]>
Commit | Line | Data |
---|---|---|
25ed3412 BY |
1 | #include "git-compat-util.h" |
2 | #include "line-range.h" | |
13b8f68c TR |
3 | #include "xdiff-interface.h" |
4 | #include "strbuf.h" | |
5 | #include "userdiff.h" | |
25ed3412 BY |
6 | |
7 | /* | |
8 | * Parse one item in the -L option | |
9 | */ | |
10 | static const char *parse_loc(const char *spec, nth_line_fn_t nth_line, | |
11 | void *data, long lines, long begin, long *ret) | |
12 | { | |
13 | char *term; | |
14 | const char *line; | |
15 | long num; | |
16 | int reg_error; | |
17 | regex_t regexp; | |
18 | regmatch_t match[1]; | |
19 | ||
20 | /* Allow "-L <something>,+20" to mean starting at <something> | |
21 | * for 20 lines, or "-L <something>,-5" for 5 lines ending at | |
22 | * <something>. | |
23 | */ | |
24 | if (1 < begin && (spec[0] == '+' || spec[0] == '-')) { | |
25 | num = strtol(spec + 1, &term, 10); | |
26 | if (term != spec + 1) { | |
12da1d1f TR |
27 | if (!ret) |
28 | return term; | |
25ed3412 BY |
29 | if (spec[0] == '-') |
30 | num = 0 - num; | |
31 | if (0 < num) | |
32 | *ret = begin + num - 2; | |
33 | else if (!num) | |
34 | *ret = begin; | |
35 | else | |
36 | *ret = begin + num; | |
37 | return term; | |
38 | } | |
39 | return spec; | |
40 | } | |
41 | num = strtol(spec, &term, 10); | |
42 | if (term != spec) { | |
12da1d1f TR |
43 | if (ret) |
44 | *ret = num; | |
25ed3412 BY |
45 | return term; |
46 | } | |
47 | if (spec[0] != '/') | |
48 | return spec; | |
49 | ||
50 | /* it could be a regexp of form /.../ */ | |
51 | for (term = (char *) spec + 1; *term && *term != '/'; term++) { | |
52 | if (*term == '\\') | |
53 | term++; | |
54 | } | |
55 | if (*term != '/') | |
56 | return spec; | |
57 | ||
12da1d1f TR |
58 | /* in the scan-only case we are not interested in the regex */ |
59 | if (!ret) | |
60 | return term+1; | |
61 | ||
25ed3412 BY |
62 | /* try [spec+1 .. term-1] as regexp */ |
63 | *term = 0; | |
64 | begin--; /* input is in human terms */ | |
65 | line = nth_line(data, begin); | |
66 | ||
67 | if (!(reg_error = regcomp(®exp, spec + 1, REG_NEWLINE)) && | |
68 | !(reg_error = regexec(®exp, line, 1, match, 0))) { | |
69 | const char *cp = line + match[0].rm_so; | |
70 | const char *nline; | |
71 | ||
72 | while (begin++ < lines) { | |
73 | nline = nth_line(data, begin); | |
74 | if (line <= cp && cp < nline) | |
75 | break; | |
76 | line = nline; | |
77 | } | |
78 | *ret = begin; | |
79 | regfree(®exp); | |
80 | *term++ = '/'; | |
81 | return term; | |
82 | } | |
83 | else { | |
84 | char errbuf[1024]; | |
85 | regerror(reg_error, ®exp, errbuf, 1024); | |
86 | die("-L parameter '%s': %s", spec + 1, errbuf); | |
87 | } | |
88 | } | |
89 | ||
13b8f68c TR |
90 | static int match_funcname(xdemitconf_t *xecfg, const char *bol, const char *eol) |
91 | { | |
92 | if (xecfg) { | |
93 | char buf[1]; | |
94 | return xecfg->find_func(bol, eol - bol, buf, 1, | |
95 | xecfg->find_func_priv) >= 0; | |
96 | } | |
97 | ||
98 | if (bol == eol) | |
99 | return 0; | |
100 | if (isalpha(*bol) || *bol == '_' || *bol == '$') | |
101 | return 1; | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char *start, | |
106 | regex_t *regexp) | |
107 | { | |
108 | int reg_error; | |
109 | regmatch_t match[1]; | |
110 | while (1) { | |
111 | const char *bol, *eol; | |
112 | reg_error = regexec(regexp, start, 1, match, 0); | |
113 | if (reg_error == REG_NOMATCH) | |
114 | return NULL; | |
115 | else if (reg_error) { | |
116 | char errbuf[1024]; | |
117 | regerror(reg_error, regexp, errbuf, 1024); | |
118 | die("-L parameter: regexec() failed: %s", errbuf); | |
119 | } | |
120 | /* determine extent of line matched */ | |
121 | bol = start+match[0].rm_so; | |
122 | eol = start+match[0].rm_eo; | |
123 | while (bol > start && *bol != '\n') | |
124 | bol--; | |
125 | if (*bol == '\n') | |
126 | bol++; | |
