merge(third_party/git): Merge squashed git subtree at v2.23.0
Merge commit '1b593e1ea4' as 'third_party/git'
This commit is contained in:
Vincent Ambo
commit
7ef0d62730
3629 changed files with 1139935 additions and 0 deletions
295
third_party/git/line-range.c
vendored
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295
third_party/git/line-range.c
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#include "git-compat-util.h"
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#include "line-range.h"
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#include "xdiff-interface.h"
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#include "strbuf.h"
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#include "userdiff.h"
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/*
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* Parse one item in the -L option
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*
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* 'begin' is applicable only to relative range anchors. Absolute anchors
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* ignore this value.
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*
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* When parsing "-L A,B", parse_loc() is called once for A and once for B.
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*
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* When parsing A, 'begin' must be a negative number, the absolute value of
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* which is the line at which relative start-of-range anchors should be
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* based. Beginning of file is represented by -1.
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*
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* When parsing B, 'begin' must be the positive line number immediately
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* following the line computed for 'A'.
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*/
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static const char *parse_loc(const char *spec, nth_line_fn_t nth_line,
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void *data, long lines, long begin, long *ret)
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{
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char *term;
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const char *line;
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long num;
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int reg_error;
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regex_t regexp;
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regmatch_t match[1];
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/* Allow "-L <something>,+20" to mean starting at <something>
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* for 20 lines, or "-L <something>,-5" for 5 lines ending at
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* <something>.
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*/
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if (1 <= begin && (spec[0] == '+' || spec[0] == '-')) {
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num = strtol(spec + 1, &term, 10);
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if (term != spec + 1) {
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if (!ret)
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return term;
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if (num == 0)
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die("-L invalid empty range");
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if (spec[0] == '-')
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num = 0 - num;
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if (0 < num)
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*ret = begin + num - 2;
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else if (!num)
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*ret = begin;
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else
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*ret = begin + num > 0 ? begin + num : 1;
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return term;
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}
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return spec;
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}
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num = strtol(spec, &term, 10);
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if (term != spec) {
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if (ret) {
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if (num <= 0)
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die("-L invalid line number: %ld", num);
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*ret = num;
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}
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return term;
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}
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if (begin < 0) {
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if (spec[0] != '^')
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begin = -begin;
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else {
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begin = 1;
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spec++;
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}
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}
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if (spec[0] != '/')
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return spec;
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/* it could be a regexp of form /.../ */
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for (term = (char *) spec + 1; *term && *term != '/'; term++) {
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if (*term == '\\')
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term++;
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}
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if (*term != '/')
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return spec;
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/* in the scan-only case we are not interested in the regex */
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if (!ret)
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return term+1;
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/* try [spec+1 .. term-1] as regexp */
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*term = 0;
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begin--; /* input is in human terms */
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line = nth_line(data, begin);
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if (!(reg_error = regcomp(®exp, spec + 1, REG_NEWLINE)) &&
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!(reg_error = regexec(®exp, line, 1, match, 0))) {
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const char *cp = line + match[0].rm_so;
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const char *nline;
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while (begin++ < lines) {
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nline = nth_line(data, begin);
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if (line <= cp && cp < nline)
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break;
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line = nline;
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}
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*ret = begin;
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regfree(®exp);
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*term++ = '/';
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return term;
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}
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else {
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char errbuf[1024];
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regerror(reg_error, ®exp, errbuf, 1024);
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die("-L parameter '%s' starting at line %ld: %s",
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spec + 1, begin + 1, errbuf);
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}
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}
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static int match_funcname(xdemitconf_t *xecfg, const char *bol, const char *eol)
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{
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if (xecfg) {
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char buf[1];
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return xecfg->find_func(bol, eol - bol, buf, 1,
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xecfg->find_func_priv) >= 0;
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}
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if (bol == eol)
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return 0;
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if (isalpha(*bol) || *bol == '_' || *bol == '$')
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return 1;
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return 0;
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}
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static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char *start,
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regex_t *regexp)
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{
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int reg_error;
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regmatch_t match[1];
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while (1) {
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const char *bol, *eol;
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reg_error = regexec(regexp, start, 1, match, 0);
