/src/WasmEdge/lib/po/argument_parser.cpp

Source
// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

#include "po/argument_parser.h"
#include "common/defines.h"
#include "common/spdlog.h"
#include "system/winapi.h"
#include <cstdio>

namespace WasmEdge {
namespace PO {

cxx20::expected<bool, Error> ArgumentParser::SubCommandDescriptor::parse(
    std::FILE *Out, Span<const char *> ProgramNamePrefix, int Argc,
    const char *Argv[], int ArgP, const bool &VersionOpt) noexcept {
  ProgramNames.reserve(ProgramNamePrefix.size() + 1);
  ProgramNames.assign(ProgramNamePrefix.begin(), ProgramNamePrefix.end());
  if (ArgP < Argc) {
    ProgramNames.push_back(Argv[ArgP]);
  }
  ArgumentDescriptor *CurrentDesc = nullptr;
  bool FirstNonOption = true;
  bool Escaped = false;
  auto PositionalIter = PositionalList.cbegin();
  for (int ArgI = ArgP + 1; ArgI < Argc; ++ArgI) {
    std::string_view Arg = Argv[ArgI];
    if (!Escaped && Arg.size() >= 2 && Arg[0] == '-') {
      if (Arg[1] == '-') {
        if (Arg.size() == 2) {
          Escaped = true;
        } else {
          // long option
          if (CurrentDesc && CurrentDesc->nargs() == 0) {
            CurrentDesc->default_value();
          }
          if (auto Res = consume_long_option_with_argument(Arg); !Res) {
            return cxx20::unexpected(Res.error());
          } else {
            CurrentDesc = *Res;
          }
        }
      } else {
        // short options
        if (CurrentDesc && CurrentDesc->nargs() == 0) {
          CurrentDesc->default_value();
        }
        if (auto Res = consume_short_options(Arg); !Res) {
          return cxx20::unexpected(Res.error());
        } else {
          CurrentDesc = *Res;
        }
      }
    } else if (!Escaped && CurrentDesc) {
      if (auto Res = consume_argument(*CurrentDesc, Arg); !Res) {
        return cxx20::unexpected(Res.error());
      }
      CurrentDesc = nullptr;
    } else {
      // no more options
      if (FirstNonOption) {
        FirstNonOption = false;
        if (!SubCommandMap.empty()) {
          if (auto Iter = SubCommandMap.find(Arg);
              Iter != SubCommandMap.end()) {
            auto &Child = this[Iter->second];
            Child.SC->select();
            return Child.parse(Out, ProgramNames, Argc, Argv, ArgI, VersionOpt);
          }
        }
      }
      Escaped = true;
      if (CurrentDesc) {
        if (auto Res = consume_argument(*CurrentDesc, Arg); !Res) {
          return cxx20::unexpected(Res.error());
        } else {
          CurrentDesc = *Res;
        }
      } else {
        if (PositionalIter == PositionalList.cend()) {
          return cxx20::unexpected<Error>(
              std::in_place, ErrCode::InvalidArgument,
              "positional argument exceeds maximum consuming."s);
        }
        if (auto Res =
                consume_argument(ArgumentDescriptors[*PositionalIter], Arg);
            !Res) {
          return cxx20::unexpected(Res.error());
        } else {
          CurrentDesc = *Res;
        }
        ++PositionalIter;
      }
    }
  }
  if (CurrentDesc && CurrentDesc->nargs() == 0) {
    CurrentDesc->default_value();
  }

  if (VersionOpt) {
    return true;
  }
  if (!HelpOpt->value()) {
    for (const auto &Desc : ArgumentDescriptors) {
      if (Desc.nargs() < Desc.min_nargs()) {
        help(Out);
        return false;
      }
    }
  } else {
    help(Out);
    return true;
  }
  return true;
}

void ArgumentParser::SubCommandDescriptor::usage(
    std::FILE *Out) const noexcept {
  fmt::print(Out, "{}USAGE{}\n"sv, YELLOW_COLOR, RESET_COLOR);
  for (const char *Part : ProgramNames) {
    fmt::print(Out, "\t{}"sv, Part);
  }
  if (!SubCommandList.empty()) {
    fmt::print(Out, " [SUBCOMMANDS]"sv);
  }
  if (!NonpositionalList.empty()) {
    fmt::print(Out, " [OPTIONS]"sv);
  }
  bool First = true;
  for (const auto &Index : PositionalList) {
    const auto &Desc = ArgumentDescriptors[Index];
    if (Desc.hidden()) {
      continue;
    }

