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