michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/command_line.h"
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: #include <windows.h>
michael@0: #include <shellapi.h>
michael@0: #endif
michael@0: 
michael@0: #include <algorithm>
michael@0: 
michael@0: #include "base/logging.h"
michael@0: #include "base/singleton.h"
michael@0: #include "base/string_piece.h"
michael@0: #include "base/string_util.h"
michael@0: #include "base/sys_string_conversions.h"
michael@0: 
michael@0: CommandLine* CommandLine::current_process_commandline_ = NULL;
michael@0: 
michael@0: // Since we use a lazy match, make sure that longer versions (like L"--")
michael@0: // are listed before shorter versions (like L"-") of similar prefixes.
michael@0: #if defined(OS_WIN)
michael@0: const wchar_t* const kSwitchPrefixes[] = {L"--", L"-", L"/"};
michael@0: const wchar_t kSwitchTerminator[] = L"--";
michael@0: const wchar_t kSwitchValueSeparator[] = L"=";
michael@0: #elif defined(OS_POSIX)
michael@0: // Unixes don't use slash as a switch.
michael@0: const char* const kSwitchPrefixes[] = {"--", "-"};
michael@0: const char kSwitchTerminator[] = "--";
michael@0: const char kSwitchValueSeparator[] = "=";
michael@0: #endif
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: // Lowercase a string.  This is used to lowercase switch names.
michael@0: // Is this what we really want?  It seems crazy to me.  I've left it in
michael@0: // for backwards compatibility on Windows.
michael@0: static void Lowercase(std::wstring* parameter) {
michael@0:   transform(parameter->begin(), parameter->end(), parameter->begin(),
michael@0:             tolower);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: void CommandLine::ParseFromString(const std::wstring& command_line) {
michael@0:   TrimWhitespace(command_line, TRIM_ALL, &command_line_string_);
michael@0: 
michael@0:   if (command_line_string_.empty())
michael@0:     return;
michael@0: 
michael@0:   int num_args = 0;
michael@0:   wchar_t** args = NULL;
michael@0: 
michael@0:   args = CommandLineToArgvW(command_line_string_.c_str(), &num_args);
michael@0: 
michael@0:   // Populate program_ with the trimmed version of the first arg.
michael@0:   TrimWhitespace(args[0], TRIM_ALL, &program_);
michael@0: 
michael@0:   bool parse_switches = true;
michael@0:   for (int i = 1; i < num_args; ++i) {
michael@0:     std::wstring arg;
michael@0:     TrimWhitespace(args[i], TRIM_ALL, &arg);
michael@0: 
michael@0:     if (!parse_switches) {
michael@0:       loose_values_.push_back(arg);
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     if (arg == kSwitchTerminator) {
michael@0:       parse_switches = false;
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     std::string switch_string;
michael@0:     std::wstring switch_value;
michael@0:     if (IsSwitch(arg, &switch_string, &switch_value)) {
michael@0:       switches_[switch_string] = switch_value;
michael@0:     } else {
michael@0:       loose_values_.push_back(arg);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (args)
michael@0:     LocalFree(args);
michael@0: }
michael@0: CommandLine::CommandLine(const std::wstring& program) {
michael@0:   if (!program.empty()) {
michael@0:     program_ = program;
michael@0:     command_line_string_ = L'"' + program + L'"';
michael@0:   }
michael@0: }
michael@0: #elif defined(OS_POSIX)
michael@0: CommandLine::CommandLine(int argc, const char* const* argv) {
michael@0:   for (int i = 0; i < argc; ++i)
michael@0:     argv_.push_back(argv[i]);
michael@0:   InitFromArgv();
michael@0: }
michael@0: CommandLine::CommandLine(const std::vector<std::string>& argv) {
michael@0:   argv_ = argv;
michael@0:   InitFromArgv();
michael@0: }
michael@0: 
michael@0: void CommandLine::InitFromArgv() {
michael@0:   bool parse_switches = true;