    if (First) {
      fmt::print(Out, " [--]"sv);
      First = false;
    }

    const bool Optional = (Desc.min_nargs() == 0);
    fmt::print(Out, " "sv);
    if (Optional) {
      fmt::print(Out, "["sv);
    }
    switch (ArgumentDescriptors[Index].max_nargs()) {
    case 0:
      break;
    case 1:
      fmt::print(Out, "{}"sv, Desc.meta());
      break;
    default:
      fmt::print(Out, "{} ..."sv, Desc.meta());
      break;
    }
    if (Optional) {
      fmt::print(Out, "]"sv);
    }
  }
  fmt::print(Out, "\n"sv);
}

void ArgumentParser::SubCommandDescriptor::help(std::FILE *Out) const noexcept {
// For enabling Windows PowerShell color support.
#if WASMEDGE_OS_WINDOWS && WINAPI_PARTITION_DESKTOP
  winapi::HANDLE_ OutputHandler =
      winapi::GetStdHandle(winapi::STD_OUTPUT_HANDLE_);
  if (OutputHandler != winapi::INVALID_HANDLE_VALUE_) {
    winapi::DWORD_ ConsoleMode = 0;
    if (winapi::GetConsoleMode(OutputHandler, &ConsoleMode)) {
      ConsoleMode |= winapi::ENABLE_VIRTUAL_TERMINAL_PROCESSING_;
      winapi::SetConsoleMode(OutputHandler, ConsoleMode);
    }
  }
#endif

  usage(Out);
  const constexpr std::string_view kIndent = "\t"sv;

  fmt::print(Out, "\n"sv);
  if (!SubCommandList.empty()) {
    fmt::print(Out, "{}SUBCOMMANDS{}\n"sv, YELLOW_COLOR, RESET_COLOR);
    for (const auto Offset : SubCommandList) {
      fmt::print(Out, "{}{}"sv, kIndent, GREEN_COLOR);
      bool First = true;
      for (const auto &Name : this[Offset].SubCommandNames) {
        if (!First) {
          fmt::print(Out, "|"sv);
        }
        fmt::print(Out, "{}"sv, Name);
        First = false;
      }
      fmt::print(Out, "{}\n"sv, RESET_COLOR);
      indent_output(Out, kIndent, 2, 80, this[Offset].SC->description());
      fmt::print(Out, "\n"sv);
    }
    fmt::print(Out, "\n"sv);
  }

  fmt::print(Out, "{}OPTIONS{}\n"sv, YELLOW_COLOR, RESET_COLOR);
  for (const auto &Index : NonpositionalList) {
    const auto &Desc = ArgumentDescriptors[Index];
    if (Desc.hidden()) {
      continue;
    }

    fmt::print(Out, "{}{}\n"sv, kIndent, GREEN_COLOR);
    bool First = true;
    for (const auto &Option : Desc.options()) {
      if (!First) {
        fmt::print(Out, "|"sv);
      }
      if (Option.size() == 1) {
        fmt::print(Out, "-{}"sv, Option);
      } else {
        fmt::print(Out, "--{}"sv, Option);
      }
      First = false;
    }
    fmt::print(Out, "{}\n"sv, RESET_COLOR);
    indent_output(Out, kIndent, 2, 80, Desc.description());
    fmt::print(Out, "\n"sv);
  }
}

