forked from OSchip/llvm-project
780 lines
27 KiB
C++
780 lines
27 KiB
C++
//===-- CommandLine.cpp - Command line parser implementation --------------===//
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//
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// This class implements a command line argument processor that is useful when
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// creating a tool. It provides a simple, minimalistic interface that is easily
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// extensible and supports nonlocal (library) command line options.
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//
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// Note that rather than trying to figure out what this code does, you could try
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// reading the library documentation located in docs/CommandLine.html
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//
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//===----------------------------------------------------------------------===//
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#include "Support/CommandLine.h"
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#include <algorithm>
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#include <map>
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#include <set>
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#include <iostream>
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using namespace cl;
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//===----------------------------------------------------------------------===//
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// Basic, shared command line option processing machinery...
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//
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// Return the global command line option vector. Making it a function scoped
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// static ensures that it will be initialized correctly before its first use.
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//
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static std::map<std::string, Option*> *CommandLineOptions = 0;
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static std::map<std::string, Option*> &getOpts() {
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if (CommandLineOptions == 0)
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CommandLineOptions = new std::map<std::string,Option*>();
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return *CommandLineOptions;
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}
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static Option *getOption(const std::string &Str) {
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if (CommandLineOptions == 0) return 0;
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std::map<std::string,Option*>::iterator I = CommandLineOptions->find(Str);
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return I != CommandLineOptions->end() ? I->second : 0;
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}
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static std::vector<Option*> &getPositionalOpts() {
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static std::vector<Option*> Positional;
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return Positional;
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}
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static void AddArgument(const char *ArgName, Option *Opt) {
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if (getOption(ArgName)) {
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std::cerr << "CommandLine Error: Argument '" << ArgName
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<< "' defined more than once!\n";
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} else {
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// Add argument to the argument map!
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getOpts()[ArgName] = Opt;
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}
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}
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// RemoveArgument - It's possible that the argument is no longer in the map if
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// options have already been processed and the map has been deleted!
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//
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static void RemoveArgument(const char *ArgName, Option *Opt) {
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if (CommandLineOptions == 0) return;
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assert(getOption(ArgName) == Opt && "Arg not in map!");
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CommandLineOptions->erase(ArgName);
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if (CommandLineOptions->empty()) {
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delete CommandLineOptions;
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CommandLineOptions = 0;
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}
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}
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static const char *ProgramName = 0;
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static const char *ProgramOverview = 0;
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static inline bool ProvideOption(Option *Handler, const char *ArgName,
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const char *Value, int argc, char **argv,
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int &i) {
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// Enforce value requirements
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switch (Handler->getValueExpectedFlag()) {
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case ValueRequired:
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if (Value == 0 || *Value == 0) { // No value specified?
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if (i+1 < argc) { // Steal the next argument, like for '-o filename'
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Value = argv[++i];
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} else {
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return Handler->error(" requires a value!");
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}
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}
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break;
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case ValueDisallowed:
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if (*Value != 0)
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return Handler->error(" does not allow a value! '" +
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std::string(Value) + "' specified.");
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break;
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case ValueOptional: break;
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default: std::cerr << "Bad ValueMask flag! CommandLine usage error:"
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<< Handler->getValueExpectedFlag() << "\n"; abort();
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}
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// Run the handler now!
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return Handler->addOccurrence(ArgName, Value);
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}
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static bool ProvidePositionalOption(Option *Handler, std::string &Arg) {
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int Dummy;
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return ProvideOption(Handler, "", Arg.c_str(), 0, 0, Dummy);
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}
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// Option predicates...
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static inline bool isGrouping(const Option *O) {
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return O->getFormattingFlag() == cl::Grouping;
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}
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static inline bool isPrefixedOrGrouping(const Option *O) {
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return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
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}
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// getOptionPred - Check to see if there are any options that satisfy the
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// specified predicate with names that are the prefixes in Name. This is
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// checked by progressively stripping characters off of the name, checking to
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// see if there options that satisfy the predicate. If we find one, return it,
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// otherwise return null.
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//
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static Option *getOptionPred(std::string Name, unsigned &Length,
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bool (*Pred)(const Option*)) {
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Option *Op = getOption(Name);
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if (Op && Pred(Op)) {
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Length = Name.length();
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return Op;
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}
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if (Name.size() == 1) return 0;
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do {
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Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
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Op = getOption(Name);
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// Loop while we haven't found an option and Name still has at least two
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// characters in it (so that the next iteration will not be the empty
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// string...
