userdiff.c

   1 #include "userdiff.h"
   2 #include "cache.h"
   3 #include "attr.h"
   4
   5 static struct userdiff_driver *drivers;
   6 static int ndrivers;
   7 static int drivers_alloc;
   8
   9 #define PATTERNS(name, pattern, word_regex)                     \
  10         { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
  11 static struct userdiff_driver builtin_drivers[] = {
  12 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  13          "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  14 PATTERNS("java",
  15          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  16          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  17          /* -- */
  18          "[a-zA-Z_][a-zA-Z0-9_]*"
  19          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  20          "|[-+*/<>%&^|=!]="
  21          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
  22          "|[^[:space:]]|[\x80-\xff]+"),
  23 PATTERNS("objc",
  24          /* Negate C statements that can look like functions */
  25          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  26          /* Objective-C methods */
  27          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  28          /* C functions */
  29          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  30          /* Objective-C class/protocol definitions */
  31          "^(@(implementation|interface|protocol)[ \t].*)$",
  32          /* -- */
  33          "[a-zA-Z_][a-zA-Z0-9_]*"
  34          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  35          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  36          "|[^[:space:]]|[\x80-\xff]+"),
  37 PATTERNS("pascal",
  38          "^((procedure|function|constructor|destructor|interface|"
  39                 "implementation|initialization|finalization)[ \t]*.*)$"
  40          "\n"
  41          "^(.*=[ \t]*(class|record).*)$",
  42          /* -- */
  43          "[a-zA-Z_][a-zA-Z0-9_]*"
  44          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  45          "|<>|<=|>=|:=|\\.\\."
  46          "|[^[:space:]]|[\x80-\xff]+"),
  47 PATTERNS("php", "^[\t ]*((function|class).*)",
  48          /* -- */
  49          "[a-zA-Z_][a-zA-Z0-9_]*"
  50          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  51          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  52          "|[^[:space:]]|[\x80-\xff]+"),
  53 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  54          /* -- */
  55          "[a-zA-Z_][a-zA-Z0-9_]*"
  56          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  57          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  58          "|[^[:space:]|[\x80-\xff]+"),
  59          /* -- */
  60 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  61          /* -- */
  62          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
  63          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
  64          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
  65          "|[^[:space:]|[\x80-\xff]+"),
  66 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  67          "[={}\"]|[^={}\" \t]+"),
  68 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  69          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  70 PATTERNS("cpp",
  71          /* Jump targets or access declarations */
  72          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
  73          /* C/++ functions/methods at top level */
  74          "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
  75          /* compound type at top level */
  76          "^((struct|class|enum)[^;]*)$",
  77          /* -- */
  78          "[a-zA-Z_][a-zA-Z0-9_]*"
  79          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  80          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  81          "|[^[:space:]]|[\x80-\xff]+"),
  82 { "default", NULL, -1, { NULL, 0 } },
  83 };
  84 #undef PATTERNS
  85
  86 static struct userdiff_driver driver_true = {
  87         "diff=true",
  88         NULL,
  89         0,
  90         { NULL, 0 }
  91 };
  92
  93 static struct userdiff_driver driver_false = {
  94         "!diff",
  95         NULL,
  96         1,
  97         { NULL, 0 }
  98 };
  99
 100 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 101 {
 102         int i;
 103         for (i = 0; i < ndrivers; i++) {
 104                 struct userdiff_driver *drv = drivers + i;
 105                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 106                         return drv;
 107         }
 108         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 109                 struct userdiff_driver *drv = builtin_drivers + i;
 110                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 111                         return drv;
 112         }
 113         return NULL;
 114 }
 115
 116 static struct userdiff_driver *parse_driver(const char *var,
 117                 const char *value, const char *type)
 118 {
 119         struct userdiff_driver *drv;
 120         const char *dot;
 121         const char *name;
 122         int namelen;
 123
 124         if (prefixcmp(var, "diff."))
 125                 return NULL;
 126         dot = strrchr(var, '.');
 127         if (dot == var + 4)
 128                 return NULL;
 129         if (strcmp(type, dot+1))
 130                 return NULL;
 131
 132         name = var + 5;
 133         namelen = dot - name;
 134         drv = userdiff_find_by_namelen(name, namelen);
 135         if (!drv) {
 136                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 137                 drv = &drivers[ndrivers++];
 138                 memset(drv, 0, sizeof(*drv));
 139                 drv->name = xmemdupz(name, namelen);
 140                 drv->binary = -1;
 141         }
 142         return drv;
 143 }
 144
 145 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 146                 const char *v, int cflags)
 147 {
 148         if (git_config_string(&f->pattern, k, v) < 0)
 149                 return -1;
 150         f->cflags = cflags;
 151         return 1;
 152 }
 153
 154 static int parse_string(const char **d, const char *k, const char *v)
 155 {
 156         if (git_config_string(d, k, v) < 0)
 157                 return -1;
 158         return 1;
 159 }
 160
 161 static int parse_tristate(int *b, const char *k, const char *v)
 162 {
 163         if (v && !strcasecmp(v, "auto"))
 164                 *b = -1;
 165         else
 166                 *b = git_config_bool(k, v);
 167         return 1;
 168 }
 169
 170 int userdiff_config(const char *k, const char *v)
 171 {
 172         struct userdiff_driver *drv;
 173
 174         if ((drv = parse_driver(k, v, "funcname")))
 175                 return parse_funcname(&drv->funcname, k, v, 0);
 176         if ((drv = parse_driver(k, v, "xfuncname")))
 177                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 178         if ((drv = parse_driver(k, v, "binary")))
 179                 return parse_tristate(&drv->binary, k, v);
 180         if ((drv = parse_driver(k, v, "command")))
 181                 return parse_string(&drv->external, k, v);
 182         if ((drv = parse_driver(k, v, "textconv")))
 183                 return parse_string(&drv->textconv, k, v);
 184         if ((drv = parse_driver(k, v, "wordregex")))
 185                 return parse_string(&drv->word_regex, k, v);
 186
 187         return 0;
 188 }
 189
 190 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 191         int len = strlen(name);
 192         return userdiff_find_by_namelen(name, len);
 193 }
 194
 195 struct userdiff_driver *userdiff_find_by_path(const char *path)
 196 {
 197         static struct git_attr *attr;
 198         struct git_attr_check check;
 199
 200         if (!attr)
 201                 attr = git_attr("diff");
 202         check.attr = attr;
 203
 204         if (!path)
 205                 return NULL;
 206         if (git_checkattr(path, 1, &check))
 207                 return NULL;
 208
 209         if (ATTR_TRUE(check.value))
 210                 return &driver_true;
 211         if (ATTR_FALSE(check.value))
 212                 return &driver_false;
 213         if (ATTR_UNSET(check.value))
 214                 return NULL;
 215         return userdiff_find_by_name(check.value);
 216 }