Merge tag 'v2.24.0-rc1' of github.com:git/git into master
[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 IPATTERN("fortran",
36          "!^([C*]|[ \t]*!)\n"
37          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
38          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
39                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
40          /* -- */
41          "[a-zA-Z][a-zA-Z0-9_]*"
42          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
43          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
44           * Don't worry about format statements without leading digits since
45           * they would have been matched above as a variable anyway. */
46          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
47          "|//|\\*\\*|::|[/<>=]="),
48 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
49          "[^ \t-]+"),
50 PATTERNS("golang",
51          /* Functions */
52          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
53          /* Structs and interfaces */
54          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
55          /* -- */
56          "[a-zA-Z_][a-zA-Z0-9_]*"
57          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
58          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
59 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
60          "[^<>= \t]+"),
61 PATTERNS("java",
62          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
63          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
64          /* -- */
65          "[a-zA-Z_][a-zA-Z0-9_]*"
66          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
67          "|[-+*/<>%&^|=!]="
68          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
69 PATTERNS("matlab",
70          /*
71           * Octave pattern is mostly the same as matlab, except that '%%%' and
72           * '##' can also be used to begin code sections, in addition to '%%'
73           * that is understood by both.
74           */
75          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
76          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
77 PATTERNS("objc",
78          /* Negate C statements that can look like functions */
79          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
80          /* Objective-C methods */
81          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
82          /* C functions */
83          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
84          /* Objective-C class/protocol definitions */
85          "^(@(implementation|interface|protocol)[ \t].*)$",
86          /* -- */
87          "[a-zA-Z_][a-zA-Z0-9_]*"
88          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
89          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
90 PATTERNS("pascal",
91          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
92                 "implementation|initialization|finalization)[ \t]*.*)$"
93          "\n"
94          "^(.*=[ \t]*(class|record).*)$",
95          /* -- */
96          "[a-zA-Z_][a-zA-Z0-9_]*"
97          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
98          "|<>|<=|>=|:=|\\.\\."),
99 PATTERNS("perl",
100          "^package .*\n"
101          "^sub [[:alnum:]_':]+[ \t]*"
102                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
103                 /*
104                  * Attributes.  A regex can't count nested parentheses,
105                  * so just slurp up whatever we see, taking care not
106                  * to accept lines like "sub foo; # defined elsewhere".
107                  *
108                  * An attribute could contain a semicolon, but at that
109                  * point it seems reasonable enough to give up.
110                  */
111                 "(:[^;#]*)?"
112                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
113                 "(#.*)?$\n" /* comment */
114          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
115                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
116                 "(#.*)?$\n"
117          "^=head[0-9] .*",      /* POD */
118          /* -- */
119          "[[:alpha:]_'][[:alnum:]_']*"
120          "|0[xb]?[0-9a-fA-F_]*"
121          /* taking care not to interpret 3..5 as (3.)(.5) */
122          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
123          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
124          "|&&=|\\|\\|=|//=|\\*\\*="
125          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
126          "|[-+*/%.^&<>=!|]="
127          "|=~|!~"
128          "|<<|<>|<=>|>>"),
129 PATTERNS("php",
130          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
131          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
132          /* -- */
133          "[a-zA-Z_][a-zA-Z0-9_]*"
134          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
135          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
136 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
137          /* -- */
138          "[a-zA-Z_][a-zA-Z0-9_]*"
139          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
140          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
141          /* -- */
142 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
143          /* -- */
144          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
145          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
146          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
147 PATTERNS("rust",
148          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl)[< \t]+[^;]*)$",
149          /* -- */
150          "[a-zA-Z_][a-zA-Z0-9_]*"
151          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
152          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
153 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
154          "[={}\"]|[^={}\" \t]+"),
155 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
156          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
157 PATTERNS("cpp",
158          /* Jump targets or access declarations */
159          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
160          /* functions/methods, variables, and compounds at top level */
161          "^((::[[:space:]]*)?[A-Za-z_].*)$",
162          /* -- */
163          "[a-zA-Z_][a-zA-Z0-9_]*"
164          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
165          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
166 PATTERNS("csharp",
167          /* Keywords */
168          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
169          /* Methods and constructors */
170          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
171          /* Properties */
172          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
173          /* Type definitions */
174          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
175          /* Namespace */
176          "^[ \t]*(namespace[ \t]+.*)$",
177          /* -- */
178          "[a-zA-Z_][a-zA-Z0-9_]*"
179          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
180          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
181 IPATTERN("css",
182          "![:;][[:space:]]*$\n"
183          "^[_a-z0-9].*$",
184          /* -- */
185          /*
186           * This regex comes from W3C CSS specs. Should theoretically also
187           * allow ISO 10646 characters U+00A0 and higher,
188           * but they are not handled in this regex.
