Andrew's git / gitweb.git / userdiff.c
?
userdiff.con commit unpack-trees: handle lstat failure for existing directory (92fda79)
   1#include "cache.h"
   2#include "userdiff.h"
   3#include "cache.h"
   4#include "attr.h"
   5
   6static struct userdiff_driver *drivers;
   7static int ndrivers;
   8static int drivers_alloc;
   9
  10#define PATTERNS(name, pattern, word_regex)                     \
  11        { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
  12#define IPATTERN(name, pattern, word_regex)                     \
  13        { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, word_regex }
  14static struct userdiff_driver builtin_drivers[] = {
  15IPATTERN("fortran",
  16         "!^([C*]|[ \t]*!)\n"
  17         "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  18         "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  19                "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  20         /* -- */
  21         "[a-zA-Z][a-zA-Z0-9_]*"
  22         "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  23         /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  24          * Don't worry about format statements without leading digits since
  25          * they would have been matched above as a variable anyway. */
  26         "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  27         "|//|\\*\\*|::|[/<>=]="
  28         "|[^[:space:]]|[\x80-\xff]+"),
  29PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  30         "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  31PATTERNS("java",
  32         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  33         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  34         /* -- */
  35         "[a-zA-Z_][a-zA-Z0-9_]*"
  36         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  37         "|[-+*/<>%&^|=!]="
  38         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
  39         "|[^[:space:]]|[\x80-\xff]+"),
  40PATTERNS("objc",
  41         /* Negate C statements that can look like functions */
  42         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  43         /* Objective-C methods */
  44         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  45         /* C functions */
  46         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  47         /* Objective-C class/protocol definitions */
  48         "^(@(implementation|interface|protocol)[ \t].*)$",
  49         /* -- */
  50         "[a-zA-Z_][a-zA-Z0-9_]*"
  51         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  52         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  53         "|[^[:space:]]|[\x80-\xff]+"),
  54PATTERNS("pascal",
  55         "^((procedure|function|constructor|destructor|interface|"
  56                "implementation|initialization|finalization)[ \t]*.*)$"
  57         "\n"
  58         "^(.*=[ \t]*(class|record).*)$",
  59         /* -- */
  60         "[a-zA-Z_][a-zA-Z0-9_]*"
  61         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  62         "|<>|<=|>=|:=|\\.\\."
  63         "|[^[:space:]]|[\x80-\xff]+"),
  64PATTERNS("php",
  65         "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
  66         "^[\t ]*(class.*)$",
  67         /* -- */
  68         "[a-zA-Z_][a-zA-Z0-9_]*"
  69         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  70         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  71         "|[^[:space:]]|[\x80-\xff]+"),
  72PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  73         /* -- */
  74         "[a-zA-Z_][a-zA-Z0-9_]*"
  75         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  76         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  77         "|[^[:space:]]|[\x80-\xff]+"),
  78         /* -- */
  79PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  80         /* -- */
  81         "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
  82         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
  83         "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
  84         "|[^[:space:]]|[\x80-\xff]+"),
  85PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  86         "[={}\"]|[^={}\" \t]+"),
  87PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  88         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  89PATTERNS("cpp",
  90         /* Jump targets or access declarations */
  91         "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
  92         /* C/++ functions/methods at top level */
  93         "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
  94         /* compound type at top level */
  95         "^((struct|class|enum)[^;]*)$",
  96         /* -- */
  97         "[a-zA-Z_][a-zA-Z0-9_]*"
  98         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  99         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
 100         "|[^[:space:]]|[\x80-\xff]+"),
 101PATTERNS("csharp",
 102         /* Keywords */
 103         "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 104         /* Methods and constructors */
 105         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 106         /* Properties */
 107         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 108         /* Type definitions */
 109         "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 110         /* Namespace */
 111         "^[ \t]*(namespace[ \t]+.*)$",
 112         /* -- */
 113         "[a-zA-Z_][a-zA-Z0-9_]*"
 114         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 115         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
 116         "|[^[:space:]]|[\x80-\xff]+"),
 117{ "default", NULL, -1, { NULL, 0 } },
 118};
 119#undef PATTERNS
 120#undef IPATTERN
 121
 122static struct userdiff_driver driver_true = {
 123        "diff=true",
 124        NULL,
 125        0,
 126        { NULL, 0 }
 127};
 128
 129static struct userdiff_driver driver_false = {
 130        "!diff",
 131        NULL,
 132        1,
 133        { NULL, 0 }
 134};
 135
 136static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 137{
 138        int i;
 139        for (i = 0; i < ndrivers; i++) {
 140                struct userdiff_driver *drv = drivers + i;
 141                if (!strncmp(drv->name, k, len) && !drv->name[len])
 142                        return drv;
 143        }
 144        for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 145                struct userdiff_driver *drv = builtin_drivers + i;
 146                if (!strncmp(drv->name, k, len) && !drv->name[len])
 147                        return drv;
 148        }
 149        return NULL;
 150}
 151
 152static struct userdiff_driver *parse_driver(const char *var,
 153                const char *value, const char *type)
 154{
 155        struct userdiff_driver *drv;
 156        const char *dot;
 157        const char *name;
 158        int namelen;
 159
 160        if (prefixcmp(var, "diff."))
