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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_NINJA_TARGET_WRITER_H_
#define TOOLS_GN_NINJA_TARGET_WRITER_H_
#include <iosfwd>
#include "base/macros.h"
#include "tools/gn/path_output.h"
#include "tools/gn/substitution_type.h"
class OutputFile;
class Settings;
class Target;
struct SubstitutionBits;
// Generates one target's ".ninja" file. The toplevel "build.ninja" file is
// generated by the NinjaBuildWriter.
class NinjaTargetWriter {
public:
NinjaTargetWriter(const Target* target, std::ostream& out);
virtual ~NinjaTargetWriter();
// Returns the build line to be written to the toolchain build file.
//
// Some targets have their rules written to separate files, and some can have
// their rules coalesced in the main build file. For the coalesced case, this
// function will return the rules as a string. For the separate file case,
// the separate ninja file will be written and the return string will be the
// subninja command to load that file.
static std::string RunAndWriteFile(const Target* target);
virtual void Run() = 0;
protected:
// Writes out the substitution values that are shared between the different
// types of tools (target gen dir, target label, etc.). Only the substitutions
// identified by the given bits will be written.
void WriteSharedVars(const SubstitutionBits& bits);
// Writes to the output stream a stamp rule for input dependencies, and
// returns the file to be appended to source rules that encodes the
// order-only dependencies for the current target.
// If num_stamp_uses is small, this might return all input dependencies
// directly, without writing a stamp file.
// If there are no implicit dependencies and no extra target dependencies
// are passed in, this returns an empty vector.
std::vector<OutputFile> WriteInputDepsStampAndGetDep(
const std::vector<const Target*>& extra_hard_deps,
size_t num_stamp_uses) const;
// Writes to the output file a final stamp rule for the target that stamps
// the given list of files. This function assumes the stamp is for the target
// as a whole so the stamp file is set as the target's dependency output.
void WriteStampForTarget(const std::vector<OutputFile>& deps,
const std::vector<OutputFile>& order_only_deps);
const Settings* settings_; // Non-owning.
const Target* target_; // Non-owning.
std::ostream& out_;
PathOutput path_output_;
private:
void WriteCopyRules();
void WriteEscapedSubstitution(SubstitutionType type);
DISALLOW_COPY_AND_ASSIGN(NinjaTargetWriter);
};
#endif // TOOLS_GN_NINJA_TARGET_WRITER_H_
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