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} while ((Op == 0 || !Pred(Op)) && Name.size() > 1);
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if (Op && Pred(Op)) {
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Length = Name.length();
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return Op; // Found one!
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}
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return 0; // No option found!
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}
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static bool RequiresValue(const Option *O) {
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return O->getNumOccurrencesFlag() == cl::Required ||
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O->getNumOccurrencesFlag() == cl::OneOrMore;
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}
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static bool EatsUnboundedNumberOfValues(const Option *O) {
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return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
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O->getNumOccurrencesFlag() == cl::OneOrMore;
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}
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void cl::ParseCommandLineOptions(int &argc, char **argv,
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const char *Overview) {
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assert((!getOpts().empty() || !getPositionalOpts().empty()) &&
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"No options specified, or ParseCommandLineOptions called more"
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" than once!");
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ProgramName = argv[0]; // Save this away safe and snug
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ProgramOverview = Overview;
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bool ErrorParsing = false;
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std::map<std::string, Option*> &Opts = getOpts();
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std::vector<Option*> &PositionalOpts = getPositionalOpts();
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// Check out the positional arguments to collect information about them.
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unsigned NumPositionalRequired = 0;
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Option *ConsumeAfterOpt = 0;
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if (!PositionalOpts.empty()) {
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if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
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assert(PositionalOpts.size() > 1 &&
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"Cannot specify cl::ConsumeAfter without a positional argument!");
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ConsumeAfterOpt = PositionalOpts[0];
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}
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// Calculate how many positional values are _required_.
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bool UnboundedFound = false;
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for (unsigned i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
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i != e; ++i) {
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Option *Opt = PositionalOpts[i];
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if (RequiresValue(Opt))
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++NumPositionalRequired;
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else if (ConsumeAfterOpt) {
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// ConsumeAfter cannot be combined with "optional" positional options
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// unless there is only one positional argument...
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if (PositionalOpts.size() > 2)
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ErrorParsing |=
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Opt->error(" error - this positional option will never be matched, "
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"because it does not Require a value, and a "
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"cl::ConsumeAfter option is active!");
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} else if (UnboundedFound) { // This option does not "require" a value...
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// Make sure this option is not specified after an option that eats all
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// extra arguments, or this one will never get any!
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//
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ErrorParsing |= Opt->error(" error - option can never match, because "
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"another positional argument will match an "
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"unbounded number of values, and this option"
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" does not require a value!");
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}
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UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
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}
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}
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// PositionalVals - A vector of "positional" arguments we accumulate into to
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// processes at the end...
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//
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std::vector<std::string> PositionalVals;
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// Loop over all of the arguments... processing them.
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bool DashDashFound = false; // Have we read '--'?
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for (int i = 1; i < argc; ++i) {
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Option *Handler = 0;
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const char *Value = "";
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const char *ArgName = "";
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// Check to see if this is a positional argument. This argument is
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// considered to be positional if it doesn't start with '-', if it is "-"
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// itself, or if we have seen "--" already.
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//
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if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
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// Positional argument!
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if (!PositionalOpts.empty()) {
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PositionalVals.push_back(argv[i]);
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// All of the positional arguments have been fulfulled, give the rest to
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// the consume after option... if it's specified...
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//
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if (PositionalVals.size() >= NumPositionalRequired &&
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ConsumeAfterOpt != 0) {
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for (++i; i < argc; ++i)
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PositionalVals.push_back(argv[i]);
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break; // Handle outside of the argument processing loop...
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}
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// Delay processing positional arguments until the end...
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continue;
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}
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} else { // We start with a '-', must be an argument...
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ArgName = argv[i]+1;
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while (*ArgName == '-') ++ArgName; // Eat leading dashes
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if (*ArgName == 0 && !DashDashFound) { // Is this the mythical "--"?
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DashDashFound = true; // Yup, take note of that fact...
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continue; // Don't try to process it as an argument iself.
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}
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const char *ArgNameEnd = ArgName;
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while (*ArgNameEnd && *ArgNameEnd != '=')
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++ArgNameEnd; // Scan till end of argument name...
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Value = ArgNameEnd;
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if (*Value) // If we have an equals sign...
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++Value; // Advance to value...
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if (*ArgName != 0) {
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std::string RealName(ArgName, ArgNameEnd);
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// Extract arg name part
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std::map<std::string, Option*>::iterator I = Opts.find(RealName);
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if (I == Opts.end() && !*Value && RealName.size() > 1) {
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// Check to see if this "option" is really a prefixed or grouped
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// argument...