void ArgumentParser::SubCommandDescriptor::indent_output(
    std::FILE *Out, const std::string_view kIndent, std::size_t IndentCount,
    std::size_t ScreenWidth, std::string_view Desc) const noexcept {
  const std::size_t Width = ScreenWidth - kIndent.size() * IndentCount;
  while (Desc.size() > Width) {
    const std::size_t SpacePos = Desc.find_last_of(' ', Width);
    if (SpacePos != std::string_view::npos) {
      for (std::size_t I = 0; I < IndentCount; ++I) {
        fmt::print(Out, "{}"sv, kIndent);
      }
      fmt::print(Out, "{}\n"sv, Desc.substr(0, SpacePos));
      const std::size_t WordPos = Desc.find_first_not_of(' ', SpacePos);
      if (WordPos != std::string_view::npos) {
        Desc = Desc.substr(WordPos);
      } else {
        Desc = {};
      }
    }
  }
  if (!Desc.empty()) {
    for (std::size_t I = 0; I < IndentCount; ++I) {
      fmt::print(Out, "{}"sv, kIndent);
    }
    fmt::print(Out, "{}"sv, Desc);
  }
}

cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
ArgumentParser::SubCommandDescriptor::consume_short_options(
    std::string_view Arg) noexcept {
  ArgumentDescriptor *CurrentDesc = nullptr;
  for (std::size_t I = 1; I < Arg.size(); ++I) {
    if (CurrentDesc && CurrentDesc->nargs() == 0) {
      CurrentDesc->default_value();
    }
    std::string_view Option = Arg.substr(I, 1);
    if (auto Res = consume_short_option(Option); !Res) {
      return cxx20::unexpected(Res.error());
    } else {
      CurrentDesc = *Res;
    }
  }
  return CurrentDesc;
}

cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
ArgumentParser::SubCommandDescriptor::consume_long_option_with_argument(
    std::string_view Arg) noexcept {
  if (auto Pos = Arg.find('=', 2); Pos != std::string_view::npos) {
    // long option with argument
    std::string_view Option = Arg.substr(2, Pos - 2);
    std::string_view Argument = Arg.substr(Pos + 1);
    if (auto Res = consume_long_option(Option); !Res) {
      return cxx20::unexpected<Error>(Res.error());
    } else if (ArgumentDescriptor *CurrentDesc = *Res; !CurrentDesc) {
      return cxx20::unexpected<Error>(
          std::in_place, ErrCode::InvalidArgument,
          fmt::format("option {} doesn't need arguments."sv, Option));
    } else {
      if (auto ConsumeRes = consume_argument(*CurrentDesc, Argument);
          !ConsumeRes) {
        return cxx20::unexpected<Error>(ConsumeRes.error());
      }
      return nullptr;
    }
  } else {
    // long option without argument
    std::string_view Option = Arg.substr(2);
    return consume_long_option(Option);
  }
}

cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
ArgumentParser::SubCommandDescriptor::consume_short_option(
    std::string_view Option) noexcept {
  auto Iter = ArgumentMap.find(Option);
  if (Iter == ArgumentMap.end()) {
    return cxx20::unexpected<Error>(std::in_place, ErrCode::InvalidArgument,
                                    "unknown option: "s + std::string(Option));
  }
  ArgumentDescriptor &CurrentDesc = ArgumentDescriptors[Iter->second];
  if (CurrentDesc.max_nargs() == 0) {
    CurrentDesc.default_value();
    return nullptr;
  }
  return &CurrentDesc;
}

cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
ArgumentParser::SubCommandDescriptor::consume_long_option(
    std::string_view Option) noexcept {
  auto Iter = ArgumentMap.find(Option);
  if (Iter == ArgumentMap.end()) {
    return cxx20::unexpected<Error>(std::in_place, ErrCode::InvalidArgument,
                                    "unknown option: "s + std::string(Option));
  }
  ArgumentDescriptor &CurrentDesc = ArgumentDescriptors[Iter->second];
  if (CurrentDesc.max_nargs() == 0) {
    CurrentDesc.default_value();
    return nullptr;
  }
  return &CurrentDesc;
}

cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
ArgumentParser::SubCommandDescriptor::consume_argument(
    ArgumentDescriptor &CurrentDesc, std::string_view Argument) noexcept {
  if (auto Res = CurrentDesc.argument(std::string(Argument)); !Res) {
    return cxx20::unexpected(Res.error());
  }
  if (++CurrentDesc.nargs() >= CurrentDesc.max_nargs()) {
    return nullptr;
  }
  return &CurrentDesc;
}

bool ArgumentParser::parse(std::FILE *Out, int Argc,
                           const char *Argv[]) noexcept {
  if (auto Res = SubCommandDescriptors.front().parse(Out, {}, Argc, Argv, 0,
                                                     VerOpt.value());
      !Res) {
    fmt::print(Out, "{}\n"sv, Res.error().message());
    return false;
  } else {
    return *Res || VerOpt.value();
  }
}

