1 //===-- CommandLine.cpp - Command line parser implementation --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class implements a command line argument processor that is useful when
11 // creating a tool. It provides a simple, minimalistic interface that is easily
12 // extensible and supports nonlocal (library) command line options.
14 // Note that rather than trying to figure out what this code does, you could try
15 // reading the library documentation located in docs/CommandLine.html
17 //===----------------------------------------------------------------------===//
19 #include "Support/CommandLine.h"
30 //===----------------------------------------------------------------------===//
31 // Basic, shared command line option processing machinery...
34 // Return the global command line option vector. Making it a function scoped
35 // static ensures that it will be initialized correctly before its first use.
37 static std::map<std::string, Option*> *CommandLineOptions = 0;
38 static std::map<std::string, Option*> &getOpts() {
39 if (CommandLineOptions == 0)
40 CommandLineOptions = new std::map<std::string,Option*>();
41 return *CommandLineOptions;
44 static Option *getOption(const std::string &Str) {
45 if (CommandLineOptions == 0) return 0;
46 std::map<std::string,Option*>::iterator I = CommandLineOptions->find(Str);
47 return I != CommandLineOptions->end() ? I->second : 0;
50 static std::vector<Option*> &getPositionalOpts() {
51 static std::vector<Option*> *Positional = 0;
52 if (!Positional) Positional = new std::vector<Option*>();
56 static void AddArgument(const char *ArgName, Option *Opt) {
57 if (getOption(ArgName)) {
58 std::cerr << "CommandLine Error: Argument '" << ArgName
59 << "' defined more than once!\n";
61 // Add argument to the argument map!
62 getOpts()[ArgName] = Opt;
66 // RemoveArgument - It's possible that the argument is no longer in the map if
67 // options have already been processed and the map has been deleted!
69 static void RemoveArgument(const char *ArgName, Option *Opt) {
70 if (CommandLineOptions == 0) return;
71 assert(getOption(ArgName) == Opt && "Arg not in map!");
72 CommandLineOptions->erase(ArgName);
73 if (CommandLineOptions->empty()) {
74 delete CommandLineOptions;
75 CommandLineOptions = 0;
79 static const char *ProgramName = 0;
80 static const char *ProgramOverview = 0;
82 static inline bool ProvideOption(Option *Handler, const char *ArgName,
83 const char *Value, int argc, char **argv,
85 // Enforce value requirements
86 switch (Handler->getValueExpectedFlag()) {
88 if (Value == 0 || *Value == 0) { // No value specified?
89 if (i+1 < argc) { // Steal the next argument, like for '-o filename'
92 return Handler->error(" requires a value!");
98 return Handler->error(" does not allow a value! '" +
99 std::string(Value) + "' specified.");
101 case ValueOptional: break;
102 default: std::cerr << "Bad ValueMask flag! CommandLine usage error:"
103 << Handler->getValueExpectedFlag() << "\n"; abort();
106 // Run the handler now!
107 return Handler->addOccurrence(ArgName, Value);
110 static bool ProvidePositionalOption(Option *Handler, const std::string &Arg) {
112 return ProvideOption(Handler, Handler->ArgStr, Arg.c_str(), 0, 0, Dummy);
116 // Option predicates...
117 static inline bool isGrouping(const Option *O) {
118 return O->getFormattingFlag() == cl::Grouping;
120 static inline bool isPrefixedOrGrouping(const Option *O) {
121 return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
124 // getOptionPred - Check to see if there are any options that satisfy the
125 // specified predicate with names that are the prefixes in Name. This is
126 // checked by progressively stripping characters off of the name, checking to
127 // see if there options that satisfy the predicate. If we find one, return it,
128 // otherwise return null.
