[Support] Add StringRef::find_lower and contains_lower.

Differential Revision: https://reviews.llvm.org/D25299

llvm-svn: 286724

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/include/llvm/ADT/StringRef.h b/llvm/include/llvm/ADT/StringRef.h
index 97359dd2630..56f1ab167f1 100644
--- a/llvm/include/llvm/ADT/StringRef.h
+++ b/llvm/include/llvm/ADT/StringRef.h
@@ -286,6 +286,12 @@ namespace llvm {
       return npos;
     }
 
+    /// Search for the first character \p C in the string, ignoring case.
+    ///
+    /// \returns The index of the first occurrence of \p C, or npos if not
+    /// found.
+    size_t find_lower(char C, size_t From = 0) const;
+
     /// Search for the first character satisfying the predicate \p F
     ///
     /// \returns The index of the first character satisfying \p F starting from
@@ -318,6 +324,12 @@ namespace llvm {
     /// found.
     size_t find(StringRef Str, size_t From = 0) const;
 
+    /// Search for the first string \p Str in the string, ignoring case.
+    ///
+    /// \returns The index of the first occurrence of \p Str, or npos if not
+    /// found.
+    size_t find_lower(StringRef Str, size_t From = 0) const;
+
     /// Search for the last character \p C in the string.
     ///
     /// \returns The index of the last occurrence of \p C, or npos if not
@@ -333,12 +345,24 @@ namespace llvm {
       return npos;
     }
 
+    /// Search for the last character \p C in the string, ignoring case.
+    ///
+    /// \returns The index of the last occurrence of \p C, or npos if not
+    /// found.
+    size_t rfind_lower(char C, size_t From = npos) const;
+
     /// Search for the last string \p Str in the string.
     ///
     /// \returns The index of the last occurrence of \p Str, or npos if not
     /// found.
     size_t rfind(StringRef Str) const;
 
+    /// Search for the last string \p Str in the string, ignoring case.
+    ///
+    /// \returns The index of the last occurrence of \p Str, or npos if not
+    /// found.
+    size_t rfind_lower(StringRef Str) const;
+
     /// Find the first character in the string that is \p C, or npos if not
     /// found. Same as find.
     size_t find_first_of(char C, size_t From = 0) const {
@@ -393,6 +417,18 @@ namespace llvm {
     LLVM_ATTRIBUTE_ALWAYS_INLINE
     bool contains(char C) const { return find_first_of(C) != npos; }
 
+    /// Return true if the given string is a substring of *this, and false
+    /// otherwise.
+    LLVM_ATTRIBUTE_ALWAYS_INLINE
+    bool contains_lower(StringRef Other) const {
+      return find_lower(Other) != npos;
+    }
+
+    /// Return true if the given character is contained in *this, and false
+    /// otherwise.
+    LLVM_ATTRIBUTE_ALWAYS_INLINE
+    bool contains_lower(char C) const { return find_lower(C) != npos; }
+
     /// @}
     /// @name Helpful Algorithms
     /// @{