diff options
Diffstat (limited to 'third_party/nix/src/libutil/args.cc')
| -rw-r--r-- | third_party/nix/src/libutil/args.cc | 313 |
1 files changed, 148 insertions, 165 deletions
diff --git a/third_party/nix/src/libutil/args.cc b/third_party/nix/src/libutil/args.cc index 7af2a1bf73..b5bfb0e6a7 100644 --- a/third_party/nix/src/libutil/args.cc +++ b/third_party/nix/src/libutil/args.cc @@ -3,201 +3,184 @@ namespace nix { -Args::FlagMaker Args::mkFlag() -{ - return FlagMaker(*this); -} +Args::FlagMaker Args::mkFlag() { return FlagMaker(*this); } -Args::FlagMaker::~FlagMaker() -{ - assert(flag->longName != ""); - args.longFlags[flag->longName] = flag; - if (flag->shortName) args.shortFlags[flag->shortName] = flag; +Args::FlagMaker::~FlagMaker() { + assert(flag->longName != ""); + args.longFlags[flag->longName] = flag; + if (flag->shortName) args.shortFlags[flag->shortName] = flag; } -void Args::parseCmdline(const Strings & _cmdline) -{ - Strings pendingArgs; - bool dashDash = false; - - Strings cmdline(_cmdline); - - for (auto pos = cmdline.begin(); pos != cmdline.end(); ) { - - auto arg = *pos; - - /* Expand compound dash options (i.e., `-qlf' -> `-q -l -f', - `-j3` -> `-j 3`). */ - if (!dashDash && arg.length() > 2 && arg[0] == '-' && arg[1] != '-' && isalpha(arg[1])) { - *pos = (string) "-" + arg[1]; - auto next = pos; ++next; - for (unsigned int j = 2; j < arg.length(); j++) - if (isalpha(arg[j])) - cmdline.insert(next, (string) "-" + arg[j]); - else { - cmdline.insert(next, string(arg, j)); - break; - } - arg = *pos; - } - - if (!dashDash && arg == "--") { - dashDash = true; - ++pos; - } - else if (!dashDash && std::string(arg, 0, 1) == "-") { - if (!processFlag(pos, cmdline.end())) - throw UsageError(format("unrecognised flag '%1%'") % arg); - } +void Args::parseCmdline(const Strings& _cmdline) { + Strings pendingArgs; + bool dashDash = false; + + Strings cmdline(_cmdline); + + for (auto pos = cmdline.begin(); pos != cmdline.end();) { + auto arg = *pos; + + /* Expand compound dash options (i.e., `-qlf' -> `-q -l -f', + `-j3` -> `-j 3`). */ + if (!dashDash && arg.length() > 2 && arg[0] == '-' && arg[1] != '-' && + isalpha(arg[1])) { + *pos = (string) "-" + arg[1]; + auto next = pos; + ++next; + for (unsigned int j = 2; j < arg.length(); j++) + if (isalpha(arg[j])) + cmdline.insert(next, (string) "-" + arg[j]); else { - pendingArgs.push_back(*pos++); - if (processArgs(pendingArgs, false)) - pendingArgs.clear(); + cmdline.insert(next, string(arg, j)); + break; } + arg = *pos; } - processArgs(pendingArgs, true); + if (!dashDash && arg == "--") { + dashDash = true; + ++pos; + } else if (!dashDash && std::string(arg, 0, 1) == "-") { + if (!processFlag(pos, cmdline.end())) + throw UsageError(format("unrecognised flag '%1%'") % arg); + } else { + pendingArgs.push_back(*pos++); + if (processArgs(pendingArgs, false)) pendingArgs.clear(); + } + } + + processArgs(pendingArgs, true); } -void Args::printHelp(const string & programName, std::ostream & out) -{ - std::cout << "Usage: " << programName << " <FLAGS>..."; - for (auto & exp : expectedArgs) { - std::cout << renderLabels({exp.label}); - // FIXME: handle arity > 1 - if (exp.arity == 0) std::cout << "..."; - if (exp.optional) std::cout << "?"; - } - std::cout << "\n"; +void Args::printHelp(const string& programName, std::ostream& out) { + std::cout << "Usage: " << programName << " <FLAGS>..."; + for (auto& exp : expectedArgs) { + std::cout << renderLabels({exp.label}); + // FIXME: handle arity > 1 + if (exp.arity == 0) std::cout << "..."; + if (exp.optional) std::cout << "?"; + } + std::cout << "\n"; - auto s = description(); - if (s != "") - std::cout << "\nSummary: " << s << ".\n"; + auto s = description(); + if (s != "") std::cout << "\nSummary: " << s << ".\n"; - if (longFlags.size()) { - std::cout << "\n"; - std::cout << "Flags:\n"; - printFlags(out); - } + if (longFlags.size()) { + std::cout << "\n"; + std::cout << "Flags:\n"; + printFlags(out); + } } -void Args::printFlags(std::ostream & out) -{ - Table2 table; - for (auto & flag : longFlags) { - if (hiddenCategories.count(flag.second->category)) continue; - table.push_back(std::make_pair( - (flag.second->shortName ? std::string("-") + flag.second->shortName + ", " : " ") - + "--" + flag.first + renderLabels(flag.second->labels), - flag.second->description)); - } - printTable(out, table); +void Args::printFlags(std::ostream& out) { + Table2 table; + for (auto& flag : longFlags) { + if (hiddenCategories.count(flag.second->category)) continue; + table.push_back(std::make_pair( + (flag.second->shortName + ? std::string("-") + flag.second->shortName + ", " + : " ") + + "--" + flag.first + renderLabels(flag.second->labels), + flag.second->description)); + } + printTable(out, table); } -bool Args::processFlag(Strings::iterator & pos, Strings::iterator end) -{ - assert(pos != end); - - auto process = [&](const std::string & name, const Flag & flag) -> bool { - ++pos; - std::vector<std::string> args; - for (size_t n = 0 ; n < flag.arity; ++n) { - if (pos == end) { - if (flag.arity == ArityAny) break; - throw UsageError(format("flag '%1%' requires %2% argument(s)") - % name % flag.arity); - } - args.push_back(*pos++); - } - flag.handler(std::move(args)); - return true; - }; - - if (string(*pos, 0, 2) == "--") { - auto i = longFlags.find(string(*pos, 2)); - if (i == longFlags.end()) return false; - return process("--" + i->first, *i->second); +bool Args::processFlag(Strings::iterator& pos, Strings::iterator end) { + assert(pos != end); + + auto process = [&](const std::string& name, const Flag& flag) -> bool { + ++pos; + std::vector<std::string> args; + for (size_t n = 0; n < flag.arity; ++n) { + if (pos == end) { + if (flag.arity == ArityAny) break; + throw UsageError(format("flag '%1%' requires %2% argument(s)") % name % + flag.arity); + } + args.push_back(*pos++); } - - if (string(*pos, 0, 1) == "-" && pos->size() == 2) { - auto c = (*pos)[1]; - auto i = shortFlags.find(c); - if (i == shortFlags.end()) return false; - return process(std::string("-") + c, *i->second); - } - - return false; + flag.handler(std::move(args)); + return true; + }; + + if (string(*pos, 0, 2) == "--") { + auto i = longFlags.find(string(*pos, 2)); + if (i == longFlags.end()) return false; + return process("--" + i->first, *i->second); + } + + if (string(*pos, 0, 1) == "-" && pos->size() == 2) { + auto c = (*pos)[1]; + auto i = shortFlags.find(c); + if (i == shortFlags.end()) return false; + return process(std::string("-") + c, *i->second); + } + + return false; } -bool Args::processArgs(const Strings & args, bool finish) -{ - if (expectedArgs.empty()) { - if (!args.empty()) - throw UsageError(format("unexpected argument '%1%'") % args.front()); - return true; - } +bool Args::processArgs(const Strings& args, bool finish) { + if (expectedArgs.empty()) { + if (!args.empty()) + throw UsageError(format("unexpected argument '%1%'") % args.front()); + return true; + } - auto & exp = expectedArgs.front(); + auto& exp = expectedArgs.front(); - bool res = false; + bool res = false; - if ((exp.arity == 0 && finish) || - (exp.arity > 0 && args.size() == exp.arity)) - { - std::vector<std::string> ss; - for (auto & s : args) ss.push_back(s); - exp.handler(std::move(ss)); - expectedArgs.pop_front(); - res = true; - } + if ((exp.arity == 0 && finish) || + (exp.arity > 0 && args.size() == exp.arity)) { + std::vector<std::string> ss; + for (auto& s : args) ss.push_back(s); + exp.handler(std::move(ss)); + expectedArgs.pop_front(); + res = true; + } - if (finish && !expectedArgs.empty() && !expectedArgs.front().optional) - throw UsageError("more arguments are required"); + if (finish && !expectedArgs.empty() && !expectedArgs.front().optional) + throw UsageError("more arguments are required"); - return res; + return res; } -Args::FlagMaker & Args::FlagMaker::mkHashTypeFlag(HashType * ht) -{ - arity(1); - label("type"); - description("hash algorithm ('md5', 'sha1', 'sha256', or 'sha512')"); - handler([ht](std::string s) { - *ht = parseHashType(s); - if (*ht == htUnknown) - throw UsageError("unknown hash type '%1%'", s); - }); - return *this; +Args::FlagMaker& Args::FlagMaker::mkHashTypeFlag(HashType* ht) { + arity(1); + label("type"); + description("hash algorithm ('md5', 'sha1', 'sha256', or 'sha512')"); + handler([ht](std::string s) { + *ht = parseHashType(s); + if (*ht == htUnknown) throw UsageError("unknown hash type '%1%'", s); + }); + return *this; } -Strings argvToStrings(int argc, char * * argv) -{ - Strings args; - argc--; argv++; - while (argc--) args.push_back(*argv++); - return args; +Strings argvToStrings(int argc, char** argv) { + Strings args; + argc--; + argv++; + while (argc--) args.push_back(*argv++); + return args; } -std::string renderLabels(const Strings & labels) -{ - std::string res; - for (auto label : labels) { - for (auto & c : label) c = std::toupper(c); - res += " <" + label + ">"; - } - return res; +std::string renderLabels(const Strings& labels) { + std::string res; + for (auto label : labels) { + for (auto& c : label) c = std::toupper(c); + res += " <" + label + ">"; + } + return res; } -void printTable(std::ostream & out, const Table2 & table) -{ - size_t max = 0; - for (auto & row : table) - max = std::max(max, row.first.size()); - for (auto & row : table) { - out << " " << row.first - << std::string(max - row.first.size() + 2, ' ') - << row.second << "\n"; - } +void printTable(std::ostream& out, const Table2& table) { + size_t max = 0; + for (auto& row : table) max = std::max(max, row.first.size()); + for (auto& row : table) { + out << " " << row.first << std::string(max - row.first.size() + 2, ' ') + << row.second << "\n"; + } } -} +} // namespace nix |