blob: 45b1f2577f9f28be06a3a717ab95fb4df5930694 [file] [log] [blame]
// 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 <stddef.h>
#include <ostream>
#include <string>
#include <vector>
#include "gn/config.h"
#include "gn/config_values.h"
#include "gn/target.h"
struct EscapeOptions;
// Provides a way to iterate through all ConfigValues applying to a given
// target. This is more complicated than normal because the target has a list
// of configs applying to it, and also config values on the target itself.
// This iterator allows one to iterate through all of these in a defined order
// in one convenient loop. The order is defined to be the ConfigValues on the
// target itself first, then the applying configs, in order.
// Example:
// for (ConfigValueIterator iter(target); !iter.done(); iter.Next())
// DoSomething(iter.cur());
class ConfigValuesIterator {
explicit ConfigValuesIterator(const Target* target) : target_(target) {
// If the target doesn't have its own config_values()
if (!target->has_config_values()) {
cur_index_ = 0;
bool done() const {
return cur_index_ >= static_cast<int>(target_->configs().size());
const ConfigValues& cur() const {
if (cur_index_ == -1)
return target_->config_values();
return target_->configs()[cur_index_].ptr->resolved_values();
// Returns the origin of who added this config, if any. This will always be
// null for the config values of a target itself.
const ParseNode* origin() const {
if (cur_index_ == -1)
return nullptr;
return target_->configs()[cur_index_].origin;
void Next() { cur_index_++; }
// Returns the config holding the current config values, or NULL for those
// config values associated with the target itself.
const Config* GetCurrentConfig() const {
if (cur_index_ == -1)
return nullptr;
return target_->configs()[cur_index_].ptr;
const Target* target_;
// Represents an index into the target_'s configs() or, when -1, the config
// values on the target itself.
int cur_index_ = -1;
enum RecursiveWriterConfig {
// Writes a given config value that applies to a given target. This collects
// all values from the target itself and all configs that apply, and writes
// then in order.
template <typename T, class Writer>
inline void RecursiveTargetConfigToStream(
RecursiveWriterConfig config,
const Target* target,
const std::vector<T>& (ConfigValues::*getter)() const,
const Writer& writer,
std::ostream& out) {
std::set<T> seen;
for (ConfigValuesIterator iter(target); !iter.done(); iter.Next()) {
const std::vector<T>& values = ((iter.cur()).*getter)();
for (size_t i = 0; i < values.size(); i++) {
switch (config) {
case kRecursiveWriterKeepDuplicates:
writer(values[i], out);
case kRecursiveWriterSkipDuplicates:
if (seen.find(values[i]) == seen.end()) {
writer(values[i], out);
// Writes the values out as strings with no transformation.
void RecursiveTargetConfigStringsToStream(
RecursiveWriterConfig config,
const Target* target,
const std::vector<std::string>& (ConfigValues::*getter)() const,
const EscapeOptions& escape_options,
std::ostream& out);