Reorganize CommandLine code.

base/command_line.cc

 // 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.
 
 #include "base/command_line.h"
 
 #include <algorithm>
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/singleton.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #elif defined(OS_POSIX)
 #include <limits.h>
 #include <stdlib.h>
 #include <unistd.h>
 #endif
 
 CommandLine* CommandLine::current_process_commandline_ = NULL;
 
-// Since we use a lazy match, make sure that longer versions (like L"--")
-// are listed before shorter versions (like L"-") of similar prefixes.
+namespace {
+typedef CommandLine::StringType::value_type CharType;
+
+const CharType kSwitchTerminator[] = FILE_PATH_LITERAL("--");
+const CharType kSwitchValueSeparator[] = FILE_PATH_LITERAL("=");
+// Since we use a lazy match, make sure that longer versions (like "--") are
+// listed before shorter versions (like "-") of similar prefixes.
 #if defined(OS_WIN)
-const wchar_t* const kSwitchPrefixes[] = {L"--", L"-", L"/"};
-const wchar_t kSwitchTerminator[] = L"--";
-const wchar_t kSwitchValueSeparator[] = L"=";
+const CharType* const kSwitchPrefixes[] = {L"--", L"-", L"/"};
 #elif defined(OS_POSIX)
 // Unixes don't use slash as a switch.
-const char* const kSwitchPrefixes[] = {"--", "-"};
-const char kSwitchTerminator[] = "--";
-const char kSwitchValueSeparator[] = "=";
+const CharType* const kSwitchPrefixes[] = {"--", "-"};
 #endif
 
 #if defined(OS_WIN)
-namespace {
-// Lowercase a string.  This is used to lowercase switch names.
-// Is this what we really want?  It seems crazy to me.  I've left it in
-// for backwards compatibility on Windows.
-void Lowercase(std::string* parameter) {
-  transform(parameter->begin(), parameter->end(), parameter->begin(),
-            tolower);
+// Lowercase a string for case-insensitivity of switches.
+// Is this desirable? It exists for backwards compatibility on Windows.
+void Lowercase(std::string* arg) {
+  transform(arg->begin(), arg->end(), arg->begin(), tolower);
 }
 
-// Quote a string if necessary, such that CommandLineToArgvW() will
-// always process it as a single argument.
-std::wstring WindowsStyleQuote(const std::wstring& arg) {
+// Quote a string if necessary, such that CommandLineToArgvW() will always
+// process it as a single argument.
+CommandLine::StringType WindowsStyleQuote(const CommandLine::StringType& arg) {
   // We follow the quoting rules of CommandLineToArgvW.
   // http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
-  if (arg.find_first_of(L" \\\"") == std::wstring::npos) {
+  if (arg.find_first_of(L" \\\"") == CommandLine::StringType::npos) {
     // No quoting necessary.
     return arg;
   }
 
-  std::wstring out;
+  CommandLine::StringType out;
   out.push_back(L'"');
   for (size_t i = 0; i < arg.size(); ++i) {
     if (arg[i] == '\\') {
       // Find the extent of this run of backslashes.
       size_t start = i, end = start + 1;
       for (; end < arg.size() && arg[end] == '\\'; ++end)
         /* empty */;
       size_t backslash_count = end - start;
 
       // Backslashes are escapes only if the run is followed by a double quote.
@@ skipping 12 matching lines @@
       out.push_back('\\');
       out.push_back('"');
     } else {
       out.push_back(arg[i]);
     }
   }
   out.push_back('"');
 
