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-rw-r--r--userdiff.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/userdiff.c b/userdiff.c
new file mode 100644
index 0000000..151d9a5
--- /dev/null
+++ b/userdiff.c
@@ -0,0 +1,476 @@
+#include "cache.h"
+#include "config.h"
+#include "userdiff.h"
+#include "attr.h"
+
+static struct userdiff_driver *drivers;
+static int ndrivers;
+static int drivers_alloc;
+
+#define PATTERNS(lang, rx, wrx) { \
+ .name = lang, \
+ .binary = -1, \
+ .funcname = { \
+ .pattern = rx, \
+ .cflags = REG_EXTENDED, \
+ }, \
+ .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \
+}
+#define IPATTERN(lang, rx, wrx) { \
+ .name = lang, \
+ .binary = -1, \
+ .funcname = { \
+ .pattern = rx, \
+ .cflags = REG_EXTENDED | REG_ICASE, \
+ }, \
+ .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \
+}
+
+/*
+ * Built-in drivers for various languages, sorted by their names
+ * (except that the "default" is left at the end).
+ *
+ * When writing or updating patterns, assume that the contents these
+ * patterns are applied to are syntactically correct. The patterns
+ * can be simple without implementing all syntactical corner cases, as
+ * long as they are sufficiently permissive.
+ */
+static struct userdiff_driver builtin_drivers[] = {
+IPATTERN("ada",
+ "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
+ "!^[ \t]*with[ \t].*$\n"
+ "^[ \t]*((procedure|function)[ \t]+.*)$\n"
+ "^[ \t]*((package|protected|task)[ \t]+.*)$",
+ /* -- */
+ "[a-zA-Z][a-zA-Z0-9_]*"
+ "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
+ "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
+PATTERNS("bash",
+ /* Optional leading indentation */
+ "^[ \t]*"
+ /* Start of captured text */
+ "("
+ "("
+ /* POSIX identifier with mandatory parentheses */
+ "[a-zA-Z_][a-zA-Z0-9_]*[ \t]*\\([ \t]*\\))"
+ "|"
+ /* Bashism identifier with optional parentheses */
+ "(function[ \t]+[a-zA-Z_][a-zA-Z0-9_]*(([ \t]*\\([ \t]*\\))|([ \t]+))"
+ ")"
+ /* Optional whitespace */
+ "[ \t]*"
+ /* Compound command starting with `{`, `(`, `((` or `[[` */
+ "(\\{|\\(\\(?|\\[\\[)"
+ /* End of captured text */
+ ")",
+ /* -- */
+ /* Characters not in the default $IFS value */
+ "[^ \t]+"),
+PATTERNS("bibtex",
+ "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
+ /* -- */
+ "[={}\"]|[^={}\" \t]+"),
+PATTERNS("cpp",
+ /* Jump targets or access declarations */
+ "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
+ /* functions/methods, variables, and compounds at top level */
+ "^((::[[:space:]]*)?[A-Za-z_].*)$",
+ /* -- */
+ /* identifiers and keywords */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ /* decimal and octal integers as well as floatingpoint numbers */
+ "|[0-9][0-9.]*([Ee][-+]?[0-9]+)?[fFlLuU]*"
+ /* hexadecimal and binary integers */
+ "|0[xXbB][0-9a-fA-F]+[lLuU]*"
+ /* floatingpoint numbers that begin with a decimal point */
+ "|\\.[0-9][0-9]*([Ee][-+]?[0-9]+)?[fFlL]?"
+ "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*|<=>"),
+PATTERNS("csharp",
+ /* Keywords */
+ "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
+ /* Methods and constructors */
+ "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
+ /* Properties */
+ "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
+ /* Type definitions */
+ "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct|record)[ \t]+.*)$\n"
+ /* Namespace */
+ "^[ \t]*(namespace[ \t]+.*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
+ "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
+IPATTERN("css",
+ "![:;][[:space:]]*$\n"
+ "^[:[@.#]?[_a-z0-9].*$",
+ /* -- */
+ /*
+ * This regex comes from W3C CSS specs. Should theoretically also
+ * allow ISO 10646 characters U+00A0 and higher,
+ * but they are not handled in this regex.
