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/* matcher.cpp
*
* Copyright (c) 1999-2008 Daniel Burrows
* Copyright (c) 2009-2016 Daniel Nicoletti <dantti12@gmail.com>
* 2012 Matthias Klumpp <matthias@tenstral.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "matcher.h"
#include <stdio.h>
#include <iostream>
Matcher::Matcher(const string &matchers) :
m_hasError(false)
{
string::const_iterator start = matchers.begin();
parse_pattern(start, matchers.end());
if (m_hasError) {
cerr << "ERROR: " << m_error << endl;
}
}
Matcher::~Matcher()
{
for (regex_t &rx : m_matches) {
regfree(&rx);
}
}
bool do_compile(const string &_pattern,
regex_t &pattern,
int cflags)
{
return !regcomp(&pattern, _pattern.c_str(), cflags);
}
bool string_matches(const char *s, regex_t &pattern_nogroup)
{
return !regexec(&pattern_nogroup, s, 0, NULL, 0);
}
bool Matcher::matches(const string &s)
{
int matchesCount = 0;
for (regex_t &rx : m_matches) {
if (string_matches(s.c_str(), rx)) {
matchesCount++;
}
}
return m_matches.size() == matchesCount;
}
bool Matcher::parse_pattern(string::const_iterator &start,
const std::string::const_iterator &end)
{
// Just filter blank strings out immediately.
while (start != end && isspace(*start)) {
++start;
}
if (start == end) {
return false;
}
while (start != end && *start != '|' && *start != ')') {
string subString = parse_substr(start, end);
if (subString.empty()) {
continue;
}
regex_t pattern_nogroup;
if (do_compile(subString, pattern_nogroup, REG_ICASE|REG_EXTENDED|REG_NOSUB)) {
m_matches.push_back(pattern_nogroup);
} else {
regfree(&pattern_nogroup);
m_error = string("Regex compilation error");
m_hasError = true;
return false;
}
}
return true;
}
string Matcher::parse_literal_string_tail(string::const_iterator &start,
const string::const_iterator end)
{
std::string rval;
while (start != end && *start != '"') {
if (*start == '\\') {
++start;
if (start != end) {
switch (*start) {
case 'n':
rval += '\n';
break;
case 't':
rval += '\t';
break;
default:
rval += *start;
break;
}
++start;
}
} else {
rval += *start;
++start;
}
}
if (start == end || *start != '"') {
m_error = string("Unterminated literal string after " + rval);
m_hasError = true;
return string();
}
++start;
return rval;
}
// Returns a substring up to the first metacharacter, including escaped
// metacharacters (parentheses, ~, |, and !)
//
// Advances loc to the first character of 's' following the escaped string.
string Matcher::parse_substr(string::const_iterator &start,
const string::const_iterator &end)
{
std::string rval;
bool done=false;
// Strip leading whitespace.
while (start != end && isspace(*start))
++start;
do {
while (start != end &&
*start != '(' &&
*start != ')' &&
*start != '!' &&
*start != '~' &&
*start != '|' &&
*start != '"' &&
!isspace(*start)) {
rval += *start;
++start;
}
if (start != end && *start == '"') {
++start;
rval += parse_literal_string_tail(start, end);
if (m_hasError) {
return string();
}
}
// We quit because we ran off the end of the string or saw a
// metacharacter. If the latter case and it was a tilde-escape,
// add the escaped character to the string and continue.
if (start != end && start+1 != end && *start == '~') {
const char next = *(start+1);
if (next == '(' || next == ')' ||
next == '!' || next == '~' ||
next == '|' || next == '"' ||
isspace(next)) {
rval += next;
start += 2;
} else {
done = true;
}
} else {
done = true;
}
} while(!done);
return rval;
}
bool Matcher::hasError() const
{
return m_hasError;
}
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