   return out;
 }
-}  // namespace
 #endif
 
-CommandLine::~CommandLine() {
+// Returns true and fills in |switch_string| and |switch_value| if
+// |parameter_string| represents a switch.
+bool IsSwitch(const CommandLine::StringType& parameter_string,
+              std::string* switch_string,
+              CommandLine::StringType* switch_value) {
+  switch_string->clear();
+  switch_value->clear();
+
+  for (size_t i = 0; i < arraysize(kSwitchPrefixes); ++i) {
+    CommandLine::StringType prefix(kSwitchPrefixes[i]);
+    if (parameter_string.find(prefix) != 0)
+      continue;
+
+    const size_t switch_start = prefix.length();
+    const size_t equals_position = parameter_string.find(
+        kSwitchValueSeparator, switch_start);
+    CommandLine::StringType switch_native;
+    if (equals_position == CommandLine::StringType::npos) {
+      switch_native = parameter_string.substr(switch_start);
+    } else {
+      switch_native = parameter_string.substr(
+          switch_start, equals_position - switch_start);
+      *switch_value = parameter_string.substr(equals_position + 1);
+    }
+#if defined(OS_WIN)
+    *switch_string = WideToASCII(switch_native);
+    Lowercase(switch_string);
+#else
+    *switch_string = switch_native;
+#endif
+
+    return true;
+  }
+
+  return false;
 }
 
-#if defined(OS_WIN)
+}  // namespace
+
 CommandLine::CommandLine(NoProgram no_program) {
-}
-
-void CommandLine::ParseFromString(const std::wstring& command_line) {
-  TrimWhitespace(command_line, TRIM_ALL, &command_line_string_);
-
-  if (command_line_string_.empty())
-    return;
-
-  int num_args = 0;
-  wchar_t** args = NULL;
-
-  args = CommandLineToArgvW(command_line_string_.c_str(), &num_args);
-
-  // Populate program_ with the trimmed version of the first arg.
-  TrimWhitespace(args[0], TRIM_ALL, &program_);
-
-  bool parse_switches = true;
-  for (int i = 1; i < num_args; ++i) {
-    std::wstring arg;
-    TrimWhitespace(args[i], TRIM_ALL, &arg);
-
-    if (!parse_switches) {
-      args_.push_back(arg);
-      continue;
-    }
-
-    if (arg == kSwitchTerminator) {
-      parse_switches = false;
-      continue;
-    }
-
-    std::string switch_string;
-    std::wstring switch_value;
-    if (IsSwitch(arg, &switch_string, &switch_value)) {
-      switches_[switch_string] = switch_value;
-    } else {
-      args_.push_back(arg);
-    }
-  }
-
-  if (args)
-    LocalFree(args);
-}
-
-// static
-CommandLine CommandLine::FromString(const std::wstring& command_line) {
-  CommandLine cmd;
-  cmd.ParseFromString(command_line);
-  return cmd;
+#if defined(OS_POSIX)
+  // Push an empty argument, because we always assume argv_[0] is a program.
+  argv_.push_back("");
+#endif
 }
 
 CommandLine::CommandLine(const FilePath& program) {
+#if defined(OS_WIN)
   if (!program.empty()) {
     program_ = program.value();
     // TODO(evanm): proper quoting here.
     command_line_string_ = L'"' + program.value() + L'"';
   }
+#elif defined(OS_POSIX)
+  argv_.push_back(program.value());
+#endif
 }
 
-#elif defined(OS_POSIX)
-CommandLine::CommandLine(NoProgram no_program) {
-  // Push an empty argument, because we always assume argv_[0] is a program.
-  argv_.push_back("");
-}
-
+#if defined(OS_POSIX)
 CommandLine::CommandLine(int argc, const char* const* argv) {
   InitFromArgv(argc, argv);
 }
 
-CommandLine::CommandLine(const std::vector<std::string>& argv) {
+CommandLine::CommandLine(const StringVector& argv) {
   InitFromArgv(argv);
 }
+#endif  // OS_POSIX
 