+ */
+ "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
+ "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
+),
+PATTERNS("dts",
+ "!;\n"
+ "!=\n"
+ /* lines beginning with a word optionally preceded by '&' or the root */
+ "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)",
+ /* -- */
+ /* Property names and math operators */
+ "[a-zA-Z0-9,._+?#-]+"
+ "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"),
+PATTERNS("elixir",
+ "^[ \t]*((def(macro|module|impl|protocol|p)?|test)[ \t].*)$",
+ /* -- */
+ /* Atoms, names, and module attributes */
+ "[@:]?[a-zA-Z0-9@_?!]+"
+ /* Numbers with specific base */
+ "|[-+]?0[xob][0-9a-fA-F]+"
+ /* Numbers */
+ "|[-+]?[0-9][0-9_.]*([eE][-+]?[0-9_]+)?"
+ /* Operators and atoms that represent them */
+ "|:?(\\+\\+|--|\\.\\.|~~~|<>|\\^\\^\\^|<?\\|>|<<<?|>?>>|<<?~|~>?>|<~>|<=|>=|===?|!==?|=~|&&&?|\\|\\|\\|?|=>|<-|\\\\\\\\|->)"
+ /* Not real operators, but should be grouped */
+ "|:?%[A-Za-z0-9_.]\\{\\}?"),
+IPATTERN("fortran",
+ /* Don't match comment lines */
+ "!^([C*]|[ \t]*!)\n"
+ /* Don't match 'module procedure' lines */
+ "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
+ /* Program, module, block data */
+ "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
+ /* Subroutines and functions */
+ "|([^!'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
+ /* -- */
+ "[a-zA-Z][a-zA-Z0-9_]*"
+ "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
+ /* numbers and format statements like 2E14.4, or ES12.6, 9X.
+ * Don't worry about format statements without leading digits since
+ * they would have been matched above as a variable anyway. */
+ "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
+ "|//|\\*\\*|::|[/<>=]="),
+IPATTERN("fountain",
+ "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
+ /* -- */
+ "[^ \t-]+"),
+PATTERNS("golang",
+ /* Functions */
+ "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
+ /* Structs and interfaces */
+ "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
+ "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
+PATTERNS("html",
+ "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
+ /* -- */
+ "[^<>= \t]+"),
+PATTERNS("java",
+ "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
+ /* Class, enum, and interface declarations */
+ "^[ \t]*(([a-z]+[ \t]+)*(class|enum|interface)[ \t]+[A-Za-z][A-Za-z0-9_$]*[ \t]+.*)$\n"
+ /* Method definitions; note that constructor signatures are not */
+ /* matched because they are indistinguishable from method calls. */
+ "^[ \t]*(([A-Za-z_<>&][][?&<>.,A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
+ "|[-+*/<>%&^|=!]="
+ "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
+PATTERNS("kotlin",
+ "^[ \t]*(([a-z]+[ \t]+)*(fun|class|interface)[ \t]+.*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ /* hexadecimal and binary numbers */
+ "|0[xXbB][0-9a-fA-F_]+[lLuU]*"
+ /* integers and floats */
+ "|[0-9][0-9_]*([.][0-9_]*)?([Ee][-+]?[0-9]+)?[fFlLuU]*"
+ /* floating point numbers beginning with decimal point */
+ "|[.][0-9][0-9_]*([Ee][-+]?[0-9]+)?[fFlLuU]?"
+ /* unary and binary operators */
+ "|[-+*/<>%&^|=!]==?|--|\\+\\+|<<=|>>=|&&|\\|\\||->|\\.\\*|!!|[?:.][.:]"),
+PATTERNS("markdown",
+ "^ {0,3}#{1,6}[ \t].*",
+ /* -- */
+ "[^<>= \t]+"),
+PATTERNS("matlab",
+ /*
+ * Octave pattern is mostly the same as matlab, except that '%%%' and
+ * '##' can also be used to begin code sections, in addition to '%%'
+ * that is understood by both.
