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