Merge branch 'dj/typofix-merge-strat'
[git] / userdiff.c
1 #include "cache.h"
2 #include "config.h"
3 #include "userdiff.h"
4 #include "attr.h"
5
6 static struct userdiff_driver *drivers;
7 static int ndrivers;
8 static 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]+" }
16 static struct userdiff_driver builtin_drivers[] = {
17 IPATTERN("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          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
26 PATTERNS("dts",
27          "!;\n"
28          "!=\n"
29          /* lines beginning with a word optionally preceded by '&' or the root */
30          "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)",
31          /* -- */
32          /* Property names and math operators */
33          "[a-zA-Z0-9,._+?#-]+"
34          "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"),
35 PATTERNS("elixir",
36          "^[ \t]*((def(macro|module|impl|protocol|p)?|test)[ \t].*)$",
37          /* Atoms, names, and module attributes */
38          "|[@:]?[a-zA-Z0-9@_?!]+"
39          /* Numbers with specific base */
40          "|[-+]?0[xob][0-9a-fA-F]+"
41          /* Numbers */
42          "|[-+]?[0-9][0-9_.]*([eE][-+]?[0-9_]+)?"
43          /* Operators and atoms that represent them */
44          "|:?(\\+\\+|--|\\.\\.|~~~|<>|\\^\\^\\^|<?\\|>|<<<?|>?>>|<<?~|~>?>|<~>|<=|>=|===?|!==?|=~|&&&?|\\|\\|\\|?|=>|<-|\\\\\\\\|->)"
45          /* Not real operators, but should be grouped */
46          "|:?%[A-Za-z0-9_.]\\{\\}?"),
47 IPATTERN("fortran",
48          "!^([C*]|[ \t]*!)\n"
49          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
50          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
51                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
52          /* -- */
53          "[a-zA-Z][a-zA-Z0-9_]*"
54          "|\\.([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])\\."
55          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
56           * Don't worry about format statements without leading digits since
57           * they would have been matched above as a variable anyway. */
58          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
59          "|//|\\*\\*|::|[/<>=]="),
60 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
61          "[^ \t-]+"),
62 PATTERNS("golang",
63          /* Functions */
64          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
65          /* Structs and interfaces */
66          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
67          /* -- */
68          "[a-zA-Z_][a-zA-Z0-9_]*"
69          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
70          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
71 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
72          "[^<>= \t]+"),
73 PATTERNS("java",
74          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
75          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
76          /* -- */
77          "[a-zA-Z_][a-zA-Z0-9_]*"
78          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
79          "|[-+*/<>%&^|=!]="
80          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
81 PATTERNS("matlab",
82          /*
83           * Octave pattern is mostly the same as matlab, except that '%%%' and
84           * '##' can also be used to begin code sections, in addition to '%%'
85           * that is understood by both.
86           */
87          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
88          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
89 PATTERNS("objc",
90          /* Negate C statements that can look like functions */
91          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
92          /* Objective-C methods */
93          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
94          /* C functions */
95          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
96          /* Objective-C class/protocol definitions */
97          "^(@(implementation|interface|protocol)[ \t].*)$",
98          /* -- */
99          "[a-zA-Z_][a-zA-Z0-9_]*"
100          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
101          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
102 PATTERNS("pascal",
103          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
104                 "implementation|initialization|finalization)[ \t]*.*)$"
105          "\n"
106          "^(.*=[ \t]*(class|record).*)$",
107          /* -- */
108          "[a-zA-Z_][a-zA-Z0-9_]*"
109          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
110          "|<>|<=|>=|:=|\\.\\."),
111 PATTERNS("perl",
112          "^package .*\n"
113          "^sub [[:alnum:]_':]+[ \t]*"
114                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
115                 /*
116                  * Attributes.  A regex can't count nested parentheses,
117                  * so just slurp up whatever we see, taking care not
118                  * to accept lines like "sub foo; # defined elsewhere".
119                  *
120                  * An attribute could contain a semicolon, but at that
121                  * point it seems reasonable enough to give up.
122                  */
123                 "(:[^;#]*)?"
124                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
125                 "(#.*)?$\n" /* comment */
126          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
127                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
128                 "(#.*)?$\n"
129          "^=head[0-9] .*",      /* POD */
130          /* -- */
131          "[[:alpha:]_'][[:alnum:]_']*"
132          "|0[xb]?[0-9a-fA-F_]*"
133          /* taking care not to interpret 3..5 as (3.)(.5) */
134          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
135          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
136          "|&&=|\\|\\|=|//=|\\*\\*="
137          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
138          "|[-+*/%.^&<>=!|]="
139          "|=~|!~"
140          "|<<|<>|<=>|>>"),
141 PATTERNS("php",
142          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
143          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
144          /* -- */
145          "[a-zA-Z_][a-zA-Z0-9_]*"
146          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
147          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
148 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
149          /* -- */
150          "[a-zA-Z_][a-zA-Z0-9_]*"
151          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
152          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
153          /* -- */
154 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
155          /* -- */
156          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
157          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
158          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
159 PATTERNS("rust",
160          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl)[< \t]+[^;]*)$",
161          /* -- */
162          "[a-zA-Z_][a-zA-Z0-9_]*"
163          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
164          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
165 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
166          "[={}\"]|[^={}\" \t]+"),
167 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
168          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
169 PATTERNS("cpp",
170          /* Jump targets or access declarations */
171          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
172          /* functions/methods, variables, and compounds at top level */
173          "^((::[[:space:]]*)?[A-Za-z_].*)$",
174          /* -- */
175          "[a-zA-Z_][a-zA-Z0-9_]*"
176          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
177          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
178 PATTERNS("csharp",
179          /* Keywords */
180          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
181          /* Methods and constructors */
182          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
183          /* Properties */
184          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
185          /* Type definitions */
186          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
187          /* Namespace */
188          "^[ \t]*(namespace[ \t]+.*)$",
189          /* -- */
190          "[a-zA-Z_][a-zA-Z0-9_]*"
191          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
192          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
193 IPATTERN("css",
194          "![:;][[:space:]]*$\n"
195          "^[_a-z0-9].*$",
196          /* -- */
197          /*
198           * This regex comes from W3C CSS specs. Should theoretically also
199           * allow ISO 10646 characters U+00A0 and higher,
200           * but they are not handled in this regex.
