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 /*
62 * Octave pattern is mostly the same as matlab, except that '%%%' and
63 * '##' can also be used to begin code sections, in addition to '%%'
64 * that is understood by both.
65 */
66 "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
67 "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
68PATTERNS("objc",
69 /* Negate C statements that can look like functions */
70 "!^[ \t]*(do|for|if|else|return|switch|while)\n"
71 /* Objective-C methods */
72 "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
73 /* C functions */
74 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
75 /* Objective-C class/protocol definitions */
76 "^(@(implementation|interface|protocol)[ \t].*)$",
77 /* -- */
78 "[a-zA-Z_][a-zA-Z0-9_]*"
79 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
80 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
81PATTERNS("pascal",
82 "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
83 "implementation|initialization|finalization)[ \t]*.*)$"
84 "\n"
85 "^(.*=[ \t]*(class|record).*)$",
86 /* -- */
87 "[a-zA-Z_][a-zA-Z0-9_]*"
88 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
89 "|<>|<=|>=|:=|\\.\\."),
90PATTERNS("perl",
91 "^package .*\n"
92 "^sub [[:alnum:]_':]+[ \t]*"
93 "(\\([^)]*\\)[ \t]*)?" /* prototype */
94 /*
95 * Attributes. A regex can't count nested parentheses,
96 * so just slurp up whatever we see, taking care not
97 * to accept lines like "sub foo; # defined elsewhere".
98 *
99 * An attribute could contain a semicolon, but at that
100 * point it seems reasonable enough to give up.
101 */
102 "(:[^;#]*)?"
103 "(\\{[ \t]*)?" /* brace can come here or on the next line */
104 "(#.*)?$\n" /* comment */
105 "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
106 "(\\{[ \t]*)?" /* brace can come here or on the next line */
107 "(#.*)?$\n"
108 "^=head[0-9] .*", /* POD */
109 /* -- */
110 "[[:alpha:]_'][[:alnum:]_']*"
111 "|0[xb]?[0-9a-fA-F_]*"
112 /* taking care not to interpret 3..5 as (3.)(.5) */
113 "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
114 "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
115 "|&&=|\\|\\|=|//=|\\*\\*="
116 "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
117 "|[-+*/%.^&<>=!|]="
118 "|=~|!~"
119 "|<<|<>|<=>|>>"),
120PATTERNS("php",
121 "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
122 "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
123 /* -- */
124 "[a-zA-Z_][a-zA-Z0-9_]*"
125 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
126 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
127PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
128 /* -- */
129 "[a-zA-Z_][a-zA-Z0-9_]*"
130 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
131 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
132 /* -- */
133PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
134 /* -- */
135 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
136 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
137 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
138PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
139 "[={}\"]|[^={}\" \t]+"),
140PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
141 "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
142PATTERNS("cpp",
143 /* Jump targets or access declarations */
144 "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
145 /* functions/methods, variables, and compounds at top level */
146 "^((::[[:space:]]*)?[A-Za-z_].*)$",
147 /* -- */
148 "[a-zA-Z_][a-zA-Z0-9_]*"
149 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
150 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
151PATTERNS("csharp",
152 /* Keywords */
153 "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
154 /* Methods and constructors */
155 "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
156 /* Properties */
157 "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
158 /* Type definitions */
159 "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
160 /* Namespace */
161 "^[ \t]*(namespace[ \t]+.*)$",
162 /* -- */
163 "[a-zA-Z_][a-zA-Z0-9_]*"
164 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
165 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
166IPATTERN("css",
167 "![:;][[:space:]]*$\n"
168 "^[_a-z0-9].*$",
169 /* -- */
170 /*
171 * This regex comes from W3C CSS specs. Should theoretically also
172 * allow ISO 10646 characters U+00A0 and higher,
173 * but they are not handled in this regex.
