userdiff.c

   1 #include "cache.h"
   2 #include "userdiff.h"
   3 #include "attr.h"
   4
   5 static struct userdiff_driver *drivers;
   6 static int ndrivers;
   7 static int drivers_alloc;
   8
   9 #define PATTERNS(name, pattern, word_regex)                     \
  10         { name, NULL, -1, { pattern, REG_EXTENDED },            \
  11           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  12 #define IPATTERN(name, pattern, word_regex)                     \
  13         { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
  14           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  15 static struct userdiff_driver builtin_drivers[] = {
  16 IPATTERN("ada",
  17          "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
  18          "!^[ \t]*with[ \t].*$\n"
  19          "^[ \t]*((procedure|function)[ \t]+.*)$\n"
  20          "^[ \t]*((package|protected|task)[ \t]+.*)$",
  21          /* -- */
  22          "[a-zA-Z][a-zA-Z0-9_]*"
  23          "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
  24          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
  25 IPATTERN("fortran",
  26          "!^([C*]|[ \t]*!)\n"
  27          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  28          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  29                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  30          /* -- */
  31          "[a-zA-Z][a-zA-Z0-9_]*"
  32          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  33          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  34           * Don't worry about format statements without leading digits since
  35           * they would have been matched above as a variable anyway. */
  36          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  37          "|//|\\*\\*|::|[/<>=]="),
  38 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  39          "[^<>= \t]+"),
  40 PATTERNS("java",
  41          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  42          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  43          /* -- */
  44          "[a-zA-Z_][a-zA-Z0-9_]*"
  45          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  46          "|[-+*/<>%&^|=!]="
  47          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  48 PATTERNS("matlab",
  49          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  50          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  51 PATTERNS("objc",
  52          /* Negate C statements that can look like functions */
  53          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  54          /* Objective-C methods */
  55          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  56          /* C functions */
  57          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  58          /* Objective-C class/protocol definitions */
  59          "^(@(implementation|interface|protocol)[ \t].*)$",
  60          /* -- */
  61          "[a-zA-Z_][a-zA-Z0-9_]*"
  62          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  63          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  64 PATTERNS("pascal",
  65          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  66                 "implementation|initialization|finalization)[ \t]*.*)$"
  67          "\n"
  68          "^(.*=[ \t]*(class|record).*)$",
  69          /* -- */
  70          "[a-zA-Z_][a-zA-Z0-9_]*"
  71          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  72          "|<>|<=|>=|:=|\\.\\."),
  73 PATTERNS("perl",
  74          "^package .*\n"
  75          "^sub [[:alnum:]_':]+[ \t]*"
  76                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
  77                 /*
  78                  * Attributes.  A regex can't count nested parentheses,
  79                  * so just slurp up whatever we see, taking care not
  80                  * to accept lines like "sub foo; # defined elsewhere".
  81                  *
  82                  * An attribute could contain a semicolon, but at that
  83                  * point it seems reasonable enough to give up.
  84                  */
  85                 "(:[^;#]*)?"
  86                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
  87                 "(#.*)?$\n" /* comment */
  88          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
  89                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
  90                 "(#.*)?$\n"
  91          "^=head[0-9] .*",      /* POD */
  92          /* -- */
  93          "[[:alpha:]_'][[:alnum:]_']*"
  94          "|0[xb]?[0-9a-fA-F_]*"
  95          /* taking care not to interpret 3..5 as (3.)(.5) */
  96          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
  97          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
  98          "|&&=|\\|\\|=|//=|\\*\\*="
  99          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 100          "|[-+*/%.^&<>=!|]="
 101          "|=~|!~"
 102          "|<<|<>|<=>|>>"),
 103 PATTERNS("php",
 104          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 105          "^[\t ]*(class.*)$",
 106          /* -- */
 107          "[a-zA-Z_][a-zA-Z0-9_]*"
 108          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 109          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 110 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 111          /* -- */
 112          "[a-zA-Z_][a-zA-Z0-9_]*"
 113          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 114          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 115          /* -- */
 116 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 117          /* -- */
 118          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 119          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 120          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 121 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 122          "[={}\"]|[^={}\" \t]+"),
