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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_DIR_H_
#define TOOLS_GN_SOURCE_DIR_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 Err;
class SourceFile;
class Value;
// Represents a directory within the source tree. Source dirs begin and end in
// slashes.
//
// If there is one slash at the beginning, it will mean a system-absolute file
// path. On Windows, absolute system paths will be of the form "/C:/foo/bar".
//
// Two slashes at the beginning indicate a path relative to the source root.
class SourceDir {
public:
enum SwapIn { SWAP_IN };
SourceDir();
explicit SourceDir(const base::StringPiece& p);
// Swaps the given string in without copies. The given string will be empty
// after this call.
SourceDir(SwapIn, std::string* s);
~SourceDir();
// Resolves a file or dir name relative to this source directory. Will return
// an empty SourceDir/File on error and set the give *err pointer (required).
// Empty input is always an error.
//
// If source_root is supplied, these functions will additionally handle the
// case where the input is a system-absolute but still inside the source
// tree. This is the case for some external tools.
SourceFile ResolveRelativeFile(
const Value& p,
Err* err,
const base::StringPiece& source_root = base::StringPiece()) const;
SourceDir ResolveRelativeDir(
const Value& p,
Err* err,
const base::StringPiece& source_root = base::StringPiece()) const;
// Like ResolveRelativeDir but takes a separate value (which gets blamed)
// and string to use (in cases where a substring has been extracted from the
// value, as with label resolution).
SourceDir ResolveRelativeDir(
const Value& blame_but_dont_use,
const base::StringPiece& p,
Err* err,
const base::StringPiece& source_root = base::StringPiece()) 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;
bool is_null() const { return value_.empty(); }
const std::string& value() const { return value_; }
// Returns true if this path 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 path 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 directories
// together.
//
// This function asserts that the directory 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);
}
void SwapValue(std::string* v);
bool operator==(const SourceDir& other) const {
return value_ == other.value_;
}
bool operator!=(const SourceDir& other) const {
return !operator==(other);
}
bool operator<(const SourceDir& other) const {
return value_ < other.value_;
}
void swap(SourceDir& other) {
value_.swap(other.value_);
}
private:
friend class SourceFile;
std::string value_;
// Copy & assign supported.
};
namespace BASE_HASH_NAMESPACE {
template<> struct hash<SourceDir> {
std::size_t operator()(const SourceDir& v) const {
hash<std::string> h;
return h(v.value());
}
};
} // namespace BASE_HASH_NAMESPACE
inline void swap(SourceDir& lhs, SourceDir& rhs) {
lhs.swap(rhs);
}
#endif // TOOLS_GN_SOURCE_DIR_H_
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