127 | while (*eol && *eol != '\n') | |
128 | eol++; | |
129 | if (*eol == '\n') | |
130 | eol++; | |
131 | /* is it a funcname line? */ | |
132 | if (match_funcname(xecfg, (char*) bol, (char*) eol)) | |
133 | return bol; | |
134 | start = eol; | |
135 | } | |
136 | } | |
137 | ||
138 | static const char *parse_range_funcname(const char *arg, nth_line_fn_t nth_line_cb, | |
139 | void *cb_data, long lines, long *begin, long *end, | |
140 | const char *path) | |
141 | { | |
142 | char *pattern; | |
143 | const char *term; | |
144 | struct userdiff_driver *drv; | |
145 | xdemitconf_t *xecfg = NULL; | |
146 | const char *start; | |
147 | const char *p; | |
148 | int reg_error; | |
149 | regex_t regexp; | |
150 | ||
151 | assert(*arg == ':'); | |
152 | term = arg+1; | |
153 | while (*term && *term != ':') { | |
154 | if (*term == '\\' && *(term+1)) | |
155 | term++; | |
156 | term++; | |
157 | } | |
158 | if (term == arg+1) | |
159 | return NULL; | |
160 | if (!begin) /* skip_range_arg case */ | |
161 | return term; | |
162 | ||
163 | pattern = xstrndup(arg+1, term-(arg+1)); | |
164 | ||
165 | start = nth_line_cb(cb_data, 0); | |
166 | ||
167 | drv = userdiff_find_by_path(path); | |
168 | if (drv && drv->funcname.pattern) { | |
169 | const struct userdiff_funcname *pe = &drv->funcname; | |
170 | xecfg = xcalloc(1, sizeof(*xecfg)); | |
171 | xdiff_set_find_func(xecfg, pe->pattern, pe->cflags); | |
172 | } | |
173 | ||
174 | reg_error = regcomp(®exp, pattern, REG_NEWLINE); | |
175 | if (reg_error) { | |
176 | char errbuf[1024]; | |
177 | regerror(reg_error, ®exp, errbuf, 1024); | |
178 | die("-L parameter '%s': %s", pattern, errbuf); | |
179 | } | |
180 | ||
181 | p = find_funcname_matching_regexp(xecfg, (char*) start, ®exp); | |
182 | if (!p) | |
183 | die("-L parameter '%s': no match", pattern); | |
184 | *begin = 0; | |
185 | while (p > nth_line_cb(cb_data, *begin)) | |
186 | (*begin)++; | |
187 | ||
188 | if (*begin >= lines) | |
189 | die("-L parameter '%s' matches at EOF", pattern); | |
190 | ||
191 | *end = *begin+1; | |
192 | while (*end < lines) { | |
193 | const char *bol = nth_line_cb(cb_data, *end); | |
194 | const char *eol = nth_line_cb(cb_data, *end+1); | |
195 | if (match_funcname(xecfg, bol, eol)) | |
196 | break; | |
197 | (*end)++; | |
198 | } | |
199 | ||
200 | regfree(®exp); | |
201 | free(xecfg); | |
202 | free(pattern); | |
203 | ||
204 | /* compensate for 1-based numbering */ | |
205 | (*begin)++; | |
206 | ||
207 | return term; | |
208 | } | |
209 | ||
25ed3412 | 210 | int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb, |
13b8f68c TR |
211 | void *cb_data, long lines, long *begin, long *end, |
212 | const char *path) | |
25ed3412 | 213 | { |
3bf65f9e ES |
214 | *begin = *end = 0; |
215 | ||
13b8f68c TR |
216 | if (*arg == ':') { |
217 | arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, begin, end, path); | |
218 | if (!arg || *arg) | |
219 | return -1; | |
220 | return 0; | |
221 | } | |
222 | ||
25ed3412 BY |
223 | arg = parse_loc(arg, nth_line_cb, cb_data, lines, 1, begin); |
224 | ||
225 | if (*arg == ',') | |
226 | arg = parse_loc(arg + 1, nth_line_cb, cb_data, lines, *begin + 1, end); | |
227 | ||
228 | if (*arg) | |
229 | return -1; | |
230 | ||
3bf65f9e ES |
231 | if (*begin && *end && *end < *begin) { |
232 | long tmp; | |
233 | tmp = *end; *end = *begin; *begin = tmp; | |
234 | } | |
235 | ||
25ed3412 BY |
236 | return 0; |
237 | } | |
12da1d1f TR |
238 | |
239 | const char *skip_range_arg(const char *arg) | |
240 | { | |
13b8f68c TR |
241 | if (*arg == ':') |
242 | return parse_range_funcname(arg, NULL, NULL, 0, NULL, NULL, NULL); | |
243 | ||
12da1d1f TR |
244 | arg = parse_loc(arg, NULL, NULL, 0, -1, NULL); |
245 | ||
246 | if (*arg == ',') | |
247 | arg = parse_loc(arg+1, NULL, NULL, 0, 0, NULL); | |
248 | ||
249 | return arg; | |
250 | } |