 123 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 124          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 125 PATTERNS("cpp",
 126          /* Jump targets or access declarations */
 127          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 128          /* functions/methods, variables, and compounds at top level */
 129          "^((::[[:space:]]*)?[A-Za-z_].*)$",
 130          /* -- */
 131          "[a-zA-Z_][a-zA-Z0-9_]*"
 132          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 133          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 134 PATTERNS("csharp",
 135          /* Keywords */
 136          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 137          /* Methods and constructors */
 138          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 139          /* Properties */
 140          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 141          /* Type definitions */
 142          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 143          /* Namespace */
 144          "^[ \t]*(namespace[ \t]+.*)$",
 145          /* -- */
 146          "[a-zA-Z_][a-zA-Z0-9_]*"
 147          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 148          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 149 { "default", NULL, -1, { NULL, 0 } },
 150 };
 151 #undef PATTERNS
 152 #undef IPATTERN
 153
 154 static struct userdiff_driver driver_true = {
 155         "diff=true",
 156         NULL,
 157         0,
 158         { NULL, 0 }
 159 };
 160
 161 static struct userdiff_driver driver_false = {
 162         "!diff",
 163         NULL,
 164         1,
 165         { NULL, 0 }
 166 };
 167
 168 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 169 {
 170         int i;
 171         for (i = 0; i < ndrivers; i++) {
 172                 struct userdiff_driver *drv = drivers + i;
 173                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 174                         return drv;
 175         }
 176         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 177                 struct userdiff_driver *drv = builtin_drivers + i;
 178                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 179                         return drv;
 180         }
 181         return NULL;
 182 }
 183
 184 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 185                 const char *v, int cflags)
 186 {
 187         if (git_config_string(&f->pattern, k, v) < 0)
 188                 return -1;
 189         f->cflags = cflags;
 190         return 0;
 191 }
 192
 193 static int parse_tristate(int *b, const char *k, const char *v)
 194 {
 195         if (v && !strcasecmp(v, "auto"))
 196                 *b = -1;
 197         else
 198                 *b = git_config_bool(k, v);
 199         return 0;
 200 }
 201
 202 static int parse_bool(int *b, const char *k, const char *v)
 203 {
 204         *b = git_config_bool(k, v);
 205         return 0;
 206 }
 207
 208 int userdiff_config(const char *k, const char *v)
 209 {
 210         struct userdiff_driver *drv;
 211         const char *name, *type;
 212         int namelen;
 213
 214         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 215                 return 0;
 216
 217         drv = userdiff_find_by_namelen(name, namelen);
 218         if (!drv) {
 219                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 220                 drv = &drivers[ndrivers++];
 221                 memset(drv, 0, sizeof(*drv));
 222                 drv->name = xmemdupz(name, namelen);
 223                 drv->binary = -1;
 224         }
 225
 226         if (!strcmp(type, "funcname"))
 227                 return parse_funcname(&drv->funcname, k, v, 0);
 228         if (!strcmp(type, "xfuncname"))
 229                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 230         if (!strcmp(type, "binary"))
 231                 return parse_tristate(&drv->binary, k, v);
 232         if (!strcmp(type, "command"))
 233                 return git_config_string(&drv->external, k, v);
 234         if (!strcmp(type, "textconv"))
 235                 return git_config_string(&drv->textconv, k, v);
 236         if (!strcmp(type, "cachetextconv"))
 237                 return parse_bool(&drv->textconv_want_cache, k, v);
 238         if (!strcmp(type, "wordregex"))
 239                 return git_config_string(&drv->word_regex, k, v);
 240
 241         return 0;
 242 }
 243
 244 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 245         int len = strlen(name);
 246         return userdiff_find_by_namelen(name, len);
 247 }
 248
 249 struct userdiff_driver *userdiff_find_by_path(const char *path)
 250 {
 251         static struct git_attr *attr;
 252         struct git_attr_check check;
 253
 254         if (!attr)
 255                 attr = git_attr("diff");
 256         check.attr = attr;
 257
 258         if (!path)
 259                 return NULL;
 260         if (git_check_attr(path, 1, &check))
 261                 return NULL;
 262
 263         if (ATTR_TRUE(check.value))
 264                 return &driver_true;
 265         if (ATTR_FALSE(check.value))
 266                 return &driver_false;
 267         if (ATTR_UNSET(check.value))
 268                 return NULL;
 269         return userdiff_find_by_name(check.value);
 270 }
 271
 272 struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 273 {
 274         if (!driver->textconv)
 275                 return NULL;
 276
 277         if (driver->textconv_want_cache && !driver->textconv_cache) {
 278                 struct notes_cache *c = xmalloc(sizeof(*c));
 279                 struct strbuf name = STRBUF_INIT;
 280
 281                 strbuf_addf(&name, "textconv/%s", driver->name);
 282                 notes_cache_init(c, name.buf, driver->textconv);
 283                 driver->textconv_cache = c;
 284         }
 285
 286         return driver;
 287 }