130 static Option *getOptionPred(std::string Name, unsigned &Length,
131 bool (*Pred)(const Option*)) {
133 Option *Op = getOption(Name);
134 if (Op && Pred(Op)) {
135 Length = Name.length();
139 if (Name.size() == 1) return 0;
141 Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
142 Op = getOption(Name);
144 // Loop while we haven't found an option and Name still has at least two
145 // characters in it (so that the next iteration will not be the empty
147 } while ((Op == 0 || !Pred(Op)) && Name.size() > 1);
149 if (Op && Pred(Op)) {
150 Length = Name.length();
151 return Op; // Found one!
153 return 0; // No option found!
156 static bool RequiresValue(const Option *O) {
157 return O->getNumOccurrencesFlag() == cl::Required ||
158 O->getNumOccurrencesFlag() == cl::OneOrMore;
161 static bool EatsUnboundedNumberOfValues(const Option *O) {
162 return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
163 O->getNumOccurrencesFlag() == cl::OneOrMore;
166 /// ParseCStringVector - Break INPUT up wherever one or more
167 /// whitespace characters are found, and store the resulting tokens in
168 /// OUTPUT. The tokens stored in OUTPUT are dynamically allocated
169 /// using strdup (), so it is the caller's responsibility to free ()
172 static void ParseCStringVector (std::vector<char *> &output,
174 // Characters which will be treated as token separators:
175 static const char *delims = " \v\f\t\r\n";
177 std::string work (input);
178 // Skip past any delims at head of input string.
179 size_t pos = work.find_first_not_of (delims);
180 // If the string consists entirely of delims, then exit early.
181 if (pos == std::string::npos) return;
182 // Otherwise, jump forward to beginning of first word.
183 work = work.substr (pos);
184 // Find position of first delimiter.
185 pos = work.find_first_of (delims);
187 while (!work.empty() && pos != std::string::npos) {
188 // Everything from 0 to POS is the next word to copy.
189 output.push_back (strdup (work.substr (0,pos).c_str ()));
190 // Is there another word in the string?
191 size_t nextpos = work.find_first_not_of (delims, pos + 1);
192 if (nextpos != std::string::npos) {
193 // Yes? Then remove delims from beginning ...
194 work = work.substr (work.find_first_not_of (delims, pos + 1));
195 // and find the end of the word.
196 pos = work.find_first_of (delims);
198 // No? (Remainder of string is delims.) End the loop.
200 pos = std::string::npos;
204 // If `input' ended with non-delim char, then we'll get here with
205 // the last word of `input' in `work'; copy it now.
206 if (!work.empty ()) {
207 output.push_back (strdup (work.c_str ()));
211 /// ParseEnvironmentOptions - An alternative entry point to the
212 /// CommandLine library, which allows you to read the program's name
213 /// from the caller (as PROGNAME) and its command-line arguments from
214 /// an environment variable (whose name is given in ENVVAR).
216 void cl::ParseEnvironmentOptions(const char *progName, const char *envVar,
217 const char *Overview) {
219 assert(progName && "Program name not specified");
220 assert(envVar && "Environment variable name missing");
222 // Get the environment variable they want us to parse options out of.
223 const char *envValue = getenv (envVar);
227 // Get program's "name", which we wouldn't know without the caller
229 std::vector<char *> newArgv;
230 newArgv.push_back (strdup (progName));
232 // Parse the value of the environment variable into a "command line"
233 // and hand it off to ParseCommandLineOptions().
234 ParseCStringVector (newArgv, envValue);
235 int newArgc = newArgv.size ();
236 ParseCommandLineOptions (newArgc, &newArgv[0], Overview);
238 // Free all the strdup()ed strings.
239 for (std::vector<char *>::iterator i = newArgv.begin (), e = newArgv.end ();
245 /// LookupOption - Lookup the option specified by the specified option on the
246 /// command line. If there is a value specified (after an equal sign) return
248 static Option *LookupOption(const char *&Arg, const char *&Value) {
249 while (*Arg == '-') ++Arg; // Eat leading dashes
251 const char *ArgEnd = Arg;
252 while (*ArgEnd && *ArgEnd != '=')
253 ++ArgEnd; // Scan till end of argument name...