189           */
190          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
191          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
192 ),
193 { "default", NULL, -1, { NULL, 0 } },
194 };
195 #undef PATTERNS
196 #undef IPATTERN
197
198 static struct userdiff_driver driver_true = {
199         "diff=true",
200         NULL,
201         0,
202         { NULL, 0 }
203 };
204
205 static struct userdiff_driver driver_false = {
206         "!diff",
207         NULL,
208         1,
209         { NULL, 0 }
210 };
211
212 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
213 {
214         int i;
215         for (i = 0; i < ndrivers; i++) {
216                 struct userdiff_driver *drv = drivers + i;
217                 if (!strncmp(drv->name, k, len) && !drv->name[len])
218                         return drv;
219         }
220         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
221                 struct userdiff_driver *drv = builtin_drivers + i;
222                 if (!strncmp(drv->name, k, len) && !drv->name[len])
223                         return drv;
224         }
225         return NULL;
226 }
227
228 static int parse_funcname(struct userdiff_funcname *f, const char *k,
229                 const char *v, int cflags)
230 {
231         if (git_config_string(&f->pattern, k, v) < 0)
232                 return -1;
233         f->cflags = cflags;
234         return 0;
235 }
236
237 static int parse_tristate(int *b, const char *k, const char *v)
238 {
239         if (v && !strcasecmp(v, "auto"))
240                 *b = -1;
241         else
242                 *b = git_config_bool(k, v);
243         return 0;
244 }
245
246 static int parse_bool(int *b, const char *k, const char *v)
247 {
248         *b = git_config_bool(k, v);
249         return 0;
250 }
251
252 int userdiff_config(const char *k, const char *v)
253 {
254         struct userdiff_driver *drv;
255         const char *name, *type;
256         int namelen;
257
258         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
259                 return 0;
260
261         drv = userdiff_find_by_namelen(name, namelen);
262         if (!drv) {
263                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
264                 drv = &drivers[ndrivers++];
265                 memset(drv, 0, sizeof(*drv));
266                 drv->name = xmemdupz(name, namelen);
267                 drv->binary = -1;
268         }
269
270         if (!strcmp(type, "funcname"))
271                 return parse_funcname(&drv->funcname, k, v, 0);
272         if (!strcmp(type, "xfuncname"))
273                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
274         if (!strcmp(type, "binary"))
275                 return parse_tristate(&drv->binary, k, v);
276         if (!strcmp(type, "command"))
277                 return git_config_string(&drv->external, k, v);
278         if (!strcmp(type, "textconv"))
279                 return git_config_string(&drv->textconv, k, v);
280         if (!strcmp(type, "cachetextconv"))
281                 return parse_bool(&drv->textconv_want_cache, k, v);
282         if (!strcmp(type, "wordregex"))
283                 return git_config_string(&drv->word_regex, k, v);
284
285         return 0;
286 }
287
288 struct userdiff_driver *userdiff_find_by_name(const char *name)
289 {
290         int len = strlen(name);
291         return userdiff_find_by_namelen(name, len);
292 }
293
294 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
295                                               const char *path)
296 {
297         static struct attr_check *check;
298
299         if (!check)
300                 check = attr_check_initl("diff", NULL);
301         if (!path)
302                 return NULL;
303         git_check_attr(istate, path, check);
304
305         if (ATTR_TRUE(check->items[0].value))
306                 return &driver_true;
307         if (ATTR_FALSE(check->items[0].value))
308                 return &driver_false;
309         if (ATTR_UNSET(check->items[0].value))
310                 return NULL;
311         return userdiff_find_by_name(check->items[0].value);
312 }
313
314 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
315                                               struct userdiff_driver *driver)
316 {
317         if (!driver->textconv)
318                 return NULL;
319
320         if (driver->textconv_want_cache && !driver->textconv_cache) {
321                 struct notes_cache *c = xmalloc(sizeof(*c));
322                 struct strbuf name = STRBUF_INIT;
323
324                 strbuf_addf(&name, "textconv/%s", driver->name);
325                 notes_cache_init(r, c, name.buf, driver->textconv);
326                 driver->textconv_cache = c;
327                 strbuf_release(&name);
328         }
329
330         return driver;
331 }