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).*)$",
  43          /* -- */
  44          "[a-zA-Z_][a-zA-Z0-9_]*"
  45          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  46          "|<>|<=|>=|:=|\\.\\."
  47          "|[^[:space:]]|[\x80-\xff]+"),
  48 PATTERNS("php",
  49          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
  50          "^[\t ]*(class.*)$",
  51          /* -- */
  52          "[a-zA-Z_][a-zA-Z0-9_]*"
  53          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  54          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  55          "|[^[:space:]]|[\x80-\xff]+"),
  56 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  57          /* -- */
  58          "[a-zA-Z_][a-zA-Z0-9_]*"
  59          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  60          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  61          "|[^[:space:]|[\x80-\xff]+"),
  62          /* -- */
  63 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  64          /* -- */
  65          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
  66          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
  67          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
  68          "|[^[:space:]|[\x80-\xff]+"),
  69 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  70          "[={}\"]|[^={}\" \t]+"),
  71 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  72          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  73 PATTERNS("cpp",
  74          /* Jump targets or access declarations */
  75          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
  76          /* C/++ functions/methods at top level */
  77          "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
  78          /* compound type at top level */
  79          "^((struct|class|enum)[^;]*)$",
  80          /* -- */
  81          "[a-zA-Z_][a-zA-Z0-9_]*"
  82          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  83          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  84          "|[^[:space:]]|[\x80-\xff]+"),
  85 { "default", NULL, -1, { NULL, 0 } },
  86 };
  87 #undef PATTERNS
  88
  89 static struct userdiff_driver driver_true = {
  90         "diff=true",
  91         NULL,
  92         0,
  93         { NULL, 0 }
  94 };
  95
  96 static struct userdiff_driver driver_false = {
  97         "!diff",
  98         NULL,
  99         1,
 100         { NULL, 0 }
 101 };
 102
 103 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 104 {
 105         int i;
 106         for (i = 0; i < ndrivers; i++) {
 107                 struct userdiff_driver *drv = drivers + i;
 108                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 109                         return drv;
 110         }
 111         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 112                 struct userdiff_driver *drv = builtin_drivers + i;
 113                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 114                         return drv;
 115         }
 116         return NULL;
 117 }
 118
 119 static struct userdiff_driver *parse_driver(const char *var,
 120                 const char *value, const char *type)
 121 {
 122         struct userdiff_driver *drv;
 123         const char *dot;
 124         const char *name;
 125         int namelen;
 126
 127         if (prefixcmp(var, "diff."))
 128                 return NULL;
 129         dot = strrchr(var, '.');
 130         if (dot == var + 4)
 131                 return NULL;
 132         if (strcmp(type, dot+1))
 133                 return NULL;
 134
 135         name = var + 5;
 136         namelen = dot - name;
 137         drv = userdiff_find_by_namelen(name, namelen);
 138         if (!drv) {
 139                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 140                 drv = &drivers[ndrivers++];
 141                 memset(drv, 0, sizeof(*drv));
 142                 drv->name = xmemdupz(name, namelen);
 143                 drv->binary = -1;
 144         }
 145         return drv;
 146 }
 147
 148 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 149                 const char *v, int cflags)
 150 {
 151         if (git_config_string(&f->pattern, k, v) < 0)
 152                 return -1;
 153         f->cflags = cflags;
 154         return 1;
 155 }
 156
 157 static int parse_string(const char **d, const char *k, const char *v)
 158 {
 159         if (git_config_string(d, k, v) < 0)
 160                 return -1;
 161         return 1;
 162 }
 163
 164 static int parse_tristate(int *b, const char *k, const char *v)
 165 {
 166         if (v && !strcasecmp(v, "auto"))
 167                 *b = -1;
 168         else
 169                 *b = git_config_bool(k, v);
 170         return 1;
 171 }
 172
 173 static int parse_bool(int *b, const char *k, const char *v)
 174 {
 175         *b = git_config_bool(k, v);
 176         return 1;
 177 }
 178
 179 int userdiff_config(const char *k, const char *v)
 180 {
 181         struct userdiff_driver *drv;
 182
 183         if ((drv = parse_driver(k, v, "funcname")))
 184                 return parse_funcname(&drv->funcname, k, v, 0);
 185         if ((drv = parse_driver(k, v, "xfuncname")))
 186                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 187         if ((drv = parse_driver(k, v, "binary")))
 188                 return parse_tristate(&drv->binary, k, v);
 189         if ((drv = parse_driver(k, v, "command")))
 190                 return parse_string(&drv->external, k, v);
 191         if ((drv = parse_driver(k, v, "textconv")))
 192                 return parse_string(&drv->textconv, k, v);
 193         if ((drv = parse_driver(k, v, "cachetextconv")))
 194                 return parse_bool(&drv->textconv_want_cache, k, v);
 195         if ((drv = parse_driver(k, v, "wordregex")))
 196                 return parse_string(&drv->word_regex, k, v);
 197
 198         return 0;
 199 }
 200
 201 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 202         int len = strlen(name);
 203         return userdiff_find_by_namelen(name, len);
 204 }
 205
 206 struct userdiff_driver *userdiff_find_by_path(const char *path)
 207 {
 208         static struct git_attr *attr;
 209         struct git_attr_check check;
 210
 211         if (!attr)
 212                 attr = git_attr("diff");
 213         check.attr = attr;
 214
 215         if (!path)
 216                 return NULL;
 217         if (git_checkattr(path, 1, &check))
 218                 return NULL;
 219
 220         if (ATTR_TRUE(check.value))
 221                 return &driver_true;
 222         if (ATTR_FALSE(check.value))
 223                 return &driver_false;
 224         if (ATTR_UNSET(check.value))
 225                 return NULL;
 226         return userdiff_find_by_name(check.value);
 227 }