Andrew's git / gitweb.git / userdiff.c
?
userdiff.con commit t7800: readlink may not be available (d2addc3)
   1#include "cache.h"
   2#include "userdiff.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 },            \
  11          word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  12#define IPATTERN(name, pattern, word_regex)                     \
  13        { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
  14          word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  15static struct userdiff_driver builtin_drivers[] = {
  16IPATTERN("ada",
  17         "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
  18         "!^[ \t]*with[ \t].*$\n"
  19         "^[ \t]*((procedure|function)[ \t]+.*)$\n"
  20         "^[ \t]*((package|protected|task)[ \t]+.*)$",
  21         /* -- */
  22         "[a-zA-Z][a-zA-Z0-9_]*"
  23         "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
  24         "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
  25IPATTERN("fortran",
  26         "!^([C*]|[ \t]*!)\n"
  27         "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  28         "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  29                "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  30         /* -- */
  31         "[a-zA-Z][a-zA-Z0-9_]*"
  32         "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  33         /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  34          * Don't worry about format statements without leading digits since
  35          * they would have been matched above as a variable anyway. */
  36         "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  37         "|//|\\*\\*|::|[/<>=]="),
  38PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  39         "[^<>= \t]+"),
  40PATTERNS("java",
  41         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  42         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  43         /* -- */
  44         "[a-zA-Z_][a-zA-Z0-9_]*"
  45         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  46         "|[-+*/<>%&^|=!]="
  47         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  48PATTERNS("matlab",
  49         "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  50         "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  51PATTERNS("objc",
  52         /* Negate C statements that can look like functions */
  53         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  54         /* Objective-C methods */
  55         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  56         /* C functions */
  57         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  58         /* Objective-C class/protocol definitions */
  59         "^(@(implementation|interface|protocol)[ \t].*)$",
  60         /* -- */
  61         "[a-zA-Z_][a-zA-Z0-9_]*"
  62         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  63         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  64PATTERNS("pascal",
  65         "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  66                "implementation|initialization|finalization)[ \t]*.*)$"
  67         "\n"
  68         "^(.*=[ \t]*(class|record).*)$",
  69         /* -- */
  70         "[a-zA-Z_][a-zA-Z0-9_]*"
  71         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  72         "|<>|<=|>=|:=|\\.\\."),
  73PATTERNS("perl",
  74         "^package .*\n"
  75         "^sub [[:alnum:]_':]+[ \t]*"
  76                "(\\([^)]*\\)[ \t]*)?" /* prototype */
  77                /*
  78                 * Attributes.  A regex can't count nested parentheses,
  79                 * so just slurp up whatever we see, taking care not
  80                 * to accept lines like "sub foo; # defined elsewhere".
  81                 *
  82                 * An attribute could contain a semicolon, but at that
  83                 * point it seems reasonable enough to give up.
  84                 */
  85                "(:[^;#]*)?"
  86                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  87                "(#.*)?$\n" /* comment */
  88         "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
  89                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  90                "(#.*)?$\n"
  91         "^=head[0-9] .*",      /* POD */
  92         /* -- */
  93         "[[:alpha:]_'][[:alnum:]_']*"
  94         "|0[xb]?[0-9a-fA-F_]*"
  95         /* taking care not to interpret 3..5 as (3.)(.5) */
  96         "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
  97         "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
  98         "|&&=|\\|\\|=|//=|\\*\\*="
  99         "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 100         "|[-+*/%.^&<>=!|]="
 101         "|=~|!~"
 102         "|<<|<>|<=>|>>"),
 103PATTERNS("php",
 104         "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 105         "^[\t ]*(class.*)$",
 106         /* -- */
 107         "[a-zA-Z_][a-zA-Z0-9_]*"
 108         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 109         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 110PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 111         /* -- */
 112         "[a-zA-Z_][a-zA-Z0-9_]*"
 113         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 114         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 115         /* -- */
 116PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 117         /* -- */
 118         "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 119         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 120         "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 121PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 122         "[={}\"]|[^={}\" \t]+"),