michael@0:   for (size_t i = 1; i < argv_.size(); ++i) {
michael@0:     const std::string& arg = argv_[i];
michael@0: 
michael@0:     if (!parse_switches) {
michael@0:       loose_values_.push_back(arg);
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     if (arg == kSwitchTerminator) {
michael@0:       parse_switches = false;
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     std::string switch_string;
michael@0:     std::string switch_value;
michael@0:     if (IsSwitch(arg, &switch_string, &switch_value)) {
michael@0:       switches_[switch_string] = switch_value;
michael@0:     } else {
michael@0:       loose_values_.push_back(arg);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: CommandLine::CommandLine(const std::wstring& program) {
michael@0:   argv_.push_back(WideToASCII(program));
michael@0: }
michael@0: #endif
michael@0: 
michael@0: // static
michael@0: bool CommandLine::IsSwitch(const StringType& parameter_string,
michael@0:                            std::string* switch_string,
michael@0:                            StringType* switch_value) {
michael@0:   switch_string->clear();
michael@0:   switch_value->clear();
michael@0: 
michael@0:   for (size_t i = 0; i < arraysize(kSwitchPrefixes); ++i) {
michael@0:     StringType prefix(kSwitchPrefixes[i]);
michael@0:     if (parameter_string.find(prefix) != 0)
michael@0:       continue;
michael@0: 
michael@0:     const size_t switch_start = prefix.length();
michael@0:     const size_t equals_position = parameter_string.find(
michael@0:         kSwitchValueSeparator, switch_start);
michael@0:     StringType switch_native;
michael@0:     if (equals_position == StringType::npos) {
michael@0:       switch_native = parameter_string.substr(switch_start);
michael@0:     } else {
michael@0:       switch_native = parameter_string.substr(
michael@0:           switch_start, equals_position - switch_start);
michael@0:       *switch_value = parameter_string.substr(equals_position + 1);
michael@0:     }
michael@0: #if defined(OS_WIN)
michael@0:     Lowercase(&switch_native);
michael@0:     *switch_string = WideToASCII(switch_native);
michael@0: #else
michael@0:     *switch_string = switch_native;
michael@0: #endif
michael@0: 
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: // static
michael@0: void CommandLine::Init(int argc, const char* const* argv) {
michael@0:   DCHECK(current_process_commandline_ == NULL);
michael@0: #if defined(OS_WIN)
michael@0:   current_process_commandline_ = new CommandLine;
michael@0:   current_process_commandline_->ParseFromString(::GetCommandLineW());
michael@0: #elif defined(OS_POSIX)
michael@0:   current_process_commandline_ = new CommandLine(argc, argv);
michael@0: #endif
michael@0: }
michael@0: 
michael@0: void CommandLine::Terminate() {
michael@0:   DCHECK(current_process_commandline_ != NULL);
michael@0:   delete current_process_commandline_;
michael@0:   current_process_commandline_ = NULL;
michael@0: }
michael@0: 
michael@0: bool CommandLine::HasSwitch(const std::wstring& switch_string) const {
michael@0:   std::wstring lowercased_switch(switch_string);
michael@0: #if defined(OS_WIN)
michael@0:   Lowercase(&lowercased_switch);
michael@0: #endif
michael@0:   return switches_.find(WideToASCII(lowercased_switch)) != switches_.end();
michael@0: }
michael@0: 
michael@0: std::wstring CommandLine::GetSwitchValue(
michael@0:     const std::wstring& switch_string) const {
michael@0:   std::wstring lowercased_switch(switch_string);
michael@0: #if defined(OS_WIN)
michael@0:   Lowercase(&lowercased_switch);
michael@0: #endif
michael@0: 
michael@0:   std::map<std::string, StringType>::const_iterator result =
michael@0:       switches_.find(WideToASCII(lowercased_switch));
michael@0: 
michael@0:   if (result == switches_.end()) {
michael@0:     return L"";
michael@0:   } else {
