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 static struct userdiff_driver builtin_drivers[] = {
  13 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  14          "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  15 PATTERNS("java",
  16          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  17          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  18          /* -- */
  19          "[a-zA-Z_][a-zA-Z0-9_]*"
  20          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  21          "|[-+*/<>%&^|=!]="
  22          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
  23          "|[^[:space:]]|[\x80-\xff]+"),
  24 PATTERNS("objc",
  25          /* Negate C statements that can look like functions */
  26          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  27          /* Objective-C methods */
  28          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  29          /* C functions */
  30          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  31          /* Objective-C class/protocol definitions */
  32          "^(@(implementation|interface|protocol)[ \t].*)$",
  33          /* -- */
  34          "[a-zA-Z_][a-zA-Z0-9_]*"
  35          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  36          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  37          "|[^[:space:]]|[\x80-\xff]+"),
  38 PATTERNS("pascal",
  39          "^((procedure|function|constructor|destructor|interface|"
  40                 "implementation|initialization|finalization)[ \t]*.*)$"
  41          "\n"
  42          "^(.*=[ \t]*(class|record).*)$",
  43          /* -- */
  44          "[a-zA-Z_][a-zA-Z0-9_]*"
  45          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  46          "|<>|<=|>=|:=|\\.\\."
  47          "|[^[:space:]]|[\x80-\xff]+"),
  48 PATTERNS("php", "^[\t ]*((function|class).*)",
  49          /* -- */
  50          "[a-zA-Z_][a-zA-Z0-9_]*"
  51          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  52          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  53          "|[^[:space:]]|[\x80-\xff]+"),
  54 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  55          /* -- */
  56          "[a-zA-Z_][a-zA-Z0-9_]*"
  57          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  58          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  59          "|[^[:space:]|[\x80-\xff]+"),
  60          /* -- */
  61 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  62          /* -- */
  63          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
  64          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
  65          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
  66          "|[^[:space:]|[\x80-\xff]+"),
  67 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  68          "[={}\"]|[^={}\" \t]+"),
  69 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  70          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  71 PATTERNS("cpp",
  72          /* Jump targets or access declarations */
  73          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
  74          /* C/++ functions/methods at top level */
  75          "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
  76          /* compound type at top level */
  77          "^((struct|class|enum)[^;]*)$",
  78          /* -- */
  79          "[a-zA-Z_][a-zA-Z0-9_]*"
  80          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  81          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  82          "|[^[:space:]]|[\x80-\xff]+"),
  83 { "default", NULL, -1, { NULL, 0 } },
  84 };
  85 #undef PATTERNS
  86
  87 static struct userdiff_driver driver_true = {
  88         "diff=true",
  89         NULL,
  90         0,
  91         { NULL, 0 }
  92 };
  93
  94 static struct userdiff_driver driver_false = {
  95         "!diff",
  96         NULL,
  97         1,
  98         { NULL, 0 }
  99 };
 100
 101 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 102 {
 103         int i;
 104         for (i = 0; i < ndrivers; i++) {
 105                 struct userdiff_driver *drv = drivers + i;
 106                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 107                         return drv;
 108         }
 109         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 110                 struct userdiff_driver *drv = builtin_drivers + i;
 111                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 112                         return drv;
 113         }
 114         return NULL;
 115 }
 116
 117 static struct userdiff_driver *parse_driver(const char *var,
 118                 const char *value, const char *type)
 119 {
 120         struct userdiff_driver *drv;
 121         const char *dot;
 122         const char *name;
 123         int namelen;
 124
 125         if (prefixcmp(var, "diff."))
 126                 return NULL;
 127         dot = strrchr(var, '.');
 128         if (dot == var + 4)
 129                 return NULL;
 130         if (strcmp(type, dot+1))
 131                 return NULL;
 132
 133         name = var + 5;
 134         namelen = dot - name;
 135         drv = userdiff_find_by_namelen(name, namelen);
 136         if (!drv) {
 137                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 138                 drv = &drivers[ndrivers++];
 139                 memset(drv, 0, sizeof(*drv));
 140                 drv->name = xmemdupz(name, namelen);
 141                 drv->binary = -1;
 142         }
 143         return drv;
 144 }
 145
 146 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 147                 const char *v, int cflags)
 148 {
 149         if (git_config_string(&f->pattern, k, v) < 0)
 150                 return -1;
 151         f->cflags = cflags;
 152         return 1;
 153 }
 154
 155 static int parse_string(const char **d, const char *k, const char *v)
 156 {
 157         if (git_config_string(d, k, v) < 0)
 158                 return -1;
 159         return 1;
 160 }
 161
 162 static int parse_tristate(int *b, const char *k, const char *v)
 163 {
 164         if (v && !strcasecmp(v, "auto"))
 165                 *b = -1;
 166         else
 167                 *b = git_config_bool(k, v);
 168         return 1;
 169 }
 170
 171 static int parse_bool(int *b, const char *k, const char *v)
 172 {
 173         *b = git_config_bool(k, v);
 174         return 1;
 175 }
 176
 177 int userdiff_config(const char *k, const char *v)
 178 {
 179         struct userdiff_driver *drv;
 180
 181         if ((drv = parse_driver(k, v, "funcname")))
 182                 return parse_funcname(&drv->funcname, k, v, 0);
 183         if ((drv = parse_driver(k, v, "xfuncname")))
 184                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 185         if ((drv = parse_driver(k, v, "binary")))
 186                 return parse_tristate(&drv->binary, k, v);
 187         if ((drv = parse_driver(k, v, "command")))
 188                 return parse_string(&drv->external, k, v);
 189         if ((drv = parse_driver(k, v, "textconv")))
 190                 return parse_string(&drv->textconv, k, v);
 191         if ((drv = parse_driver(k, v, "cachetextconv")))
 192                 return parse_bool(&drv->textconv_want_cache, k, v);
 193         if ((drv = parse_driver(k, v, "wordregex")))
 194                 return parse_string(&drv->word_regex, k, v);
 195
 196         return 0;
 197 }
 198
 199 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 200         int len = strlen(name);
 201         return userdiff_find_by_namelen(name, len);
 202 }
 203
 204 struct userdiff_driver *userdiff_find_by_path(const char *path)
 205 {
 206         static struct git_attr *attr;
 207         struct git_attr_check check;
 208
 209         if (!attr)
 210                 attr = git_attr("diff");
 211         check.attr = attr;
 212
 213         if (!path)
 214                 return NULL;
 215         if (git_checkattr(path, 1, &check))
 216                 return NULL;
 217
 218         if (ATTR_TRUE(check.value))
 219                 return &driver_true;
 220         if (ATTR_FALSE(check.value))
 221                 return &driver_false;
 222         if (ATTR_UNSET(check.value))
 223                 return NULL;
 224         return userdiff_find_by_name(check.value);
 225 }