 123PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 124         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 125PATTERNS("cpp",
 126         /* Jump targets or access declarations */
 127         "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 128         /* functions/methods, variables, and compounds at top level */
 129         "^((::[[:space:]]*)?[A-Za-z_].*)$",
 130         /* -- */
 131         "[a-zA-Z_][a-zA-Z0-9_]*"
 132         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 133         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 134PATTERNS("csharp",
 135         /* Keywords */
 136         "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 137         /* Methods and constructors */
 138         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 139         /* Properties */
 140         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 141         /* Type definitions */
 142         "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 143         /* Namespace */
 144         "^[ \t]*(namespace[ \t]+.*)$",
 145         /* -- */
 146         "[a-zA-Z_][a-zA-Z0-9_]*"
 147         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 148         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 149{ "default", NULL, -1, { NULL, 0 } },
 150};
 151#undef PATTERNS
 152#undef IPATTERN
 153
 154static struct userdiff_driver driver_true = {
 155        "diff=true",
 156        NULL,
 157        0,
 158        { NULL, 0 }
 159};
 160
 161static struct userdiff_driver driver_false = {
 162        "!diff",
 163        NULL,
 164        1,
 165        { NULL, 0 }
 166};
 167
 168static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 169{
 170        int i;
 171        for (i = 0; i < ndrivers; i++) {
 172                struct userdiff_driver *drv = drivers + i;
 173                if (!strncmp(drv->name, k, len) && !drv->name[len])
 174                        return drv;
 175        }
 176        for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 177                struct userdiff_driver *drv = builtin_drivers + i;
 178                if (!strncmp(drv->name, k, len) && !drv->name[len])
 179                        return drv;
 180        }
 181        return NULL;
 182}
 183
 184static int parse_funcname(struct userdiff_funcname *f, const char *k,
 185                const char *v, int cflags)
 186{
 187        if (git_config_string(&f->pattern, k, v) < 0)
 188                return -1;
 189        f->cflags = cflags;
 190        return 0;
 191}
 192
 193static int parse_tristate(int *b, const char *k, const char *v)
 194{
 195        if (v && !strcasecmp(v, "auto"))
 196                *b = -1;
 197        else
 198                *b = git_config_bool(k, v);
 199        return 0;
 200}
 201
 202static int parse_bool(int *b, const char *k, const char *v)
 203{
 204        *b = git_config_bool(k, v);
 205        return 0;
 206}
 207
 208int userdiff_config(const char *k, const char *v)
 209{
 210        struct userdiff_driver *drv;
 211        const char *name, *type;
 212        int namelen;
 213
 214        if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 215                return 0;
 216
 217        drv = userdiff_find_by_namelen(name, namelen);
 218        if (!drv) {
 219                ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 220                drv = &drivers[ndrivers++];
 221                memset(drv, 0, sizeof(*drv));
 222                drv->name = xmemdupz(name, namelen);
 223                drv->binary = -1;
 224        }
 225
 226        if (!strcmp(type, "funcname"))
 227                return parse_funcname(&drv->funcname, k, v, 0);
 228        if (!strcmp(type, "xfuncname"))
 229                return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 230        if (!strcmp(type, "binary"))
 231                return parse_tristate(&drv->binary, k, v);
 232        if (!strcmp(type, "command"))
 233                return git_config_string(&drv->external, k, v);
 234        if (!strcmp(type, "textconv"))
 235                return git_config_string(&drv->textconv, k, v);
 236        if (!strcmp(type, "cachetextconv"))
 237                return parse_bool(&drv->textconv_want_cache, k, v);
 238        if (!strcmp(type, "wordregex"))
 239                return git_config_string(&drv->word_regex, k, v);
 240
 241        return 0;
 242}
 243
 244struct userdiff_driver *userdiff_find_by_name(const char *name) {
 245        int len = strlen(name);
 246        return userdiff_find_by_namelen(name, len);
 247}
 248
 249struct userdiff_driver *userdiff_find_by_path(const char *path)
 250{
 251        static struct git_attr *attr;
 252        struct git_attr_check check;
 253
 254        if (!attr)
 255                attr = git_attr("diff");
 256        check.attr = attr;
 257
 258        if (!path)
 259                return NULL;
 260        if (git_check_attr(path, 1, &check))
 261                return NULL;
 262
 263        if (ATTR_TRUE(check.value))
 264                return &driver_true;
 265        if (ATTR_FALSE(check.value))
 266                return &driver_false;
 267        if (ATTR_UNSET(check.value))
 268                return NULL;
 269        return userdiff_find_by_name(check.value);
 270}
 271
 272struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 273{
 274        if (!driver->textconv)
 275                return NULL;
 276
 277        if (driver->textconv_want_cache && !driver->textconv_cache) {
 278                struct notes_cache *c = xmalloc(sizeof(*c));
 279                struct strbuf name = STRBUF_INIT;
 280
 281                strbuf_addf(&name, "textconv/%s", driver->name);
 282                notes_cache_init(c, name.buf, driver->textconv);
 283                driver->textconv_cache = c;
 284        }
 285
 286        return driver;
 287}