} // namespace PO
} // namespace WasmEdge

Coverage Report

Created: 2026-09-28 06:22

Line	Count	Source
1		// SPDX-License-Identifier: Apache-2.0
2		// SPDX-FileCopyrightText: Copyright The WasmEdge Authors
3
4		#include "po/argument_parser.h"
5		#include "common/defines.h"
6		#include "common/spdlog.h"
7		#include "system/winapi.h"
8		#include <cstdio>
9
10		namespace WasmEdge {
11		namespace PO {
12
13		cxx20::expected<bool, Error> ArgumentParser::SubCommandDescriptor::parse(
14		std::FILE Out, Span<const char > ProgramNamePrefix, int Argc,
15	1.59k	const char *Argv[], int ArgP, const bool &VersionOpt) noexcept {
16	1.59k	ProgramNames.reserve(ProgramNamePrefix.size() + 1);
17	1.59k	ProgramNames.assign(ProgramNamePrefix.begin(), ProgramNamePrefix.end());
18	1.59k	if (ArgP < Argc) {
19	1.59k	ProgramNames.push_back(Argv[ArgP]);
20	1.59k	}
21	1.59k	ArgumentDescriptor *CurrentDesc = nullptr;
22	1.59k	bool FirstNonOption = true;
23	1.59k	bool Escaped = false;
24	1.59k	auto PositionalIter = PositionalList.cbegin();
25	1.79M	for (int ArgI = ArgP + 1; ArgI < Argc; ++ArgI) {
26	1.79M	std::string_view Arg = Argv[ArgI];
27	1.79M	if (!Escaped && Arg.size() >= 2 && Arg[0] == '-') {
28	348k	if (Arg[1] == '-') {
29	345k	if (Arg.size() == 2) {
30	56	Escaped = true;
31	345k	} else {
32		// long option
33	345k	if (CurrentDesc && CurrentDesc->nargs() == 0) {
34	2.80k	CurrentDesc->default_value();
35	2.80k	}
36	345k	if (auto Res = consume_long_option_with_argument(Arg); !Res) {
37	464	return cxx20::unexpected(Res.error());
38	344k	} else {
39	344k	CurrentDesc = *Res;
40	344k	}
41	345k	}
42	345k	} else {
43		// short options
44	3.42k	if (CurrentDesc && CurrentDesc->nargs() == 0) {
45	492	CurrentDesc->default_value();
46	492	}
47	3.42k	if (auto Res = consume_short_options(Arg); !Res) {
48	41	return cxx20::unexpected(Res.error());
49	3.38k	} else {
50	3.38k	CurrentDesc = *Res;
51	3.38k	}
52	3.42k	}
53	1.44M	} else if (!Escaped && CurrentDesc) {
54	501	if (auto Res = consume_argument(*CurrentDesc, Arg); !Res) {
55	29	return cxx20::unexpected(Res.error());
56	29	}
57	472	CurrentDesc = nullptr;
58	1.44M	} else {
59		// no more options
60	1.44M	if (FirstNonOption) {
61	536	FirstNonOption = false;
62	536	if (!SubCommandMap.empty()) {
63	0	if (auto Iter = SubCommandMap.find(Arg);
64	0	Iter != SubCommandMap.end()) {
65	0	auto &Child = this[Iter->second];
66	0	Child.SC->select();
67	0	return Child.parse(Out, ProgramNames, Argc, Argv, ArgI, VersionOpt);
68	0	}
69	0	}
70	536	}
71	1.44M	Escaped = true;
72	1.44M	if (CurrentDesc) {
73	1.44M	if (auto Res = consume_argument(*CurrentDesc, Arg); !Res) {
74	14	return cxx20::unexpected(Res.error());
75	1.44M	} else {
76	1.44M	CurrentDesc = *Res;
77	1.44M	}
78	1.44M	} else {
79	789	if (PositionalIter == PositionalList.cend()) {
80	0	return cxx20::unexpected<Error>(
81	0	std::in_place, ErrCode::InvalidArgument,
82	0	"positional argument exceeds maximum consuming."s);
83	0	}
84	789	if (auto Res =
85	789	consume_argument(ArgumentDescriptors[*PositionalIter], Arg);
86	789	!Res) {
