Andrew's git / gitweb.git / userdiff.c
?
userdiff.con commit cherry-pick: allow "-" as abbreviation of '@{-1}' (182d7dc)
   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 },            \
  12          word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  13#define IPATTERN(name, pattern, word_regex)                     \
  14        { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
  15          word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
  16static struct userdiff_driver builtin_drivers[] = {
  17IPATTERN("ada",
  18         "!^(.*[ \t])?(is new|renames|is separate)([ \t].*)?$\n"
  19         "!^[ \t]*with[ \t].*$\n"
  20         "^[ \t]*((procedure|function)[ \t]+.*)$\n"
  21         "^[ \t]*((package|protected|task)[ \t]+.*)$",
  22         /* -- */
  23         "[a-zA-Z][a-zA-Z0-9_]*"
  24         "|[0-9][-+0-9#_.eE]"
  25         "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
  26IPATTERN("fortran",
  27         "!^([C*]|[ \t]*!)\n"
  28         "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
  29         "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
  30                "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
  31         /* -- */
  32         "[a-zA-Z][a-zA-Z0-9_]*"
  33         "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  34         /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  35          * Don't worry about format statements without leading digits since
  36          * they would have been matched above as a variable anyway. */
  37         "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  38         "|//|\\*\\*|::|[/<>=]="),
  39PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  40         "[^<>= \t]+"),
  41PATTERNS("java",
  42         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  43         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  44         /* -- */
  45         "[a-zA-Z_][a-zA-Z0-9_]*"
  46         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  47         "|[-+*/<>%&^|=!]="
  48         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  49PATTERNS("matlab",
  50         "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  51         "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  52PATTERNS("objc",
  53         /* Negate C statements that can look like functions */
  54         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  55         /* Objective-C methods */
  56         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  57         /* C functions */
  58         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  59         /* Objective-C class/protocol definitions */
  60         "^(@(implementation|interface|protocol)[ \t].*)$",
  61         /* -- */
  62         "[a-zA-Z_][a-zA-Z0-9_]*"
  63         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  64         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  65PATTERNS("pascal",
  66         "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  67                "implementation|initialization|finalization)[ \t]*.*)$"
  68         "\n"
  69         "^(.*=[ \t]*(class|record).*)$",
  70         /* -- */
  71         "[a-zA-Z_][a-zA-Z0-9_]*"
  72         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  73         "|<>|<=|>=|:=|\\.\\."),
  74PATTERNS("perl",
  75         "^package .*\n"
  76         "^sub [[:alnum:]_':]+[ \t]*"
  77                "(\\([^)]*\\)[ \t]*)?" /* prototype */
  78                /*
  79                 * Attributes.  A regex can't count nested parentheses,
  80                 * so just slurp up whatever we see, taking care not
  81                 * to accept lines like "sub foo; # defined elsewhere".
  82                 *
  83                 * An attribute could contain a semicolon, but at that
  84                 * point it seems reasonable enough to give up.
  85                 */
  86                "(:[^;#]*)?"
  87                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  88                "(#.*)?$\n" /* comment */
  89         "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
  90                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  91                "(#.*)?$\n"
  92         "^=head[0-9] .*",      /* POD */
  93         /* -- */
  94         "[[:alpha:]_'][[:alnum:]_']*"
  95         "|0[xb]?[0-9a-fA-F_]*"
  96         /* taking care not to interpret 3..5 as (3.)(.5) */
  97         "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
  98         "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
  99         "|&&=|\\|\\|=|//=|\\*\\*="
 100         "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 101         "|[-+*/%.^&<>=!|]="
 102         "|=~|!~"
 103         "|<<|<>|<=>|>>"),
 104PATTERNS("php",
 105         "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 106         "^[\t ]*(class.*)$",
 107         /* -- */
 108         "[a-zA-Z_][a-zA-Z0-9_]*"
 109         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 110         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 111PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 112         /* -- */
 113         "[a-zA-Z_][a-zA-Z0-9_]*"
 114         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 115         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 116         /* -- */
 117PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 118         /* -- */
 119         "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 120         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 121         "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 122PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 123         "[={}\"]|[^={}\" \t]+"),
 124PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 125         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 126PATTERNS("cpp",
