userdiff.c

   1 #include "cache.h"
   2 #include "userdiff.h"
   3 #include "cache.h"
   4 #include "attr.h"
   5
   6 static struct userdiff_driver *drivers;
   7 static int ndrivers;
   8 static int drivers_alloc;
   9
  10 #define PATTERNS(name, pattern, word_regex)                     \
  11         { name, NULL, -1, { pattern, REG_EXTENDED },            \
  12           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  13 #define IPATTERN(name, pattern, word_regex)                     \
  14         { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
  15           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  16 static struct userdiff_driver builtin_drivers[] = {
  17 IPATTERN("fortran",
  18          "!^([C*]|[ \t]*!)\n"
  19          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  20          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  21                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  22          /* -- */
  23          "[a-zA-Z][a-zA-Z0-9_]*"
  24          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  25          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  26           * Don't worry about format statements without leading digits since
  27           * they would have been matched above as a variable anyway. */
  28          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  29          "|//|\\*\\*|::|[/<>=]="),
  30 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  31          "[^<>= \t]+"),
  32 PATTERNS("java",
  33          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  34          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  35          /* -- */
  36          "[a-zA-Z_][a-zA-Z0-9_]*"
  37          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  38          "|[-+*/<>%&^|=!]="
  39          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  40 PATTERNS("matlab",
  41          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  42          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  43 PATTERNS("objc",
  44          /* Negate C statements that can look like functions */
  45          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  46          /* Objective-C methods */
  47          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  48          /* C functions */
  49          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  50          /* Objective-C class/protocol definitions */
  51          "^(@(implementation|interface|protocol)[ \t].*)$",
  52          /* -- */
  53          "[a-zA-Z_][a-zA-Z0-9_]*"
  54          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  55          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  56 PATTERNS("pascal",
  57          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  58                 "implementation|initialization|finalization)[ \t]*.*)$"
  59          "\n"
  60          "^(.*=[ \t]*(class|record).*)$",
  61          /* -- */
  62          "[a-zA-Z_][a-zA-Z0-9_]*"
  63          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  64          "|<>|<=|>=|:=|\\.\\."),
  65 PATTERNS("perl",
  66          "^package .*\n"
  67          "^sub [[:alnum:]_':]+[ \t]*"
  68                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
  69                 /*
  70                  * Attributes.  A regex can't count nested parentheses,
  71                  * so just slurp up whatever we see, taking care not
  72                  * to accept lines like "sub foo; # defined elsewhere".
  73                  *
  74                  * An attribute could contain a semicolon, but at that
  75                  * point it seems reasonable enough to give up.
  76                  */
  77                 "(:[^;#]*)?"
  78                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
  79                 "(#.*)?$\n" /* comment */
  80          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
  81                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
  82                 "(#.*)?$\n"
  83          "^=head[0-9] .*",      /* POD */
  84          /* -- */
  85          "[[:alpha:]_'][[:alnum:]_']*"
  86          "|0[xb]?[0-9a-fA-F_]*"
  87          /* taking care not to interpret 3..5 as (3.)(.5) */
  88          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
  89          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
  90          "|&&=|\\|\\|=|//=|\\*\\*="
  91          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
  92          "|[-+*/%.^&<>=!|]="
  93          "|=~|!~"
  94          "|<<|<>|<=>|>>"),
  95 PATTERNS("php",
  96          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
  97          "^[\t ]*(class.*)$",
  98          /* -- */
  99          "[a-zA-Z_][a-zA-Z0-9_]*"
 100          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 101          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 102 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 103          /* -- */
 104          "[a-zA-Z_][a-zA-Z0-9_]*"
 105          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 106          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 107          /* -- */
 108 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 109          /* -- */
 110          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 111          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 112          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 113 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 114          "[={}\"]|[^={}\" \t]+"),
 115 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 116          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 117 PATTERNS("cpp",
 118          /* Jump targets or access declarations */
 119          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
 120          /* C/++ functions/methods at top level */
 121          "^([A-Za-z_][A-Za-z_0-9]*([ \t*]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
 122          /* compound type at top level */
 123          "^((struct|class|enum)[^;]*)$",
 124          /* -- */
 125          "[a-zA-Z_][a-zA-Z0-9_]*"
 126          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 127          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 128 PATTERNS("csharp",
 129          /* Keywords */
 130          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 131          /* Methods and constructors */
 132          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 133          /* Properties */
 134          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 135          /* Type definitions */
 136          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 137          /* Namespace */
 138          "^[ \t]*(namespace[ \t]+.*)$",
 139          /* -- */
 140          "[a-zA-Z_][a-zA-Z0-9_]*"
 141          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 142          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 143 { "default", NULL, -1, { NULL, 0 } },
 144 };
 145 #undef PATTERNS
 146 #undef IPATTERN
 147
 148 static struct userdiff_driver driver_true = {
 149         "diff=true",
 150         NULL,
 151         0,
 152         { NULL, 0 }
 153 };
 154
 155 static struct userdiff_driver driver_false = {
 156         "!diff",
 157         NULL,
 158         1,
 159         { NULL, 0 }
 160 };
 161
 162 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 163 {
 164         int i;
 165         for (i = 0; i < ndrivers; i++) {
 166                 struct userdiff_driver *drv = drivers + i;
 167                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 168                         return drv;
 169         }
 170         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 171                 struct userdiff_driver *drv = builtin_drivers + i;
 172                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 173                         return drv;
 174         }
 175         return NULL;
 176 }
 177
 178 static struct userdiff_driver *parse_driver(const char *var,
 179                 const char *value, const char *type)
 180 {
 181         struct userdiff_driver *drv;
 182         const char *dot;
 183         const char *name;
 184         int namelen;
 185
 186         if (prefixcmp(var, "diff."))