87	0	return cxx20::unexpected(Res.error());
88	789	} else {
89	789	CurrentDesc = *Res;
90	789	}
91	789	++PositionalIter;
92	789	}
93	1.44M	}
94	1.79M	}
95	1.04k	if (CurrentDesc && CurrentDesc->nargs() == 0) {
96	42	CurrentDesc->default_value();
97	42	}
98
99	1.04k	if (VersionOpt) {
100	138	return true;
101	138	}
102	909	if (!HelpOpt->value()) {
103	15.6k	for (const auto &Desc : ArgumentDescriptors) {
104	15.6k	if (Desc.nargs() < Desc.min_nargs()) {
105	351	help(Out);
106	351	return false;
107	351	}
108	15.6k	}
109	821	} else {
110	88	help(Out);
111	88	return true;
112	88	}
113	470	return true;
114	909	}
115
116		void ArgumentParser::SubCommandDescriptor::usage(
117	439	std::FILE *Out) const noexcept {
118	439	fmt::print(Out, "{}USAGE{}\n"sv, YELLOW_COLOR, RESET_COLOR);
119	439	for (const char *Part : ProgramNames) {
120	439	fmt::print(Out, "\t{}"sv, Part);
121	439	}
122	439	if (!SubCommandList.empty()) {
123	0	fmt::print(Out, " [SUBCOMMANDS]"sv);
124	0	}
125	439	if (!NonpositionalList.empty()) {
126	439	fmt::print(Out, " [OPTIONS]"sv);
127	439	}
128	439	bool First = true;
129	878	for (const auto &Index : PositionalList) {
130	878	const auto &Desc = ArgumentDescriptors[Index];
131	878	if (Desc.hidden()) {
132	0	continue;
133	0	}
134
135	878	if (First) {
136	439	fmt::print(Out, " [--]"sv);
137	439	First = false;
138	439	}
139
140	878	const bool Optional = (Desc.min_nargs() == 0);
141	878	fmt::print(Out, " "sv);
142	878	if (Optional) {
143	439	fmt::print(Out, "["sv);
144	439	}
145	878	switch (ArgumentDescriptors[Index].max_nargs()) {
146	0	case 0:
147	0	break;
148	439	case 1:
149	439	fmt::print(Out, "{}"sv, Desc.meta());
150	439	break;
151	439	default:
152	439	fmt::print(Out, "{} ..."sv, Desc.meta());
153	439	break;
154	878	}
155	878	if (Optional) {
156	439	fmt::print(Out, "]"sv);
157	439	}
158	878	}
159	439	fmt::print(Out, "\n"sv);
160	439	}
161
162	439	void ArgumentParser::SubCommandDescriptor::help(std::FILE *Out) const noexcept {
163		// For enabling Windows PowerShell color support.
164		#if WASMEDGE_OS_WINDOWS && WINAPI_PARTITION_DESKTOP
165		winapi::HANDLE_ OutputHandler =
166		winapi::GetStdHandle(winapi::STD_OUTPUT_HANDLE_);
167		if (OutputHandler != winapi::INVALID_HANDLE_VALUE_) {
168		winapi::DWORD_ ConsoleMode = 0;
169		if (winapi::GetConsoleMode(OutputHandler, &ConsoleMode)) {
170		ConsoleMode \|= winapi::ENABLE_VIRTUAL_TERMINAL_PROCESSING_;
171		winapi::SetConsoleMode(OutputHandler, ConsoleMode);
172		}
173		}
174		#endif
175
176	439	usage(Out);
177	439	const constexpr std::string_view kIndent = "\t"sv;
178
179	439	fmt::print(Out, "\n"sv);
180	439	if (!SubCommandList.empty()) {
181	0	fmt::print(Out, "{}SUBCOMMANDS{}\n"sv, YELLOW_COLOR, RESET_COLOR);
182	0	for (const auto Offset : SubCommandList) {
183	0	fmt::print(Out, "{}{}"sv, kIndent, GREEN_COLOR);
184	0	bool First = true;
185	0	for (const auto &Name : this[Offset].SubCommandNames) {
186	0	if (!First) {
187	0	fmt::print(Out, "\|"sv);
188	0	}
189	0	fmt::print(Out, "{}"sv, Name);
190	0	First = false;
191	0	}
192	0	fmt::print(Out, "{}\n"sv, RESET_COLOR);
