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[Option] For typo '-foo', suggest '--foo'

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Summary:
https://reviews.llvm.org/rL321877 introduced the `OptTable::findNearest`
method, to find the closest edit distance option for a given string.
However, the implementation contained a bug: for a typo `-foo` with an
edit distance of 1 away from a valid option `--foo`, `findNearest`
would suggest a nearby option of `foo`. That is, the result would not
include the `--` prefix, and so was not a valid option.

Fix the bug by ensuring that the prefix string is initialized to one of
the valid prefixes for the option.

Test Plan: `check-llvm-unit`

Reviewers: v.g.vassilev, teemperor, ruiu, jroelofs, yamaguchi

Reviewed By: jroelofs

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D41873

llvm-svn: 322109
This commit is contained in:
Brian Gesiak 2018-01-09 19:38:04 +00:00
parent 0f0fe4383d
commit 6abdbd7d39
3 changed files with 5 additions and 2 deletions
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4
lib/Option/OptTable.cpp
View File

@ -277,8 +277,8 @@ unsigned OptTable::findNearest(StringRef Option, std::string &NearestString,
continue;
// Find the most appropriate prefix. For example, if a user asks for
// "--helm", suggest "--help" over "-help".
StringRef Prefix;
for (int P = 0; CandidateInfo.Prefixes[P]; P++) {
StringRef Prefix = CandidateInfo.Prefixes[0];
for (int P = 1; CandidateInfo.Prefixes[P]; P++) {
if (Option.startswith(CandidateInfo.Prefixes[P]))
Prefix = CandidateInfo.Prefixes[P];
}

2
unittests/Option/OptionParsingTest.cpp
View File

@ -283,6 +283,8 @@ TEST(Option, FindNearest) {
EXPECT_EQ(Nearest, "-blorp");
EXPECT_EQ(1U, T.findNearest("--blorm", Nearest));
EXPECT_EQ(Nearest, "--blorp");
EXPECT_EQ(1U, T.findNearest("-fjormp", Nearest));
EXPECT_EQ(Nearest, "--fjormp");
// The nearest candidate respects the prefix and value delimiter
// of the original string.

1
unittests/Option/Opts.td
View File

@ -34,4 +34,5 @@ def Cramb : Joined<["/"], "cramb:">, HelpText<"The cramb option">, MetaVarName<"
def Doopf1 : Flag<["-"], "doopf1">, HelpText<"The doopf1 option">, Flags<[OptFlag1]>;
def Doopf2 : Flag<["-"], "doopf2">, HelpText<"The doopf2 option">, Flags<[OptFlag2]>;
def Ermgh : Joined<["--"], "ermgh">, HelpText<"The ermgh option">, MetaVarName<"ERMGH">, Flags<[OptFlag1]>;
def Fjormp : Flag<["--"], "fjormp">, HelpText<"The fjormp option">, Flags<[OptFlag1]>;
def DashDash : Option<["--"], "", KIND_REMAINING_ARGS>;