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caccd761a6
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@986 91177308-0d34-0410-b5e6-96231b3b80d8
443 lines
14 KiB
C++
443 lines
14 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 "llvm/Support/CommandLine.h"
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#include "llvm/Support/STLExtras.h"
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#include <vector>
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#include <algorithm>
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#include <map>
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#include <set>
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using namespace cl;
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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 before its first use correctly.
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//
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static map<string, Option*> &getOpts() {
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static map<string,Option*> CommandLineOptions;
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return CommandLineOptions;
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}
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static void AddArgument(const string &ArgName, Option *Opt) {
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if (getOpts().find(ArgName) != getOpts().end()) {
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cerr << "CommandLine Error: Argument '" << ArgName
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<< "' specified more than once!\n";
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} else {
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getOpts()[ArgName] = Opt; // Add argument to the argument map!
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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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string(Value) + "' specified.");
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break;
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case ValueOptional: break;
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default: cerr << "Bad ValueMask flag! CommandLine usage error:"
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<< Handler->getValueExpectedFlag() << endl; abort();
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}
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// Run the handler now!
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return Handler->addOccurance(ArgName, Value);
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}
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void cl::ParseCommandLineOptions(int &argc, char **argv,
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const char *Overview = 0) {
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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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// Loop over all of the arguments... processing them.
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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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if (argv[i][0] != '-') { // Unnamed argument?
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map<string, Option*>::iterator I = getOpts().find("");
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Handler = I != getOpts().end() ? I->second : 0;
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Value = argv[i];
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} else { // We start with a - or --, eat dashes
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ArgName = argv[i]+1;
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while (*ArgName == '-') ++ArgName; // Eat leading dashes
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const char *ArgNameEnd = ArgName;
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while (*ArgNameEnd && *ArgNameEnd != '=' &&
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*ArgNameEnd != '/') ++ArgNameEnd; // Scan till end
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// TODO: Remove '/' case. Implement single letter args properly!
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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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// Extract arg name part
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map<string, Option*>::iterator I =
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getOpts().find(string(ArgName, ArgNameEnd));
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Handler = I != getOpts().end() ? I->second : 0;
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}
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}
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if (Handler == 0) {
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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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ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
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// If this option should consume all arguments that come after it...
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if (Handler->getNumOccurancesFlag() == ConsumeAfter) {
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for (++i; i < argc; ++i)
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ErrorParsing |= ProvideOption(Handler, ArgName, argv[i], argc, argv, i);
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}
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}
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// Loop over args and make sure all required args are specified!
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for (map<string, Option*>::iterator I = getOpts().begin(),
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E = getOpts().end(); I != E; ++I) {
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switch (I->second->getNumOccurancesFlag()) {
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case Required:
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case OneOrMore:
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if (I->second->getNumOccurances() == 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 vector. Command line options may
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// only be processed once!
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getOpts().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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Option::Option(const char *argStr, const char *helpStr, int flags)
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: NumOccurances(0), Flags(flags), ArgStr(argStr), HelpStr(helpStr) {
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AddArgument(ArgStr, this);
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}
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bool Option::error(string Message, const char *ArgName = 0) {
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if (ArgName == 0) ArgName = ArgStr;
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cerr << "-" << ArgName << " option" << Message << endl;
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return true;
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}
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bool Option::addOccurance(const char *ArgName, const string &Value) {
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NumOccurances++; // Increment the number of times we have been seen
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switch (getNumOccurancesFlag()) {
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case Optional:
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if (NumOccurances > 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 (NumOccurances > 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 occurances flag value!");
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}
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return handleOccurance(ArgName, Value);
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}
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// Return the width of the option tag for printing...
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unsigned Option::getOptionWidth() const {
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return std::strlen(ArgStr)+6;
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}
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void Option::printOptionInfo(unsigned GlobalWidth) const {
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unsigned L = std::strlen(ArgStr);
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if (L == 0) return; // Don't print the empty arg like this!
