Andrew's git / gitweb.git / userdiff.c
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userdiff.con commit fsck: fix leak when traversing trees (ba3a08c)
   1#include "cache.h"
   2#include "config.h"
   3#include "userdiff.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[ \t]+new|renames|is[ \t]+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#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
  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].*)$",
  31         /* -- */
  32         "[a-zA-Z][a-zA-Z0-9_]*"
  33         "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  34         /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  35          * Don't worry about format statements without leading digits since
  36          * they would have been matched above as a variable anyway. */
  37         "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  38         "|//|\\*\\*|::|[/<>=]="),
  39IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
  40         "[^ \t-]+"),
  41PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  42         "[^<>= \t]+"),
  43PATTERNS("java",
  44         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  45         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  46         /* -- */
  47         "[a-zA-Z_][a-zA-Z0-9_]*"
  48         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  49         "|[-+*/<>%&^|=!]="
  50         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  51PATTERNS("matlab",
  52         "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  53         "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  54PATTERNS("objc",
  55         /* Negate C statements that can look like functions */
  56         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  57         /* Objective-C methods */
  58         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  59         /* C functions */
  60         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  61         /* Objective-C class/protocol definitions */
  62         "^(@(implementation|interface|protocol)[ \t].*)$",
  63         /* -- */
  64         "[a-zA-Z_][a-zA-Z0-9_]*"
  65         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  66         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  67PATTERNS("pascal",
  68         "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  69                "implementation|initialization|finalization)[ \t]*.*)$"
  70         "\n"
  71         "^(.*=[ \t]*(class|record).*)$",
  72         /* -- */
  73         "[a-zA-Z_][a-zA-Z0-9_]*"
  74         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  75         "|<>|<=|>=|:=|\\.\\."),
  76PATTERNS("perl",
  77         "^package .*\n"
  78         "^sub [[:alnum:]_':]+[ \t]*"
  79                "(\\([^)]*\\)[ \t]*)?" /* prototype */
  80                /*
  81                 * Attributes.  A regex can't count nested parentheses,
  82                 * so just slurp up whatever we see, taking care not
  83                 * to accept lines like "sub foo; # defined elsewhere".
  84                 *
  85                 * An attribute could contain a semicolon, but at that
  86                 * point it seems reasonable enough to give up.
  87                 */
  88                "(:[^;#]*)?"
  89                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  90                "(#.*)?$\n" /* comment */
  91         "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
  92                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  93                "(#.*)?$\n"
  94         "^=head[0-9] .*",      /* POD */
  95         /* -- */
  96         "[[:alpha:]_'][[:alnum:]_']*"
  97         "|0[xb]?[0-9a-fA-F_]*"
  98         /* taking care not to interpret 3..5 as (3.)(.5) */
  99         "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 100         "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 101         "|&&=|\\|\\|=|//=|\\*\\*="
 102         "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 103         "|[-+*/%.^&<>=!|]="
 104         "|=~|!~"
 105         "|<<|<>|<=>|>>"),
 106PATTERNS("php",
 107         "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 108         "^[\t ]*(class.*)$",
 109         /* -- */
 110         "[a-zA-Z_][a-zA-Z0-9_]*"
 111         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 112         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 113PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 114         /* -- */
 115         "[a-zA-Z_][a-zA-Z0-9_]*"
 116         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 117         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 118         /* -- */
 119PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 120         /* -- */
 121         "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 122         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 123         "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 124PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 125         "[={}\"]|[^={}\" \t]+"),
 126PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 127         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 128PATTERNS("cpp",
 129         /* Jump targets or access declarations */
 130         "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 131         /* functions/methods, variables, and compounds at top level */
 132         "^((::[[:space:]]*)?[A-Za-z_].*)$",
 133         /* -- */
 134         "[a-zA-Z_][a-zA-Z0-9_]*"
 135         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 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         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 152IPATTERN("css",
 153         "![:;][[:space:]]*$\n"
 154         "^[_a-z0-9].*$",
 155         /* -- */
 156         /*
 157          * This regex comes from W3C CSS specs. Should theoretically also
 158          * allow ISO 10646 characters U+00A0 and higher,
 159          * but they are not handled in this regex.