 161                return NULL;
 162        dot = strrchr(var, '.');
 163        if (dot == var + 4)
 164                return NULL;
 165        if (strcmp(type, dot+1))
 166                return NULL;
 167
 168        name = var + 5;
 169        namelen = dot - name;
 170        drv = userdiff_find_by_namelen(name, namelen);
 171        if (!drv) {
 172                ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 173                drv = &drivers[ndrivers++];
 174                memset(drv, 0, sizeof(*drv));
 175                drv->name = xmemdupz(name, namelen);
 176                drv->binary = -1;
 177        }
 178        return drv;
 179}
 180
 181static int parse_funcname(struct userdiff_funcname *f, const char *k,
 182                const char *v, int cflags)
 183{
 184        if (git_config_string(&f->pattern, k, v) < 0)
 185                return -1;
 186        f->cflags = cflags;
 187        return 1;
 188}
 189
 190static int parse_string(const char **d, const char *k, const char *v)
 191{
 192        if (git_config_string(d, k, v) < 0)
 193                return -1;
 194        return 1;
 195}
 196
 197static int parse_tristate(int *b, const char *k, const char *v)
 198{
 199        if (v && !strcasecmp(v, "auto"))
 200                *b = -1;
 201        else
 202                *b = git_config_bool(k, v);
 203        return 1;
 204}
 205
 206static int parse_bool(int *b, const char *k, const char *v)
 207{
 208        *b = git_config_bool(k, v);
 209        return 1;
 210}
 211
 212int userdiff_config(const char *k, const char *v)
 213{
 214        struct userdiff_driver *drv;
 215
 216        if ((drv = parse_driver(k, v, "funcname")))
 217                return parse_funcname(&drv->funcname, k, v, 0);
 218        if ((drv = parse_driver(k, v, "xfuncname")))
 219                return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 220        if ((drv = parse_driver(k, v, "binary")))
 221                return parse_tristate(&drv->binary, k, v);
 222        if ((drv = parse_driver(k, v, "command")))
 223                return parse_string(&drv->external, k, v);
 224        if ((drv = parse_driver(k, v, "textconv")))
 225                return parse_string(&drv->textconv, k, v);
 226        if ((drv = parse_driver(k, v, "cachetextconv")))
 227                return parse_bool(&drv->textconv_want_cache, k, v);
 228        if ((drv = parse_driver(k, v, "wordregex")))
 229                return parse_string(&drv->word_regex, k, v);
 230
 231        return 0;
 232}
 233
 234struct userdiff_driver *userdiff_find_by_name(const char *name) {
 235        int len = strlen(name);
 236        return userdiff_find_by_namelen(name, len);
 237}
 238
 239struct userdiff_driver *userdiff_find_by_path(const char *path)
 240{
 241        static struct git_attr *attr;
 242        struct git_attr_check check;
 243
 244        if (!attr)
 245                attr = git_attr("diff");
 246        check.attr = attr;
 247
 248        if (!path)
 249                return NULL;
 250        if (git_checkattr(path, 1, &check))
 251                return NULL;
 252
 253        if (ATTR_TRUE(check.value))
 254                return &driver_true;
 255        if (ATTR_FALSE(check.value))
 256                return &driver_false;
 257        if (ATTR_UNSET(check.value))
 258                return NULL;
 259        return userdiff_find_by_name(check.value);
 260}