105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef TOOLS_GN_SOURCE_DIR_H_
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#define TOOLS_GN_SOURCE_DIR_H_
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#include <string>
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#include "base/containers/hash_tables.h"
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "base/strings/string_piece.h"
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class SourceFile;
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// Represents a directory within the source tree. Source dirs begin and end in
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// slashes.
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//
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// If there is one slash at the beginning, it will mean a system-absolute file
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// path. On Windows, absolute system paths will be of the form "/C:/foo/bar".
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//
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// Two slashes at the beginning indicate a path relative to the source root.
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class SourceDir {
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public:
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SourceDir();
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explicit SourceDir(const base::StringPiece& p);
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~SourceDir();
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// Resolves a file or dir name relative to this source directory. Will return
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// an empty SourceDir/File on error. Empty input is always an error (it's
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// possible we should say ResolveRelativeDir vs. an empty string should be
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// the source dir, but we require "." instead).
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SourceFile ResolveRelativeFile(const base::StringPiece& p) const;
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SourceDir ResolveRelativeDir(const base::StringPiece& p) const;
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// Resolves this source file relative to some given source root. Returns
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// an empty file path on error.
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base::FilePath Resolve(const base::FilePath& source_root) const;
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bool is_null() const { return value_.empty(); }
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const std::string& value() const { return value_; }
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// Returns true if this path starts with a "//" which indicates a path
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// from the source root.
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bool is_source_absolute() const {
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return value_.size() >= 2 && value_[0] == '/' && value_[1] == '/';
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}
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// Returns true if this path starts with a single slash which indicates a
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// system-absolute path.
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bool is_system_absolute() const {
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return !is_source_absolute();
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}
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// Returns a source-absolute path starting with only one slash at the
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// beginning (normally source-absolute paths start with two slashes to mark
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// them as such). This is normally used when concatenating directories
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// together.
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//
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// This function asserts that the directory is actually source-absolute. The
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// return value points into our buffer.
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base::StringPiece SourceAbsoluteWithOneSlash() const {
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CHECK(is_source_absolute());
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return base::StringPiece(&value_[1], value_.size() - 1);
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}
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void SwapInValue(std::string* v);
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bool operator==(const SourceDir& other) const {
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return value_ == other.value_;
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}
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bool operator!=(const SourceDir& other) const {
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return !operator==(other);
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}
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bool operator<(const SourceDir& other) const {
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return value_ < other.value_;
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}
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private:
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friend class SourceFile;
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std::string value_;
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// Copy & assign supported.
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};
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namespace BASE_HASH_NAMESPACE {
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#if defined(COMPILER_GCC)
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template<> struct hash<SourceDir> {
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std::size_t operator()(const SourceDir& v) const {
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hash<std::string> h;
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return h(v.value());
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}
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};
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#elif defined(COMPILER_MSVC)
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inline size_t hash_value(const SourceDir& v) {
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return hash_value(v.value());
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}
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#endif // COMPILER...
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} // namespace BASE_HASH_NAMESPACE
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#endif // TOOLS_GN_SOURCE_DIR_H_
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