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Support/CommandLine: Add "Did you mean" print for mismatched operands. 

llvm-svn: 123717
This commit is contained in:
Daniel Dunbar 2011-01-18 01:59:24 +00:00
parent bda4e5eb33
commit f413213a48
1 changed files with 39 additions and 0 deletions
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39
llvm/lib/Support/CommandLine.cpp
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@ -180,6 +180,34 @@ static Option *LookupOption(StringRef &Arg, StringRef &Value,
return I->second;
}
/// LookupNearestOption - Lookup the closest match to the option specified by
/// the specified option on the command line. If there is a value specified
/// (after an equal sign) return that as well. This assumes that leading dashes
/// have already been stripped.
static Option *LookupNearestOption(StringRef Arg,
const StringMap<Option*> &OptionsMap) {
// Reject all dashes.
if (Arg.empty()) return 0;
// Split on any equal sign.
StringRef LHS = Arg.split('=').first;
// Find the closest match.
Option *Best = 0;
unsigned BestDistance = 0;
for (StringMap<Option*>::const_iterator it = OptionsMap.begin(),
ie = OptionsMap.end(); it != ie; ++it) {
unsigned Distance = StringRef(it->second->ArgStr).edit_distance(
Arg, /*AllowReplacements=*/true, /*MaxEditDistance=*/BestDistance);
if (!Best || Distance < BestDistance) {
Best = it->second;
BestDistance = Distance;
}
}
return Best;
}
/// CommaSeparateAndAddOccurence - A wrapper around Handler->addOccurence() that
/// does special handling of cl::CommaSeparated options.
static bool CommaSeparateAndAddOccurence(Option *Handler, unsigned pos,
@ -571,6 +599,7 @@ void cl::ParseCommandLineOptions(int argc, char **argv,
bool DashDashFound = false; // Have we read '--'?
for (int i = 1; i < argc; ++i) {
Option *Handler = 0;
Option *NearestHandler = 0;
StringRef Value;
StringRef ArgName = "";
@ -644,12 +673,22 @@ void cl::ParseCommandLineOptions(int argc, char **argv,
if (Handler == 0)
Handler = HandlePrefixedOrGroupedOption(ArgName, Value,
ErrorParsing, Opts);
// Otherwise, look for the closest available option to report to the user
// in the upcoming error.
if (Handler == 0 && SinkOpts.empty())
NearestHandler = LookupNearestOption(ArgName, Opts);
}
if (Handler == 0) {
if (SinkOpts.empty()) {
errs() << ProgramName << ": Unknown command line argument '"
<< argv[i] << "'. Try: '" << argv[0] << " -help'\n";
// If we know a near match, report it as well.
errs() << ProgramName << ": Did you mean '-"
<< NearestHandler->ArgStr << "'?\n";
ErrorParsing = true;
} else {
for (SmallVectorImpl<Option*>::iterator I = SinkOpts.begin(),