Merge branch 'tr/line-log'
[git/git.git] / line-range.c
CommitLineData
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 */
10static 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(&regexp, spec + 1, REG_NEWLINE)) &&
68 !(reg_error = regexec(&regexp, 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(&regexp);
80 *term++ = '/';
81 return term;
82 }
83 else {
84 char errbuf[1024];
85 regerror(reg_error, &regexp, errbuf, 1024);
86 die("-L parameter '%s': %s", spec + 1, errbuf);
87 }
88}
89
13b8f68c
TR
90static 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
105static 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
138static 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(&regexp, pattern, REG_NEWLINE);
175 if (reg_error) {
176 char errbuf[1024];
177 regerror(reg_error, &regexp, errbuf, 1024);
178 die("-L parameter '%s': %s", pattern, errbuf);
179 }
180
181 p = find_funcname_matching_regexp(xecfg, (char*) start, &regexp);
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(&regexp);
201 free(xecfg);
202 free(pattern);
203
204 /* compensate for 1-based numbering */
205 (*begin)++;
206
207 return term;
208}
209
25ed3412 210int 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{
13b8f68c
TR
214 if (*arg == ':') {
215 arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, begin, end, path);
216 if (!arg || *arg)
217 return -1;
218 return 0;
219 }
220
25ed3412
BY
221 arg = parse_loc(arg, nth_line_cb, cb_data, lines, 1, begin);
222
223 if (*arg == ',')
224 arg = parse_loc(arg + 1, nth_line_cb, cb_data, lines, *begin + 1, end);
225
226 if (*arg)
227 return -1;
228
229 return 0;
230}
12da1d1f
TR
231
232const char *skip_range_arg(const char *arg)
233{
13b8f68c
TR
234 if (*arg == ':')
235 return parse_range_funcname(arg, NULL, NULL, 0, NULL, NULL, NULL);
236
12da1d1f
TR
237 arg = parse_loc(arg, NULL, NULL, 0, -1, NULL);
238
239 if (*arg == ',')
240 arg = parse_loc(arg+1, NULL, NULL, 0, 0, NULL);
241
242 return arg;
243}