Andrew's git - gitweb.git/blob

   1#include "userdiff.h"
   2#include "cache.h"
   3#include "attr.h"
   4
   5static struct userdiff_driver *drivers;
   6static int ndrivers;
   7static int drivers_alloc;
   8
   9#define PATTERNS(name, pattern, word_regex)                     \
  10        { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
  11static struct userdiff_driver builtin_drivers[] = {
  12PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  13         "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  14PATTERNS("java",
  15         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  16         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  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]+"),
  23PATTERNS("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].*)$",
  32         /* -- */
  33         "[a-zA-Z_][a-zA-Z0-9_]*"
  34         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  35         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  36         "|[^[:space:]]|[\x80-\xff]+"),
  37PATTERNS("pascal",
  38         "^((procedure|function|constructor|destructor|interface|"
  39                "implementation|initialization|finalization)[ \t]*.*)$"
  40         "\n"
  41         "^(.*=[ \t]*(class|record).*)$",
  42         /* -- */
  43         "[a-zA-Z_][a-zA-Z0-9_]*"
  44         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  45         "|<>|<=|>=|:=|\\.\\."
  46         "|[^[:space:]]|[\x80-\xff]+"),
  47PATTERNS("php", "^[\t ]*((function|class).*)",
  48         /* -- */
  49         "[a-zA-Z_][a-zA-Z0-9_]*"
  50         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  51         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  52         "|[^[:space:]]|[\x80-\xff]+"),
  53PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  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         /* -- */
  60PATTERNS("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]+"),
  66PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  67         "[={}\"]|[^={}\" \t]+"),
  68PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  69         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  70PATTERNS("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
  86static struct userdiff_driver driver_true = {
  87        "diff=true",
  88        NULL,
  89        0,
  90        { NULL, 0 }
  91};
  92
  93static struct userdiff_driver driver_false = {
  94        "!diff",
  95        NULL,
  96        1,
  97        { NULL, 0 }
  98};
  99
 100static 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
 116static 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
 145static 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
 154static 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
 161static 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
 170int 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
 190struct userdiff_driver *userdiff_find_by_name(const char *name) {
 191        int len = strlen(name);
 192        return userdiff_find_by_namelen(name, len);
 193}
 194
 195struct 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}