256 if (*Value) // If we have an equals sign...
257 ++Value; // Advance to value...
259 if (*Arg == 0) return 0;
261 // Look up the option.
262 std::map<std::string, Option*> &Opts = getOpts();
263 std::map<std::string, Option*>::iterator I =
264 Opts.find(std::string(Arg, ArgEnd));
265 return (I != Opts.end()) ? I->second : 0;
268 void cl::ParseCommandLineOptions(int &argc, char **argv,
269 const char *Overview) {
270 assert((!getOpts().empty() || !getPositionalOpts().empty()) &&
271 "No options specified, or ParseCommandLineOptions called more"
273 ProgramName = argv[0]; // Save this away safe and snug
274 ProgramOverview = Overview;
275 bool ErrorParsing = false;
277 std::map<std::string, Option*> &Opts = getOpts();
278 std::vector<Option*> &PositionalOpts = getPositionalOpts();
280 // Check out the positional arguments to collect information about them.
281 unsigned NumPositionalRequired = 0;
282 Option *ConsumeAfterOpt = 0;
283 if (!PositionalOpts.empty()) {
284 if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
285 assert(PositionalOpts.size() > 1 &&
286 "Cannot specify cl::ConsumeAfter without a positional argument!");
287 ConsumeAfterOpt = PositionalOpts[0];
290 // Calculate how many positional values are _required_.
291 bool UnboundedFound = false;
292 for (unsigned i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
294 Option *Opt = PositionalOpts[i];
295 if (RequiresValue(Opt))
296 ++NumPositionalRequired;
297 else if (ConsumeAfterOpt) {
298 // ConsumeAfter cannot be combined with "optional" positional options
299 // unless there is only one positional argument...
300 if (PositionalOpts.size() > 2)
302 Opt->error(" error - this positional option will never be matched, "
303 "because it does not Require a value, and a "
304 "cl::ConsumeAfter option is active!");
305 } else if (UnboundedFound && !Opt->ArgStr[0]) {
306 // This option does not "require" a value... Make sure this option is
307 // not specified after an option that eats all extra arguments, or this
308 // one will never get any!
310 ErrorParsing |= Opt->error(" error - option can never match, because "
311 "another positional argument will match an "
312 "unbounded number of values, and this option"
313 " does not require a value!");
315 UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
319 // PositionalVals - A vector of "positional" arguments we accumulate into to
320 // processes at the end...
322 std::vector<std::string> PositionalVals;
324 // If the program has named positional arguments, and the name has been run
325 // across, keep track of which positional argument was named. Otherwise put
326 // the positional args into the PositionalVals list...
327 Option *ActivePositionalArg = 0;
329 // Loop over all of the arguments... processing them.
330 bool DashDashFound = false; // Have we read '--'?
331 for (int i = 1; i < argc; ++i) {
333 const char *Value = "";
334 const char *ArgName = "";
336 // Check to see if this is a positional argument. This argument is
337 // considered to be positional if it doesn't start with '-', if it is "-"
338 // itself, or if we have seen "--" already.
340 if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
341 // Positional argument!
342 if (ActivePositionalArg) {
343 ProvidePositionalOption(ActivePositionalArg, argv[i]);
344 continue; // We are done!
345 } else if (!PositionalOpts.empty()) {
346 PositionalVals.push_back(argv[i]);
348 // All of the positional arguments have been fulfulled, give the rest to
349 // the consume after option... if it's specified...
351 if (PositionalVals.size() >= NumPositionalRequired &&
352 ConsumeAfterOpt != 0) {
353 for (++i; i < argc; ++i)
354 PositionalVals.push_back(argv[i]);
355 break; // Handle outside of the argument processing loop...
358 // Delay processing positional arguments until the end...
