+
+#define testchar(st,c) (((int)(st)[((c) >> 3)] & (1 << ((c) & 7))))
+
+
+#endif
+
diff --git a/contrib/lua-lpeg/lpvm.c b/contrib/lua-lpeg/lpvm.c
new file mode 100644
index 0000000..0dfca18
--- /dev/null
+++ b/contrib/lua-lpeg/lpvm.c
@@ -0,0 +1,383 @@
+/*
+** $Id: lpvm.c,v 1.6 2015/09/28 17:01:25 roberto Exp $
+** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
+*/
+
+#include "config.h"
+
+#include <limits.h>
+#include <string.h>
+
+
+#include "lua.h"
+#include "lauxlib.h"
+
+#include "lpcap.h"
+#include "lptypes.h"
+#include "lpvm.h"
+#include "lpprint.h"
+
+/* initial size for call/backtrack stack */
+#if !defined(INITBACK)
+#define INITBACK MAXBACK
+#endif
+
+
+#define getoffset(p) (((p) + 1)->offset)
+
+static const Instruction giveup = {{IGiveup, 0, 0}};
+
+
+/*
+** {======================================================
+** Virtual Machine
+** =======================================================
+*/
+
+
+typedef struct Stack {
+ const char *s; /* saved position (or NULL for calls) */
+ const Instruction *p; /* next instruction */
+ int caplevel;
+} Stack;
+
+
+#define getstackbase(L, ptop) ((Stack *)lua_touserdata(L, stackidx(ptop)))
+
+
+/*
+** Ensures the size of array 'capture' (with size '*capsize' and
+** 'captop' elements being used) is enough to accomodate 'n' extra
+** elements plus one. (Because several opcodes add stuff to the capture
+** array, it is simpler to ensure the array always has at least one free
+** slot upfront and check its size later.)
+*/
+static Capture *growcap (lua_State *L, Capture *capture, int *capsize,
+ int captop, int n, int ptop) {
+ if (*capsize - captop > n)
+ return capture; /* no need to grow array */
+ else { /* must grow */
+ Capture *newc;
+ int newsize = captop + n + 1; /* minimum size needed */
+ if (newsize < INT_MAX/((int)sizeof(Capture) * 2))
+ newsize *= 2; /* twice that size, if not too big */
+ else if (newsize >= INT_MAX/((int)sizeof(Capture)))
+ luaL_error(L, "too many captures");
+ newc = (Capture *)lua_newuserdata(L, newsize * sizeof(Capture));
+ memcpy(newc, capture, captop * sizeof(Capture));
+ *capsize = newsize;
+ lua_replace(L, caplistidx(ptop));
+ return newc;
+ }
+}
+
+
+/*
+** Double the size of the stack
+*/
+static Stack *doublestack (lua_State *L, Stack **stacklimit, int ptop) {
+ Stack *stack = getstackbase(L, ptop);
+ Stack *newstack;
+ int n = *stacklimit - stack; /* current stack size */
+ int max, newn;
+ lua_getfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX);
+ max = lua_tointeger(L, -1); /* maximum allowed size */
+ lua_pop(L, 1);
+ if (n >= max) /* already at maximum size? */
+ luaL_error(L, "backtrack stack overflow (current limit is %d)", max);
+ newn = 2 * n; /* new size */
+ if (newn > max) newn = max;
+ newstack = (Stack *)lua_newuserdata(L, newn * sizeof(Stack));
+ memcpy(newstack, stack, n * sizeof(Stack));
+ lua_replace(L, stackidx(ptop));
+ *stacklimit = newstack + newn;
+ return newstack + n; /* return next position */
+}
+
+
+/*
+** Interpret the result of a dynamic capture: false -> fail;
+** true -> keep current position; number -> next position.
+** Return new subject position. 'fr' is stack index where
+** is the result; 'curr' is current subject position; 'limit'
+** is subject's size.
