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 PATTERNS("dts",
  27          "!;\n"
  28          /* lines beginning with a word optionally preceded by '&' or the root */
  29          "^[ \t]*((/|&?[a-zA-Z_]).*)",
  30          /* -- */
  31          /* Property names and math operators */
  32          "[a-zA-Z0-9,._+?#-]+"
  33          "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"),
  34 IPATTERN("fortran",
  35          "!^([C*]|[ \t]*!)\n"
  36          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  37          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  38                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  39          /* -- */
  40          "[a-zA-Z][a-zA-Z0-9_]*"
  41          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  42          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  43           * Don't worry about format statements without leading digits since
  44           * they would have been matched above as a variable anyway. */
  45          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  46          "|//|\\*\\*|::|[/<>=]="),
  47 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
  48          "[^ \t-]+"),
  49 PATTERNS("golang",
  50          /* Functions */
  51          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
  52          /* Structs and interfaces */
  53          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
  54          /* -- */
  55          "[a-zA-Z_][a-zA-Z0-9_]*"
  56          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
  57          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
  58 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
  59          "[^<>= \t]+"),
  60 PATTERNS("java",
  61          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  62          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  63          /* -- */
  64          "[a-zA-Z_][a-zA-Z0-9_]*"
  65          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  66          "|[-+*/<>%&^|=!]="
  67          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  68 PATTERNS("matlab",
  69          /*
  70           * Octave pattern is mostly the same as matlab, except that '%%%' and
  71           * '##' can also be used to begin code sections, in addition to '%%'
  72           * that is understood by both.
  73           */
  74          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
  75          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  76 PATTERNS("objc",
  77          /* Negate C statements that can look like functions */
  78          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  79          /* Objective-C methods */
  80          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  81          /* C functions */
  82          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  83          /* Objective-C class/protocol definitions */
  84          "^(@(implementation|interface|protocol)[ \t].*)$",
  85          /* -- */
  86          "[a-zA-Z_][a-zA-Z0-9_]*"
  87          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  88          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  89 PATTERNS("pascal",
  90          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  91                 "implementation|initialization|finalization)[ \t]*.*)$"
  92          "\n"
  93          "^(.*=[ \t]*(class|record).*)$",
  94          /* -- */
  95          "[a-zA-Z_][a-zA-Z0-9_]*"
  96          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  97          "|<>|<=|>=|:=|\\.\\."),
  98 PATTERNS("perl",
  99          "^package .*\n"
 100          "^sub [[:alnum:]_':]+[ \t]*"
 101                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
 102                 /*
 103                  * Attributes.  A regex can't count nested parentheses,
 104                  * so just slurp up whatever we see, taking care not
 105                  * to accept lines like "sub foo; # defined elsewhere".
 106                  *
 107                  * An attribute could contain a semicolon, but at that
 108                  * point it seems reasonable enough to give up.
 109                  */
 110                 "(:[^;#]*)?"
 111                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 112                 "(#.*)?$\n" /* comment */
 113          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
 114                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 115                 "(#.*)?$\n"
 116          "^=head[0-9] .*",      /* POD */
 117          /* -- */
 118          "[[:alpha:]_'][[:alnum:]_']*"
 119          "|0[xb]?[0-9a-fA-F_]*"
 120          /* taking care not to interpret 3..5 as (3.)(.5) */
 121          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 122          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 123          "|&&=|\\|\\|=|//=|\\*\\*="
 124          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 125          "|[-+*/%.^&<>=!|]="
 126          "|=~|!~"
 127          "|<<|<>|<=>|>>"),
 128 PATTERNS("php",
 129          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 130          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
 131          /* -- */
 132          "[a-zA-Z_][a-zA-Z0-9_]*"
 133          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 134          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 135 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 136          /* -- */
 137          "[a-zA-Z_][a-zA-Z0-9_]*"
 138          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 139          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 140          /* -- */
 141 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 142          /* -- */
 143          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 144          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 145          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 146 PATTERNS("rust",
 147          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl)[< \t]+[^;]*)$",
 148          /* -- */
 149          "[a-zA-Z_][a-zA-Z0-9_]*"
 150          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
 151          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
 152 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 153          "[={}\"]|[^={}\" \t]+"),
 154 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 155          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 156 PATTERNS("cpp",
 157          /* Jump targets or access declarations */
 158          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 159          /* functions/methods, variables, and compounds at top level */
 160          "^((::[[:space:]]*)?[A-Za-z_].*)$",
 161          /* -- */
 162          "[a-zA-Z_][a-zA-Z0-9_]*"
 163          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 164          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 165 PATTERNS("csharp",
 166          /* Keywords */
 167          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 168          /* Methods and constructors */
 169          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 170          /* Properties */
 171          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 172          /* Type definitions */
 173          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 174          /* Namespace */
 175          "^[ \t]*(namespace[ \t]+.*)$",
 176          /* -- */
 177          "[a-zA-Z_][a-zA-Z0-9_]*"
 178          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 179          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 180 IPATTERN("css",
 181          "![:;][[:space:]]*$\n"
 182          "^[_a-z0-9].*$",
 183          /* -- */
 184          /*
 185           * This regex comes from W3C CSS specs. Should theoretically also
 186           * allow ISO 10646 characters U+00A0 and higher,
 187           * but they are not handled in this regex.
