Merge branch 'jk/type-from-string-gently' into maint
[git] / userdiff.c
1 #include "cache.h"
2 #include "userdiff.h"
3 #include "attr.h"
4
5 static struct userdiff_driver *drivers;
6 static int ndrivers;
7 static int drivers_alloc;
8
9 #define PATTERNS(name, pattern, word_regex)                     \
10         { name, NULL, -1, { pattern, REG_EXTENDED },            \
11           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
12 #define IPATTERN(name, pattern, word_regex)                     \
13         { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
14           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
15 static struct userdiff_driver builtin_drivers[] = {
16 IPATTERN("ada",
17          "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
18          "!^[ \t]*with[ \t].*$\n"
19          "^[ \t]*((procedure|function)[ \t]+.*)$\n"
20          "^[ \t]*((package|protected|task)[ \t]+.*)$",
21          /* -- */
22          "[a-zA-Z][a-zA-Z0-9_]*"
23          "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
24          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
25 IPATTERN("fortran",
26          "!^([C*]|[ \t]*!)\n"
27          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
28          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
29                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
30          /* -- */
31          "[a-zA-Z][a-zA-Z0-9_]*"
32          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
33          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
34           * Don't worry about format statements without leading digits since
35           * they would have been matched above as a variable anyway. */
36          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
37          "|//|\\*\\*|::|[/<>=]="),
38 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
39          "[^<>= \t]+"),
40 PATTERNS("java",
41          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
42          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
43          /* -- */
44          "[a-zA-Z_][a-zA-Z0-9_]*"
45          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
46          "|[-+*/<>%&^|=!]="
47          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
48 PATTERNS("matlab",
49          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
50          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
51 PATTERNS("objc",
52          /* Negate C statements that can look like functions */
53          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
54          /* Objective-C methods */
55          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
56          /* C functions */
57          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
58          /* Objective-C class/protocol definitions */
59          "^(@(implementation|interface|protocol)[ \t].*)$",
60          /* -- */
61          "[a-zA-Z_][a-zA-Z0-9_]*"
62          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
63          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
64 PATTERNS("pascal",
65          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
66                 "implementation|initialization|finalization)[ \t]*.*)$"
67          "\n"
68          "^(.*=[ \t]*(class|record).*)$",
69          /* -- */
70          "[a-zA-Z_][a-zA-Z0-9_]*"
71          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
72          "|<>|<=|>=|:=|\\.\\."),
73 PATTERNS("perl",
74          "^package .*\n"
75          "^sub [[:alnum:]_':]+[ \t]*"
76                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
77                 /*
78                  * Attributes.  A regex can't count nested parentheses,
79                  * so just slurp up whatever we see, taking care not
80                  * to accept lines like "sub foo; # defined elsewhere".
81                  *
82                  * An attribute could contain a semicolon, but at that
83                  * point it seems reasonable enough to give up.
84                  */
85                 "(:[^;#]*)?"
86                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
87                 "(#.*)?$\n" /* comment */
88          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
89                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
90                 "(#.*)?$\n"
91          "^=head[0-9] .*",      /* POD */
92          /* -- */
93          "[[:alpha:]_'][[:alnum:]_']*"
94          "|0[xb]?[0-9a-fA-F_]*"
95          /* taking care not to interpret 3..5 as (3.)(.5) */
96          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
97          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
98          "|&&=|\\|\\|=|//=|\\*\\*="
99          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
100          "|[-+*/%.^&<>=!|]="
101          "|=~|!~"
102          "|<<|<>|<=>|>>"),
103 PATTERNS("php",
104          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
105          "^[\t ]*(class.*)$",
106          /* -- */
107          "[a-zA-Z_][a-zA-Z0-9_]*"
108          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
109          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
110 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
111          /* -- */
112          "[a-zA-Z_][a-zA-Z0-9_]*"
113          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
114          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
115          /* -- */
116 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
117          /* -- */
118          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
119          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
120          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
121 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