 187                 return NULL;
 188         dot = strrchr(var, '.');
 189         if (dot == var + 4)
 190                 return NULL;
 191         if (strcmp(type, dot+1))
 192                 return NULL;
 193
 194         name = var + 5;
 195         namelen = dot - name;
 196         drv = userdiff_find_by_namelen(name, namelen);
 197         if (!drv) {
 198                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 199                 drv = &drivers[ndrivers++];
 200                 memset(drv, 0, sizeof(*drv));
 201                 drv->name = xmemdupz(name, namelen);
 202                 drv->binary = -1;
 203         }
 204         return drv;
 205 }
 206
 207 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 208                 const char *v, int cflags)
 209 {
 210         if (git_config_string(&f->pattern, k, v) < 0)
 211                 return -1;
 212         f->cflags = cflags;
 213         return 1;
 214 }
 215
 216 static int parse_string(const char **d, const char *k, const char *v)
 217 {
 218         if (git_config_string(d, k, v) < 0)
 219                 return -1;
 220         return 1;
 221 }
 222
 223 static int parse_tristate(int *b, const char *k, const char *v)
 224 {
 225         if (v && !strcasecmp(v, "auto"))
 226                 *b = -1;
 227         else
 228                 *b = git_config_bool(k, v);
 229         return 1;
 230 }
 231
 232 static int parse_bool(int *b, const char *k, const char *v)
 233 {
 234         *b = git_config_bool(k, v);
 235         return 1;
 236 }
 237
 238 int userdiff_config(const char *k, const char *v)
 239 {
 240         struct userdiff_driver *drv;
 241
 242         if ((drv = parse_driver(k, v, "funcname")))
 243                 return parse_funcname(&drv->funcname, k, v, 0);
 244         if ((drv = parse_driver(k, v, "xfuncname")))
 245                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 246         if ((drv = parse_driver(k, v, "binary")))
 247                 return parse_tristate(&drv->binary, k, v);
 248         if ((drv = parse_driver(k, v, "command")))
 249                 return parse_string(&drv->external, k, v);
 250         if ((drv = parse_driver(k, v, "textconv")))
 251                 return parse_string(&drv->textconv, k, v);
 252         if ((drv = parse_driver(k, v, "cachetextconv")))
 253                 return parse_bool(&drv->textconv_want_cache, k, v);
 254         if ((drv = parse_driver(k, v, "wordregex")))
 255                 return parse_string(&drv->word_regex, k, v);
 256
 257         return 0;
 258 }
 259
 260 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 261         int len = strlen(name);
 262         return userdiff_find_by_namelen(name, len);
 263 }
 264
 265 struct userdiff_driver *userdiff_find_by_path(const char *path)
 266 {
 267         static struct git_attr *attr;
 268         struct git_attr_check check;
 269
 270         if (!attr)
 271                 attr = git_attr("diff");
 272         check.attr = attr;
 273
 274         if (!path)
 275                 return NULL;
 276         if (git_check_attr(path, 1, &check))
 277                 return NULL;
 278
 279         if (ATTR_TRUE(check.value))
 280                 return &driver_true;
 281         if (ATTR_FALSE(check.value))
 282                 return &driver_false;
 283         if (ATTR_UNSET(check.value))
 284                 return NULL;
 285         return userdiff_find_by_name(check.value);
 286 }
 287
 288 struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 289 {
 290         if (!driver->textconv)
 291                 return NULL;
 292
 293         if (driver->textconv_want_cache && !driver->textconv_cache) {
 294                 struct notes_cache *c = xmalloc(sizeof(*c));
 295                 struct strbuf name = STRBUF_INIT;
 296
 297                 strbuf_addf(&name, "textconv/%s", driver->name);
 298                 notes_cache_init(c, name.buf, driver->textconv);
 299                 driver->textconv_cache = c;
 300         }
 301
 302         return driver;
 303 }