Harry Cutts | 4440292 | 2022-10-19 17:42:27 +0000 | [diff] [blame] | 1 | // Copyright 2014 The ChromiumOS Authors |
Michael Spang | 2b1a8fc | 2014-04-04 13:29:13 -0400 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Harry Cutts | 2cb5dba | 2022-10-19 17:25:54 +0000 | [diff] [blame] | 5 | #include "include/command_line.h" |
Michael Spang | 2b1a8fc | 2014-04-04 13:29:13 -0400 | [diff] [blame] | 6 | |
| 7 | #include <algorithm> |
| 8 | #include <ostream> |
| 9 | #include <string> |
| 10 | |
Harry Cutts | 2cb5dba | 2022-10-19 17:25:54 +0000 | [diff] [blame] | 11 | #include "include/macros.h" |
| 12 | #include "include/string_util.h" |
Michael Spang | 2b1a8fc | 2014-04-04 13:29:13 -0400 | [diff] [blame] | 13 | |
| 14 | namespace gestures { |
| 15 | |
Harry Cutts | 91d989b | 2023-06-02 15:38:45 +0000 | [diff] [blame] | 16 | CommandLine* CommandLine::current_process_commandline_ = nullptr; |
Michael Spang | 2b1a8fc | 2014-04-04 13:29:13 -0400 | [diff] [blame] | 17 | |
| 18 | namespace { |
| 19 | |
| 20 | const CommandLine::CharType kSwitchTerminator[] = "--"; |
| 21 | const CommandLine::CharType kSwitchValueSeparator[] = "="; |
| 22 | |
| 23 | // Since we use a lazy match, make sure that longer versions (like "--") are |
| 24 | // listed before shorter versions (like "-") of similar prefixes. |
| 25 | // Unixes don't use slash as a switch. |
| 26 | const CommandLine::CharType* const kSwitchPrefixes[] = {"--", "-"}; |
| 27 | size_t switch_prefix_count = arraysize(kSwitchPrefixes); |
| 28 | |
| 29 | size_t GetSwitchPrefixLength(const std::string& string) { |
| 30 | for (size_t i = 0; i < switch_prefix_count; ++i) { |
| 31 | std::string prefix(kSwitchPrefixes[i]); |
| 32 | if (string.compare(0, prefix.length(), prefix) == 0) |
| 33 | return prefix.length(); |
| 34 | } |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | // Fills in |switch_string| and |switch_value| if |string| is a switch. |
| 39 | // This will preserve the input switch prefix in the output |switch_string|. |
| 40 | bool IsSwitch(const std::string& string, |
| 41 | std::string* switch_string, |
| 42 | std::string* switch_value) { |
| 43 | switch_string->clear(); |
| 44 | switch_value->clear(); |
| 45 | size_t prefix_length = GetSwitchPrefixLength(string); |
| 46 | if (prefix_length == 0 || prefix_length == string.length()) |
| 47 | return false; |
| 48 | |
| 49 | const size_t equals_position = string.find(kSwitchValueSeparator); |
| 50 | *switch_string = string.substr(0, equals_position); |
| 51 | if (equals_position != std::string::npos) |
| 52 | *switch_value = string.substr(equals_position + 1); |
| 53 | return true; |
| 54 | } |
| 55 | |
| 56 | // Append switches and arguments, keeping switches before arguments. |
| 57 | void AppendSwitchesAndArguments(CommandLine& command_line, |
| 58 | const CommandLine::StringVector& argv) { |
| 59 | bool parse_switches = true; |
| 60 | for (size_t i = 1; i < argv.size(); ++i) { |
| 61 | std::string arg = argv[i]; |
| 62 | TrimWhitespaceASCII(arg, TRIM_ALL, &arg); |
| 63 | |
| 64 | std::string switch_string; |
| 65 | std::string switch_value; |
| 66 | parse_switches &= (arg != kSwitchTerminator); |
| 67 | if (parse_switches && IsSwitch(arg, &switch_string, &switch_value)) { |
| 68 | command_line.AppendSwitchASCII(switch_string, switch_value); |
| 69 | } else { |
| 70 | command_line.AppendArgASCII(arg); |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | } // namespace |
| 76 | |
| 77 | CommandLine::CommandLine() |
| 78 | : argv_(1), |
| 79 | begin_args_(1) {} |
| 80 | |
| 81 | CommandLine::~CommandLine() {} |
| 82 | |
| 83 | // static |
| 84 | bool CommandLine::Init(int argc, const char* const* argv) { |
| 85 | if (current_process_commandline_) { |
| 86 | // If this is intentional, Reset() must be called first. If we are using |
| 87 | // the shared build mode, we have to share a single object across multiple |
