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