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Introduce Regex::isLiteralERE function.

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This will be used to implement an optimisation for literal entries
in special case lists.

Differential Revision: http://llvm-reviews.chandlerc.com/D1278

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187731 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2013-08-05 17:47:59 +00:00
parent 2a37c7e9e6
commit aa80e61b0d
3 changed files with 26 additions and 0 deletions
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4
include/llvm/Support/Regex.h
View File

@ -77,6 +77,10 @@ namespace llvm {
/// string.
std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
/// \brief If this function returns true, ^Str$ is an extended regular
/// expression that matches Str and only Str.
static bool isLiteralERE(StringRef Str);
private:
struct llvm_regex *preg;
int error;

7
lib/Support/Regex.cpp
View File

@ -168,3 +168,10 @@ std::string Regex::sub(StringRef Repl, StringRef String,
return Res;
}
bool Regex::isLiteralERE(StringRef Str) {
// Check for regex metacharacters. This list was derived from our regex
// implementation in regcomp.c and double checked against the POSIX extended
// regular expression specification.
return Str.find_first_of("()^$|*+?.[]\\{}") == StringRef::npos;
}

15
unittests/Support/RegexTest.cpp
View File

@ -112,4 +112,19 @@ TEST_F(RegexTest, Substitution) {
EXPECT_EQ(Error, "invalid backreference string '100'");
}
TEST_F(RegexTest, IsLiteralERE) {
EXPECT_TRUE(Regex::isLiteralERE("abc"));
EXPECT_FALSE(Regex::isLiteralERE("a(bc)"));
EXPECT_FALSE(Regex::isLiteralERE("^abc"));
EXPECT_FALSE(Regex::isLiteralERE("abc$"));
EXPECT_FALSE(Regex::isLiteralERE("a|bc"));
EXPECT_FALSE(Regex::isLiteralERE("abc*"));
EXPECT_FALSE(Regex::isLiteralERE("abc+"));
EXPECT_FALSE(Regex::isLiteralERE("abc?"));
EXPECT_FALSE(Regex::isLiteralERE("abc."));
EXPECT_FALSE(Regex::isLiteralERE("a[bc]"));
EXPECT_FALSE(Regex::isLiteralERE("abc\\1"));
EXPECT_FALSE(Regex::isLiteralERE("abc{1,2}"));
}
}