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//
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unsigned Length = 0;
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Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping);
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// If the option is a prefixed option, then the value is simply the
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// rest of the name... so fall through to later processing, by
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// setting up the argument name flags and value fields.
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//
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if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
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ArgNameEnd = ArgName+Length;
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Value = ArgNameEnd;
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I = Opts.find(std::string(ArgName, ArgNameEnd));
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assert(I->second == PGOpt);
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} else if (PGOpt) {
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// This must be a grouped option... handle all of them now...
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assert(isGrouping(PGOpt) && "Broken getOptionPred!");
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do {
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// Move current arg name out of RealName into RealArgName...
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std::string RealArgName(RealName.begin(),RealName.begin()+Length);
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RealName.erase(RealName.begin(), RealName.begin()+Length);
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// Because ValueRequired is an invalid flag for grouped arguments,
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// we don't need to pass argc/argv in...
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//
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assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
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"Option can not be cl::Grouping AND cl::ValueRequired!");
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int Dummy;
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ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(), "",
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0, 0, Dummy);
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// Get the next grouping option...
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if (!RealName.empty())
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PGOpt = getOptionPred(RealName, Length, isGrouping);
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} while (!RealName.empty() && PGOpt);
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if (RealName.empty()) // Processed all of the options, move on
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continue; // to the next argv[] value...
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// If RealName is not empty, that means we did not match one of the
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// options! This is an error.
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//
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I = Opts.end();
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}
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}
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Handler = I != Opts.end() ? I->second : 0;
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}
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}
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if (Handler == 0) {
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std::cerr << "Unknown command line argument '" << argv[i] << "'. Try: "
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<< argv[0] << " --help'\n";
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ErrorParsing = true;
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continue;
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}
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// Check to see if this option accepts a comma separated list of values. If
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// it does, we have to split up the value into multiple values...
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if (Handler->getMiscFlags() & CommaSeparated) {
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std::string Val(Value);
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std::string::size_type Pos = Val.find(',');
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while (Pos != std::string::npos) {
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// Process the portion before the comma...
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ErrorParsing |= ProvideOption(Handler, ArgName,
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std::string(Val.begin(),
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Val.begin()+Pos).c_str(),
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argc, argv, i);
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// Erase the portion before the comma, AND the comma...
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Val.erase(Val.begin(), Val.begin()+Pos+1);
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Value += Pos+1; // Increment the original value pointer as well...
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// Check for another comma...
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Pos = Val.find(',');
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}
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}
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ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
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}
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// Check and handle positional arguments now...
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if (NumPositionalRequired > PositionalVals.size()) {
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std::cerr << "Not enough positional command line arguments specified!\n"
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<< "Must specify at least " << NumPositionalRequired
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<< " positional arguments: See: " << argv[0] << " --help\n";
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ErrorParsing = true;
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} else if (ConsumeAfterOpt == 0) {
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// Positional args have already been handled if ConsumeAfter is specified...
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unsigned ValNo = 0, NumVals = PositionalVals.size();
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for (unsigned i = 0, e = PositionalOpts.size(); i != e; ++i) {
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if (RequiresValue(PositionalOpts[i])) {
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ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
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--NumPositionalRequired; // We fulfilled our duty...
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}
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// If we _can_ give this option more arguments, do so now, as long as we
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// do not give it values that others need. 'Done' controls whether the
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// option even _WANTS_ any more.
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//
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bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
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while (NumVals-ValNo > NumPositionalRequired && !Done) {
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switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
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case cl::Optional:
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Done = true; // Optional arguments want _at most_ one value
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// FALL THROUGH
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case cl::ZeroOrMore: // Zero or more will take all they can get...
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case cl::OneOrMore: // One or more will take all they can get...
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ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
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break;
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default:
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assert(0 && "Internal error, unexpected NumOccurrences flag in "
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"positional argument processing!");
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}
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}
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}
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} else {
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assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
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unsigned ValNo = 0;
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for (unsigned j = 1, e = PositionalOpts.size(); j != e; ++j)
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if (RequiresValue(PositionalOpts[j]))
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ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
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PositionalVals[ValNo++]);
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// Handle the case where there is just one positional option, and it's
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// optional. In this case, we want to give JUST THE FIRST option to the
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// positional option and keep the rest for the consume after. The above
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// loop would have assigned no values to positional options in this case.