| 88 | // shared libraries. |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | current_process_commandline_ = new CommandLine(); |
| 93 | current_process_commandline_->InitFromArgv(argc, argv); |
| 94 | return true; |
| 95 | } |
| 96 | |
| 97 | // static |
| 98 | void CommandLine::Reset() { |
| 99 | delete current_process_commandline_; |
Harry Cutts | 91d989b | 2023-06-02 15:38:45 +0000 | [diff] [blame] | 100 | current_process_commandline_ = nullptr; |
Michael Spang | 2b1a8fc | 2014-04-04 13:29:13 -0400 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | // static |
| 104 | CommandLine* CommandLine::ForCurrentProcess() { |
| 105 | if (!current_process_commandline_) { |
| 106 | fprintf(stderr, "FATAL: Command line not initialized!\n"); |
| 107 | abort(); |
| 108 | } |
| 109 | return current_process_commandline_; |
| 110 | } |
| 111 | |
| 112 | |
| 113 | void CommandLine::InitFromArgv(int argc, |
| 114 | const CommandLine::CharType* const* argv) { |
| 115 | StringVector new_argv; |
| 116 | for (int i = 0; i < argc; ++i) |
| 117 | new_argv.push_back(argv[i]); |
| 118 | InitFromArgv(new_argv); |
| 119 | } |
| 120 | |
| 121 | void CommandLine::InitFromArgv(const StringVector& argv) { |
| 122 | argv_ = StringVector(1); |
| 123 | switches_.clear(); |
| 124 | begin_args_ = 1; |
| 125 | SetProgram(argv.empty() ? "" : argv[0]); |
| 126 | AppendSwitchesAndArguments(*this, argv); |
| 127 | } |
| 128 | |
| 129 | std::string CommandLine::GetProgram() const { |
| 130 | return argv_[0]; |
| 131 | } |
| 132 | |
| 133 | void CommandLine::SetProgram(const std::string& program) { |
| 134 | TrimWhitespaceASCII(program, TRIM_ALL, &argv_[0]); |
| 135 | } |
| 136 | |
| 137 | bool CommandLine::HasSwitch(const std::string& switch_string) const { |
| 138 | return switches_.find(switch_string) != switches_.end(); |
| 139 | } |
| 140 | |
| 141 | std::string CommandLine::GetSwitchValueASCII( |
| 142 | const std::string& switch_string) const { |
| 143 | SwitchMap::const_iterator result = |
| 144 | switches_.find(switch_string); |
| 145 | return result == switches_.end() ? std::string() : result->second; |
| 146 | } |
| 147 | |
| 148 | void CommandLine::AppendSwitch(const std::string& switch_string) { |
| 149 | AppendSwitchASCII(switch_string, std::string()); |
| 150 | } |
| 151 | |
| 152 | void CommandLine::AppendSwitchASCII(const std::string& switch_string, |
| 153 | const std::string& value) { |
| 154 | std::string switch_key(switch_string); |
| 155 | std::string combined_switch_string(switch_string); |
| 156 | size_t prefix_length = GetSwitchPrefixLength(combined_switch_string); |
| 157 | switches_[switch_key.substr(prefix_length)] = value; |
| 158 | // Preserve existing switch prefixes in |argv_|; only append one if necessary. |
| 159 | if (prefix_length == 0) |
| 160 | combined_switch_string = kSwitchPrefixes[0] + combined_switch_string; |
| 161 | if (!value.empty()) |
| 162 | combined_switch_string += kSwitchValueSeparator + value; |
| 163 | // Append the switch and update the switches/arguments divider |begin_args_|. |
| 164 | argv_.insert(argv_.begin() + begin_args_++, combined_switch_string); |
| 165 | } |
| 166 | |
| 167 | CommandLine::StringVector CommandLine::GetArgs() const { |
| 168 | // Gather all arguments after the last switch (may include kSwitchTerminator). |
| 169 | StringVector args(argv_.begin() + begin_args_, argv_.end()); |
| 170 | // Erase only the first kSwitchTerminator (maybe "--" is a legitimate page?) |
| 171 | StringVector::iterator switch_terminator = |
| 172 | std::find(args.begin(), args.end(), kSwitchTerminator); |
| 173 | if (switch_terminator != args.end()) |
| 174 | args.erase(switch_terminator); |
| 175 | return args; |
| 176 | } |
| 177 | |
| 178 | void CommandLine::AppendArgASCII(const std::string& value) { |
| 179 | argv_.push_back(value); |
| 180 | } |
| 181 | |
| 182 | } // namespace gestures |