361 } else if (argv[i][0] == '-' && argv[i][1] == '-' && argv[i][2] == 0 &&
363 DashDashFound = true; // This is the mythical "--"?
364 continue; // Don't try to process it as an argument itself.
365 } else if (ActivePositionalArg &&
366 (ActivePositionalArg->getMiscFlags() & PositionalEatsArgs)) {
367 // If there is a positional argument eating options, check to see if this
368 // option is another positional argument. If so, treat it as an argument,
369 // otherwise feed it to the eating positional.
371 Handler = LookupOption(ArgName, Value);
372 if (!Handler || Handler->getFormattingFlag() != cl::Positional) {
373 ProvidePositionalOption(ActivePositionalArg, argv[i]);
374 continue; // We are done!
377 } else { // We start with a '-', must be an argument...
379 Handler = LookupOption(ArgName, Value);
381 // Check to see if this "option" is really a prefixed or grouped argument.
382 if (Handler == 0 && *Value == 0) {
383 std::string RealName(ArgName);
384 if (RealName.size() > 1) {
386 Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping);
388 // If the option is a prefixed option, then the value is simply the
389 // rest of the name... so fall through to later processing, by
390 // setting up the argument name flags and value fields.
392 if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
393 Value = ArgName+Length;
394 assert(Opts.find(std::string(ArgName, Value)) != Opts.end() &&
395 Opts.find(std::string(ArgName, Value))->second == PGOpt);
398 // This must be a grouped option... handle them now.
399 assert(isGrouping(PGOpt) && "Broken getOptionPred!");
402 // Move current arg name out of RealName into RealArgName...
403 std::string RealArgName(RealName.begin(),
404 RealName.begin() + Length);
405 RealName.erase(RealName.begin(), RealName.begin() + Length);
407 // Because ValueRequired is an invalid flag for grouped arguments,
408 // we don't need to pass argc/argv in...
410 assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
411 "Option can not be cl::Grouping AND cl::ValueRequired!");
413 ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(),
416 // Get the next grouping option...
417 PGOpt = getOptionPred(RealName, Length, isGrouping);
418 } while (PGOpt && Length != RealName.size());
420 Handler = PGOpt; // Ate all of the options.
427 std::cerr << "Unknown command line argument '" << argv[i] << "'. Try: '"
428 << argv[0] << " --help'\n";
433 // Check to see if this option accepts a comma separated list of values. If
434 // it does, we have to split up the value into multiple values...
435 if (Handler->getMiscFlags() & CommaSeparated) {
436 std::string Val(Value);
437 std::string::size_type Pos = Val.find(',');
439 while (Pos != std::string::npos) {
440 // Process the portion before the comma...
441 ErrorParsing |= ProvideOption(Handler, ArgName,
442 std::string(Val.begin(),
443 Val.begin()+Pos).c_str(),
445 // Erase the portion before the comma, AND the comma...
446 Val.erase(Val.begin(), Val.begin()+Pos+1);
447 Value += Pos+1; // Increment the original value pointer as well...
449 // Check for another comma...
454 // If this is a named positional argument, just remember that it is the
456 if (Handler->getFormattingFlag() == cl::Positional)
457 ActivePositionalArg = Handler;
459 ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
462 // Check and handle positional arguments now...
463 if (NumPositionalRequired > PositionalVals.size()) {
464 std::cerr << "Not enough positional command line arguments specified!\n"
465 << "Must specify at least " << NumPositionalRequired
466 << " positional arguments: See: " << argv[0] << " --help\n";
470 } else if (ConsumeAfterOpt == 0) {
471 // Positional args have already been handled if ConsumeAfter is specified...
472 unsigned ValNo = 0, NumVals = PositionalVals.size();
473 for (unsigned i = 0, e = PositionalOpts.size(); i != e; ++i) {
474 if (RequiresValue(PositionalOpts[i])) {
475 ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
476 --NumPositionalRequired; // We fulfilled our duty...