+*/
+static int resdyncaptures (lua_State *L, int fr, int curr, int limit) {
+ lua_Integer res;
+ if (!lua_toboolean(L, fr)) { /* false value? */
+ lua_settop(L, fr - 1); /* remove results */
+ return -1; /* and fail */
+ }
+ else if (lua_isboolean(L, fr)) /* true? */
+ res = curr; /* keep current position */
+ else {
+ res = lua_tointeger(L, fr) - 1; /* new position */
+ if (res < curr || res > limit)
+ luaL_error(L, "invalid position returned by match-time capture");
+ }
+ lua_remove(L, fr); /* remove first result (offset) */
+ return res;
+}
+
+
+/*
+** Add capture values returned by a dynamic capture to the list
+** 'capture', nested inside a group. 'fd' indexes the first capture
+** value, 'n' is the number of values (at least 1). The open group
+** capture is already in 'capture', before the place for the new entries.
+*/
+static void adddyncaptures (const char *s, Capture *capture, int n, int fd) {
+ int i;
+ assert(capture[-1].kind == Cgroup && capture[-1].siz == 0);
+ capture[-1].idx = 0; /* make group capture an anonymous group */
+ for (i = 0; i < n; i++) { /* add runtime captures */
+ capture[i].kind = Cruntime;
+ capture[i].siz = 1; /* mark it as closed */
+ capture[i].idx = fd + i; /* stack index of capture value */
+ capture[i].s = s;
+ }
+ capture[n].kind = Cclose; /* close group */
+ capture[n].siz = 1;
+ capture[n].s = s;
+}
+
+
+/*
+** Remove dynamic captures from the Lua stack (called in case of failure)
+*/
+static int removedyncap (lua_State *L, Capture *capture,
+ int level, int last) {
+ int id = finddyncap(capture + level, capture + last); /* index of 1st cap. */
+ int top = lua_gettop(L);
+ if (id == 0) return 0; /* no dynamic captures? */
+ lua_settop(L, id - 1); /* remove captures */
+ return top - id + 1; /* number of values removed */
+}
+
+
+/*
+** Opcode interpreter
+*/
+const char *match (lua_State *L, const char *o, const char *s, const char *e,
+ Instruction *op, Capture *capture, int ptop) {
+ Stack stackbase[INITBACK];
+ Stack *stacklimit = stackbase + INITBACK;
+ Stack *stack = stackbase; /* point to first empty slot in stack */
+ int capsize = INITCAPSIZE;
+ int captop = 0; /* point to first empty slot in captures */
+ int ndyncap = 0; /* number of dynamic captures (in Lua stack) */
+ const Instruction *p = op; /* current instruction */
+ stack->p = &giveup; stack->s = s; stack->caplevel = 0; stack++;
+ lua_pushlightuserdata(L, stackbase);
+ for (;;) {
+#if defined(DEBUG)
+ printf("s: |%s| stck:%d, dyncaps:%d, caps:%d ",
+ s, (int)(stack - getstackbase(L, ptop)), ndyncap, captop);
+ printinst(op, p);
+#endif
+ assert(stackidx(ptop) + ndyncap == lua_gettop(L) && ndyncap <= captop);
+ switch ((Opcode)p->i.code) {
+ case IEnd: {
+ assert(stack == getstackbase(L, ptop) + 1);
+ capture[captop].kind = Cclose;
+ capture[captop].s = NULL;
+ return s;
+ }
+ case IGiveup: {
+ assert(stack == getstackbase(L, ptop));
+ return NULL;
+ }
+ case IRet: {
+ assert(stack > getstackbase(L, ptop) && (stack - 1)->s == NULL);
+ p = (--stack)->p;
+ continue;
+ }
+ case IAny: {
+ if (s < e) { p++; s++; }
+ else goto fail;
+ continue;
+ }
+ case ITestAny: {
