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// Copyright (c) 2011 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.
// This class works with command lines: building and parsing.
// Switches can optionally have a value attached using an equals sign, as in
// "-switch=value". Arguments that aren't prefixed with a switch prefix are
// saved as extra arguments. An argument of "--" will terminate switch parsing,
// causing everything after to be considered as extra arguments.
// There is a singleton read-only CommandLine that represents the command line
// that the current process was started with. It must be initialized in main().
#ifndef BASE_COMMAND_LINE_H_
#define BASE_COMMAND_LINE_H_
#pragma once
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "build/build_config.h"
class FilePath;
class CommandLine {
public:
#if defined(OS_WIN)
// The native command line string type.
typedef std::wstring StringType;
#elif defined(OS_POSIX)
typedef std::string StringType;
#endif
typedef std::vector<StringType> StringVector;
// The type of map for parsed-out switch key and values.
typedef std::map<std::string, StringType> SwitchMap;
// A constructor for CommandLines that only carry switches and arguments.
enum NoProgram { NO_PROGRAM };
explicit CommandLine(NoProgram no_program);
// Construct a new command line with |program| as argv[0].
explicit CommandLine(const FilePath& program);
#if defined(OS_POSIX)
CommandLine(int argc, const char* const* argv);
explicit CommandLine(const StringVector& argv);
#endif
~CommandLine();
// Initialize the current process CommandLine singleton. On Windows, ignores
// its arguments (we instead parse GetCommandLineW() directly) because we
// don't trust the CRT's parsing of the command line, but it still must be
// called to set up the command line.
static void Init(int argc, const char* const* argv);
// Destroys the current process CommandLine singleton. This is necessary if
// you want to reset the base library to its initial state (for example, in an
// outer library that needs to be able to terminate, and be re-initialized).
// If Init is called only once, as in main(), Reset() is not necessary.
static void Reset();
// Get the singleton CommandLine representing the current process's
// command line. Note: returned value is mutable, but not thread safe;
// only mutate if you know what you're doing!
static CommandLine* ForCurrentProcess();
#if defined(OS_WIN)
static CommandLine FromString(const std::wstring& command_line);
#endif
#if defined(OS_POSIX)
// Initialize from an argv vector.
void InitFromArgv(int argc, const char* const* argv);
void InitFromArgv(const StringVector& argv);
#endif
// Returns the represented command line string.
// CAUTION! This should be avoided because quoting behavior is unclear.
StringType command_line_string() const;
#if defined(OS_POSIX)
// Returns the original command line string as a vector of strings.
const StringVector& argv() const { return argv_; }
#endif
// Returns the program part of the command line string (the first item).
FilePath GetProgram() const;
// Returns true if this command line contains the given switch.
// (Switch names are case-insensitive).
bool HasSwitch(const std::string& switch_string) const;
// Returns the value associated with the given switch. If the switch has no
// value or isn't present, this method returns the empty string.
std::string GetSwitchValueASCII(const std::string& switch_string) const;
FilePath GetSwitchValuePath(const std::string& switch_string) const;
StringType GetSwitchValueNative(const std::string& switch_string) const;
// Get the number of switches in this process.
// TODO(msw): Remove unnecessary API.
size_t GetSwitchCount() const;
// Get a copy of all switches, along with their values.
const SwitchMap& GetSwitches() const { return switches_; }
// Append a switch [with optional value] to the command line.
// CAUTION! Appending a switch after the "--" switch terminator is futile!
void AppendSwitch(const std::string& switch_string);
void AppendSwitchPath(const std::string& switch_string, const FilePath& path);
void AppendSwitchNative(const std::string& switch_string,
const StringType& value);
void AppendSwitchASCII(const std::string& switch_string,
const std::string& value);
void AppendSwitches(const CommandLine& other);
// Copy a set of switches (and any values) from another command line.
// Commonly used when launching a subprocess.
void CopySwitchesFrom(const CommandLine& source, const char* const switches[],
size_t count);
// Get the remaining arguments to the command.
const StringVector& args() const { return args_; }
// Append an argument to the command line. Note that the argument is quoted
// properly such that it is interpreted as one argument to the target command.
// AppendArg is primarily for ASCII; non-ASCII input is interpreted as UTF-8.
void AppendArg(const std::string& value);
void AppendArgPath(const FilePath& value);
void AppendArgNative(const StringType& value);
void AppendArgs(const CommandLine& other);
// Append the arguments from another command line to this one.
// If |include_program| is true, include |other|'s program as well.
void AppendArguments(const CommandLine& other,
bool include_program);
// Insert a command before the current command.
// Common for debuggers, like "valgrind" or "gdb --args".
void PrependWrapper(const StringType& wrapper);
#if defined(OS_WIN)
// Initialize by parsing the given command line string.
// The program name is assumed to be the first item in the string.
void ParseFromString(const std::wstring& command_line);
#endif
private:
// Disallow public default construction; a program name must be specified.
CommandLine();
// The singleton CommandLine representing the current process's command line.
static CommandLine* current_process_commandline_;
// We store a platform-native version of the command line, used when building
// up a new command line to be executed. This ifdef delimits that code.
#if defined(OS_WIN)
// The quoted, space-separated command line string.
StringType command_line_string_;
// The name of the program.
StringType program_;
#elif defined(OS_POSIX)
// The argv array, with the program name in argv_[0].
StringVector argv_;
#endif
// Parsed-out switch keys and values.
SwitchMap switches_;
// Non-switch command line arguments.
StringVector args_;
// Allow the copy constructor. A common pattern is to copy the current
// process's command line and then add some flags to it. For example:
// CommandLine cl(*CommandLine::ForCurrentProcess());
// cl.AppendSwitch(...);
};
#endif // BASE_COMMAND_LINE_H_
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