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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_SOURCE_FILE_H_
#define TOOLS_GN_SOURCE_FILE_H_
#include <stddef.h>
#include <algorithm>
#include <string>
#include "base/containers/hash_tables.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/strings/string_piece.h"
class SourceDir;
// Represents a file within the source tree. Always begins in a slash, never
// ends in one.
class SourceFile {
public:
enum SwapIn { SWAP_IN };
SourceFile();
// Takes a known absolute source file. Always begins in a slash.
explicit SourceFile(const base::StringPiece& p);
// Constructs from the given string by swapping in the contents of the given
// value. The value will be the empty string after this call.
SourceFile(SwapIn, std::string* value);
~SourceFile();
bool is_null() const { return value_.empty(); }
const std::string& value() const { return value_; }
// Returns everything after the last slash.
std::string GetName() const;
SourceDir GetDir() const;
// Resolves this source file relative to some given source root. Returns
// an empty file path on error.
base::FilePath Resolve(const base::FilePath& source_root) const;
// Returns true if this file starts with a "//" which indicates a path
// from the source root.
bool is_source_absolute() const {
return value_.size() >= 2 && value_[0] == '/' && value_[1] == '/';
}
// Returns true if this file starts with a single slash which indicates a
// system-absolute path.
bool is_system_absolute() const {
return !is_source_absolute();
}
// Returns a source-absolute path starting with only one slash at the
// beginning (normally source-absolute paths start with two slashes to mark
// them as such). This is normally used when concatenating names together.
//
// This function asserts that the file is actually source-absolute. The
// return value points into our buffer.
base::StringPiece SourceAbsoluteWithOneSlash() const {
CHECK(is_source_absolute());
return base::StringPiece(&value_[1], value_.size() - 1);
}
bool operator==(const SourceFile& other) const {
return value_ == other.value_;
}
bool operator!=(const SourceFile& other) const {
return !operator==(other);
}
bool operator<(const SourceFile& other) const {
return value_ < other.value_;
}
void swap(SourceFile& other) {
value_.swap(other.value_);
}
private:
friend class SourceDir;
std::string value_;
// Copy & assign supported.
};
namespace BASE_HASH_NAMESPACE {
template<> struct hash<SourceFile> {
std::size_t operator()(const SourceFile& v) const {
hash<std::string> h;
return h(v.value());
}
};
} // namespace BASE_HASH_NAMESPACE
inline void swap(SourceFile& lhs, SourceFile& rhs) {
lhs.swap(rhs);
}
#endif // TOOLS_GN_SOURCE_FILE_H_
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