blob: dd2ac039710bc781bb487f1f46972815eac1dc3a [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (c) 2013-2014, Regents of the University of California.
* All rights reserved.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* This file licensed under New BSD License. See COPYING for detailed information about
* ndn-cxx library copyright, permissions, and redistribution restrictions.
*
* @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
*/
#include "regex-top-matcher.hpp"
#include "regex-backref-manager.hpp"
#include "regex-pattern-list-matcher.hpp"
namespace ndn {
RegexTopMatcher::RegexTopMatcher(const std::string& expr, const std::string& expand)
: RegexMatcher(expr, EXPR_TOP)
, m_expand(expand)
, m_isSecondaryUsed(false)
{
m_primaryBackrefManager = make_shared<RegexBackrefManager>();
m_secondaryBackrefManager = make_shared<RegexBackrefManager>();
compile();
}
RegexTopMatcher::~RegexTopMatcher()
{
}
void
RegexTopMatcher::compile()
{
std::string errMsg = "Error: RegexTopMatcher.Compile(): ";
std::string expr = m_expr;
if ('$' != expr[expr.size() - 1])
expr = expr + "<.*>*";
else
expr = expr.substr(0, expr.size() - 1);
if ('^' != expr[0]) {
m_secondaryMatcher = make_shared<RegexPatternListMatcher>(
"<.*>*" + expr,
cref(m_secondaryBackrefManager));
}
else {
expr = expr.substr(1, expr.size() - 1);
}
m_primaryMatcher = make_shared<RegexPatternListMatcher>(func_lib::cref(expr),
func_lib::cref(m_primaryBackrefManager));
}
bool
RegexTopMatcher::match(const Name& name)
{
m_isSecondaryUsed = false;
m_matchResult.clear();
if (m_primaryMatcher->match(name, 0, name.size()))
{
m_matchResult = m_primaryMatcher->getMatchResult();
return true;
}
else
{
if (static_cast<bool>(m_secondaryMatcher) && m_secondaryMatcher->match(name, 0, name.size()))
{
m_matchResult = m_secondaryMatcher->getMatchResult();
m_isSecondaryUsed = true;
return true;
}
return false;
}
}
bool
RegexTopMatcher::match(const Name& name, size_t, size_t)
{
return match(name);
}
Name
RegexTopMatcher::expand(const std::string& expandStr)
{
Name result;
shared_ptr<RegexBackrefManager> backrefManager =
(m_isSecondaryUsed ? m_secondaryBackrefManager : m_primaryBackrefManager);
size_t backrefNo = backrefManager->size();
std::string expand;
if (!expandStr.empty())
expand = expandStr;
else
expand = m_expand;
size_t offset = 0;
while (offset < expand.size())
{
std::string item = getItemFromExpand(expand, offset);
if (item[0] == '<')
{
result.append(item.substr(1, item.size() - 2));
}
if (item[0] == '\\')
{
size_t index = boost::lexical_cast<size_t>(item.substr(1, item.size() - 1));
if (0 == index) {
std::vector<name::Component>::iterator it = m_matchResult.begin();
std::vector<name::Component>::iterator end = m_matchResult.end();
for (; it != end; it++)
result.append(*it);
}
else if (index <= backrefNo)
{
std::vector<name::Component>::const_iterator it =
backrefManager->getBackref(index - 1)->getMatchResult().begin();
std::vector<name::Component>::const_iterator end =
backrefManager->getBackref(index - 1)->getMatchResult().end();
for (; it != end; it++)
result.append(*it);
}
else
throw RegexMatcher::Error("Exceed the range of back reference");
}
}
return result;
}
std::string
RegexTopMatcher::getItemFromExpand(const std::string& expand, size_t& offset)
{
size_t begin = offset;
if (expand[offset] == '\\')
{
offset++;
if (offset >= expand.size())
throw RegexMatcher::Error("wrong format of expand string!");
while (expand[offset] <= '9' and expand[offset] >= '0') {
offset++;
if (offset > expand.size())
throw RegexMatcher::Error("wrong format of expand string!");
}
if (offset > begin + 1)
return expand.substr(begin, offset - begin);
else
throw RegexMatcher::Error("wrong format of expand string!");
}
else if (expand[offset] == '<')
{
offset++;
if (offset >= expand.size())
throw RegexMatcher::Error("wrong format of expand string!");
size_t left = 1;
size_t right = 0;
while (right < left)
{
if (expand[offset] == '<')
left++;
if (expand[offset] == '>')
right++;
offset++;
if (offset >= expand.size())
throw RegexMatcher::Error("wrong format of expand string!");
}
return expand.substr(begin, offset - begin);
}
else
throw RegexMatcher::Error("wrong format of expand string!");
}
shared_ptr<RegexTopMatcher>
RegexTopMatcher::fromName(const Name& name, bool hasAnchor)
{
std::string regexStr("^");
for (Name::const_iterator it = name.begin(); it != name.end(); it++)
{
regexStr.append("<");
regexStr.append(convertSpecialChar(it->toEscapedString()));
regexStr.append(">");
}
if (hasAnchor)
regexStr.append("$");
// OSX 10.9 has problems with just cref
return make_shared<RegexTopMatcher>(func_lib::cref(regexStr));
}
std::string
RegexTopMatcher::convertSpecialChar(const std::string& str)
{
std::string newStr;
for (size_t i = 0; i < str.size(); i++)
{
char c = str[i];
switch (c)
{
case '.':
case '[':
case '{':
case '}':
case '(':
case ')':
case '\\':
case '*':
case '+':
case '?':
case '|':
case '^':
case '$':
newStr.push_back('\\');
// Fallthrough
default:
newStr.push_back(c);
break;
}
}
return newStr;
}
} // namespace ndn