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