418 lines
13 KiB
C++
418 lines
13 KiB
C++
//===-- CommandLine.cpp - Command line parser implementation --------------===//
|
|
//
|
|
// This class implements a command line argument processor that is useful when
|
|
// creating a tool. It provides a simple, minimalistic interface that is easily
|
|
// extensible and supports nonlocal (library) command line options.
|
|
//
|
|
// Note that rather than trying to figure out what this code does, you could try
|
|
// reading the library documentation located in docs/CommandLine.html
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/STLExtras.h"
|
|
#include <vector>
|
|
#include <algorithm>
|
|
#include <map>
|
|
#include <set>
|
|
using namespace cl;
|
|
|
|
// Return the global command line option vector. Making it a function scoped
|
|
// static ensures that it will be initialized before its first use correctly.
|
|
//
|
|
static map<string, Option*> &getOpts() {
|
|
static map<string,Option*> CommandLineOptions;
|
|
return CommandLineOptions;
|
|
}
|
|
|
|
static void AddArgument(const string &ArgName, Option *Opt) {
|
|
if (getOpts().find(ArgName) != getOpts().end()) {
|
|
cerr << "CommandLine Error: Argument '" << ArgName
|
|
<< "' specified more than once!\n";
|
|
} else {
|
|
getOpts()[ArgName] = Opt; // Add argument to the argument map!
|
|
}
|
|
}
|
|
|
|
static const char *ProgramName = 0;
|
|
static const char *ProgramOverview = 0;
|
|
|
|
void cl::ParseCommandLineOptions(int &argc, char **argv,
|
|
const char *Overview = 0) {
|
|
ProgramName = argv[0]; // Save this away safe and snug
|
|
ProgramOverview = Overview;
|
|
bool ErrorParsing = false;
|
|
|
|
// Loop over all of the arguments... processing them.
|
|
for (int i = 1; i < argc; ++i) {
|
|
Option *Handler = 0;
|
|
const char *Value = "";
|
|
const char *ArgName = "";
|
|
if (argv[i][0] != '-') { // Unnamed argument?
|
|
map<string, Option*>::iterator I = getOpts().find("");
|
|
Handler = I != getOpts().end() ? I->second : 0;
|
|
Value = argv[i];
|
|
} else { // We start with a - or --, eat dashes
|
|
ArgName = argv[i]+1;
|
|
while (*ArgName == '-') ++ArgName; // Eat leading dashes
|
|
|
|
const char *ArgNameEnd = ArgName;
|
|
while (*ArgNameEnd && *ArgNameEnd != '=') ++ArgNameEnd; // Scan till end
|
|
|
|
Value = ArgNameEnd;
|
|
if (*Value) // If we have an equals sign...
|
|
++Value; // Advance to value...
|
|
|
|
if (*ArgName != 0) {
|
|
// Extract arg name part
|
|
map<string, Option*>::iterator I = getOpts().find(string(ArgName, ArgNameEnd));
|
|
Handler = I != getOpts().end() ? I->second : 0;
|
|
}
|
|
}
|
|
|
|
if (Handler == 0) {
|
|
cerr << "Unknown command line argument '" << argv[i] << "'. Try: "
|
|
<< argv[0] << " --help\n'";
|
|
ErrorParsing = true;
|
|
continue;
|
|
}
|
|
|
|
// Enforce value requirements
|
|
switch (Handler->getValueExpectedFlag()) {
|
|
case ValueRequired:
|
|
if (Value == 0 || *Value == 0) { // No value specified?
|
|
if (i+1 < argc) { // Steal the next argument, like for '-o filename'
|
|
Value = argv[++i];
|
|
} else {
|
|
ErrorParsing = Handler->error(" requires a value!");
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
case ValueDisallowed:
|
|
if (*Value != 0) {
|
|
ErrorParsing = Handler->error(" does not allow a value! '" +
|
|
string(Value) + "' specified.");
|
|
continue;
|
|
}
|
|
break;
|
|
case ValueOptional: break;
|
|
default: cerr << "Bad ValueMask flag! CommandLine usage error:"
|
|
<< Handler->getValueExpectedFlag() << endl; abort();
|
|
}
|
|
|
|
// Run the handler now!
|
|
ErrorParsing |= Handler->addOccurance(ArgName, Value);
|
|
}
|
|
|
|
// Loop over args and make sure all required args are specified!
|
|
for (map<string, Option*>::iterator I = getOpts().begin(),
|
|
E = getOpts().end(); I != E; ++I) {
|
|
switch (I->second->getNumOccurancesFlag()) {
|
|
case Required:
|
|
case OneOrMore:
|
|
if (I->second->getNumOccurances() == 0)
|
|
I->second->error(" must be specified at least once!");
|
|
// Fall through
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Free all of the memory allocated to the vector. Command line options may
|
|
// only be processed once!
