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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TOOLS_GN_LOCATION_H_
#define TOOLS_GN_LOCATION_H_
#include <algorithm>
#include "base/logging.h"
class InputFile;
// Represents a place in a source file. Used for error reporting.
class Location {
public:
Location()
: file_(NULL),
line_number_(-1),
char_offset_(-1) {
}
Location(const InputFile* file, int line_number, int char_offset)
: file_(file),
line_number_(line_number),
char_offset_(char_offset) {
}
const InputFile* file() const { return file_; }
int line_number() const { return line_number_; }
int char_offset() const { return char_offset_; }
bool operator==(const Location& other) const {
return other.file_ == file_ &&
other.line_number_ == line_number_ &&
other.char_offset_ == char_offset_;
}
bool operator<(const Location& other) const {
DCHECK(file_ == other.file_);
if (line_number_ != other.line_number_)
return line_number_ < other.line_number_;
return char_offset_ < other.char_offset_;
}
private:
const InputFile* file_; // Null when unset.
int line_number_; // -1 when unset.
int char_offset_; // -1 when unset.
};
// Represents a range in a source file. Used for error reporting.
// The end is exclusive i.e. [begin, end)
class LocationRange {
public:
LocationRange() {}
LocationRange(const Location& begin, const Location& end)
: begin_(begin),
end_(end) {
DCHECK(begin_.file() == end_.file());
}
const Location& begin() const { return begin_; }
const Location& end() const { return end_; }
LocationRange Union(const LocationRange& other) const {
DCHECK(begin_.file() == other.begin_.file());
return LocationRange(
begin_ < other.begin_ ? begin_ : other.begin_,
end_ < other.end_ ? other.end_ : end_);
}
private:
Location begin_;
Location end_;
};
#endif // TOOLS_GN_LOCATION_H_
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