479 // If we _can_ give this option more arguments, do so now, as long as we
480 // do not give it values that others need. 'Done' controls whether the
481 // option even _WANTS_ any more.
483 bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
484 while (NumVals-ValNo > NumPositionalRequired && !Done) {
485 switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
487 Done = true; // Optional arguments want _at most_ one value
489 case cl::ZeroOrMore: // Zero or more will take all they can get...
490 case cl::OneOrMore: // One or more will take all they can get...
491 ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
494 assert(0 && "Internal error, unexpected NumOccurrences flag in "
495 "positional argument processing!");
500 assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
502 for (unsigned j = 1, e = PositionalOpts.size(); j != e; ++j)
503 if (RequiresValue(PositionalOpts[j]))
504 ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
505 PositionalVals[ValNo++]);
507 // Handle the case where there is just one positional option, and it's
508 // optional. In this case, we want to give JUST THE FIRST option to the
509 // positional option and keep the rest for the consume after. The above
510 // loop would have assigned no values to positional options in this case.
512 if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty())
513 ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
514 PositionalVals[ValNo++]);
516 // Handle over all of the rest of the arguments to the
517 // cl::ConsumeAfter command line option...
518 for (; ValNo != PositionalVals.size(); ++ValNo)
519 ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
520 PositionalVals[ValNo]);
523 // Loop over args and make sure all required args are specified!
524 for (std::map<std::string, Option*>::iterator I = Opts.begin(),
525 E = Opts.end(); I != E; ++I) {
526 switch (I->second->getNumOccurrencesFlag()) {
529 if (I->second->getNumOccurrences() == 0) {
530 I->second->error(" must be specified at least once!");
539 // Free all of the memory allocated to the map. Command line options may only
540 // be processed once!
541 delete CommandLineOptions;
542 CommandLineOptions = 0;
543 PositionalOpts.clear();
545 // If we had an error processing our arguments, don't let the program execute
546 if (ErrorParsing) exit(1);
549 //===----------------------------------------------------------------------===//
550 // Option Base class implementation
553 bool Option::error(std::string Message, const char *ArgName) {
554 if (ArgName == 0) ArgName = ArgStr;
556 std::cerr << HelpStr; // Be nice for positional arguments
558 std::cerr << "-" << ArgName;
559 std::cerr << " option" << Message << "\n";
563 bool Option::addOccurrence(const char *ArgName, const std::string &Value) {
564 NumOccurrences++; // Increment the number of times we have been seen
566 switch (getNumOccurrencesFlag()) {
568 if (NumOccurrences > 1)
569 return error(": may only occur zero or one times!", ArgName);
572 if (NumOccurrences > 1)
573 return error(": must occur exactly one time!", ArgName);
577 case ConsumeAfter: break;
578 default: return error(": bad num occurrences flag value!");
581 return handleOccurrence(ArgName, Value);
584 // addArgument - Tell the system that this Option subclass will handle all
585 // occurrences of -ArgStr on the command line.
587 void Option::addArgument(const char *ArgStr) {
589 AddArgument(ArgStr, this);
591 if (getFormattingFlag() == Positional)
592 getPositionalOpts().push_back(this);
593 else if (getNumOccurrencesFlag() == ConsumeAfter) {
594 if (!getPositionalOpts().empty() &&
595 getPositionalOpts().front()->getNumOccurrencesFlag() == ConsumeAfter)
596 error("Cannot specify more than one option with cl::ConsumeAfter!");
597 getPositionalOpts().insert(getPositionalOpts().begin(), this);
601 void Option::removeArgument(const char *ArgStr) {
603 RemoveArgument(ArgStr, this);
605 if (getFormattingFlag() == Positional) {
606 std::vector<Option*>::iterator I =
607 std::find(getPositionalOpts().begin(), getPositionalOpts().end(), this);
608 assert(I != getPositionalOpts().end() && "Arg not registered!");
609 getPositionalOpts().erase(I);
610 } else if (getNumOccurrencesFlag() == ConsumeAfter) {
611 assert(!getPositionalOpts().empty() && getPositionalOpts()[0] == this &&
612 "Arg not registered correctly!");
613 getPositionalOpts().erase(getPositionalOpts().begin());
618 // getValueStr - Get the value description string, using "DefaultMsg" if nothing
619 // has been specified yet.