193	0	indent_output(Out, kIndent, 2, 80, this[Offset].SC->description());
194	0	fmt::print(Out, "\n"sv);
195	0	}
196	0	fmt::print(Out, "\n"sv);
197	0	}
198
199	439	fmt::print(Out, "{}OPTIONS{}\n"sv, YELLOW_COLOR, RESET_COLOR);
200	12.7k	for (const auto &Index : NonpositionalList) {
201	12.7k	const auto &Desc = ArgumentDescriptors[Index];
202	12.7k	if (Desc.hidden()) {
203	0	continue;
204	0	}
205
206	12.7k	fmt::print(Out, "{}{}\n"sv, kIndent, GREEN_COLOR);
207	12.7k	bool First = true;
208	13.6k	for (const auto &Option : Desc.options()) {
209	13.6k	if (!First) {
210	878	fmt::print(Out, "\|"sv);
211	878	}
212	13.6k	if (Option.size() == 1) {
213	878	fmt::print(Out, "-{}"sv, Option);
214	12.7k	} else {
215	12.7k	fmt::print(Out, "--{}"sv, Option);
216	12.7k	}
217	13.6k	First = false;
218	13.6k	}
219	12.7k	fmt::print(Out, "{}\n"sv, RESET_COLOR);
220	12.7k	indent_output(Out, kIndent, 2, 80, Desc.description());
221	12.7k	fmt::print(Out, "\n"sv);
222	12.7k	}
223	439	}
224
225		void ArgumentParser::SubCommandDescriptor::indent_output(
226		std::FILE *Out, const std::string_view kIndent, std::size_t IndentCount,
227	12.7k	std::size_t ScreenWidth, std::string_view Desc) const noexcept {
228	12.7k	const std::size_t Width = ScreenWidth - kIndent.size() * IndentCount;
229	14.9k	while (Desc.size() > Width) {
230	2.19k	const std::size_t SpacePos = Desc.find_last_of(' ', Width);
231	2.19k	if (SpacePos != std::string_view::npos) {
232	6.58k	for (std::size_t I = 0; I < IndentCount; ++I) {
233	4.39k	fmt::print(Out, "{}"sv, kIndent);
234	4.39k	}
235	2.19k	fmt::print(Out, "{}\n"sv, Desc.substr(0, SpacePos));
236	2.19k	const std::size_t WordPos = Desc.find_first_not_of(' ', SpacePos);
237	2.19k	if (WordPos != std::string_view::npos) {
238	2.19k	Desc = Desc.substr(WordPos);
239	2.19k	} else {
240	0	Desc = {};
241	0	}
242	2.19k	}
243	2.19k	}
244	12.7k	if (!Desc.empty()) {
245	38.1k	for (std::size_t I = 0; I < IndentCount; ++I) {
246	25.4k	fmt::print(Out, "{}"sv, kIndent);
247	25.4k	}
248	12.7k	fmt::print(Out, "{}"sv, Desc);
249	12.7k	}
250	12.7k	}
251
252		cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
253		ArgumentParser::SubCommandDescriptor::consume_short_options(
254	3.42k	std::string_view Arg) noexcept {
255	3.42k	ArgumentDescriptor *CurrentDesc = nullptr;
256	205k	for (std::size_t I = 1; I < Arg.size(); ++I) {
257	202k	if (CurrentDesc && CurrentDesc->nargs() == 0) {
258	0	CurrentDesc->default_value();
259	0	}
260	202k	std::string_view Option = Arg.substr(I, 1);
261	202k	if (auto Res = consume_short_option(Option); !Res) {
262	41	return cxx20::unexpected(Res.error());
263	202k	} else {
264	202k	CurrentDesc = *Res;
265	202k	}
266	202k	}
267	3.38k	return CurrentDesc;
268	3.42k	}
269
270		cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
271		ArgumentParser::SubCommandDescriptor::consume_long_option_with_argument(
272	345k	std::string_view Arg) noexcept {
273	345k	if (auto Pos = Arg.find('=', 2); Pos != std::string_view::npos) {
274		// long option with argument
275	334k	std::string_view Option = Arg.substr(2, Pos - 2);