 188           */
 189          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 190          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 191 ),
 192 { "default", NULL, -1, { NULL, 0 } },
 193 };
 194 #undef PATTERNS
 195 #undef IPATTERN
 196
 197 static struct userdiff_driver driver_true = {
 198         "diff=true",
 199         NULL,
 200         0,
 201         { NULL, 0 }
 202 };
 203
 204 static struct userdiff_driver driver_false = {
 205         "!diff",
 206         NULL,
 207         1,
 208         { NULL, 0 }
 209 };
 210
 211 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 212 {
 213         int i;
 214         for (i = 0; i < ndrivers; i++) {
 215                 struct userdiff_driver *drv = drivers + i;
 216                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 217                         return drv;
 218         }
 219         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 220                 struct userdiff_driver *drv = builtin_drivers + i;
 221                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 222                         return drv;
 223         }
 224         return NULL;
 225 }
 226
 227 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 228                 const char *v, int cflags)
 229 {
 230         if (git_config_string(&f->pattern, k, v) < 0)
 231                 return -1;
 232         f->cflags = cflags;
 233         return 0;
 234 }
 235
 236 static int parse_tristate(int *b, const char *k, const char *v)
 237 {
 238         if (v && !strcasecmp(v, "auto"))
 239                 *b = -1;
 240         else
 241                 *b = git_config_bool(k, v);
 242         return 0;
 243 }
 244
 245 static int parse_bool(int *b, const char *k, const char *v)
 246 {
 247         *b = git_config_bool(k, v);
 248         return 0;
 249 }
 250
 251 int userdiff_config(const char *k, const char *v)
 252 {
 253         struct userdiff_driver *drv;
 254         const char *name, *type;
 255         int namelen;
 256
 257         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 258                 return 0;
 259
 260         drv = userdiff_find_by_namelen(name, namelen);
 261         if (!drv) {
 262                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 263                 drv = &drivers[ndrivers++];
 264                 memset(drv, 0, sizeof(*drv));
 265                 drv->name = xmemdupz(name, namelen);
 266                 drv->binary = -1;
 267         }
 268
 269         if (!strcmp(type, "funcname"))
 270                 return parse_funcname(&drv->funcname, k, v, 0);
 271         if (!strcmp(type, "xfuncname"))
 272                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 273         if (!strcmp(type, "binary"))
 274                 return parse_tristate(&drv->binary, k, v);
 275         if (!strcmp(type, "command"))
 276                 return git_config_string(&drv->external, k, v);
 277         if (!strcmp(type, "textconv"))
 278                 return git_config_string(&drv->textconv, k, v);
 279         if (!strcmp(type, "cachetextconv"))
 280                 return parse_bool(&drv->textconv_want_cache, k, v);
 281         if (!strcmp(type, "wordregex"))
 282                 return git_config_string(&drv->word_regex, k, v);
 283
 284         return 0;
 285 }
 286
 287 struct userdiff_driver *userdiff_find_by_name(const char *name)
 288 {
 289         int len = strlen(name);
 290         return userdiff_find_by_namelen(name, len);
 291 }
 292
 293 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
 294                                               const char *path)
 295 {
 296         static struct attr_check *check;
 297
 298         if (!check)
 299                 check = attr_check_initl("diff", NULL);
 300         if (!path)
 301                 return NULL;
 302         git_check_attr(istate, path, check);
 303
 304         if (ATTR_TRUE(check->items[0].value))
 305                 return &driver_true;
 306         if (ATTR_FALSE(check->items[0].value))
 307                 return &driver_false;
 308         if (ATTR_UNSET(check->items[0].value))
 309                 return NULL;
 310         return userdiff_find_by_name(check->items[0].value);
 311 }
 312
 313 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
 314                                               struct userdiff_driver *driver)
 315 {
 316         if (!driver->textconv)
 317                 return NULL;
 318
 319         if (driver->textconv_want_cache && !driver->textconv_cache) {
 320                 struct notes_cache *c = xmalloc(sizeof(*c));
 321                 struct strbuf name = STRBUF_INIT;
 322
 323                 strbuf_addf(&name, "textconv/%s", driver->name);
 324                 notes_cache_init(r, c, name.buf, driver->textconv);
 325                 driver->textconv_cache = c;
 326                 strbuf_release(&name);
 327         }
 328
 329         return driver;
 330 }