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//
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if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty())
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ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
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PositionalVals[ValNo++]);
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// Handle over all of the rest of the arguments to the
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// cl::ConsumeAfter command line option...
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for (; ValNo != PositionalVals.size(); ++ValNo)
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ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
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PositionalVals[ValNo]);
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}
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// Loop over args and make sure all required args are specified!
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for (std::map<std::string, Option*>::iterator I = Opts.begin(),
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E = Opts.end(); I != E; ++I) {
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switch (I->second->getNumOccurrencesFlag()) {
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case Required:
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case OneOrMore:
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if (I->second->getNumOccurrences() == 0) {
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I->second->error(" must be specified at least once!");
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ErrorParsing = true;
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}
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// Fall through
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default:
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break;
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}
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}
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// Free all of the memory allocated to the map. Command line options may only
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// be processed once!
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delete CommandLineOptions;
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CommandLineOptions = 0;
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PositionalOpts.clear();
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// If we had an error processing our arguments, don't let the program execute
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if (ErrorParsing) exit(1);
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}
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//===----------------------------------------------------------------------===//
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// Option Base class implementation
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//
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bool Option::error(std::string Message, const char *ArgName) {
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if (ArgName == 0) ArgName = ArgStr;
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if (ArgName[0] == 0)
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std::cerr << HelpStr; // Be nice for positional arguments
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else
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std::cerr << "-" << ArgName;
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std::cerr << " option" << Message << "\n";
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return true;
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}
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bool Option::addOccurrence(const char *ArgName, const std::string &Value) {
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NumOccurrences++; // Increment the number of times we have been seen
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switch (getNumOccurrencesFlag()) {
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case Optional:
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if (NumOccurrences > 1)
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return error(": may only occur zero or one times!", ArgName);
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break;
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case Required:
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if (NumOccurrences > 1)
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return error(": must occur exactly one time!", ArgName);
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// Fall through
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case OneOrMore:
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case ZeroOrMore:
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case ConsumeAfter: break;
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default: return error(": bad num occurrences flag value!");
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}
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return handleOccurrence(ArgName, Value);
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}
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// addArgument - Tell the system that this Option subclass will handle all
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// occurrences of -ArgStr on the command line.
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//
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void Option::addArgument(const char *ArgStr) {
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if (ArgStr[0])
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AddArgument(ArgStr, this);
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else if (getFormattingFlag() == Positional)
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getPositionalOpts().push_back(this);
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else if (getNumOccurrencesFlag() == ConsumeAfter) {
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assert((getPositionalOpts().empty() ||
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getPositionalOpts().front()->getNumOccurrencesFlag() != ConsumeAfter)
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&& "Cannot specify more than one option with cl::ConsumeAfter "
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"specified!");
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getPositionalOpts().insert(getPositionalOpts().begin(), this);
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}
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}
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void Option::removeArgument(const char *ArgStr) {
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if (ArgStr[0]) {
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RemoveArgument(ArgStr, this);
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} else if (getFormattingFlag() == Positional) {
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std::vector<Option*>::iterator I =
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std::find(getPositionalOpts().begin(), getPositionalOpts().end(), this);
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assert(I != getPositionalOpts().end() && "Arg not registered!");
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getPositionalOpts().erase(I);
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} else if (getNumOccurrencesFlag() == ConsumeAfter) {
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assert(!getPositionalOpts().empty() && getPositionalOpts()[0] == this &&
|
|
"Arg not registered correctly!");
|
|
getPositionalOpts().erase(getPositionalOpts().begin());
|
|
}
|
|
}
|
|
|
|
|
|
// getValueStr - Get the value description string, using "DefaultMsg" if nothing
|
|
// has been specified yet.
|
|
//
|
|
static const char *getValueStr(const Option &O, const char *DefaultMsg) {
|
|
if (O.ValueStr[0] == 0) return DefaultMsg;
|
|
return O.ValueStr;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// cl::alias class implementation
|
|
//
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned alias::getOptionWidth() const {
|
|
return std::strlen(ArgStr)+6;
|
|
}
|
|
|
|
// Print out the option for the alias...
|
|
void alias::printOptionInfo(unsigned GlobalWidth) const {
|
|
unsigned L = std::strlen(ArgStr);
|
|
std::cerr << " -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
|
|
<< HelpStr << "\n";
|
|
}
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Parser Implementation code...
