X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FStringExtras.cpp;h=d77ad7f55a18e11cea396d59990dd01d557531a2;hb=8e4ba8f7b19615907e5874b3aa661d52c21fff74;hp=c4016f3e71caaaae33025aa09efbd9314cfee0d7;hpb=f976c856fcc5055f3fc7d9f070d72c2d027c1d9d;p=oota-llvm.git

diff --git a/lib/Support/StringExtras.cpp b/lib/Support/StringExtras.cpp
index c4016f3e71c..d77ad7f55a1 100644
--- a/lib/Support/StringExtras.cpp
+++ b/lib/Support/StringExtras.cpp
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -11,33 +11,49 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
 using namespace llvm;
 
+/// StrInStrNoCase - Portable version of strcasestr.  Locates the first
+/// occurrence of string 's1' in string 's2', ignoring case.  Returns
+/// the offset of s2 in s1 or npos if s2 cannot be found.
+StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
+  size_t N = s2.size(), M = s1.size();
+  if (N > M)
+    return StringRef::npos;
+  for (size_t i = 0, e = M - N + 1; i != e; ++i)
+    if (s1.substr(i, N).equals_lower(s2))
+      return i;
+  return StringRef::npos;
+}
+
 /// getToken - This function extracts one token from source, ignoring any
 /// leading characters that appear in the Delimiters string, and ending the
 /// token at any of the characters that appear in the Delimiters string.  If
 /// there are no tokens in the source string, an empty string is returned.
-/// The Source source string is updated in place to remove the returned string
-/// and any delimiter prefix from it.
-std::string llvm::getToken(std::string &Source, const char *Delimiters) {
-  unsigned NumDelimiters = std::strlen(Delimiters);
-
+/// The function returns a pair containing the extracted token and the
+/// remaining tail string.
+std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
+                                               StringRef Delimiters) {
   // Figure out where the token starts.
-  std::string::size_type Start =
-    Source.find_first_not_of(Delimiters, 0, NumDelimiters);
-  if (Start == std::string::npos) Start = Source.size();
+  StringRef::size_type Start = Source.find_first_not_of(Delimiters);
 
-  // Find the next occurance of the delimiter.
-  std::string::size_type End =
-    Source.find_first_of(Delimiters, Start, NumDelimiters);
-  if (End == std::string::npos) End = Source.size();
+  // Find the next occurrence of the delimiter.
+  StringRef::size_type End = Source.find_first_of(Delimiters, Start);
 
-  // Create the return token.
-  std::string Result = std::string(Source.begin()+Start, Source.begin()+End);
-
-  // Erase the token that we read in.
-  Source.erase(Source.begin(), Source.begin()+End);
+  return std::make_pair(Source.slice(Start, End), Source.substr(End));
+}
 
-  return Result;
+/// SplitString - Split up the specified string according to the specified
+/// delimiters, appending the result fragments to the output list.
+void llvm::SplitString(StringRef Source,
+                       SmallVectorImpl<StringRef> &OutFragments,
+                       StringRef Delimiters) {
+  std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
+  while (!S.first.empty()) {
+    OutFragments.push_back(S.first);
+    S = getToken(S.second, Delimiters);
+  }
 }