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//===-- MIUtilParse.cpp ----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Third party headers:
#include <memory>
// In-house headers:
#include "MIUtilParse.h"
//++ ------------------------------------------------------------------------------------
// Details: CRegexParser constructor.
// Type: Method.
// Args: regexStr - Pointer to the regular expression to compile.
// Return: None.
// Throws: None.
//--
MIUtilParse::CRegexParser::CRegexParser(const char *regexStr)
: m_isValid(llvm_regcomp(&m_emma, regexStr, REG_EXTENDED) == 0)
{
}
//++ ------------------------------------------------------------------------------------
// Details: CRegexParser destructor.
// Type: Method.
// Args: None.
// Return: None.
// Throws: None.
//--
MIUtilParse::CRegexParser::~CRegexParser()
{
// Free up memory held within regex.
if (m_isValid)
llvm_regfree(&m_emma);
}
//++ ------------------------------------------------------------------------------------
// Details: CRegexParser regex executer.
// Match the input against the regular expression. Return an error
// if the number of matches is less than minMatches. If the default
// minMatches value of 0 is passed, an error will be returned if
// the number of matches is less than the maxMatches value used to
// initialize Match.
// Type: Method.
// Args: input (R) - Pointer to UTF8 text data to be parsed.
// match (RW) - Reference to Match class.
// minMatches (R) - Minimum number of regex matches expected.
// Return: bool - True = minimum matches were met,
// false = minimum matches were not met or regex failed.
// Throws: None.
//--
bool
MIUtilParse::CRegexParser::Execute(const char *input, Match& match, size_t minMatches)
{
if (!m_isValid)
return false;
std::unique_ptr<llvm_regmatch_t[]> matches(new llvm_regmatch_t[match.m_maxMatches]); // Array of matches
if (llvm_regexec(&m_emma, input, match.m_maxMatches, matches.get(), 0) != 0)
return false;
size_t i;
for (i = 0; i < match.m_maxMatches && matches[i].rm_so >= 0; i++)
{
const int n = matches[i].rm_eo - matches[i].rm_so;
match.m_matchStrs[i].assign(input + matches[i].rm_so, n);
}
return i >= minMatches;
}
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