diff options
Diffstat (limited to 'src/libutil/regex.cc')
| -rw-r--r-- | src/libutil/regex.cc | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/src/libutil/regex.cc b/src/libutil/regex.cc index 36c8458ce..84274b3e1 100644 --- a/src/libutil/regex.cc +++ b/src/libutil/regex.cc @@ -1,13 +1,16 @@ #include "regex.hh" #include "types.hh" +#include <algorithm> + namespace nix { -Regex::Regex(const string & pattern) +Regex::Regex(const string & pattern, bool subs) { /* Patterns must match the entire string. */ - int err = regcomp(&preg, ("^(" + pattern + ")$").c_str(), REG_NOSUB | REG_EXTENDED); - if (err) throw Error(format("compiling pattern ‘%1%’: %2%") % pattern % showError(err)); + int err = regcomp(&preg, ("^(" + pattern + ")$").c_str(), (subs ? 0 : REG_NOSUB) | REG_EXTENDED); + if (err) throw RegexError(format("compiling pattern ‘%1%’: %2%") % pattern % showError(err)); + nrParens = subs ? std::count(pattern.begin(), pattern.end(), '(') : 0; } Regex::~Regex() @@ -23,6 +26,20 @@ bool Regex::matches(const string & s) throw Error(format("matching string ‘%1%’: %2%") % s % showError(err)); } +bool Regex::matches(const string & s, Subs & subs) +{ + regmatch_t pmatch[nrParens + 2]; + int err = regexec(&preg, s.c_str(), nrParens + 2, pmatch, 0); + if (err == 0) { + for (unsigned int n = 2; n < nrParens + 2; ++n) + if (pmatch[n].rm_eo != -1) + subs[n - 2] = string(s, pmatch[n].rm_so, pmatch[n].rm_eo - pmatch[n].rm_so); + return true; + } + else if (err == REG_NOMATCH) return false; + throw Error(format("matching string ‘%1%’: %2%") % s % showError(err)); +} + string Regex::showError(int err) { char buf[256]; |