// 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.

#include "tools/gn/location.h"

#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "tools/gn/input_file.h"

Location::Location()
    : file_(NULL),
      line_number_(-1),
      char_offset_(-1) {
}

Location::Location(const InputFile* file, int line_number, int char_offset)
    : file_(file),
      line_number_(line_number),
      char_offset_(char_offset) {
}

bool Location::operator==(const Location& other) const {
  return other.file_ == file_ &&
         other.line_number_ == line_number_ &&
         other.char_offset_ == char_offset_;
}

bool Location::operator!=(const Location& other) const {
  return !operator==(other);
}

bool Location::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_;
}

std::string Location::Describe(bool include_char_offset) const {
  if (!file_)
    return std::string();

  std::string ret;
  if (file_->friendly_name().empty())
    ret = file_->name().value();
  else
    ret = file_->friendly_name();

  ret += ":";
  ret += base::IntToString(line_number_);
  if (include_char_offset) {
    ret += ":";
    ret += base::IntToString(char_offset_);
  }
  return ret;
}

LocationRange::LocationRange() {
}

LocationRange::LocationRange(const Location& begin, const Location& end)
    : begin_(begin),
      end_(end) {
  DCHECK(begin_.file() == end_.file());
}

LocationRange 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_);
}