userdiff.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "userdiff.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("ada",
  18          "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
  19          "!^[ \t]*with[ \t].*$\n"
  20          "^[ \t]*((procedure|function)[ \t]+.*)$\n"
  21          "^[ \t]*((package|protected|task)[ \t]+.*)$",
  22          /* -- */
  23          "[a-zA-Z][a-zA-Z0-9_]*"
  24          "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
  25          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
  26 IPATTERN("fortran",
  27          "!^([C*]|[ \t]*!)\n"
  28          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  29          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  30                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  31          /* -- */
  32          "[a-zA-Z][a-zA-Z0-9_]*"
  33          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  34          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  35           * Don't worry about format statements without leading digits since
  36           * they would have been matched above as a variable anyway. */
  37          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  38          "|//|\\*\\*|::|[/<>=]="),
  39 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
  40          "[^ \t-]+"),
  41 PATTERNS("golang",
  42          /* Functions */
  43          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
  44          /* Structs and interfaces */
  45          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
  46          /* -- */
  47          "[a-zA-Z_][a-zA-Z0-9_]*"
  48          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
  49          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
  50 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
  51          "[^<>= \t]+"),
  52 PATTERNS("java",
  53          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  54          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  55          /* -- */
  56          "[a-zA-Z_][a-zA-Z0-9_]*"
  57          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  58          "|[-+*/<>%&^|=!]="
  59          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  60 PATTERNS("matlab",
  61          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  62          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  63 PATTERNS("objc",
  64          /* Negate C statements that can look like functions */
  65          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  66          /* Objective-C methods */
  67          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  68          /* C functions */
  69          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  70          /* Objective-C class/protocol definitions */
  71          "^(@(implementation|interface|protocol)[ \t].*)$",
  72          /* -- */
  73          "[a-zA-Z_][a-zA-Z0-9_]*"
  74          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  75          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  76 PATTERNS("pascal",
  77          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  78                 "implementation|initialization|finalization)[ \t]*.*)$"
  79          "\n"
  80          "^(.*=[ \t]*(class|record).*)$",
  81          /* -- */
  82          "[a-zA-Z_][a-zA-Z0-9_]*"
  83          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  84          "|<>|<=|>=|:=|\\.\\."),
  85 PATTERNS("perl",
  86          "^package .*\n"
  87          "^sub [[:alnum:]_':]+[ \t]*"
  88                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
  89                 /*
  90                  * Attributes.  A regex can't count nested parentheses,
  91                  * so just slurp up whatever we see, taking care not
  92                  * to accept lines like "sub foo; # defined elsewhere".
  93                  *
  94                  * An attribute could contain a semicolon, but at that
  95                  * point it seems reasonable enough to give up.
  96                  */
  97                 "(:[^;#]*)?"
  98                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
  99                 "(#.*)?$\n" /* comment */
 100          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
 101                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 102                 "(#.*)?$\n"
 103          "^=head[0-9] .*",      /* POD */
 104          /* -- */
 105          "[[:alpha:]_'][[:alnum:]_']*"
 106          "|0[xb]?[0-9a-fA-F_]*"
 107          /* taking care not to interpret 3..5 as (3.)(.5) */
 108          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 109          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 110          "|&&=|\\|\\|=|//=|\\*\\*="
 111          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 112          "|[-+*/%.^&<>=!|]="
 113          "|=~|!~"
 114          "|<<|<>|<=>|>>"),
 115 PATTERNS("php",
 116          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 117          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
 118          /* -- */
 119          "[a-zA-Z_][a-zA-Z0-9_]*"
 120          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 121          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 122 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 123          /* -- */
 124          "[a-zA-Z_][a-zA-Z0-9_]*"
 125          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 126          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 127          /* -- */
 128 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 129          /* -- */
 130          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 131          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 132          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 133 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 134          "[={}\"]|[^={}\" \t]+"),
 135 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 136          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 137 PATTERNS("cpp",
 138          /* Jump targets or access declarations */
 139          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 140          /* functions/methods, variables, and compounds at top level */
 141          "^((::[[:space:]]*)?[A-Za-z_].*)$",
 142          /* -- */
 143          "[a-zA-Z_][a-zA-Z0-9_]*"
 144          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 145          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 146 PATTERNS("csharp",
 147          /* Keywords */
 148          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 149          /* Methods and constructors */
 150          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 151          /* Properties */
 152          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 153          /* Type definitions */
 154          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 155          /* Namespace */
 156          "^[ \t]*(namespace[ \t]+.*)$",
 157          /* -- */
 158          "[a-zA-Z_][a-zA-Z0-9_]*"
 159          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 160          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 161 IPATTERN("css",
 162          "![:;][[:space:]]*$\n"
 163          "^[_a-z0-9].*$",
 164          /* -- */
 165          /*
 166           * This regex comes from W3C CSS specs. Should theoretically also
 167           * allow ISO 10646 characters U+00A0 and higher,
 168           * but they are not handled in this regex.