|
|
//
|
|
|
|
// basic_parser implementation
|
|
//
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned basic_parser_impl::getOptionWidth(const Option &O) const {
|
|
unsigned Len = std::strlen(O.ArgStr);
|
|
if (const char *ValName = getValueName())
|
|
Len += std::strlen(getValueStr(O, ValName))+3;
|
|
|
|
return Len + 6;
|
|
}
|
|
|
|
// printOptionInfo - Print out information about this option. The
|
|
// to-be-maintained width is specified.
|
|
//
|
|
void basic_parser_impl::printOptionInfo(const Option &O,
|
|
unsigned GlobalWidth) const {
|
|
std::cerr << " -" << O.ArgStr;
|
|
|
|
if (const char *ValName = getValueName())
|
|
std::cerr << "=<" << getValueStr(O, ValName) << ">";
|
|
|
|
std::cerr << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
|
|
<< O.HelpStr << "\n";
|
|
}
|
|
|
|
|
|
|
|
|
|
// parser<bool> implementation
|
|
//
|
|
bool parser<bool>::parse(Option &O, const char *ArgName,
|
|
const std::string &Arg, bool &Value) {
|
|
if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
|
|
Arg == "1") {
|
|
Value = true;
|
|
} else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
|
|
Value = false;
|
|
} else {
|
|
return O.error(": '" + Arg +
|
|
"' is invalid value for boolean argument! Try 0 or 1");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// parser<int> implementation
|
|
//
|
|
bool parser<int>::parse(Option &O, const char *ArgName,
|
|
const std::string &Arg, int &Value) {
|
|
char *End;
|
|
Value = (int)strtol(Arg.c_str(), &End, 0);
|
|
if (*End != 0)
|
|
return O.error(": '" + Arg + "' value invalid for integer argument!");
|
|
return false;
|
|
}
|
|
|
|
// parser<unsigned> implementation
|
|
//
|
|
bool parser<unsigned>::parse(Option &O, const char *ArgName,
|
|
const std::string &Arg, unsigned &Value) {
|
|
char *End;
|
|
long long int V = strtoll(Arg.c_str(), &End, 0);
|
|
Value = (unsigned)V;
|
|
if (*End != 0 || V < 0 || Value != V)
|
|
return O.error(": '" + Arg + "' value invalid for uint argument!");
|
|
return false;
|
|
}
|
|
|
|
// parser<double>/parser<float> implementation
|
|
//
|
|
static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
|
|
const char *ArgStart = Arg.c_str();
|
|
char *End;
|
|
Value = strtod(ArgStart, &End);
|
|
if (*End != 0)
|
|
return O.error(": '" +Arg+ "' value invalid for floating point argument!");
|
|
return false;
|
|
}
|
|
|
|
bool parser<double>::parse(Option &O, const char *AN,
|
|
const std::string &Arg, double &Val) {
|
|
return parseDouble(O, Arg, Val);
|
|
}
|
|
|
|
bool parser<float>::parse(Option &O, const char *AN,
|
|
const std::string &Arg, float &Val) {
|
|
double dVal;
|
|
if (parseDouble(O, Arg, dVal))
|
|
return true;
|
|
Val = (float)dVal;
|
|
return false;
|
|
}
|
|
|
|
|
|
|
|
// generic_parser_base implementation
|
|
//
|
|
|
|
// findOption - Return the option number corresponding to the specified
|
|
// argument string. If the option is not found, getNumOptions() is returned.
|
|
//
|
|
unsigned generic_parser_base::findOption(const char *Name) {
|
|
unsigned i = 0, e = getNumOptions();
|
|
std::string N(Name);
|
|
|
|
while (i != e)
|
|
if (getOption(i) == N)
|
|
return i;
|
|
else
|
|
++i;
|
|
return e;
|
|
}
|
|
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned generic_parser_base::getOptionWidth(const Option &O) const {
|
|
if (O.hasArgStr()) {
|
|
unsigned Size = std::strlen(O.ArgStr)+6;
|
|
for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
|
|
Size = std::max(Size, (unsigned)std::strlen(getOption(i))+8);
|
|
return Size;
|
|
} else {
|
|
unsigned BaseSize = 0;
|
|
for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
|
|
BaseSize = std::max(BaseSize, (unsigned)std::strlen(getOption(i))+8);
|
|
return BaseSize;
|
|
}
|
|
}
|
|
|
|
// printOptionInfo - Print out information about this option. The
|
|
// to-be-maintained width is specified.
