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