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          "!=\n"
  29          /* lines beginning with a word optionally preceded by '&' or the root */
  30          "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)",
  31          /* -- */
  32          /* Property names and math operators */
  33          "[a-zA-Z0-9,._+?#-]+"
  34          "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"),
  35 PATTERNS("elixir",
  36          "^[ \t]*((def(macro|module|impl|protocol|p)?|test)[ \t].*)$",
  37          /* -- */
  38          /* Atoms, names, and module attributes */
  39          "[@:]?[a-zA-Z0-9@_?!]+"
  40          /* Numbers with specific base */
  41          "|[-+]?0[xob][0-9a-fA-F]+"
  42          /* Numbers */
  43          "|[-+]?[0-9][0-9_.]*([eE][-+]?[0-9_]+)?"
  44          /* Operators and atoms that represent them */
  45          "|:?(\\+\\+|--|\\.\\.|~~~|<>|\\^\\^\\^|<?\\|>|<<<?|>?>>|<<?~|~>?>|<~>|<=|>=|===?|!==?|=~|&&&?|\\|\\|\\|?|=>|<-|\\\\\\\\|->)"
  46          /* Not real operators, but should be grouped */
  47          "|:?%[A-Za-z0-9_.]\\{\\}?"),
  48 IPATTERN("fortran",
  49          "!^([C*]|[ \t]*!)\n"
  50          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  51          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  52                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  53          /* -- */
  54          "[a-zA-Z][a-zA-Z0-9_]*"
  55          "|\\.([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])\\."
  56          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  57           * Don't worry about format statements without leading digits since
  58           * they would have been matched above as a variable anyway. */
  59          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  60          "|//|\\*\\*|::|[/<>=]="),
  61 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
  62          "[^ \t-]+"),
  63 PATTERNS("golang",
  64          /* Functions */
  65          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
  66          /* Structs and interfaces */
  67          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
  68          /* -- */
  69          "[a-zA-Z_][a-zA-Z0-9_]*"
  70          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
  71          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
  72 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
  73          "[^<>= \t]+"),
  74 PATTERNS("java",
  75          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  76          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  77          /* -- */
  78          "[a-zA-Z_][a-zA-Z0-9_]*"
  79          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  80          "|[-+*/<>%&^|=!]="
  81          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  82 PATTERNS("matlab",
  83          /*
  84           * Octave pattern is mostly the same as matlab, except that '%%%' and
  85           * '##' can also be used to begin code sections, in addition to '%%'
  86           * that is understood by both.
  87           */
  88          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
  89          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  90 PATTERNS("objc",
  91          /* Negate C statements that can look like functions */
  92          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  93          /* Objective-C methods */
  94          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  95          /* C functions */
  96          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  97          /* Objective-C class/protocol definitions */
  98          "^(@(implementation|interface|protocol)[ \t].*)$",
  99          /* -- */
 100          "[a-zA-Z_][a-zA-Z0-9_]*"
 101          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 102          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 103 PATTERNS("pascal",
 104          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
 105                 "implementation|initialization|finalization)[ \t]*.*)$"
 106          "\n"
 107          "^(.*=[ \t]*(class|record).*)$",
 108          /* -- */
 109          "[a-zA-Z_][a-zA-Z0-9_]*"
 110          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 111          "|<>|<=|>=|:=|\\.\\."),
 112 PATTERNS("perl",
 113          "^package .*\n"
 114          "^sub [[:alnum:]_':]+[ \t]*"
 115                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
 116                 /*
 117                  * Attributes.  A regex can't count nested parentheses,
 118                  * so just slurp up whatever we see, taking care not
 119                  * to accept lines like "sub foo; # defined elsewhere".
 120                  *
 121                  * An attribute could contain a semicolon, but at that
 122                  * point it seems reasonable enough to give up.
 123                  */
 124                 "(:[^;#]*)?"
 125                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 126                 "(#.*)?$\n" /* comment */
 127          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
 128                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 129                 "(#.*)?$\n"
 130          "^=head[0-9] .*",      /* POD */
 131          /* -- */
 132          "[[:alpha:]_'][[:alnum:]_']*"
 133          "|0[xb]?[0-9a-fA-F_]*"
 134          /* taking care not to interpret 3..5 as (3.)(.5) */
 135          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 136          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 137          "|&&=|\\|\\|=|//=|\\*\\*="
 138          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 139          "|[-+*/%.^&<>=!|]="
 140          "|=~|!~"
 141          "|<<|<>|<=>|>>"),
 142 PATTERNS("php",
 143          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 144          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
 145          /* -- */
 146          "[a-zA-Z_][a-zA-Z0-9_]*"
 147          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 148          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 149 PATTERNS("python", "^[ \t]*((class|(async[ \t]+)?def)[ \t].*)$",
 150          /* -- */
 151          "[a-zA-Z_][a-zA-Z0-9_]*"
 152          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 153          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 154          /* -- */
 155 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 156          /* -- */
 157          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 158          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 159          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 160 PATTERNS("rust",
 161          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl)[< \t]+[^;]*)$",
 162          /* -- */
 163          "[a-zA-Z_][a-zA-Z0-9_]*"
 164          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
 165          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
 166 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 167          "[={}\"]|[^={}\" \t]+"),
 168 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 169          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 170 PATTERNS("cpp",
 171          /* Jump targets or access declarations */
 172          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 173          /* functions/methods, variables, and compounds at top level */
 174          "^((::[[:space:]]*)?[A-Za-z_].*)$",
 175          /* -- */
 176          "[a-zA-Z_][a-zA-Z0-9_]*"
 177          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 178          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 179 PATTERNS("csharp",
 180          /* Keywords */
 181          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 182          /* Methods and constructors */
 183          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 184          /* Properties */
 185          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 186          /* Type definitions */
 187          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 188          /* Namespace */
 189          "^[ \t]*(namespace[ \t]+.*)$",
 190          /* -- */
 191          "[a-zA-Z_][a-zA-Z0-9_]*"
 192          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 193          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 194 IPATTERN("css",
 195          "![:;][[:space:]]*$\n"
 196          "^[_a-z0-9].*$",
 197          /* -- */
 198          /*
 199           * This regex comes from W3C CSS specs. Should theoretically also
 200           * allow ISO 10646 characters U+00A0 and higher,
 201           * but they are not handled in this regex.