621 static const char *getValueStr(const Option &O, const char *DefaultMsg) {
622 if (O.ValueStr[0] == 0) return DefaultMsg;
626 //===----------------------------------------------------------------------===//
627 // cl::alias class implementation
630 // Return the width of the option tag for printing...
631 unsigned alias::getOptionWidth() const {
632 return std::strlen(ArgStr)+6;
635 // Print out the option for the alias...
636 void alias::printOptionInfo(unsigned GlobalWidth) const {
637 unsigned L = std::strlen(ArgStr);
638 std::cerr << " -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
644 //===----------------------------------------------------------------------===//
645 // Parser Implementation code...
648 // basic_parser implementation
651 // Return the width of the option tag for printing...
652 unsigned basic_parser_impl::getOptionWidth(const Option &O) const {
653 unsigned Len = std::strlen(O.ArgStr);
654 if (const char *ValName = getValueName())
655 Len += std::strlen(getValueStr(O, ValName))+3;
660 // printOptionInfo - Print out information about this option. The
661 // to-be-maintained width is specified.
663 void basic_parser_impl::printOptionInfo(const Option &O,
664 unsigned GlobalWidth) const {
665 std::cerr << " -" << O.ArgStr;
667 if (const char *ValName = getValueName())
668 std::cerr << "=<" << getValueStr(O, ValName) << ">";
670 std::cerr << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
671 << O.HelpStr << "\n";
677 // parser<bool> implementation
679 bool parser<bool>::parse(Option &O, const char *ArgName,
680 const std::string &Arg, bool &Value) {
681 if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
684 } else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
687 return O.error(": '" + Arg +
688 "' is invalid value for boolean argument! Try 0 or 1");
693 // parser<int> implementation
695 bool parser<int>::parse(Option &O, const char *ArgName,
696 const std::string &Arg, int &Value) {
698 Value = (int)strtol(Arg.c_str(), &End, 0);
700 return O.error(": '" + Arg + "' value invalid for integer argument!");
704 // parser<unsigned> implementation
706 bool parser<unsigned>::parse(Option &O, const char *ArgName,
707 const std::string &Arg, unsigned &Value) {
710 unsigned long V = strtoul(Arg.c_str(), &End, 0);
712 if (((V == ULONG_MAX) && (errno == ERANGE))
715 return O.error(": '" + Arg + "' value invalid for uint argument!");
719 // parser<double>/parser<float> implementation
721 static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
722 const char *ArgStart = Arg.c_str();
724 Value = strtod(ArgStart, &End);
726 return O.error(": '" +Arg+ "' value invalid for floating point argument!");
730 bool parser<double>::parse(Option &O, const char *AN,
731 const std::string &Arg, double &Val) {
732 return parseDouble(O, Arg, Val);
735 bool parser<float>::parse(Option &O, const char *AN,
736 const std::string &Arg, float &Val) {
738 if (parseDouble(O, Arg, dVal))
746 // generic_parser_base implementation
749 // findOption - Return the option number corresponding to the specified
750 // argument string. If the option is not found, getNumOptions() is returned.
752 unsigned generic_parser_base::findOption(const char *Name) {
753 unsigned i = 0, e = getNumOptions();
757 if (getOption(i) == N)
765 // Return the width of the option tag for printing...
