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