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if (reg_error == REG_NOMATCH)
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return NULL;
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else if (reg_error) {
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char errbuf[1024];
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regerror(reg_error, regexp, errbuf, 1024);
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die("-L parameter: regexec() failed: %s", errbuf);
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}
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/* determine extent of line matched */
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bol = start+match[0].rm_so;
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eol = start+match[0].rm_eo;
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while (bol > start && *bol != '\n')
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bol--;
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if (*bol == '\n')
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bol++;
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while (*eol && *eol != '\n')
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eol++;
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if (*eol == '\n')
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eol++;
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/* is it a funcname line? */
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if (match_funcname(xecfg, (char*) bol, (char*) eol))
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return bol;
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start = eol;
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}
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}
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static const char *parse_range_funcname(
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const char *arg, nth_line_fn_t nth_line_cb,
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void *cb_data, long lines, long anchor, long *begin, long *end,
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const char *path, struct index_state *istate)
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{
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char *pattern;
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const char *term;
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struct userdiff_driver *drv;
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xdemitconf_t *xecfg = NULL;
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const char *start;
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const char *p;
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int reg_error;
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regex_t regexp;
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if (*arg == '^') {
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anchor = 1;
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arg++;
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}
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assert(*arg == ':');
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term = arg+1;
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while (*term && *term != ':') {
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if (*term == '\\' && *(term+1))
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term++;
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term++;
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}
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if (term == arg+1)
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return NULL;
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if (!begin) /* skip_range_arg case */
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return term;
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pattern = xstrndup(arg+1, term-(arg+1));
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anchor--; /* input is in human terms */
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start = nth_line_cb(cb_data, anchor);
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drv = userdiff_find_by_path(istate, path);
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if (drv && drv->funcname.pattern) {
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const struct userdiff_funcname *pe = &drv->funcname;
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xecfg = xcalloc(1, sizeof(*xecfg));
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xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
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}
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reg_error = regcomp(®exp, pattern, REG_NEWLINE);
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if (reg_error) {
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char errbuf[1024];
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regerror(reg_error, ®exp, errbuf, 1024);
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die("-L parameter '%s': %s", pattern, errbuf);
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}
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p = find_funcname_matching_regexp(xecfg, (char*) start, ®exp);
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if (!p)
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die("-L parameter '%s' starting at line %ld: no match",
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pattern, anchor + 1);
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*begin = 0;
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while (p > nth_line_cb(cb_data, *begin))
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(*begin)++;
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if (*begin >= lines)
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die("-L parameter '%s' matches at EOF", pattern);
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*end = *begin+1;
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while (*end < lines) {
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const char *bol = nth_line_cb(cb_data, *end);
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const char *eol = nth_line_cb(cb_data, *end+1);
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if (match_funcname(xecfg, bol, eol))
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break;
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(*end)++;
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}
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regfree(®exp);
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free(xecfg);
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free(pattern);
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/* compensate for 1-based numbering */
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(*begin)++;
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return term;
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}
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int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
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void *cb_data, long lines, long anchor,
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long *begin, long *end,
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const char *path, struct index_state *istate)
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{
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*begin = *end = 0;
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if (anchor < 1)
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anchor = 1;
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if (anchor > lines)
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anchor = lines + 1;
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if (*arg == ':' || (*arg == '^' && *(arg + 1) == ':')) {
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arg = parse_range_funcname(arg, nth_line_cb, cb_data,
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lines, anchor, begin, end,
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path, istate);
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if (!arg || *arg)
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return -1;
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return 0;
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}
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arg = parse_loc(arg, nth_line_cb, cb_data, lines, -anchor, begin);
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if (*arg == ',')
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arg = parse_loc(arg + 1, nth_line_cb, cb_data, lines, *begin + 1, end);
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if (*arg)
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return -1;
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if (*begin && *end && *end < *begin) {
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SWAP(*end, *begin);
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}
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return 0;
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}
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const char *skip_range_arg(const char *arg, struct index_state *istate)
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{
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if (*arg == ':' || (*arg == '^' && *(arg + 1) == ':'))
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return parse_range_funcname(arg, NULL, NULL,
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0, 0, NULL, NULL,
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NULL, istate);
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arg = parse_loc(arg, NULL, NULL, 0, -1, NULL);
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if (*arg == ',')
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arg = parse_loc(arg+1, NULL, NULL, 0, 0, NULL);
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return arg;
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}
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