122          "[={}\"]|[^={}\" \t]+"),
123 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
124          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
125 PATTERNS("cpp",
126          /* Jump targets or access declarations */
127          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
128          /* functions/methods, variables, and compounds at top level */
129          "^((::[[:space:]]*)?[A-Za-z_].*)$",
130          /* -- */
131          "[a-zA-Z_][a-zA-Z0-9_]*"
132          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
133          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
134 PATTERNS("csharp",
135          /* Keywords */
136          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
137          /* Methods and constructors */
138          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
139          /* Properties */
140          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
141          /* Type definitions */
142          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
143          /* Namespace */
144          "^[ \t]*(namespace[ \t]+.*)$",
145          /* -- */
146          "[a-zA-Z_][a-zA-Z0-9_]*"
147          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
148          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
149 { "default", NULL, -1, { NULL, 0 } },
150 };
151 #undef PATTERNS
152 #undef IPATTERN
153
154 static struct userdiff_driver driver_true = {
155         "diff=true",
156         NULL,
157         0,
158         { NULL, 0 }
159 };
160
161 static struct userdiff_driver driver_false = {
162         "!diff",
163         NULL,
164         1,
165         { NULL, 0 }
166 };
167
168 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
169 {
170         int i;
171         for (i = 0; i < ndrivers; i++) {
172                 struct userdiff_driver *drv = drivers + i;
173                 if (!strncmp(drv->name, k, len) && !drv->name[len])
174                         return drv;
175         }
176         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
177                 struct userdiff_driver *drv = builtin_drivers + i;
178                 if (!strncmp(drv->name, k, len) && !drv->name[len])
179                         return drv;
180         }
181         return NULL;
182 }
183
184 static int parse_funcname(struct userdiff_funcname *f, const char *k,
185                 const char *v, int cflags)
186 {
187         if (git_config_string(&f->pattern, k, v) < 0)
188                 return -1;
189         f->cflags = cflags;
190         return 0;
191 }
192
193 static int parse_tristate(int *b, const char *k, const char *v)
194 {
195         if (v && !strcasecmp(v, "auto"))
196                 *b = -1;
197         else
198                 *b = git_config_bool(k, v);
199         return 0;
200 }
201
202 static int parse_bool(int *b, const char *k, const char *v)
203 {
204         *b = git_config_bool(k, v);
205         return 0;
206 }
207
208 int userdiff_config(const char *k, const char *v)
209 {
210         struct userdiff_driver *drv;
211         const char *name, *type;
212         int namelen;
213
214         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
215                 return 0;
216
217         drv = userdiff_find_by_namelen(name, namelen);
218         if (!drv) {
219                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
220                 drv = &drivers[ndrivers++];
221                 memset(drv, 0, sizeof(*drv));
222                 drv->name = xmemdupz(name, namelen);
223                 drv->binary = -1;
224         }
225
226         if (!strcmp(type, "funcname"))
227                 return parse_funcname(&drv->funcname, k, v, 0);
228         if (!strcmp(type, "xfuncname"))
229                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
230         if (!strcmp(type, "binary"))
231                 return parse_tristate(&drv->binary, k, v);
232         if (!strcmp(type, "command"))
233                 return git_config_string(&drv->external, k, v);
234         if (!strcmp(type, "textconv"))
235                 return git_config_string(&drv->textconv, k, v);
236         if (!strcmp(type, "cachetextconv"))
237                 return parse_bool(&drv->textconv_want_cache, k, v);
238         if (!strcmp(type, "wordregex"))
239                 return git_config_string(&drv->word_regex, k, v);
240
241         return 0;
242 }
243
244 struct userdiff_driver *userdiff_find_by_name(const char *name) {
245         int len = strlen(name);
246         return userdiff_find_by_namelen(name, len);
247 }
248
249 struct userdiff_driver *userdiff_find_by_path(const char *path)
250 {
251         static struct git_attr *attr;
252         struct git_attr_check check;
253
254         if (!attr)
255                 attr = git_attr("diff");
256         check.attr = attr;
257
258         if (!path)
259                 return NULL;
260         if (git_check_attr(path, 1, &check))
261                 return NULL;
262
263         if (ATTR_TRUE(check.value))
264                 return &driver_true;
265         if (ATTR_FALSE(check.value))
266                 return &driver_false;
267         if (ATTR_UNSET(check.value))
268                 return NULL;
269         return userdiff_find_by_name(check.value);
270 }
271
272 struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
273 {
274         if (!driver->textconv)
275                 return NULL;
276
277         if (driver->textconv_want_cache && !driver->textconv_cache) {
278                 struct notes_cache *c = xmalloc(sizeof(*c));
279                 struct strbuf name = STRBUF_INIT;
280
281                 strbuf_addf(&name, "textconv/%s", driver->name);
282                 notes_cache_init(c, name.buf, driver->textconv);
283                 driver->textconv_cache = c;
284         }
285
286         return driver;
287 }