+// static
+void CommandLine::Init(int argc, const char* const* argv) {
+  delete current_process_commandline_;
+  current_process_commandline_ = new CommandLine;
+#if defined(OS_WIN)
+  current_process_commandline_->ParseFromString(::GetCommandLineW());
+#elif defined(OS_POSIX)
+  current_process_commandline_->InitFromArgv(argc, argv);
+#endif
+}
+
+// static
+void CommandLine::Reset() {
+  DCHECK(current_process_commandline_);
+  delete current_process_commandline_;
+  current_process_commandline_ = NULL;
+}
+
+// static
+CommandLine* CommandLine::ForCurrentProcess() {
+  DCHECK(current_process_commandline_);
+  return current_process_commandline_;
+}
+
+#if defined(OS_WIN)
+// static
+CommandLine CommandLine::FromString(
+    const CommandLine::StringType& command_line) {
+  CommandLine cmd;
+  cmd.ParseFromString(command_line);
+  return cmd;
+}
+#endif  // OS_WIN
+
+#if defined(OS_POSIX)
 void CommandLine::InitFromArgv(int argc, const char* const* argv) {
   for (int i = 0; i < argc; ++i)
     argv_.push_back(argv[i]);
   InitFromArgv(argv_);
 }
 
-void CommandLine::InitFromArgv(const std::vector<std::string>& argv) {
+void CommandLine::InitFromArgv(const StringVector& argv) {
   argv_ = argv;
   bool parse_switches = true;
   for (size_t i = 1; i < argv_.size(); ++i) {
     const std::string& arg = argv_[i];
 
     if (!parse_switches) {
       args_.push_back(arg);
       continue;
     }
 
     if (arg == kSwitchTerminator) {
       parse_switches = false;
       continue;
     }
 
     std::string switch_string;
-    std::string switch_value;
+    StringType switch_value;
     if (IsSwitch(arg, &switch_string, &switch_value)) {
       switches_[switch_string] = switch_value;
     } else {
       args_.push_back(arg);
     }
   }
 }
+#endif  // OS_POSIX
 
-CommandLine::CommandLine(const FilePath& program) {
-  argv_.push_back(program.value());
-}
-
-#endif
-
-// static
-bool CommandLine::IsSwitch(const StringType& parameter_string,
-                           std::string* switch_string,
-                           StringType* switch_value) {
-  switch_string->clear();
-  switch_value->clear();
-
-  for (size_t i = 0; i < arraysize(kSwitchPrefixes); ++i) {
-    StringType prefix(kSwitchPrefixes[i]);
-    if (parameter_string.find(prefix) != 0)
-      continue;
-
-    const size_t switch_start = prefix.length();
-    const size_t equals_position = parameter_string.find(
-        kSwitchValueSeparator, switch_start);
-    StringType switch_native;
-    if (equals_position == StringType::npos) {
-      switch_native = parameter_string.substr(switch_start);
-    } else {
-      switch_native = parameter_string.substr(
-          switch_start, equals_position - switch_start);
-      *switch_value = parameter_string.substr(equals_position + 1);
-    }
+CommandLine::StringType CommandLine::command_line_string() const {
 #if defined(OS_WIN)
-    *switch_string = WideToASCII(switch_native);
-    Lowercase(switch_string);
-#else
-    *switch_string = switch_native;
-#endif
-
-    return true;
-  }
-
-  return false;
-}
-
-// static
-void CommandLine::Init(int argc, const char* const* argv) {
-  delete current_process_commandline_;
-  current_process_commandline_ = new CommandLine;
-#if defined(OS_WIN)
-  current_process_commandline_->ParseFromString(::GetCommandLineW());
+  return command_line_string_;
 #elif defined(OS_POSIX)
-  current_process_commandline_->InitFromArgv(argc, argv);
+  return JoinString(argv_, ' ');
 #endif
 }
 
-void CommandLine::Reset() {
-  DCHECK(current_process_commandline_ != NULL);
-  delete current_process_commandline_;
-  current_process_commandline_ = NULL;
-}
-
-// static
-CommandLine* CommandLine::ForCurrentProcess() {
-  DCHECK(current_process_commandline_);
-  return current_process_commandline_;
+FilePath CommandLine::GetProgram() const {
+#if defined(OS_WIN)
+  return FilePath(program_);
+#else
+  DCHECK_GT(argv_.size(), 0U);
+  return FilePath(argv_[0]);
+#endif
 }
 
 bool CommandLine::HasSwitch(const std::string& switch_string) const {
   std::string lowercased_switch(switch_string);
 #if defined(OS_WIN)
   Lowercase(&lowercased_switch);
 #endif
   return switches_.find(lowercased_switch) != switches_.end();
 }
 
