Adding upstream version 2:9.1.0016.upstream/2%9.1.0016

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 191 insertions, 0 deletions

diff --git a/src/regexp.h b/src/regexp.h
new file mode 100644
index 0000000..1ff2e1b
--- /dev/null
+++ b/src/regexp.h
@@ -0,0 +1,191 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+ *
+ * This is NOT the original regular expression code as written by Henry
+ * Spencer.  This code has been modified specifically for use with Vim, and
+ * should not be used apart from compiling Vim.  If you want a good regular
+ * expression library, get the original code.
+ *
+ * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+ */
+
+#ifndef _REGEXP_H
+#define _REGEXP_H
+
+/*
+ * The number of sub-matches is limited to 10.
+ * The first one (index 0) is the whole match, referenced with "\0".
+ * The second one (index 1) is the first sub-match, referenced with "\1".
+ * This goes up to the tenth (index 9), referenced with "\9".
+ */
+#define NSUBEXP  10
+
+/*
+ * In the NFA engine: how many braces are allowed.
+ * TODO(RE): Use dynamic memory allocation instead of static, like here
+ */
+#define NFA_MAX_BRACES 20
+
+/*
+ * In the NFA engine: how many states are allowed
+ */
+#define NFA_MAX_STATES 100000
+#define NFA_TOO_EXPENSIVE (-1)
+
+// Which regexp engine to use? Needed for vim_regcomp().
+// Must match with 'regexpengine'.
+#define	    AUTOMATIC_ENGINE	0
+#define	    BACKTRACKING_ENGINE	1
+#define	    NFA_ENGINE		2
+
+typedef struct regengine regengine_T;
+
+/*
+ * Structure returned by vim_regcomp() to pass on to vim_regexec().
+ * This is the general structure. For the actual matcher, two specific
+ * structures are used. See code below.
+ */
+typedef struct regprog
+{
+    regengine_T		*engine;
+    unsigned		regflags;
+    unsigned		re_engine;   // automatic, backtracking or nfa engine
+    unsigned		re_flags;    // second argument for vim_regcomp()
+    int			re_in_use;   // prog is being executed
+} regprog_T;
+
+/*
+ * Structure used by the back track matcher.
+ * These fields are only to be used in regexp.c!
+ * See regexp.c for an explanation.
+ */
+typedef struct
+{
+    // These four members implement regprog_T
+    regengine_T		*engine;
+    unsigned		regflags;
+    unsigned		re_engine;
+    unsigned		re_flags;
+    int			re_in_use;
+
+    int			regstart;
+    char_u		reganch;
+    char_u		*regmust;
+    int			regmlen;
+#ifdef FEAT_SYN_HL
+    char_u		reghasz;
+#endif
+    char_u		program[1];	// actually longer..
+} bt_regprog_T;
+
+/*
+ * Structure representing a NFA state.
+ * An NFA state may have no outgoing edge, when it is a NFA_MATCH state.
+ */
+typedef struct nfa_state nfa_state_T;
+struct nfa_state
+{
+    int			c;
+    nfa_state_T		*out;
+    nfa_state_T		*out1;
+    int			id;
+    int			lastlist[2]; // 0: normal, 1: recursive
+    int			val;
+};
+
+/*
+ * Structure used by the NFA matcher.
+ */
+typedef struct
+{
+    // These three members implement regprog_T
+    regengine_T		*engine;
+    unsigned		regflags;
+    unsigned		re_engine;
+    unsigned		re_flags;
+    int			re_in_use;
+
+    nfa_state_T		*start;		// points into state[]
+
+    int			reganch;	// pattern starts with ^
+    int			regstart;	// char at start of pattern
+    char_u		*match_text;	// plain text to match with
+
+    int			has_zend;	// pattern contains \ze
+    int			has_backref;	// pattern contains \1 .. \9
+#ifdef FEAT_SYN_HL
+    int			reghasz;
+#endif
+    char_u		*pattern;
+    int			nsubexp;	// number of ()
+    int			nstate;
+    nfa_state_T		state[1];	// actually longer..
+} nfa_regprog_T;
+
+/*
+ * Structure to be used for single-line matching.
+ * Sub-match "no" starts at "startp[no]" and ends just before "endp[no]".
+ * When there is no match, the pointer is NULL.
+ */
+typedef struct
+{
+    regprog_T		*regprog;
+    char_u		*startp[NSUBEXP];
+    char_u		*endp[NSUBEXP];
+
+    colnr_T		rm_matchcol;   // match start without "\zs"
+    int			rm_ic;
+} regmatch_T;
+
+/*
+ * Structure to be used for multi-line matching.
+ * Sub-match "no" starts in line "startpos[no].lnum" column "startpos[no].col"
+ * and ends in line "endpos[no].lnum" just before column "endpos[no].col".
+ * The line numbers are relative to the first line, thus startpos[0].lnum is
+ * always 0.
+ * When there is no match, the line number is -1.
+ */
+typedef struct
+{
+    regprog_T		*regprog;
+    lpos_T		startpos[NSUBEXP];
+    lpos_T		endpos[NSUBEXP];
+
+    colnr_T		rmm_matchcol;   // match start without "\zs"
+    int			rmm_ic;
+    colnr_T		rmm_maxcol;	// when not zero: maximum column
+} regmmatch_T;
+
+/*
+ * Structure used to store external references: "\z\(\)" to "\z\1".
+ * Use a reference count to avoid the need to copy this around.  When it goes
+ * from 1 to zero the matches need to be freed.
+ */
+typedef struct
+{
+    short		refcnt;
+    char_u		*matches[NSUBEXP];
+} reg_extmatch_T;
+
+struct regengine
+{
+    // bt_regcomp or nfa_regcomp
+    regprog_T	*(*regcomp)(char_u*, int);
+    // bt_regfree or nfa_regfree
+    void	(*regfree)(regprog_T *);
+    // bt_regexec_nl or nfa_regexec_nl
+    int		(*regexec_nl)(regmatch_T *, char_u *, colnr_T, int);
+    // bt_regexec_mult or nfa_regexec_mult
+    long	(*regexec_multi)(regmmatch_T *, win_T *, buf_T *, linenr_T, colnr_T, int *);
+#ifdef DEBUG
+    char_u	*expr;
+#endif
+};
+
+// Flags used by vim_regsub() and vim_regsub_both()
+#define REGSUB_COPY	    1
+#define REGSUB_MAGIC	    2
+#define REGSUB_BACKSLASH    4
+
+#endif	// _REGEXP_H