201           */
202          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
203          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
204 ),
205 { "default", NULL, -1, { NULL, 0 } },
206 };
207 #undef PATTERNS
208 #undef IPATTERN
209
210 static struct userdiff_driver driver_true = {
211         "diff=true",
212         NULL,
213         0,
214         { NULL, 0 }
215 };
216
217 static struct userdiff_driver driver_false = {
218         "!diff",
219         NULL,
220         1,
221         { NULL, 0 }
222 };
223
224 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
225 {
226         int i;
227         for (i = 0; i < ndrivers; i++) {
228                 struct userdiff_driver *drv = drivers + i;
229                 if (!strncmp(drv->name, k, len) && !drv->name[len])
230                         return drv;
231         }
232         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
233                 struct userdiff_driver *drv = builtin_drivers + i;
234                 if (!strncmp(drv->name, k, len) && !drv->name[len])
235                         return drv;
236         }
237         return NULL;
238 }
239
240 static int parse_funcname(struct userdiff_funcname *f, const char *k,
241                 const char *v, int cflags)
242 {
243         if (git_config_string(&f->pattern, k, v) < 0)
244                 return -1;
245         f->cflags = cflags;
246         return 0;
247 }
248
249 static int parse_tristate(int *b, const char *k, const char *v)
250 {
251         if (v && !strcasecmp(v, "auto"))
252                 *b = -1;
253         else
254                 *b = git_config_bool(k, v);
255         return 0;
256 }
257
258 static int parse_bool(int *b, const char *k, const char *v)
259 {
260         *b = git_config_bool(k, v);
261         return 0;
262 }
263
264 int userdiff_config(const char *k, const char *v)
265 {
266         struct userdiff_driver *drv;
267         const char *name, *type;
268         int namelen;
269
270         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
271                 return 0;
272
273         drv = userdiff_find_by_namelen(name, namelen);
274         if (!drv) {
275                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
276                 drv = &drivers[ndrivers++];
277                 memset(drv, 0, sizeof(*drv));
278                 drv->name = xmemdupz(name, namelen);
279                 drv->binary = -1;
280         }
281
282         if (!strcmp(type, "funcname"))
283                 return parse_funcname(&drv->funcname, k, v, 0);
284         if (!strcmp(type, "xfuncname"))
285                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
286         if (!strcmp(type, "binary"))
287                 return parse_tristate(&drv->binary, k, v);
288         if (!strcmp(type, "command"))
289                 return git_config_string(&drv->external, k, v);
290         if (!strcmp(type, "textconv"))
291                 return git_config_string(&drv->textconv, k, v);
292         if (!strcmp(type, "cachetextconv"))
293                 return parse_bool(&drv->textconv_want_cache, k, v);
294         if (!strcmp(type, "wordregex"))
295                 return git_config_string(&drv->word_regex, k, v);
296
297         return 0;
298 }
299
300 struct userdiff_driver *userdiff_find_by_name(const char *name)
301 {
302         int len = strlen(name);
303         return userdiff_find_by_namelen(name, len);
304 }
305
306 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
307                                               const char *path)
308 {
309         static struct attr_check *check;
310
311         if (!check)
312                 check = attr_check_initl("diff", NULL);
313         if (!path)
314                 return NULL;
315         git_check_attr(istate, path, check);
316
317         if (ATTR_TRUE(check->items[0].value))
318                 return &driver_true;
319         if (ATTR_FALSE(check->items[0].value))
320                 return &driver_false;
321         if (ATTR_UNSET(check->items[0].value))
322                 return NULL;
323         return userdiff_find_by_name(check->items[0].value);
324 }
325
326 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
327                                               struct userdiff_driver *driver)
328 {
329         if (!driver->textconv)
330                 return NULL;
331
332         if (driver->textconv_want_cache && !driver->textconv_cache) {
333                 struct notes_cache *c = xmalloc(sizeof(*c));
334                 struct strbuf name = STRBUF_INIT;
335
336                 strbuf_addf(&name, "textconv/%s", driver->name);
337                 notes_cache_init(r, c, name.buf, driver->textconv);
338                 driver->textconv_cache = c;
339                 strbuf_release(&name);
340         }
341
342         return driver;
343 }