 160          */
 161         "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 162         "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 163),
 164{ "default", NULL, -1, { NULL, 0 } },
 165};
 166#undef PATTERNS
 167#undef IPATTERN
 168
 169static struct userdiff_driver driver_true = {
 170        "diff=true",
 171        NULL,
 172        0,
 173        { NULL, 0 }
 174};
 175
 176static struct userdiff_driver driver_false = {
 177        "!diff",
 178        NULL,
 179        1,
 180        { NULL, 0 }
 181};
 182
 183static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 184{
 185        int i;
 186        for (i = 0; i < ndrivers; i++) {
 187                struct userdiff_driver *drv = drivers + i;
 188                if (!strncmp(drv->name, k, len) && !drv->name[len])
 189                        return drv;
 190        }
 191        for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 192                struct userdiff_driver *drv = builtin_drivers + i;
 193                if (!strncmp(drv->name, k, len) && !drv->name[len])
 194                        return drv;
 195        }
 196        return NULL;
 197}
 198
 199static int parse_funcname(struct userdiff_funcname *f, const char *k,
 200                const char *v, int cflags)
 201{
 202        if (git_config_string(&f->pattern, k, v) < 0)
 203                return -1;
 204        f->cflags = cflags;
 205        return 0;
 206}
 207
 208static int parse_tristate(int *b, const char *k, const char *v)
 209{
 210        if (v && !strcasecmp(v, "auto"))
 211                *b = -1;
 212        else
 213                *b = git_config_bool(k, v);
 214        return 0;
 215}
 216
 217static int parse_bool(int *b, const char *k, const char *v)
 218{
 219        *b = git_config_bool(k, v);
 220        return 0;
 221}
 222
 223int userdiff_config(const char *k, const char *v)
 224{
 225        struct userdiff_driver *drv;
 226        const char *name, *type;
 227        int namelen;
 228
 229        if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 230                return 0;
 231
 232        drv = userdiff_find_by_namelen(name, namelen);
 233        if (!drv) {
 234                ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 235                drv = &drivers[ndrivers++];
 236                memset(drv, 0, sizeof(*drv));
 237                drv->name = xmemdupz(name, namelen);
 238                drv->binary = -1;
 239        }
 240
 241        if (!strcmp(type, "funcname"))
 242                return parse_funcname(&drv->funcname, k, v, 0);
 243        if (!strcmp(type, "xfuncname"))
 244                return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 245        if (!strcmp(type, "binary"))
 246                return parse_tristate(&drv->binary, k, v);
 247        if (!strcmp(type, "command"))
 248                return git_config_string(&drv->external, k, v);
 249        if (!strcmp(type, "textconv"))
 250                return git_config_string(&drv->textconv, k, v);
 251        if (!strcmp(type, "cachetextconv"))
 252                return parse_bool(&drv->textconv_want_cache, k, v);
 253        if (!strcmp(type, "wordregex"))
 254                return git_config_string(&drv->word_regex, k, v);
 255
 256        return 0;
 257}
 258
 259struct userdiff_driver *userdiff_find_by_name(const char *name) {
 260        int len = strlen(name);
 261        return userdiff_find_by_namelen(name, len);
 262}
 263
 264struct userdiff_driver *userdiff_find_by_path(const char *path)
 265{
 266        static struct attr_check *check;
 267
 268        if (!check)
 269                check = attr_check_initl("diff", NULL);
 270        if (!path)
 271                return NULL;
 272        if (git_check_attr(path, check))
 273                return NULL;
 274
 275        if (ATTR_TRUE(check->items[0].value))
 276                return &driver_true;
 277        if (ATTR_FALSE(check->items[0].value))
 278                return &driver_false;
 279        if (ATTR_UNSET(check->items[0].value))
 280                return NULL;
 281        return userdiff_find_by_name(check->items[0].value);
 282}
 283
 284struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 285{
 286        if (!driver->textconv)
 287                return NULL;
 288
 289        if (driver->textconv_want_cache && !driver->textconv_cache) {
 290                struct notes_cache *c = xmalloc(sizeof(*c));
 291                struct strbuf name = STRBUF_INIT;
 292
 293                strbuf_addf(&name, "textconv/%s", driver->name);
 294                notes_cache_init(c, name.buf, driver->textconv);
 295                driver->textconv_cache = c;
 296        }
 297
 298        return driver;
 299}