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cerr << " -" << ArgStr << string(GlobalWidth-L-6, ' ') << " - "
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<< HelpStr << endl;
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}
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//===----------------------------------------------------------------------===//
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// Boolean/flag command line option implementation
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//
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bool Flag::handleOccurance(const char *ArgName, const string &Arg) {
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if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
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Arg == "1") {
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Value = true;
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} else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
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Value = false;
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} else {
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return error(": '" + Arg +
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"' is invalid value for boolean argument! Try 0 or 1");
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}
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return false;
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}
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//===----------------------------------------------------------------------===//
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// Integer valued command line option implementation
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//
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bool Int::handleOccurance(const char *ArgName, const string &Arg) {
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const char *ArgStart = Arg.c_str();
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char *End;
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Value = (int)strtol(ArgStart, &End, 0);
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if (*End != 0)
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return error(": '" + Arg + "' value invalid for integer argument!");
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return false;
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}
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//===----------------------------------------------------------------------===//
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// String valued command line option implementation
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//
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bool String::handleOccurance(const char *ArgName, const string &Arg) {
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*this = Arg;
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return false;
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}
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//===----------------------------------------------------------------------===//
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// StringList valued command line option implementation
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//
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bool StringList::handleOccurance(const char *ArgName, const string &Arg) {
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push_back(Arg);
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return false;
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}
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//===----------------------------------------------------------------------===//
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// Enum valued command line option implementation
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//
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void EnumBase::processValues(va_list Vals) {
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while (const char *EnumName = va_arg(Vals, const char *)) {
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int EnumVal = va_arg(Vals, int);
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const char *EnumDesc = va_arg(Vals, const char *);
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ValueMap.push_back(make_pair(EnumName, // Add value to value map
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make_pair(EnumVal, EnumDesc)));
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}
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}
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// registerArgs - notify the system about these new arguments
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void EnumBase::registerArgs() {
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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AddArgument(ValueMap[i].first, this);
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}
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const char *EnumBase::getArgName(int ID) const {
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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if (ID == ValueMap[i].second.first) return ValueMap[i].first;
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return "";
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}
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const char *EnumBase::getArgDescription(int ID) const {
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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if (ID == ValueMap[i].second.first) return ValueMap[i].second.second;
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return "";
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}
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bool EnumValueBase::handleOccurance(const char *ArgName, const string &Arg) {
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unsigned i;
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for (i = 0; i < ValueMap.size(); ++i)
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if (ValueMap[i].first == Arg) break;
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if (i == ValueMap.size())
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return error(": unrecognized alternative '"+Arg+"'!");
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Value = ValueMap[i].second.first;
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return false;
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}
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// Return the width of the option tag for printing...
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unsigned EnumValueBase::getOptionWidth() const {
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unsigned BaseSize = Option::getOptionWidth();
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+8);
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return BaseSize;
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}
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// printOptionInfo - Print out information about this option. The
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// to-be-maintained width is specified.
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//
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void EnumValueBase::printOptionInfo(unsigned GlobalWidth) const {
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Option::printOptionInfo(GlobalWidth);
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for (unsigned i = 0; i < ValueMap.size(); ++i) {
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unsigned NumSpaces = GlobalWidth-strlen(ValueMap[i].first)-8;
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cerr << " =" << ValueMap[i].first << string(NumSpaces, ' ') << " - "
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<< ValueMap[i].second.second;
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if (i == 0) cerr << " (default)";
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cerr << endl;
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}
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}
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//===----------------------------------------------------------------------===//
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// Enum flags command line option implementation
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//
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bool EnumFlagsBase::handleOccurance(const char *ArgName, const string &Arg) {
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return EnumValueBase::handleOccurance("", ArgName);
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}
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unsigned EnumFlagsBase::getOptionWidth() const {
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unsigned BaseSize = 0;
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+6);
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return BaseSize;
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}
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void EnumFlagsBase::printOptionInfo(unsigned GlobalWidth) const {
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for (unsigned i = 0; i < ValueMap.size(); ++i) {
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unsigned L = std::strlen(ValueMap[i].first);
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cerr << " -" << ValueMap[i].first << string(GlobalWidth-L-6, ' ') << " - "
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<< ValueMap[i].second.second;
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if (i == 0) cerr << " (default)";
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cerr << endl;
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}
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}
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//===----------------------------------------------------------------------===//
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// Enum list command line option implementation
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//
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bool EnumListBase::handleOccurance(const char *ArgName, const string &Arg) {
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unsigned i;
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for (i = 0; i < ValueMap.size(); ++i)
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if (ValueMap[i].first == string(ArgName)) break;
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if (i == ValueMap.size())
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return error(": CommandLine INTERNAL ERROR", ArgName);
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Values.push_back(ValueMap[i].second.first);
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return false;
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}
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// Return the width of the option tag for printing...