+ if (s < e) p += 2;
+ else p += getoffset(p);
+ continue;
+ }
+ case IChar: {
+ if (s < e && (byte)*s == p->i.aux) { p++; s++; }
+ else goto fail;
+ continue;
+ }
+ case ITestChar: {
+ if (s < e && (byte)*s == p->i.aux) p += 2;
+ else p += getoffset(p);
+ continue;
+ }
+ case ISet: {
+ if (s < e) {
+ int c = (byte) *s;
+ if (testchar((p + 1)->buff, c)) {
+ p += CHARSETINSTSIZE;
+ s++;
+ }
+ else goto fail;
+ }
+ else {
+ goto fail;
+ }
+ continue;
+ }
+ case ITestSet: {
+ if (s < e) {
+ int c = (byte) *s;
+ if (testchar((p + 2)->buff, c))
+ p += 1 + CHARSETINSTSIZE;
+ else p += getoffset(p);
+ }
+ else {
+ p += getoffset(p);
+ }
+ continue;
+ }
+ case IBehind: {
+ int n = p->i.aux;
+ if (n > s - o) goto fail;
+ s -= n; p++;
+ continue;
+ }
+ case ISpan: {
+ for (; s < e; s++) {
+ int c = (byte)*s;
+ if (!testchar((p+1)->buff, c)) break;
+ }
+ p += CHARSETINSTSIZE;
+ continue;
+ }
+ case IJmp: {
+ p += getoffset(p);
+ continue;
+ }
+ case IChoice: {
+ if (stack == stacklimit)
+ stack = doublestack(L, &stacklimit, ptop);
+ stack->p = p + getoffset(p);
+ stack->s = s;
+ stack->caplevel = captop;
+ stack++;
+ p += 2;
+ continue;
+ }
+ case ICall: {
+ if (stack == stacklimit)
+ stack = doublestack(L, &stacklimit, ptop);
+ stack->s = NULL;
+ stack->p = p + 2; /* save return address */
+ stack++;
+ p += getoffset(p);
+ continue;
+ }
+ case ICommit: {
+ assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
+ stack--;
+ p += getoffset(p);
+ continue;
+ }
+ case IPartialCommit: {
+ assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
+ (stack - 1)->s = s;
+ (stack - 1)->caplevel = captop;
+ p += getoffset(p);
+ continue;
+ }
+ case IBackCommit: {
+ assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
+ s = (--stack)->s;
+ captop = stack->caplevel;
+ p += getoffset(p);
+ continue;
+ }
+ case IFailTwice:
+ assert(stack > getstackbase(L, ptop));
+ stack--;
+ /* go through */
+ case IFail:
+ fail: { /* pattern failed: try to backtrack */
+ do { /* remove pending calls */
+ assert(stack > getstackbase(L, ptop));
+ s = (--stack)->s;
+ } while (s == NULL);
+ if (ndyncap > 0) /* is there matchtime captures? */
+ ndyncap -= removedyncap(L, capture, stack->caplevel, captop);
+ captop = stack->caplevel;
+ p = stack->p;
+ continue;
+ }
+ case ICloseRunTime: {
+ CapState cs;
+ int rem, res, n;
+ int fr = lua_gettop(L) + 1; /* stack index of first result */
+ cs.reclevel = 0; cs.L = L;
+ cs.s = o; cs.ocap = capture; cs.ptop = ptop;
+ n = runtimecap(&cs, capture + captop, s, &rem); /* call function */
+ captop -= n; /* remove nested captures */
+ ndyncap -= rem; /* update number of dynamic captures */
+ fr -= rem; /* 'rem' items were popped from Lua stack */
+ res = resdyncaptures(L, fr, s - o, e - o); /* get result */
+ if (res == -1) /* fail? */
+ goto fail;
+ s = o + res; /* else update current position */
+ n = lua_gettop(L) - fr + 1; /* number of new captures */
+ ndyncap += n; /* update number of dynamic captures */
+ if (n == 0) /* no new captures? */
+ captop--; /* remove open group */
+ else { /* new captures; keep original open group */
+ if (fr + n >= SHRT_MAX)