+ */
+ "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
+PATTERNS("objc",
+ /* Negate C statements that can look like functions */
+ "!^[ \t]*(do|for|if|else|return|switch|while)\n"
+ /* Objective-C methods */
+ "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
+ /* C functions */
+ "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
+ /* Objective-C class/protocol definitions */
+ "^(@(implementation|interface|protocol)[ \t].*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
+ "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
+PATTERNS("pascal",
+ "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface"
+ "|implementation|initialization|finalization)[ \t]*.*)$\n"
+ "^(.*=[ \t]*(class|record).*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
+ "|<>|<=|>=|:=|\\.\\."),
+PATTERNS("perl",
+ "^package .*\n"
+ "^sub [[:alnum:]_':]+[ \t]*"
+ "(\\([^)]*\\)[ \t]*)?" /* prototype */
+ /*
+ * Attributes. A regex can't count nested parentheses,
+ * so just slurp up whatever we see, taking care not
+ * to accept lines like "sub foo; # defined elsewhere".
+ *
+ * An attribute could contain a semicolon, but at that
+ * point it seems reasonable enough to give up.
+ */
+ "(:[^;#]*)?"
+ "(\\{[ \t]*)?" /* brace can come here or on the next line */
+ "(#.*)?$\n" /* comment */
+ "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
+ "(\\{[ \t]*)?" /* brace can come here or on the next line */
+ "(#.*)?$\n"
+ "^=head[0-9] .*", /* POD */
+ /* -- */
+ "[[:alpha:]_'][[:alnum:]_']*"
+ "|0[xb]?[0-9a-fA-F_]*"
+ /* taking care not to interpret 3..5 as (3.)(.5) */
+ "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
+ "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
+ "|&&=|\\|\\|=|//=|\\*\\*="
+ "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
+ "|[-+*/%.^&<>=!|]="
+ "|=~|!~"
+ "|<<|<>|<=>|>>"),
+PATTERNS("php",
+ "^[\t ]*(((public|protected|private|static|abstract|final)[\t ]+)*function.*)$\n"
+ "^[\t ]*((((final|abstract)[\t ]+)?class|enum|interface|trait).*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
+ "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
+PATTERNS("python",
+ "^[ \t]*((class|(async[ \t]+)?def)[ \t].*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
+ "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
+ /* -- */
+PATTERNS("ruby",
+ "^[ \t]*((class|module|def)[ \t].*)$",
+ /* -- */
+ "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
+ "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
+PATTERNS("rust",
+ "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl|macro_rules!)[< \t]+[^;]*)$",
+ /* -- */
+ "[a-zA-Z_][a-zA-Z0-9_]*"
+ "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
+ "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
+PATTERNS("scheme",
+ "^[\t ]*(\\(((define|def(struct|syntax|class|method|rules|record|proto|alias)?)[-*/ \t]|(library|module|struct|class)[*+ \t]).*)$",
+ /*
+ * R7RS valid identifiers include any sequence enclosed
+ * within vertical lines having no backslashes
+ */
+ "\\|([^\\\\]*)\\|"
+ /* All other words should be delimited by spaces or parentheses */
+ "|([^][)(}{[ \t])+"),
+PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
+ "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
+{ "default", NULL, -1, { NULL, 0 } },
+};
+#undef PATTERNS
+#undef IPATTERN
+
+static struct userdiff_driver driver_true = {
+ .name = "diff=true",
+ .binary = 0,
+};
+
+static struct userdiff_driver driver_false = {
+ .name = "!diff",
+ .binary = 1,
+};
+
+struct find_by_namelen_data {
+ const char *name;
+ size_t len;
+ struct userdiff_driver *driver;
+};
+
+static int userdiff_find_by_namelen_cb(struct userdiff_driver *driver,
+ enum userdiff_driver_type type, void *priv)
+{
+ struct find_by_namelen_data *cb_data = priv;
+
+ if (!strncmp(driver->name, cb_data->name, cb_data->len) &&