 127         /* Jump targets or access declarations */
 128         "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
 129         /* C/++ functions/methods at top level */
 130         "^([A-Za-z_][A-Za-z_0-9]*([ \t*]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
 131         /* compound type at top level */
 132         "^((struct|class|enum)[^;]*)$",
 133         /* -- */
 134         "[a-zA-Z_][a-zA-Z0-9_]*"
 135         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 136         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 137PATTERNS("csharp",
 138         /* Keywords */
 139         "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 140         /* Methods and constructors */
 141         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 142         /* Properties */
 143         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 144         /* Type definitions */
 145         "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 146         /* Namespace */
 147         "^[ \t]*(namespace[ \t]+.*)$",
 148         /* -- */
 149         "[a-zA-Z_][a-zA-Z0-9_]*"
 150         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 151         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 152{ "default", NULL, -1, { NULL, 0 } },
 153};
 154#undef PATTERNS
 155#undef IPATTERN
 156
 157static struct userdiff_driver driver_true = {
 158        "diff=true",
 159        NULL,
 160        0,
 161        { NULL, 0 }
 162};
 163
 164static struct userdiff_driver driver_false = {
 165        "!diff",
 166        NULL,
 167        1,
 168        { NULL, 0 }
 169};
 170
 171static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 172{
 173        int i;
 174        for (i = 0; i < ndrivers; i++) {
 175                struct userdiff_driver *drv = drivers + i;
 176                if (!strncmp(drv->name, k, len) && !drv->name[len])
 177                        return drv;
 178        }
 179        for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 180                struct userdiff_driver *drv = builtin_drivers + i;
 181                if (!strncmp(drv->name, k, len) && !drv->name[len])
 182                        return drv;
 183        }
 184        return NULL;
 185}
 186
 187static int parse_funcname(struct userdiff_funcname *f, const char *k,
 188                const char *v, int cflags)
 189{
 190        if (git_config_string(&f->pattern, k, v) < 0)
 191                return -1;
 192        f->cflags = cflags;
 193        return 0;
 194}
 195
 196static int parse_tristate(int *b, const char *k, const char *v)
 197{
 198        if (v && !strcasecmp(v, "auto"))
 199                *b = -1;
 200        else
 201                *b = git_config_bool(k, v);
 202        return 0;
 203}
 204
 205static int parse_bool(int *b, const char *k, const char *v)
 206{
 207        *b = git_config_bool(k, v);
 208        return 0;
 209}
 210
 211int userdiff_config(const char *k, const char *v)
 212{
 213        struct userdiff_driver *drv;
 214        const char *name, *type;
 215        int namelen;
 216
 217        if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 218                return 0;
 219
 220        drv = userdiff_find_by_namelen(name, namelen);
 221        if (!drv) {
 222                ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 223                drv = &drivers[ndrivers++];
 224                memset(drv, 0, sizeof(*drv));
 225                drv->name = xmemdupz(name, namelen);
 226                drv->binary = -1;
 227        }
 228
 229        if (!strcmp(type, "funcname"))
 230                return parse_funcname(&drv->funcname, k, v, 0);
 231        if (!strcmp(type, "xfuncname"))
 232                return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 233        if (!strcmp(type, "binary"))
 234                return parse_tristate(&drv->binary, k, v);
 235        if (!strcmp(type, "command"))
 236                return git_config_string(&drv->external, k, v);
 237        if (!strcmp(type, "textconv"))
 238                return git_config_string(&drv->textconv, k, v);
 239        if (!strcmp(type, "cachetextconv"))
 240                return parse_bool(&drv->textconv_want_cache, k, v);
 241        if (!strcmp(type, "wordregex"))
 242                return git_config_string(&drv->word_regex, k, v);
 243
 244        return 0;
 245}
 246
 247struct userdiff_driver *userdiff_find_by_name(const char *name) {
 248        int len = strlen(name);
 249        return userdiff_find_by_namelen(name, len);
 250}
 251
 252struct userdiff_driver *userdiff_find_by_path(const char *path)
 253{
 254        static struct git_attr *attr;
 255        struct git_attr_check check;
 256
 257        if (!attr)
 258                attr = git_attr("diff");
 259        check.attr = attr;
 260
 261        if (!path)
 262                return NULL;
 263        if (git_check_attr(path, 1, &check))
 264                return NULL;
 265
 266        if (ATTR_TRUE(check.value))
 267                return &driver_true;
 268        if (ATTR_FALSE(check.value))
 269                return &driver_false;
 270        if (ATTR_UNSET(check.value))
 271                return NULL;
 272        return userdiff_find_by_name(check.value);
 273}
 274
 275struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 276{
 277        if (!driver->textconv)
 278                return NULL;
 279
 280        if (driver->textconv_want_cache && !driver->textconv_cache) {
 281                struct notes_cache *c = xmalloc(sizeof(*c));
 282                struct strbuf name = STRBUF_INIT;
 283
 284                strbuf_addf(&name, "textconv/%s", driver->name);
 285                notes_cache_init(c, name.buf, driver->textconv);
 286                driver->textconv_cache = c;
 287        }
 288
 289        return driver;
 290}