|
|
//
|
|
void generic_parser_base::printOptionInfo(const Option &O,
|
|
unsigned GlobalWidth) const {
|
|
if (O.hasArgStr()) {
|
|
unsigned L = std::strlen(O.ArgStr);
|
|
std::cerr << " -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
|
|
<< " - " << O.HelpStr << "\n";
|
|
|
|
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
|
|
unsigned NumSpaces = GlobalWidth-strlen(getOption(i))-8;
|
|
std::cerr << " =" << getOption(i) << std::string(NumSpaces, ' ')
|
|
<< " - " << getDescription(i) << "\n";
|
|
}
|
|
} else {
|
|
if (O.HelpStr[0])
|
|
std::cerr << " " << O.HelpStr << "\n";
|
|
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
|
|
unsigned L = std::strlen(getOption(i));
|
|
std::cerr << " -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
|
|
<< " - " << getDescription(i) << "\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// --help and --help-hidden option implementation
|
|
//
|
|
namespace {
|
|
|
|
class HelpPrinter {
|
|
unsigned MaxArgLen;
|
|
const Option *EmptyArg;
|
|
const bool ShowHidden;
|
|
|
|
// isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
|
|
inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
|
|
return OptPair.second->getOptionHiddenFlag() >= Hidden;
|
|
}
|
|
inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
|
|
return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
|
|
}
|
|
|
|
public:
|
|
HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
|
|
EmptyArg = 0;
|
|
}
|
|
|
|
void operator=(bool Value) {
|
|
if (Value == false) return;
|
|
|
|
// Copy Options into a vector so we can sort them as we like...
|
|
std::vector<std::pair<std::string, Option*> > Options;
|
|
copy(getOpts().begin(), getOpts().end(), std::back_inserter(Options));
|
|
|
|
// Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
|
|
Options.erase(std::remove_if(Options.begin(), Options.end(),
|
|
std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
|
|
Options.end());
|
|
|
|
// Eliminate duplicate entries in table (from enum flags options, f.e.)
|
|
{ // Give OptionSet a scope
|
|
std::set<Option*> OptionSet;
|
|
for (unsigned i = 0; i != Options.size(); ++i)
|
|
if (OptionSet.count(Options[i].second) == 0)
|
|
OptionSet.insert(Options[i].second); // Add new entry to set
|
|
else
|
|
Options.erase(Options.begin()+i--); // Erase duplicate
|
|
}
|
|
|
|
if (ProgramOverview)
|
|
std::cerr << "OVERVIEW:" << ProgramOverview << "\n";
|
|
|
|
std::cerr << "USAGE: " << ProgramName << " [options]";
|
|
|
|
// Print out the positional options...
|
|
std::vector<Option*> &PosOpts = getPositionalOpts();
|
|
Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
|
|
if (!PosOpts.empty() && PosOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
|
|
CAOpt = PosOpts[0];
|
|
|
|
for (unsigned i = CAOpt != 0, e = PosOpts.size(); i != e; ++i)
|
|
std::cerr << " " << PosOpts[i]->HelpStr;
|
|
|
|
// Print the consume after option info if it exists...
|
|
if (CAOpt) std::cerr << " " << CAOpt->HelpStr;
|
|
|
|
std::cerr << "\n\n";
|
|
|
|
// Compute the maximum argument length...
|
|
MaxArgLen = 0;
|
|
for (unsigned i = 0, e = Options.size(); i != e; ++i)
|
|
MaxArgLen = std::max(MaxArgLen, Options[i].second->getOptionWidth());
|
|
|
|
std::cerr << "OPTIONS:\n";
|
|
for (unsigned i = 0, e = Options.size(); i != e; ++i)
|
|
Options[i].second->printOptionInfo(MaxArgLen);
|
|
|
|
// Halt the program if help information is printed
|
|
exit(1);
|
|
}
|
|
};
|
|
|
|
|
|
|
|
// Define the two HelpPrinter instances that are used to print out help, or
|
|
// help-hidden...
|
|
//
|
|
HelpPrinter NormalPrinter(false);
|
|
HelpPrinter HiddenPrinter(true);
|
|
|
|
cl::opt<HelpPrinter, true, parser<bool> >
|
|
HOp("help", cl::desc("display available options (--help-hidden for more)"),
|
|
cl::location(NormalPrinter), cl::ValueDisallowed);
|
|
|
|
cl::opt<HelpPrinter, true, parser<bool> >
|
|
HHOp("help-hidden", cl::desc("display all available options"),
|
|
cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
|
|
|
|
} // End anonymous namespace
|