276	334k	std::string_view Argument = Arg.substr(Pos + 1);
277	334k	if (auto Res = consume_long_option(Option); !Res) {
278	51	return cxx20::unexpected<Error>(Res.error());
279	334k	} else if (ArgumentDescriptor CurrentDesc = Res; !CurrentDesc) {
280	10	return cxx20::unexpected<Error>(
281	10	std::in_place, ErrCode::InvalidArgument,
282	10	fmt::format("option {} doesn't need arguments."sv, Option));
283	334k	} else {
284	334k	if (auto ConsumeRes = consume_argument(*CurrentDesc, Argument);
285	334k	!ConsumeRes) {
286	217	return cxx20::unexpected<Error>(ConsumeRes.error());
287	217	}
288	333k	return nullptr;
289	334k	}
290	334k	} else {
291		// long option without argument
292	11.2k	std::string_view Option = Arg.substr(2);
293	11.2k	return consume_long_option(Option);
294	11.2k	}
295	345k	}
296
297		cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
298		ArgumentParser::SubCommandDescriptor::consume_short_option(
299	202k	std::string_view Option) noexcept {
300	202k	auto Iter = ArgumentMap.find(Option);
301	202k	if (Iter == ArgumentMap.end()) {
302	41	return cxx20::unexpected<Error>(std::in_place, ErrCode::InvalidArgument,
303	41	"unknown option: "s + std::string(Option));
304	41	}
305	202k	ArgumentDescriptor &CurrentDesc = ArgumentDescriptors[Iter->second];
306	202k	if (CurrentDesc.max_nargs() == 0) {
307	202k	CurrentDesc.default_value();
308	202k	return nullptr;
309	202k	}
310	0	return &CurrentDesc;
311	202k	}
312
313		cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
314		ArgumentParser::SubCommandDescriptor::consume_long_option(
315	345k	std::string_view Option) noexcept {
316	345k	auto Iter = ArgumentMap.find(Option);
317	345k	if (Iter == ArgumentMap.end()) {
318	237	return cxx20::unexpected<Error>(std::in_place, ErrCode::InvalidArgument,
319	237	"unknown option: "s + std::string(Option));
320	237	}
321	345k	ArgumentDescriptor &CurrentDesc = ArgumentDescriptors[Iter->second];
322	345k	if (CurrentDesc.max_nargs() == 0) {
323	1.39k	CurrentDesc.default_value();
324	1.39k	return nullptr;
325	1.39k	}
326	343k	return &CurrentDesc;
327	345k	}
328
329		cxx20::expected<ArgumentParser::ArgumentDescriptor *, Error>
330		ArgumentParser::SubCommandDescriptor::consume_argument(
331	1.78M	ArgumentDescriptor &CurrentDesc, std::string_view Argument) noexcept {
332	1.78M	if (auto Res = CurrentDesc.argument(std::string(Argument)); !Res) {
333	260	return cxx20::unexpected(Res.error());
334	260	}
335	1.78M	if (++CurrentDesc.nargs() >= CurrentDesc.max_nargs()) {
336	70.6k	return nullptr;
337	70.6k	}
338	1.71M	return &CurrentDesc;
339	1.78M	}
340
341		bool ArgumentParser::parse(std::FILE *Out, int Argc,
342	1.59k	const char *Argv[]) noexcept {
343	1.59k	if (auto Res = SubCommandDescriptors.front().parse(Out, {}, Argc, Argv, 0,
344	1.59k	VerOpt.value());
345	1.59k	!Res) {
346	548	fmt::print(Out, "{}\n"sv, Res.error().message());
347	548	return false;
348	1.04k	} else {
349	1.04k	return *Res \|\| VerOpt.value();
350	1.04k	}
351	1.59k	}
352
353		} // namespace PO
354		} // namespace WasmEdge