@@ skipping 16 matching lines @@
   return FilePath(GetSwitchValueNative(switch_string));
 }
 
 CommandLine::StringType CommandLine::GetSwitchValueNative(
     const std::string& switch_string) const {
   std::string lowercased_switch(switch_string);
 #if defined(OS_WIN)
   Lowercase(&lowercased_switch);
 #endif
 
-  std::map<std::string, StringType>::const_iterator result =
-      switches_.find(lowercased_switch);
+  SwitchMap::const_iterator result = switches_.find(lowercased_switch);
 
   if (result == switches_.end()) {
     return CommandLine::StringType();
   } else {
     return result->second;
   }
 }
 
-FilePath CommandLine::GetProgram() const {
+size_t CommandLine::GetSwitchCount() const {
+  return switches_.size();
+}
+
+void CommandLine::AppendSwitch(const std::string& switch_string) {
 #if defined(OS_WIN)
-  return FilePath(program_);
-#else
-  DCHECK_GT(argv_.size(), 0U);
-  return FilePath(argv_[0]);
+  command_line_string_.append(L" ");
+  command_line_string_.append(kSwitchPrefixes[0] + ASCIIToWide(switch_string));
+  switches_[switch_string] = L"";
+#elif defined(OS_POSIX)
+  argv_.push_back(kSwitchPrefixes[0] + switch_string);
+  switches_[switch_string] = "";
 #endif
 }
 
-#if defined(OS_POSIX)
-std::string CommandLine::command_line_string() const {
-  return JoinString(argv_, ' ');
-}
-#endif
-
-#if defined(OS_WIN)
-void CommandLine::AppendSwitch(const std::string& switch_string) {
-  command_line_string_.append(L" ");
-  command_line_string_.append(kSwitchPrefixes[0] + ASCIIToWide(switch_string));
-  switches_[switch_string] = L"";
+void CommandLine::AppendSwitchPath(const std::string& switch_string,
+                                   const FilePath& path) {
+  AppendSwitchNative(switch_string, path.value());
 }
 
 void CommandLine::AppendSwitchNative(const std::string& switch_string,
-                                     const std::wstring& value) {
-  std::wstring combined_switch_string =
+                                     const CommandLine::StringType& value) {
+#if defined(OS_WIN)
+  StringType combined_switch_string =
       kSwitchPrefixes[0] + ASCIIToWide(switch_string);
   if (!value.empty())
     combined_switch_string += kSwitchValueSeparator + WindowsStyleQuote(value);
 
   command_line_string_.append(L" ");
   command_line_string_.append(combined_switch_string);
 
   switches_[switch_string] = value;
+#elif defined(OS_POSIX)
+  StringType combined_switch_string = kSwitchPrefixes[0] + switch_string;
+  if (!value.empty())
+    combined_switch_string += kSwitchValueSeparator + value;
+  argv_.push_back(combined_switch_string);
+  switches_[switch_string] = value;
+#endif
 }
 
 void CommandLine::AppendSwitchASCII(const std::string& switch_string,
                                     const std::string& value_string) {
+#if defined(OS_WIN)
   AppendSwitchNative(switch_string, ASCIIToWide(value_string));
+#elif defined(OS_POSIX)
+  AppendSwitchNative(switch_string, value_string);
+#endif
+}
+
+void CommandLine::AppendSwitches(const CommandLine& other) {
+  SwitchMap::const_iterator i;
+  for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
+    AppendSwitchNative(i->first, i->second);
+}
+
+void CommandLine::CopySwitchesFrom(const CommandLine& source,
+                                   const char* const switches[],
+                                   size_t count) {
+  for (size_t i = 0; i < count; ++i) {
+    if (source.HasSwitch(switches[i])) {
+      StringType value = source.GetSwitchValueNative(switches[i]);
+      AppendSwitchNative(switches[i], value);
+    }
+  }
 }
 
 void CommandLine::AppendArg(const std::string& value) {
+#if defined(OS_WIN)
   DCHECK(IsStringUTF8(value));
   AppendArgNative(UTF8ToWide(value));
+#elif defined(OS_POSIX)
+  AppendArgNative(value);
+#endif
 }
 