michael@0: #if defined(OS_WIN)
michael@0:     return result->second;
michael@0: #else
michael@0:     return ASCIIToWide(result->second);
michael@0: #endif
michael@0:   }
michael@0: }
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: std::vector<std::wstring> CommandLine::GetLooseValues() const {
michael@0:   return loose_values_;
michael@0: }
michael@0: std::wstring CommandLine::program() const {
michael@0:   return program_;
michael@0: }
michael@0: #else
michael@0: std::vector<std::wstring> CommandLine::GetLooseValues() const {
michael@0:   std::vector<std::wstring> values;
michael@0:   for (size_t i = 0; i < loose_values_.size(); ++i)
michael@0:     values.push_back(ASCIIToWide(loose_values_[i]));
michael@0:   return values;
michael@0: }
michael@0: std::wstring CommandLine::program() const {
michael@0:   DCHECK(argv_.size() > 0);
michael@0:   return ASCIIToWide(argv_[0]);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: 
michael@0: // static
michael@0: std::wstring CommandLine::PrefixedSwitchString(
michael@0:     const std::wstring& switch_string) {
michael@0:   return StringPrintf(L"%ls%ls",
michael@0:                       kSwitchPrefixes[0],
michael@0:                       switch_string.c_str());
michael@0: }
michael@0: 
michael@0: // static
michael@0: std::wstring CommandLine::PrefixedSwitchStringWithValue(
michael@0:     const std::wstring& switch_string, const std::wstring& value_string) {
michael@0:   if (value_string.empty()) {
michael@0:     return PrefixedSwitchString(switch_string);
michael@0:   }
michael@0: 
michael@0:   return StringPrintf(L"%ls%ls%ls%ls",
michael@0:                       kSwitchPrefixes[0],
michael@0:                       switch_string.c_str(),
michael@0:                       kSwitchValueSeparator,
michael@0:                       value_string.c_str());
michael@0: }
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: void CommandLine::AppendSwitch(const std::wstring& switch_string) {
michael@0:   std::wstring prefixed_switch_string = PrefixedSwitchString(switch_string);
michael@0:   command_line_string_.append(L" ");
michael@0:   command_line_string_.append(prefixed_switch_string);
michael@0:   switches_[WideToASCII(switch_string)] = L"";
michael@0: }
michael@0: 
michael@0: // Quote a string if necessary, such that CommandLineToArgvW() will
michael@0: // always process it as a single argument.
michael@0: static std::wstring WindowsStyleQuote(const std::wstring& arg) {
michael@0:   // We follow the quoting rules of CommandLineToArgvW.
michael@0:   // http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
michael@0:   if (arg.find_first_of(L" \\\"\t") == std::wstring::npos) {
michael@0:     // No quoting necessary.
michael@0:     return arg;
michael@0:   }
michael@0: 
michael@0:   std::wstring out;
michael@0:   out.push_back(L'"');
michael@0:   for (size_t i = 0; i < arg.size(); ++i) {
michael@0:     if (arg[i] == '\\') {
michael@0:       // Find the extent of this run of backslashes.
michael@0:       size_t start = i, end = start + 1;
michael@0:       for (; end < arg.size() && arg[end] == '\\'; ++end)
michael@0:         /* empty */;
michael@0:       size_t backslash_count = end - start;
michael@0: 
michael@0:       // Backslashes are escapes only if the run is followed by a double quote.
michael@0:       // Since we also will end the string with a double quote, we escape for
michael@0:       // either a double quote or the end of the string.
michael@0:       if (end == arg.size() || arg[end] == '"') {
michael@0:         // To quote, we need to output 2x as many backslashes.
michael@0:         backslash_count *= 2;
michael@0:       }
michael@0:       for (size_t j = 0; j < backslash_count; ++j)
michael@0:         out.push_back('\\');
michael@0: 
michael@0:       // Advance i to one before the end to balance i++ in loop.