766 unsigned generic_parser_base::getOptionWidth(const Option &O) const {
768 unsigned Size = std::strlen(O.ArgStr)+6;
769 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
770 Size = std::max(Size, (unsigned)std::strlen(getOption(i))+8);
773 unsigned BaseSize = 0;
774 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
775 BaseSize = std::max(BaseSize, (unsigned)std::strlen(getOption(i))+8);
780 // printOptionInfo - Print out information about this option. The
781 // to-be-maintained width is specified.
783 void generic_parser_base::printOptionInfo(const Option &O,
784 unsigned GlobalWidth) const {
786 unsigned L = std::strlen(O.ArgStr);
787 std::cerr << " -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
788 << " - " << O.HelpStr << "\n";
790 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
791 unsigned NumSpaces = GlobalWidth-strlen(getOption(i))-8;
792 std::cerr << " =" << getOption(i) << std::string(NumSpaces, ' ')
793 << " - " << getDescription(i) << "\n";
797 std::cerr << " " << O.HelpStr << "\n";
798 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
799 unsigned L = std::strlen(getOption(i));
800 std::cerr << " -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
801 << " - " << getDescription(i) << "\n";
807 //===----------------------------------------------------------------------===//
808 // --help and --help-hidden option implementation
814 const Option *EmptyArg;
815 const bool ShowHidden;
817 // isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
818 inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
819 return OptPair.second->getOptionHiddenFlag() >= Hidden;
821 inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
822 return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
826 HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
830 void operator=(bool Value) {
831 if (Value == false) return;
833 // Copy Options into a vector so we can sort them as we like...
834 std::vector<std::pair<std::string, Option*> > Options;
835 copy(getOpts().begin(), getOpts().end(), std::back_inserter(Options));
837 // Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
838 Options.erase(std::remove_if(Options.begin(), Options.end(),
839 std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
842 // Eliminate duplicate entries in table (from enum flags options, f.e.)
843 { // Give OptionSet a scope
844 std::set<Option*> OptionSet;
845 for (unsigned i = 0; i != Options.size(); ++i)
846 if (OptionSet.count(Options[i].second) == 0)
847 OptionSet.insert(Options[i].second); // Add new entry to set
849 Options.erase(Options.begin()+i--); // Erase duplicate
853 std::cerr << "OVERVIEW:" << ProgramOverview << "\n";
855 std::cerr << "USAGE: " << ProgramName << " [options]";
857 // Print out the positional options...
858 std::vector<Option*> &PosOpts = getPositionalOpts();
859 Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
860 if (!PosOpts.empty() && PosOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
863 for (unsigned i = CAOpt != 0, e = PosOpts.size(); i != e; ++i) {
864 if (PosOpts[i]->ArgStr[0])
865 std::cerr << " --" << PosOpts[i]->ArgStr;
866 std::cerr << " " << PosOpts[i]->HelpStr;
869 // Print the consume after option info if it exists...
870 if (CAOpt) std::cerr << " " << CAOpt->HelpStr;
874 // Compute the maximum argument length...
876 for (unsigned i = 0, e = Options.size(); i != e; ++i)
877 MaxArgLen = std::max(MaxArgLen, Options[i].second->getOptionWidth());
879 std::cerr << "OPTIONS:\n";
880 for (unsigned i = 0, e = Options.size(); i != e; ++i)
881 Options[i].second->printOptionInfo(MaxArgLen);
883 // Halt the program if help information is printed
890 // Define the two HelpPrinter instances that are used to print out help, or
893 HelpPrinter NormalPrinter(false);
894 HelpPrinter HiddenPrinter(true);
896 cl::opt<HelpPrinter, true, parser<bool> >
897 HOp("help", cl::desc("display available options (--help-hidden for more)"),
898 cl::location(NormalPrinter), cl::ValueDisallowed);
900 cl::opt<HelpPrinter, true, parser<bool> >
901 HHOp("help-hidden", cl::desc("display all available options"),
902 cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
904 } // End anonymous namespace