-void CommandLine::AppendArgNative(const std::wstring& value) {
+void CommandLine::AppendArgPath(const FilePath& path) {
+  AppendArgNative(path.value());
+}
+
+void CommandLine::AppendArgNative(const CommandLine::StringType& value) {
+#if defined(OS_WIN)
   command_line_string_.append(L" ");
   command_line_string_.append(WindowsStyleQuote(value));
   args_.push_back(value);
+#elif defined(OS_POSIX)
+  DCHECK(IsStringUTF8(value));
+  argv_.push_back(value);
+#endif
+}
+
+void CommandLine::AppendArgs(const CommandLine& other) {
+  if(other.args_.size() <= 0)
+    return;
+#if defined(OS_WIN)
+  command_line_string_.append(L" --");
+#endif  // OS_WIN
+  StringVector::const_iterator i;
+  for (i = other.args_.begin(); i != other.args_.end(); ++i)
+    AppendArgNative(*i);
 }
 
 void CommandLine::AppendArguments(const CommandLine& other,
                                   bool include_program) {
+#if defined(OS_WIN)
   // Verify include_program is used correctly.
   DCHECK(!include_program || !other.GetProgram().empty());
   if (include_program)
     program_ = other.program_;
 
   if (!command_line_string_.empty())
     command_line_string_ += L' ';
 
   command_line_string_ += other.command_line_string_;
-
-  std::map<std::string, StringType>::const_iterator i;
-  for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
-    switches_[i->first] = i->second;
-}
-
-void CommandLine::PrependWrapper(const std::wstring& wrapper) {
-  if (wrapper.empty())
-    return;
-  // The wrapper may have embedded arguments (like "gdb --args"). In this case,
-  // we don't pretend to do anything fancy, we just split on spaces.
-  std::vector<std::wstring> wrapper_and_args;
-  base::SplitString(wrapper, ' ', &wrapper_and_args);
-  program_ = wrapper_and_args[0];
-  command_line_string_ = wrapper + L" " + command_line_string_;
-}
-
 #elif defined(OS_POSIX)
-void CommandLine::AppendSwitch(const std::string& switch_string) {
-  argv_.push_back(kSwitchPrefixes[0] + switch_string);
-  switches_[switch_string] = "";
-}
-
-void CommandLine::AppendSwitchNative(const std::string& switch_string,
-                                     const std::string& value) {
-  std::string combined_switch_string = kSwitchPrefixes[0] + switch_string;
-  if (!value.empty())
-    combined_switch_string += kSwitchValueSeparator + value;
-  argv_.push_back(combined_switch_string);
-  switches_[switch_string] = value;
-}
-
-void CommandLine::AppendSwitchASCII(const std::string& switch_string,
-                                    const std::string& value_string) {
-  AppendSwitchNative(switch_string, value_string);
-}
-
-void CommandLine::AppendArg(const std::string& value) {
-  AppendArgNative(value);
-}
-
-void CommandLine::AppendArgNative(const std::string& value) {
-  DCHECK(IsStringUTF8(value));
-  argv_.push_back(value);
-}
-
-void CommandLine::AppendArguments(const CommandLine& other,
-                                  bool include_program) {
   // Verify include_program is used correctly.
   // Logic could be shorter but this is clearer.
   DCHECK_EQ(include_program, !other.GetProgram().empty());
 
   if (include_program)
     argv_[0] = other.argv_[0];
 
