[llvm] r187731 - Introduce Regex::isLiteralERE function.

[Peter Collingbourne]

Author: pcc
Date: Mon Aug  5 12:47:59 2013
New Revision: 187731

URL: http://llvm.org/viewvc/llvm-project?rev=187731&view=rev
Log:
Introduce Regex::isLiteralERE function.

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

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

Modified:
    llvm/trunk/include/llvm/Support/Regex.h
    llvm/trunk/lib/Support/Regex.cpp
    llvm/trunk/unittests/Support/RegexTest.cpp

Modified: llvm/trunk/include/llvm/Support/Regex.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/Regex.h?rev=187731&r1=187730&r2=187731&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/Regex.h (original)
+++ llvm/trunk/include/llvm/Support/Regex.h Mon Aug  5 12:47:59 2013
@@ -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;

Modified: llvm/trunk/lib/Support/Regex.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Regex.cpp?rev=187731&r1=187730&r2=187731&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Regex.cpp (original)
+++ llvm/trunk/lib/Support/Regex.cpp Mon Aug  5 12:47:59 2013
@@ -168,3 +168,10 @@ std::string Regex::sub(StringRef Repl, S
 
   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;
+}

Modified: llvm/trunk/unittests/Support/RegexTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/Support/RegexTest.cpp?rev=187731&r1=187730&r2=187731&view=diff
==============================================================================
--- llvm/trunk/unittests/Support/RegexTest.cpp (original)
+++ llvm/trunk/unittests/Support/RegexTest.cpp Mon Aug  5 12:47:59 2013
@@ -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}"));
+}
+
 }