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/*
* Copyright 2014 Google Inc. All Rights Reserved.
*
* 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.
*/
#ifndef COBALT_CSS_PARSER_TRIVIAL_STRING_PIECE_H_
#define COBALT_CSS_PARSER_TRIVIAL_STRING_PIECE_H_
#include <algorithm>
#include <iostream>
#include <string>
#include "base/logging.h"
namespace cobalt {
namespace css_parser {
// A structure that represents a substring. Has trivial constructor and
// destructor in order to allow it to be a member of Bison's YYSTYPE union.
// Used to return a string token value from scanner to parser. All memory
// management is external: strings point either into an input or into a string
// pool injected into the scanner.
struct TrivialStringPiece {
static TrivialStringPiece FromCString(const char* c_string);
inline std::size_t size() const {
DCHECK_LE(begin, end);
return static_cast<std::size_t>(end - begin);
}
inline std::string ToString() const { return std::string(begin, end); }
const char* begin;
const char* end;
};
inline TrivialStringPiece TrivialStringPiece::FromCString(
const char* c_string) {
TrivialStringPiece string_piece;
string_piece.begin = c_string;
string_piece.end = c_string + strlen(c_string);
return string_piece;
}
// Used by tests.
inline bool operator==(const TrivialStringPiece& lhs, const char* rhs) {
return strncmp(lhs.begin, rhs, lhs.size()) == 0 && rhs[lhs.size()] == '\0';
}
// Used by tests.
inline bool operator==(const char* lhs, const TrivialStringPiece& rhs) {
return rhs == lhs;
}
// Used by tests.
inline bool operator!=(const TrivialStringPiece& lhs, const char* rhs) {
return !(lhs == rhs);
}
// Used by tests.
inline bool operator!=(const char* lhs, const TrivialStringPiece& rhs) {
return !(rhs == lhs);
}
// Used by tests.
inline std::ostream& operator<<(std::ostream& stream,
const TrivialStringPiece& string_piece) {
stream << "\"";
for (const char* character_iterator(string_piece.begin);
character_iterator != string_piece.end; ++character_iterator) {
stream << *character_iterator;
}
stream << "\"";
return stream;
}
} // namespace css_parser
} // namespace cobalt
#endif // COBALT_CSS_PARSER_TRIVIAL_STRING_PIECE_H_