   // Skip the first arg when copying since it's the program but push all
   // arguments to our arg vector.
   for (size_t i = 1; i < other.argv_.size(); ++i)
     argv_.push_back(other.argv_[i]);
+#endif
 
-  std::map<std::string, StringType>::const_iterator i;
+  SwitchMap::const_iterator i;
   for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
     switches_[i->first] = i->second;
 }
 
-void CommandLine::PrependWrapper(const std::string& wrapper) {
+void CommandLine::PrependWrapper(const CommandLine::StringType& wrapper) {
   // The wrapper may have embedded arguments (like "gdb --args"). In this case,
   // we don't pretend to do anything fancy, we just split on spaces.
-  std::vector<std::string> wrapper_and_args;
+  if (wrapper.empty())
+    return;
+  StringVector wrapper_and_args;
+#if defined(OS_WIN)
+  base::SplitString(wrapper, ' ', &wrapper_and_args);
+  program_ = wrapper_and_args[0];
+  command_line_string_ = wrapper + L" " + command_line_string_;
+#elif defined(OS_POSIX)
   base::SplitString(wrapper, ' ', &wrapper_and_args);
   argv_.insert(argv_.begin(), wrapper_and_args.begin(), wrapper_and_args.end());
+#endif
 }
 
-#endif
+#if defined(OS_WIN)
+void CommandLine::ParseFromString(const CommandLine::StringType& command_line) {
+  TrimWhitespace(command_line, TRIM_ALL, &command_line_string_);
 
-void CommandLine::AppendSwitchPath(const std::string& switch_string,
-                                   const FilePath& path) {
-  AppendSwitchNative(switch_string, path.value());
-}
-
-void CommandLine::AppendSwitches(const CommandLine& other) {
-  std::map<std::string, StringType>::const_iterator i;
-  for (i = other.switches_.begin(); i != other.switches_.end(); ++i)
-    AppendSwitchNative(i->first, i->second);
-}
-
-void CommandLine::AppendArgPath(const FilePath& path) {
-  AppendArgNative(path.value());
-}
-
-void CommandLine::AppendArgs(const CommandLine& other) {
-  if(other.args_.size() <= 0)
+  if (command_line_string_.empty())
     return;
 
-#if defined(OS_WIN)
-  command_line_string_.append(L" --");
-#endif  // OS_WIN
-  std::vector<StringType>::const_iterator i;
-  for (i = other.args_.begin(); i != other.args_.end(); ++i)
-    AppendArgNative(*i);
-}
+  int num_args = 0;
+  wchar_t** args = NULL;
 
-void CommandLine::CopySwitchesFrom(const CommandLine& source,
-                                   const char* const switches[],
-                                   size_t count) {
-  for (size_t i = 0; i < count; ++i) {
-    if (source.HasSwitch(switches[i])) {
-      StringType value = source.GetSwitchValueNative(switches[i]);
-      AppendSwitchNative(switches[i], value);
+  args = CommandLineToArgvW(command_line_string_.c_str(), &num_args);
+
+  // Populate program_ with the trimmed version of the first arg.
+  TrimWhitespace(args[0], TRIM_ALL, &program_);
+
+  bool parse_switches = true;
+  for (int i = 1; i < num_args; ++i) {
+    StringType arg;
+    TrimWhitespace(args[i], TRIM_ALL, &arg);
+
+    if (!parse_switches) {
+      args_.push_back(arg);
+      continue;
+    }
+
+    if (arg == kSwitchTerminator) {
+      parse_switches = false;
+      continue;
+    }
+
+    std::string switch_string;
+    StringType switch_value;
+    if (IsSwitch(arg, &switch_string, &switch_value)) {
+      switches_[switch_string] = switch_value;
+    } else {
+      args_.push_back(arg);
     }
   }
+
+  if (args)
+    LocalFree(args);
 }
-
-// private
-CommandLine::CommandLine() {
-}
-
-// static
-CommandLine* CommandLine::ForCurrentProcessMutable() {
-  DCHECK(current_process_commandline_);
-  return current_process_commandline_;
-}
+#endif