Andrew's git / gitweb.git / userdiff.c
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userdiff.con commit t/lib-diff-alternative: abstract away SHA-1-specific constants (d29d500)
   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("golang",
  42         /* Functions */
  43         "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
  44         /* Structs and interfaces */
  45         "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
  46         /* -- */
  47         "[a-zA-Z_][a-zA-Z0-9_]*"
  48         "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
  49         "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
  50PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
  51         "[^<>= \t]+"),
  52PATTERNS("java",
  53         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  54         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  55         /* -- */
  56         "[a-zA-Z_][a-zA-Z0-9_]*"
  57         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  58         "|[-+*/<>%&^|=!]="
  59         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
  60PATTERNS("matlab",
  61         "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
  62         "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
  63PATTERNS("objc",
  64         /* Negate C statements that can look like functions */
  65         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  66         /* Objective-C methods */
  67         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  68         /* C functions */
  69         "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  70         /* Objective-C class/protocol definitions */
  71         "^(@(implementation|interface|protocol)[ \t].*)$",
  72         /* -- */
  73         "[a-zA-Z_][a-zA-Z0-9_]*"
  74         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  75         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  76PATTERNS("pascal",
  77         "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
  78                "implementation|initialization|finalization)[ \t]*.*)$"
  79         "\n"
  80         "^(.*=[ \t]*(class|record).*)$",
  81         /* -- */
  82         "[a-zA-Z_][a-zA-Z0-9_]*"
  83         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  84         "|<>|<=|>=|:=|\\.\\."),
  85PATTERNS("perl",
  86         "^package .*\n"
  87         "^sub [[:alnum:]_':]+[ \t]*"
  88                "(\\([^)]*\\)[ \t]*)?" /* prototype */
  89                /*
  90                 * Attributes.  A regex can't count nested parentheses,
  91                 * so just slurp up whatever we see, taking care not
  92                 * to accept lines like "sub foo; # defined elsewhere".
  93                 *
  94                 * An attribute could contain a semicolon, but at that
  95                 * point it seems reasonable enough to give up.
  96                 */
  97                "(:[^;#]*)?"
  98                "(\\{[ \t]*)?" /* brace can come here or on the next line */
  99                "(#.*)?$\n" /* comment */
 100         "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
 101                "(\\{[ \t]*)?" /* brace can come here or on the next line */
 102                "(#.*)?$\n"
 103         "^=head[0-9] .*",      /* POD */
 104         /* -- */
 105         "[[:alpha:]_'][[:alnum:]_']*"
 106         "|0[xb]?[0-9a-fA-F_]*"
 107         /* taking care not to interpret 3..5 as (3.)(.5) */
 108         "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 109         "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 110         "|&&=|\\|\\|=|//=|\\*\\*="
 111         "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 112         "|[-+*/%.^&<>=!|]="
 113         "|=~|!~"
 114         "|<<|<>|<=>|>>"),
 115PATTERNS("php",
 116         "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 117         "^[\t ]*(class.*)$",
 118         /* -- */
 119         "[a-zA-Z_][a-zA-Z0-9_]*"
 120         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 121         "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 122PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 123         /* -- */
 124         "[a-zA-Z_][a-zA-Z0-9_]*"
 125         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 126         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 127         /* -- */
 128PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 129         /* -- */
 130         "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 131         "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 132         "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 133PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 134         "[={}\"]|[^={}\" \t]+"),
 135PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 136         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 137PATTERNS("cpp",
 138         /* Jump targets or access declarations */
 139         "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
 140         /* functions/methods, variables, and compounds at top level */
 141         "^((::[[:space:]]*)?[A-Za-z_].*)$",
 142         /* -- */
 143         "[a-zA-Z_][a-zA-Z0-9_]*"
 144         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
 145         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
 146PATTERNS("csharp",
 147         /* Keywords */
 148         "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 149         /* Methods and constructors */
 150         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
 151         /* Properties */
 152         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
 153         /* Type definitions */
 154         "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
 155         /* Namespace */
 156         "^[ \t]*(namespace[ \t]+.*)$",
 157         /* -- */
 158         "[a-zA-Z_][a-zA-Z0-9_]*"
 159         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 160         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 161IPATTERN("css",
 162         "![:;][[:space:]]*$\n"
 163         "^[_a-z0-9].*$",
 164         /* -- */
 165         /*
 166          * This regex comes from W3C CSS specs. Should theoretically also
 167          * allow ISO 10646 characters U+00A0 and higher,
 168          * but they are not handled in this regex.
