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// Copyright (C) 2011 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: George Yakovlev
#include "regexp_adapter.h"
#include <re2/re2.h>
#include <re2/stringpiece.h>
#include <re2/re2.h>
namespace {
scoped_ptr<RE2Cache> re2_cache;
} // namespace
class RE2RegularExpressionInput : public RegularExpressionInput {
public:
RE2RegularExpressionInput(const char* utf8_input);
virtual bool ConsumeRegExp(std::string const& reg_exp,
bool beginning_only,
std::string* matched_string1,
std::string* matched_string2);
virtual std::string ToString() const;
private:
StringPiece utf8_input_;
};
class RE2RegularExpression : public reg_exp::RegularExpression {
public:
RE2RegularExpression(const char* utf8_regexp);
virtual bool Consume(reg_exp::RegularExpressionInput* input_string,
bool beginning_only,
std::string* matched_string1,
std::string* matched_string2,
std::string* matched_string3) const;
virtual bool Match(const char* input_string,
bool full_match,
std::string* matched_string) const;
virtual bool Replace(std::string* string_to_process,
bool global,
const char* replacement_string) const;
private:
RE2 utf8_regexp_;
};
RE2RegularExpressionInput::RE2RegularExpressionInput(const char* utf8_input)
: utf8_input_(utf8_input) {
DCHECK(utf8_input);
}
bool RE2RegularExpressionInput::ConsumeRegExp(std::string const& reg_exp,
bool beginning_only,
std::string* matched_string1,
std::string* matched_string2) {
if (beginning_only) {
if (matched_string2)
return RE2::Consume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(), reg_exp),
matched_string1, matched_string2);
else if (matched_string1)
return RE2::Consume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(), reg_exp),
matched_string1);
else
return RE2::Consume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(), reg_exp));
} else {
if (matched_string2)
return RE2::FindAndConsume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(),
reg_exp),
matched_string1, matched_string2);
else if (matched_string1)
return RE2::FindAndConsume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(),
reg_exp),
matched_string1);
else
return RE2::FindAndConsume(&utf8_input_,
RE2Cache::ScopedAccess(re2_cache.get(),
reg_exp));
}
}
std::string RE2RegularExpressionInput::ToString() const {
utf8_input_.ToString();
}
RE2RegularExpression::RE2RegularExpression(const char* utf8_regexp)
: utf8_regexp_(utf8_regexp) {
DCHECK(utf8_regexp);
}
bool RE2RegularExpression::Consume(RegularExpressionInput* input_string,
bool beginning_only,
std::string* matched_string1,
std::string* matched_string2,
std::string* matched_string3) const {
DCHECK(input_string);
// matched_string1 may be NULL
// matched_string2 may be NULL
if (beginning_only) {
if (matched_string3) {
return RE2::Consume(input_string, utf8_regexp_,
matched_string1, matched_string2, matched_string3);
} else if (matched_string2) {
return RE2::Consume(input_string, utf8_regexp_,
matched_string1, matched_string2);
} else if (matched_string1) {
return RE2::Consume(input_string, utf8_regexp_, matched_string1);
} else {
return RE2::Consume(input_string, utf8_regexp_);
}
} else {
if (matched_string3) {
return RE2::FindAndConsume(input_string, utf8_regexp_,
matched_string1, matched_string2,
matched_string3);
} else if (matched_string2) {
return RE2::FindAndConsume(input_string, utf8_regexp_,
matched_string1, matched_string2);
} else if (matched_string1) {
return RE2::FindAndConsume(input_string, utf8_regexp_, matched_string1);
} else {
return RE2::FindAndConsume(input_string, utf8_regexp_);
}
}
}
bool RE2RegularExpression::Match(const char* input_string,
bool full_match,
std::string* matched_string) const {
DCHECK(input_string);
// matched_string may be NULL
if (full_match) {
if (matched_string)
return RE2::FullMatch(input_string, matched_string);
else
return RE2::FullMatch(input_string);
} else {
if (matched_string)
return RE2::PartialMatch(input_string, matched_string);
else
return RE2::PartialMatch(input_string);
}
}
bool RE2RegularExpression::Replace(std::string* string_to_process,
bool global,
const char* replacement_string) const {
DCHECK(string_to_process);
DCHECK(replacement_string);
if (global) {
StringPiece str(replacement_string);
return RE2::GlobalReplace(string_to_process, str);
} else {
return RE2::Replace(string_to_process, replacement_string);
}
}
namespace reg_exp {
RegularExpressionInput* CreateRegularExpressionInput(const char* utf8_input) {
if (!re2_cache.get())
re2_cache.reset(new RE2Cache(64));
return new RE2RegularExpressionInput(utf8_input);
}
RegularExpression* CreateRegularExpression(const char* utf8_regexp) {
if (!re2_cache.get())
re2_cache.reset(new RE2Cache(64));
return new RE2RegularExpression(utf8_regexp);
}
} // namespace reg_exp
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