 202           */
 203          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 204          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 205 ),
 206 { "default", NULL, -1, { NULL, 0 } },
 207 };
 208 #undef PATTERNS
 209 #undef IPATTERN
 210
 211 static struct userdiff_driver driver_true = {
 212         "diff=true",
 213         NULL,
 214         0,
 215         { NULL, 0 }
 216 };
 217
 218 static struct userdiff_driver driver_false = {
 219         "!diff",
 220         NULL,
 221         1,
 222         { NULL, 0 }
 223 };
 224
 225 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 226 {
 227         int i;
 228         for (i = 0; i < ndrivers; i++) {
 229                 struct userdiff_driver *drv = drivers + i;
 230                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 231                         return drv;
 232         }
 233         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 234                 struct userdiff_driver *drv = builtin_drivers + i;
 235                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 236                         return drv;
 237         }
 238         return NULL;
 239 }
 240
 241 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 242                 const char *v, int cflags)
 243 {
 244         if (git_config_string(&f->pattern, k, v) < 0)
 245                 return -1;
 246         f->cflags = cflags;
 247         return 0;
 248 }
 249
 250 static int parse_tristate(int *b, const char *k, const char *v)
 251 {
 252         if (v && !strcasecmp(v, "auto"))
 253                 *b = -1;
 254         else
 255                 *b = git_config_bool(k, v);
 256         return 0;
 257 }
 258
 259 static int parse_bool(int *b, const char *k, const char *v)
 260 {
 261         *b = git_config_bool(k, v);
 262         return 0;
 263 }
 264
 265 int userdiff_config(const char *k, const char *v)
 266 {
 267         struct userdiff_driver *drv;
 268         const char *name, *type;
 269         int namelen;
 270
 271         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 272                 return 0;
 273
 274         drv = userdiff_find_by_namelen(name, namelen);
 275         if (!drv) {
 276                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 277                 drv = &drivers[ndrivers++];
 278                 memset(drv, 0, sizeof(*drv));
 279                 drv->name = xmemdupz(name, namelen);
 280                 drv->binary = -1;
 281         }
 282
 283         if (!strcmp(type, "funcname"))
 284                 return parse_funcname(&drv->funcname, k, v, 0);
 285         if (!strcmp(type, "xfuncname"))
 286                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 287         if (!strcmp(type, "binary"))
 288                 return parse_tristate(&drv->binary, k, v);
 289         if (!strcmp(type, "command"))
 290                 return git_config_string(&drv->external, k, v);
 291         if (!strcmp(type, "textconv"))
 292                 return git_config_string(&drv->textconv, k, v);
 293         if (!strcmp(type, "cachetextconv"))
 294                 return parse_bool(&drv->textconv_want_cache, k, v);
 295         if (!strcmp(type, "wordregex"))
 296                 return git_config_string(&drv->word_regex, k, v);
 297
 298         return 0;
 299 }
 300
 301 struct userdiff_driver *userdiff_find_by_name(const char *name)
 302 {
 303         int len = strlen(name);
 304         return userdiff_find_by_namelen(name, len);
 305 }
 306
 307 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
 308                                               const char *path)
 309 {
 310         static struct attr_check *check;
 311
 312         if (!check)
 313                 check = attr_check_initl("diff", NULL);
 314         if (!path)
 315                 return NULL;
 316         git_check_attr(istate, path, check);
 317
 318         if (ATTR_TRUE(check->items[0].value))
 319                 return &driver_true;
 320         if (ATTR_FALSE(check->items[0].value))
 321                 return &driver_false;
 322         if (ATTR_UNSET(check->items[0].value))
 323                 return NULL;
 324         return userdiff_find_by_name(check->items[0].value);
 325 }
 326
 327 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
 328                                               struct userdiff_driver *driver)
 329 {
 330         if (!driver->textconv)
 331                 return NULL;
 332
 333         if (driver->textconv_want_cache && !driver->textconv_cache) {
 334                 struct notes_cache *c = xmalloc(sizeof(*c));
 335                 struct strbuf name = STRBUF_INIT;
 336
 337                 strbuf_addf(&name, "textconv/%s", driver->name);
 338                 notes_cache_init(r, c, name.buf, driver->textconv);
 339                 driver->textconv_cache = c;
 340                 strbuf_release(&name);
 341         }
 342
 343         return driver;
 344 }