 169          */
 170         "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 171         "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 172),
 173{ "default", NULL, -1, { NULL, 0 } },
 174};
 175#undef PATTERNS
 176#undef IPATTERN
 177
 178static struct userdiff_driver driver_true = {
 179        "diff=true",
 180        NULL,
 181        0,
 182        { NULL, 0 }
 183};
 184
 185static struct userdiff_driver driver_false = {
 186        "!diff",
 187        NULL,
 188        1,
 189        { NULL, 0 }
 190};
 191
 192static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 193{
 194        int i;
 195        for (i = 0; i < ndrivers; i++) {
 196                struct userdiff_driver *drv = drivers + i;
 197                if (!strncmp(drv->name, k, len) && !drv->name[len])
 198                        return drv;
 199        }
 200        for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 201                struct userdiff_driver *drv = builtin_drivers + i;
 202                if (!strncmp(drv->name, k, len) && !drv->name[len])
 203                        return drv;
 204        }
 205        return NULL;
 206}
 207
 208static int parse_funcname(struct userdiff_funcname *f, const char *k,
 209                const char *v, int cflags)
 210{
 211        if (git_config_string(&f->pattern, k, v) < 0)
 212                return -1;
 213        f->cflags = cflags;
 214        return 0;
 215}
 216
 217static int parse_tristate(int *b, const char *k, const char *v)
 218{
 219        if (v && !strcasecmp(v, "auto"))
 220                *b = -1;
 221        else
 222                *b = git_config_bool(k, v);
 223        return 0;
 224}
 225
 226static int parse_bool(int *b, const char *k, const char *v)
 227{
 228        *b = git_config_bool(k, v);
 229        return 0;
 230}
 231
 232int userdiff_config(const char *k, const char *v)
 233{
 234        struct userdiff_driver *drv;
 235        const char *name, *type;
 236        int namelen;
 237
 238        if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 239                return 0;
 240
 241        drv = userdiff_find_by_namelen(name, namelen);
 242        if (!drv) {
 243                ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 244                drv = &drivers[ndrivers++];
 245                memset(drv, 0, sizeof(*drv));
 246                drv->name = xmemdupz(name, namelen);
 247                drv->binary = -1;
 248        }
 249
 250        if (!strcmp(type, "funcname"))
 251                return parse_funcname(&drv->funcname, k, v, 0);
 252        if (!strcmp(type, "xfuncname"))
 253                return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 254        if (!strcmp(type, "binary"))
 255                return parse_tristate(&drv->binary, k, v);
 256        if (!strcmp(type, "command"))
 257                return git_config_string(&drv->external, k, v);
 258        if (!strcmp(type, "textconv"))
 259                return git_config_string(&drv->textconv, k, v);
 260        if (!strcmp(type, "cachetextconv"))
 261                return parse_bool(&drv->textconv_want_cache, k, v);
 262        if (!strcmp(type, "wordregex"))
 263                return git_config_string(&drv->word_regex, k, v);
 264
 265        return 0;
 266}
 267
 268struct userdiff_driver *userdiff_find_by_name(const char *name) {
 269        int len = strlen(name);
 270        return userdiff_find_by_namelen(name, len);
 271}
 272
 273struct userdiff_driver *userdiff_find_by_path(const char *path)
 274{
 275        static struct attr_check *check;
 276
 277        if (!check)
 278                check = attr_check_initl("diff", NULL);
 279        if (!path)
 280                return NULL;
 281        if (git_check_attr(path, check))
 282                return NULL;
 283
 284        if (ATTR_TRUE(check->items[0].value))
 285                return &driver_true;
 286        if (ATTR_FALSE(check->items[0].value))
 287                return &driver_false;
 288        if (ATTR_UNSET(check->items[0].value))
 289                return NULL;
 290        return userdiff_find_by_name(check->items[0].value);
 291}
 292
 293struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
 294{
 295        if (!driver->textconv)
 296                return NULL;
 297
 298        if (driver->textconv_want_cache && !driver->textconv_cache) {
 299                struct notes_cache *c = xmalloc(sizeof(*c));
 300                struct strbuf name = STRBUF_INIT;
 301
 302                strbuf_addf(&name, "textconv/%s", driver->name);
 303                notes_cache_init(c, name.buf, driver->textconv);
 304                driver->textconv_cache = c;
 305                strbuf_release(&name);
 306        }
 307
 308        return driver;
 309}