|
|
getOpts().clear();
|
|
|
|
// If we had an error processing our arguments, don't let the program execute
|
|
if (ErrorParsing) exit(1);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Option Base class implementation
|
|
//
|
|
Option::Option(const char *argStr, const char *helpStr, int flags)
|
|
: NumOccurances(0), Flags(flags), ArgStr(argStr), HelpStr(helpStr) {
|
|
AddArgument(ArgStr, this);
|
|
}
|
|
|
|
bool Option::error(string Message, const char *ArgName = 0) {
|
|
if (ArgName == 0) ArgName = ArgStr;
|
|
cerr << "-" << ArgName << " option" << Message << endl;
|
|
return true;
|
|
}
|
|
|
|
bool Option::addOccurance(const char *ArgName, const string &Value) {
|
|
NumOccurances++; // Increment the number of times we have been seen
|
|
|
|
switch (getNumOccurancesFlag()) {
|
|
case Optional:
|
|
if (NumOccurances > 1)
|
|
return error(": may only occur zero or one times!", ArgName);
|
|
break;
|
|
case Required:
|
|
if (NumOccurances > 1)
|
|
return error(": must occur exactly one time!", ArgName);
|
|
// Fall through
|
|
case OneOrMore:
|
|
case ZeroOrMore: break;
|
|
default: return error(": bad num occurances flag value!");
|
|
}
|
|
|
|
return handleOccurance(ArgName, Value);
|
|
}
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned Option::getOptionWidth() const {
|
|
return std::strlen(ArgStr)+6;
|
|
}
|
|
|
|
void Option::printOptionInfo(unsigned GlobalWidth) const {
|
|
unsigned L = std::strlen(ArgStr);
|
|
if (L == 0) return; // Don't print the empty arg like this!
|
|
cerr << " -" << ArgStr << string(GlobalWidth-L-6, ' ') << " - "
|
|
<< HelpStr << endl;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Boolean/flag command line option implementation
|
|
//
|
|
|
|
bool Flag::handleOccurance(const char *ArgName, const string &Arg) {
|
|
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 error(": '" + Arg + "' is invalid value for boolean argument! Try 0 or 1");
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Integer valued command line option implementation
|
|
//
|
|
bool Int::handleOccurance(const char *ArgName, const string &Arg) {
|
|
const char *ArgStart = Arg.c_str();
|
|
char *End;
|
|
Value = (int)strtol(ArgStart, &End, 0);
|
|
if (*End != 0)
|
|
return error(": '" + Arg + "' value invalid for integer argument!");
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// String valued command line option implementation
|
|
//
|
|
bool String::handleOccurance(const char *ArgName, const string &Arg) {
|
|
*this = Arg;
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Enum valued command line option implementation
|
|
//
|
|
void EnumBase::processValues(va_list Vals) {
|
|
while (const char *EnumName = va_arg(Vals, const char *)) {
|
|
int EnumVal = va_arg(Vals, int);
|
|
const char *EnumDesc = va_arg(Vals, const char *);
|
|
ValueMap.push_back(make_pair(EnumName, // Add value to value map
|
|
make_pair(EnumVal, EnumDesc)));
|
|
}
|
|
}
|
|
|
|
// registerArgs - notify the system about these new arguments
|
|
void EnumBase::registerArgs() {
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
AddArgument(ValueMap[i].first, this);
|
|
}
|
|
|
|
const char *EnumBase::getArgName(int ID) const {
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
if (ID == ValueMap[i].second.first) return ValueMap[i].first;
|
|
return "";
|
|
}
|
|
const char *EnumBase::getArgDescription(int ID) const {
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
if (ID == ValueMap[i].second.first) return ValueMap[i].second.second;
|
|
return "";
|
|
}
|
|
|
|
|
|
|
|
bool EnumValueBase::handleOccurance(const char *ArgName, const string &Arg) {
|
|
unsigned i;
|
|
for (i = 0; i < ValueMap.size(); ++i)
|
|
if (ValueMap[i].first == Arg) break;
|
|
if (i == ValueMap.size())
|
|
return error(": unrecognized alternative '"+Arg+"'!");
|
|
Value = ValueMap[i].second.first;
|
|
return false;
|
|
}
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned EnumValueBase::getOptionWidth() const {
|
|
unsigned BaseSize = Option::getOptionWidth();
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+8);
|
|
return BaseSize;
|
|
}
|
|
|
|
// printOptionInfo - Print out information about this option. The
|
|
// to-be-maintained width is specified.