 169           */
 170          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 171          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 172 ),
 173 { "default", NULL, -1, { NULL, 0 } },
 174 };
 175 #undef PATTERNS
 176 #undef IPATTERN
 177
 178 static struct userdiff_driver driver_true = {
 179         "diff=true",
 180         NULL,
 181         0,
 182         { NULL, 0 }
 183 };
 184
 185 static struct userdiff_driver driver_false = {
 186         "!diff",
 187         NULL,
 188         1,
 189         { NULL, 0 }
 190 };
 191
 192 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 193 {
 194         int i;
 195         for (i = 0; i < ndrivers; i++) {
 196                 struct userdiff_driver *drv = drivers + i;
 197                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 198                         return drv;
 199         }
 200         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 201                 struct userdiff_driver *drv = builtin_drivers + i;
 202                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 203                         return drv;
 204         }
 205         return NULL;
 206 }
 207
 208 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 209                 const char *v, int cflags)
 210 {
 211         if (git_config_string(&f->pattern, k, v) < 0)
 212                 return -1;
 213         f->cflags = cflags;
 214         return 0;
 215 }
 216
 217 static int parse_tristate(int *b, const char *k, const char *v)
 218 {
 219         if (v && !strcasecmp(v, "auto"))
 220                 *b = -1;
 221         else
 222                 *b = git_config_bool(k, v);
 223         return 0;
 224 }
 225
 226 static int parse_bool(int *b, const char *k, const char *v)
 227 {
 228         *b = git_config_bool(k, v);
 229         return 0;
 230 }
 231
 232 int userdiff_config(const char *k, const char *v)
 233 {
 234         struct userdiff_driver *drv;
 235         const char *name, *type;
 236         int namelen;
 237
 238         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 239                 return 0;
 240
 241         drv = userdiff_find_by_namelen(name, namelen);
 242         if (!drv) {
 243                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 244                 drv = &drivers[ndrivers++];
 245                 memset(drv, 0, sizeof(*drv));
 246                 drv->name = xmemdupz(name, namelen);
 247                 drv->binary = -1;
 248         }
 249
 250         if (!strcmp(type, "funcname"))
 251                 return parse_funcname(&drv->funcname, k, v, 0);
 252         if (!strcmp(type, "xfuncname"))
 253                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 254         if (!strcmp(type, "binary"))
 255                 return parse_tristate(&drv->binary, k, v);
 256         if (!strcmp(type, "command"))
 257                 return git_config_string(&drv->external, k, v);
 258         if (!strcmp(type, "textconv"))
 259                 return git_config_string(&drv->textconv, k, v);
 260         if (!strcmp(type, "cachetextconv"))
 261                 return parse_bool(&drv->textconv_want_cache, k, v);
 262         if (!strcmp(type, "wordregex"))
 263                 return git_config_string(&drv->word_regex, k, v);
 264
 265         return 0;
 266 }
 267
 268 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 269         int len = strlen(name);
 270         return userdiff_find_by_namelen(name, len);
 271 }
 272
 273 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
 274                                               const char *path)
 275 {
 276         static struct attr_check *check;
 277
 278         if (!check)
 279                 check = attr_check_initl("diff", NULL);
 280         if (!path)
 281                 return NULL;
 282         git_check_attr(istate, path, check);
 283
 284         if (ATTR_TRUE(check->items[0].value))
 285                 return &driver_true;
 286         if (ATTR_FALSE(check->items[0].value))
 287                 return &driver_false;
 288         if (ATTR_UNSET(check->items[0].value))
 289                 return NULL;
 290         return userdiff_find_by_name(check->items[0].value);
 291 }
 292
 293 struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 294 {
 295         if (!driver->textconv)
 296                 return NULL;
 297
 298         if (driver->textconv_want_cache && !driver->textconv_cache) {
 299                 struct notes_cache *c = xmalloc(sizeof(*c));
 300                 struct strbuf name = STRBUF_INIT;
 301
 302                 strbuf_addf(&name, "textconv/%s", driver->name);
 303                 notes_cache_init(c, name.buf, driver->textconv);
 304                 driver->textconv_cache = c;
 305                 strbuf_release(&name);
 306         }
 307
 308         return driver;
 309 }