174 */
175 "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
176 "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
177),
178{ "default", NULL, -1, { NULL, 0 } },
179};
180#undef PATTERNS
181#undef IPATTERN
182
183static struct userdiff_driver driver_true = {
184 "diff=true",
185 NULL,
186 0,
187 { NULL, 0 }
188};
189
190static struct userdiff_driver driver_false = {
191 "!diff",
192 NULL,
193 1,
194 { NULL, 0 }
195};
196
197static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
198{
199 int i;
200 for (i = 0; i < ndrivers; i++) {
201 struct userdiff_driver *drv = drivers + i;
202 if (!strncmp(drv->name, k, len) && !drv->name[len])
203 return drv;
204 }
205 for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
206 struct userdiff_driver *drv = builtin_drivers + i;
207 if (!strncmp(drv->name, k, len) && !drv->name[len])
208 return drv;
209 }
210 return NULL;
211}
212
213static int parse_funcname(struct userdiff_funcname *f, const char *k,
214 const char *v, int cflags)
215{
216 if (git_config_string(&f->pattern, k, v) < 0)
217 return -1;
218 f->cflags = cflags;
219 return 0;
220}
221
222static int parse_tristate(int *b, const char *k, const char *v)
223{
224 if (v && !strcasecmp(v, "auto"))
225 *b = -1;
226 else
227 *b = git_config_bool(k, v);
228 return 0;
229}
230
231static int parse_bool(int *b, const char *k, const char *v)
232{
233 *b = git_config_bool(k, v);
234 return 0;
235}
236
237int userdiff_config(const char *k, const char *v)
238{
239 struct userdiff_driver *drv;
240 const char *name, *type;
241 int namelen;
242
243 if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
244 return 0;
245
246 drv = userdiff_find_by_namelen(name, namelen);
247 if (!drv) {
248 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
249 drv = &drivers[ndrivers++];
250 memset(drv, 0, sizeof(*drv));
251 drv->name = xmemdupz(name, namelen);
252 drv->binary = -1;
253 }
254
255 if (!strcmp(type, "funcname"))
256 return parse_funcname(&drv->funcname, k, v, 0);
257 if (!strcmp(type, "xfuncname"))
258 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
259 if (!strcmp(type, "binary"))
260 return parse_tristate(&drv->binary, k, v);
261 if (!strcmp(type, "command"))
262 return git_config_string(&drv->external, k, v);
263 if (!strcmp(type, "textconv"))
264 return git_config_string(&drv->textconv, k, v);
265 if (!strcmp(type, "cachetextconv"))
266 return parse_bool(&drv->textconv_want_cache, k, v);
267 if (!strcmp(type, "wordregex"))
268 return git_config_string(&drv->word_regex, k, v);
269
270 return 0;
271}
272
273struct userdiff_driver *userdiff_find_by_name(const char *name)
274{
275 int len = strlen(name);
276 return userdiff_find_by_namelen(name, len);
277}
278
279struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
280 const char *path)
281{
282 static struct attr_check *check;
283
284 if (!check)
285 check = attr_check_initl("diff", NULL);
286 if (!path)
287 return NULL;
288 git_check_attr(istate, path, check);
289
290 if (ATTR_TRUE(check->items[0].value))
291 return &driver_true;
292 if (ATTR_FALSE(check->items[0].value))
293 return &driver_false;
294 if (ATTR_UNSET(check->items[0].value))
295 return NULL;
296 return userdiff_find_by_name(check->items[0].value);
297}
298
299struct userdiff_driver *userdiff_get_textconv(struct repository *r,
300 struct userdiff_driver *driver)
301{
302 if (!driver->textconv)
303 return NULL;
304
305 if (driver->textconv_want_cache && !driver->textconv_cache) {
306 struct notes_cache *c = xmalloc(sizeof(*c));
307 struct strbuf name = STRBUF_INIT;
308
309 strbuf_addf(&name, "textconv/%s", driver->name);
310 notes_cache_init(r, c, name.buf, driver->textconv);
311 driver->textconv_cache = c;
312 strbuf_release(&name);
313 }
314
315 return driver;
316}