+ luaL_error(L, "too many results in match-time capture");
+ /* add new captures + close group to 'capture' list */
+ capture = growcap(L, capture, &capsize, captop, n + 1, ptop);
+ adddyncaptures(s, capture + captop, n, fr);
+ captop += n + 1; /* new captures + close group */
+ }
+ p++;
+ continue;
+ }
+ case ICloseCapture: {
+ const char *s1 = s;
+ assert(captop > 0);
+ /* if possible, turn capture into a full capture */
+ if (capture[captop - 1].siz == 0 &&
+ s1 - capture[captop - 1].s < UCHAR_MAX) {
+ capture[captop - 1].siz = s1 - capture[captop - 1].s + 1;
+ p++;
+ continue;
+ }
+ else {
+ capture[captop].siz = 1; /* mark entry as closed */
+ capture[captop].s = s;
+ goto pushcapture;
+ }
+ }
+ case IOpenCapture:
+ capture[captop].siz = 0; /* mark entry as open */
+ capture[captop].s = s;
+ goto pushcapture;
+ case IFullCapture:
+ capture[captop].siz = getoff(p) + 1; /* save capture size */
+ capture[captop].s = s - getoff(p);
+ /* goto pushcapture; */
+ pushcapture: {
+ capture[captop].idx = p->i.key;
+ capture[captop].kind = getkind(p);
+ captop++;
+ capture = growcap(L, capture, &capsize, captop, 0, ptop);
+ p++;
+ continue;
+ }
+ default: assert(0); return NULL;
+ }
+ }
+
+}
+
+/* }====================================================== */
+
+
diff --git a/contrib/lua-lpeg/lpvm.h b/contrib/lua-lpeg/lpvm.h
new file mode 100644
index 0000000..757b9e1
--- /dev/null
+++ b/contrib/lua-lpeg/lpvm.h
@@ -0,0 +1,58 @@
+/*
+** $Id: lpvm.h,v 1.3 2014/02/21 13:06:41 roberto Exp $
+*/
+
+#if !defined(lpvm_h)
+#define lpvm_h
+
+#include "lpcap.h"
+
+
+/* Virtual Machine's instructions */
+typedef enum Opcode {
+ IAny, /* if no char, fail */
+ IChar, /* if char != aux, fail */
+ ISet, /* if char not in buff, fail */
+ ITestAny, /* in no char, jump to 'offset' */
+ ITestChar, /* if char != aux, jump to 'offset' */
+ ITestSet, /* if char not in buff, jump to 'offset' */
+ ISpan, /* read a span of chars in buff */
+ IBehind, /* walk back 'aux' characters (fail if not possible) */
+ IRet, /* return from a rule */
+ IEnd, /* end of pattern */
+ IChoice, /* stack a choice; next fail will jump to 'offset' */
+ IJmp, /* jump to 'offset' */
+ ICall, /* call rule at 'offset' */
+ IOpenCall, /* call rule number 'key' (must be closed to a ICall) */
+ ICommit, /* pop choice and jump to 'offset' */
+ IPartialCommit, /* update top choice to current position and jump */
+ IBackCommit, /* "fails" but jump to its own 'offset' */
+ IFailTwice, /* pop one choice and then fail */
+ IFail, /* go back to saved state on choice and jump to saved offset */
+ IGiveup, /* internal use */
+ IFullCapture, /* complete capture of last 'off' chars */
+ IOpenCapture, /* start a capture */
+ ICloseCapture,
+ ICloseRunTime
+} Opcode;
+
+
+
+typedef union Instruction {
+ struct Inst {
+ byte code;
+ byte aux;
+ short key;
+ } i;
+ int offset;
+ byte buff[1];
+} Instruction;
+
+
+void printpatt (Instruction *p, int n);
+const char *match (lua_State *L, const char *o, const char *s, const char *e,
+ Instruction *op, Capture *capture, int ptop);
+
+
+#endif
+
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