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unsigned EnumListBase::getOptionWidth() const {
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unsigned BaseSize = 0;
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for (unsigned i = 0; i < ValueMap.size(); ++i)
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BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+6);
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return BaseSize;
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}
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// printOptionInfo - Print out information about this option. The
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// to-be-maintained width is specified.
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//
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void EnumListBase::printOptionInfo(unsigned GlobalWidth) const {
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for (unsigned i = 0; i < ValueMap.size(); ++i) {
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unsigned L = std::strlen(ValueMap[i].first);
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cerr << " -" << ValueMap[i].first << string(GlobalWidth-L-6, ' ') << " - "
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<< ValueMap[i].second.second << endl;
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}
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}
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//===----------------------------------------------------------------------===//
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// Help option... always automatically provided.
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//
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namespace {
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// isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
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inline bool isHidden(pair<string, Option *> &OptPair) {
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return OptPair.second->getOptionHiddenFlag() >= Hidden;
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}
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inline bool isReallyHidden(pair<string, Option *> &OptPair) {
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return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
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}
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class Help : public Option {
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unsigned MaxArgLen;
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const Option *EmptyArg;
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const bool ShowHidden;
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virtual bool handleOccurance(const char *ArgName, const string &Arg) {
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// Copy Options into a vector so we can sort them as we like...
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vector<pair<string, Option*> > Options;
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copy(getOpts().begin(), getOpts().end(), back_inserter(Options));
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// Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
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Options.erase(remove_if(Options.begin(), Options.end(),
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ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
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Options.end());
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// Eliminate duplicate entries in table (from enum flags options, f.e.)
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set<Option*> OptionSet;
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for (unsigned i = 0; i < Options.size(); )
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if (OptionSet.count(Options[i].second) == 0)
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OptionSet.insert(Options[i++].second); // Add to set
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else
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Options.erase(Options.begin()+i); // Erase duplicate
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if (ProgramOverview)
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cerr << "OVERVIEW:" << ProgramOverview << endl;
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// TODO: Sort options by some criteria
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cerr << "USAGE: " << ProgramName << " [options]\n\n";
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// TODO: print usage nicer
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// Compute the maximum argument length...
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MaxArgLen = 0;
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for_each(Options.begin(), Options.end(),
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bind_obj(this, &Help::getMaxArgLen));
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cerr << "OPTIONS:\n";
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for_each(Options.begin(), Options.end(),
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bind_obj(this, &Help::printOption));
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return true; // Displaying help is cause to terminate the program
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}
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void getMaxArgLen(pair<string, Option *> OptPair) {
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const Option *Opt = OptPair.second;
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if (Opt->ArgStr[0] == 0) EmptyArg = Opt; // Capture the empty arg if exists
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MaxArgLen = max(MaxArgLen, Opt->getOptionWidth());
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}
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void printOption(pair<string, Option *> OptPair) {
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const Option *Opt = OptPair.second;
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Opt->printOptionInfo(MaxArgLen);
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}
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public:
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inline Help(const char *ArgVal, const char *HelpVal, bool showHidden)
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: Option(ArgVal, HelpVal, showHidden ? Hidden : 0), ShowHidden(showHidden) {
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EmptyArg = 0;
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}
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};
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Help HelpOp("help", "display available options"
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" (--help-hidden for more)", false);
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Help HelpHiddenOpt("help-hidden", "display all available options", true);
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} // End anonymous namespace
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