michael@0:       i = end - 1;
michael@0:     } else if (arg[i] == '"') {
michael@0:       out.push_back('\\');
michael@0:       out.push_back('"');
michael@0:     } else {
michael@0:       out.push_back(arg[i]);
michael@0:     }
michael@0:   }
michael@0:   out.push_back('"');
michael@0: 
michael@0:   return out;
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendSwitchWithValue(const std::wstring& switch_string,
michael@0:                                         const std::wstring& value_string) {
michael@0:   std::wstring quoted_value_string = WindowsStyleQuote(value_string);
michael@0:   std::wstring combined_switch_string =
michael@0:     PrefixedSwitchStringWithValue(switch_string, quoted_value_string);
michael@0: 
michael@0:   command_line_string_.append(L" ");
michael@0:   command_line_string_.append(combined_switch_string);
michael@0: 
michael@0:   switches_[WideToASCII(switch_string)] = value_string;
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendLooseValue(const std::wstring& value) {
michael@0:   command_line_string_.append(L" ");
michael@0:   command_line_string_.append(WindowsStyleQuote(value));
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendArguments(const CommandLine& other,
michael@0:                                   bool include_program) {
michael@0:   // Verify include_program is used correctly.
michael@0:   // Logic could be shorter but this is clearer.
michael@0:   DCHECK(include_program ? !other.program().empty() : other.program().empty());
michael@0:   command_line_string_ += L" " + other.command_line_string_;
michael@0:   std::map<std::string, StringType>::const_iterator i;
michael@0:   for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
michael@0:     switches_[i->first] = i->second;
michael@0: }
michael@0: 
michael@0: void CommandLine::PrependWrapper(const std::wstring& wrapper) {
michael@0:   // The wrapper may have embedded arguments (like "gdb --args"). In this case,
michael@0:   // we don't pretend to do anything fancy, we just split on spaces.
michael@0:   std::vector<std::wstring> wrapper_and_args;
michael@0:   SplitString(wrapper, ' ', &wrapper_and_args);
michael@0:   program_ = wrapper_and_args[0];
michael@0:   command_line_string_ = wrapper + L" " + command_line_string_;
michael@0: }
michael@0: 
michael@0: #elif defined(OS_POSIX)
michael@0: void CommandLine::AppendSwitch(const std::wstring& switch_string) {
michael@0:   std::string ascii_switch = WideToASCII(switch_string);
michael@0:   argv_.push_back(kSwitchPrefixes[0] + ascii_switch);
michael@0:   switches_[ascii_switch] = "";
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendSwitchWithValue(const std::wstring& switch_string,
michael@0:                                         const std::wstring& value_string) {
michael@0:   std::string ascii_switch = WideToASCII(switch_string);
michael@0:   std::string ascii_value = WideToASCII(value_string);
michael@0: 
michael@0:   argv_.push_back(kSwitchPrefixes[0] + ascii_switch +
michael@0:                   kSwitchValueSeparator + ascii_value);
michael@0:   switches_[ascii_switch] = ascii_value;
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendLooseValue(const std::wstring& value) {
michael@0:   argv_.push_back(WideToASCII(value));
michael@0: }
michael@0: 
michael@0: void CommandLine::AppendArguments(const CommandLine& other,
michael@0:                                   bool include_program) {
michael@0:   // Verify include_program is used correctly.
michael@0:   // Logic could be shorter but this is clearer.
michael@0:   DCHECK(include_program ? !other.program().empty() : other.program().empty());
michael@0: 
michael@0:   size_t first_arg = include_program ? 0 : 1;
michael@0:   for (size_t i = first_arg; i < other.argv_.size(); ++i)
michael@0:     argv_.push_back(other.argv_[i]);
michael@0:   std::map<std::string, StringType>::const_iterator i;
michael@0:   for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
michael@0:     switches_[i->first] = i->second;
michael@0: }
michael@0: 
michael@0: void CommandLine::PrependWrapper(const std::wstring& wrapper_wide) {
michael@0:   // The wrapper may have embedded arguments (like "gdb --args"). In this case,
michael@0:   // we don't pretend to do anything fancy, we just split on spaces.
michael@0:   const std::string wrapper = WideToASCII(wrapper_wide);
michael@0:   std::vector<std::string> wrapper_and_args;
michael@0:   SplitString(wrapper, ' ', &wrapper_and_args);
michael@0:   argv_.insert(argv_.begin(), wrapper_and_args.begin(), wrapper_and_args.end());
michael@0: }
michael@0: 
michael@0: #endif