+ !driver->name[cb_data->len]) {
+ cb_data->driver = driver;
+ return 1; /* tell the caller to stop iterating */
+ }
+ return 0;
+}
+
+static struct userdiff_driver *userdiff_find_by_namelen(const char *name, size_t len)
+{
+ struct find_by_namelen_data udcbdata = {
+ .name = name,
+ .len = len,
+ };
+ for_each_userdiff_driver(userdiff_find_by_namelen_cb, &udcbdata);
+ return udcbdata.driver;
+}
+
+static int parse_funcname(struct userdiff_funcname *f, const char *k,
+ const char *v, int cflags)
+{
+ if (git_config_string(&f->pattern, k, v) < 0)
+ return -1;
+ f->cflags = cflags;
+ return 0;
+}
+
+static int parse_tristate(int *b, const char *k, const char *v)
+{
+ if (v && !strcasecmp(v, "auto"))
+ *b = -1;
+ else
+ *b = git_config_bool(k, v);
+ return 0;
+}
+
+static int parse_bool(int *b, const char *k, const char *v)
+{
+ *b = git_config_bool(k, v);
+ return 0;
+}
+
+int userdiff_config(const char *k, const char *v)
+{
+ struct userdiff_driver *drv;
+ const char *name, *type;
+ size_t namelen;
+
+ if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
+ return 0;
+
+ drv = userdiff_find_by_namelen(name, namelen);
+ if (!drv) {
+ ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
+ drv = &drivers[ndrivers++];
+ memset(drv, 0, sizeof(*drv));
+ drv->name = xmemdupz(name, namelen);
+ drv->binary = -1;
+ }
+
+ if (!strcmp(type, "funcname"))
+ return parse_funcname(&drv->funcname, k, v, 0);
+ if (!strcmp(type, "xfuncname"))
+ return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
+ if (!strcmp(type, "binary"))
+ return parse_tristate(&drv->binary, k, v);
+ if (!strcmp(type, "command"))
+ return git_config_string(&drv->external, k, v);
+ if (!strcmp(type, "textconv"))
+ return git_config_string(&drv->textconv, k, v);
+ if (!strcmp(type, "cachetextconv"))
+ return parse_bool(&drv->textconv_want_cache, k, v);
+ if (!strcmp(type, "wordregex"))
+ return git_config_string(&drv->word_regex, k, v);
+
+ return 0;
+}
+
+struct userdiff_driver *userdiff_find_by_name(const char *name)
+{
+ int len = strlen(name);
+ return userdiff_find_by_namelen(name, len);
+}
+
+struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
+ const char *path)
+{
+ static struct attr_check *check;
+
+ if (!check)
+ check = attr_check_initl("diff", NULL);
+ if (!path)
+ return NULL;
+ git_check_attr(istate, path, check);
+
+ if (ATTR_TRUE(check->items[0].value))
+ return &driver_true;
+ if (ATTR_FALSE(check->items[0].value))
+ return &driver_false;
+ if (ATTR_UNSET(check->items[0].value))
+ return NULL;
+ return userdiff_find_by_name(check->items[0].value);
+}
+
+struct userdiff_driver *userdiff_get_textconv(struct repository *r,
+ struct userdiff_driver *driver)
+{
+ if (!driver->textconv)
+ return NULL;
+
+ if (driver->textconv_want_cache && !driver->textconv_cache) {
+ struct notes_cache *c = xmalloc(sizeof(*c));
+ struct strbuf name = STRBUF_INIT;
+
+ strbuf_addf(&name, "textconv/%s", driver->name);
+ notes_cache_init(r, c, name.buf, driver->textconv);
+ driver->textconv_cache = c;
+ strbuf_release(&name);
+ }
+
+ return driver;
+}
+
+static int for_each_userdiff_driver_list(each_userdiff_driver_fn fn,
+ enum userdiff_driver_type type, void *cb_data,
+ struct userdiff_driver *drv,
+ int drv_size)
+{
+ int i;
+ int ret;
+ for (i = 0; i < drv_size; i++) {
+ struct userdiff_driver *item = drv + i;
+ if ((ret = fn(item, type, cb_data)))
+ return ret;
+ }
+ return 0;
+}
+
+int for_each_userdiff_driver(each_userdiff_driver_fn fn, void *cb_data)
+{
+ int ret;
+
+ ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_CUSTOM,
+ cb_data, drivers, ndrivers);
+ if (ret)
+ return ret;
+
+ ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_BUILTIN,
+ cb_data, builtin_drivers,
+ ARRAY_SIZE(builtin_drivers));
+ if (ret)
+ return ret;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 18:42:50 +0000