|
|
//
|
|
void EnumValueBase::printOptionInfo(unsigned GlobalWidth) const {
|
|
Option::printOptionInfo(GlobalWidth);
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i) {
|
|
unsigned NumSpaces = GlobalWidth-strlen(ValueMap[i].first)-8;
|
|
cerr << " =" << ValueMap[i].first << string(NumSpaces, ' ') << " - "
|
|
<< ValueMap[i].second.second;
|
|
|
|
if (i == 0) cerr << " (default)";
|
|
cerr << endl;
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Enum flags command line option implementation
|
|
//
|
|
|
|
bool EnumFlagsBase::handleOccurance(const char *ArgName, const string &Arg) {
|
|
return EnumValueBase::handleOccurance("", ArgName);
|
|
}
|
|
|
|
unsigned EnumFlagsBase::getOptionWidth() const {
|
|
unsigned BaseSize = 0;
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+6);
|
|
return BaseSize;
|
|
}
|
|
|
|
void EnumFlagsBase::printOptionInfo(unsigned GlobalWidth) const {
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i) {
|
|
unsigned L = std::strlen(ValueMap[i].first);
|
|
cerr << " -" << ValueMap[i].first << string(GlobalWidth-L-6, ' ') << " - "
|
|
<< ValueMap[i].second.second;
|
|
if (i == 0) cerr << " (default)";
|
|
cerr << endl;
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Enum list command line option implementation
|
|
//
|
|
|
|
bool EnumListBase::handleOccurance(const char *ArgName, const string &Arg) {
|
|
unsigned i;
|
|
for (i = 0; i < ValueMap.size(); ++i)
|
|
if (ValueMap[i].first == string(ArgName)) break;
|
|
if (i == ValueMap.size())
|
|
return error(": CommandLine INTERNAL ERROR", ArgName);
|
|
Values.push_back(ValueMap[i].second.first);
|
|
return false;
|
|
}
|
|
|
|
// Return the width of the option tag for printing...
|
|
unsigned EnumListBase::getOptionWidth() const {
|
|
unsigned BaseSize = 0;
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i)
|
|
BaseSize = max(BaseSize, std::strlen(ValueMap[i].first)+6);
|
|
return BaseSize;
|
|
}
|
|
|
|
|
|
// printOptionInfo - Print out information about this option. The
|
|
// to-be-maintained width is specified.
|
|
//
|
|
void EnumListBase::printOptionInfo(unsigned GlobalWidth) const {
|
|
for (unsigned i = 0; i < ValueMap.size(); ++i) {
|
|
unsigned L = std::strlen(ValueMap[i].first);
|
|
cerr << " -" << ValueMap[i].first << string(GlobalWidth-L-6, ' ') << " - "
|
|
<< ValueMap[i].second.second << endl;
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Help option... always automatically provided.
|
|
//
|
|
namespace {
|
|
|
|
// isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
|
|
inline bool isHidden(pair<string, Option *> &OptPair) {
|
|
return OptPair.second->getOptionHiddenFlag() >= Hidden;
|
|
}
|
|
inline bool isReallyHidden(pair<string, Option *> &OptPair) {
|
|
return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
|
|
}
|
|
|
|
class Help : public Option {
|
|
unsigned MaxArgLen;
|
|
const Option *EmptyArg;
|
|
const bool ShowHidden;
|
|
|
|
virtual bool handleOccurance(const char *ArgName, const string &Arg) {
|
|
// Copy Options into a vector so we can sort them as we like...
|
|
vector<pair<string, Option*> > Options;
|
|
copy(getOpts().begin(), getOpts().end(), back_inserter(Options));
|
|
|
|
// Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
|
|
Options.erase(remove_if(Options.begin(), Options.end(),
|
|
ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
|
|
Options.end());
|
|
|
|
// Eliminate duplicate entries in table (from enum flags options, f.e.)
|
|
set<Option*> OptionSet;
|
|
for (unsigned i = 0; i < Options.size(); )
|
|
if (OptionSet.count(Options[i].second) == 0)
|
|
OptionSet.insert(Options[i++].second); // Add to set
|
|
else
|
|
Options.erase(Options.begin()+i); // Erase duplicate
|
|
|
|
|
|
if (ProgramOverview)
|
|
cerr << "OVERVIEW:" << ProgramOverview << endl;
|
|
// TODO: Sort options by some criteria
|
|
|
|
cerr << "USAGE: " << ProgramName << " [options]\n\n";
|
|
// TODO: print usage nicer
|
|
|
|
// Compute the maximum argument length...
|
|
MaxArgLen = 0;
|
|
for_each(Options.begin(), Options.end(),
|
|
bind_obj(this, &Help::getMaxArgLen));
|
|
|
|
cerr << "OPTIONS:\n";
|
|
for_each(Options.begin(), Options.end(),
|
|
bind_obj(this, &Help::printOption));
|
|
|
|
return true; // Displaying help is cause to terminate the program
|
|
}
|
|
|
|
void getMaxArgLen(pair<string, Option *> OptPair) {
|
|
const Option *Opt = OptPair.second;
|
|
if (Opt->ArgStr[0] == 0) EmptyArg = Opt; // Capture the empty arg if exists
|
|
MaxArgLen = max(MaxArgLen, Opt->getOptionWidth());
|
|
}
|
|
|
|
void printOption(pair<string, Option *> OptPair) {
|
|
const Option *Opt = OptPair.second;
|
|
Opt->printOptionInfo(MaxArgLen);
|
|
}
|
|
|
|
public:
|
|
inline Help(const char *ArgVal, const char *HelpVal, bool showHidden)
|
|
: Option(ArgVal, HelpVal, showHidden ? Hidden : 0), ShowHidden(showHidden) {
|
|
EmptyArg = 0;
|
|
}
|
|
};
|
|
|
|
Help HelpOp("help", "display available options"
|
|
" (--help-hidden for more)", false);
|
|
Help HelpHiddenOpt("help-hidden", "display all available options", true);
|
|
|
|
} // End anonymous namespace
|