[llvm-commits] CVS: llvm/lib/Support/StringExtras.cpp

[Chris Lattner]

Changes in directory llvm/lib/Support:

StringExtras.cpp added (r1.1)

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Log message:

implement new getToken function


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Diffs of the changes:  (+43 -0)

Index: llvm/lib/Support/StringExtras.cpp
diff -c /dev/null llvm/lib/Support/StringExtras.cpp:1.1
*** /dev/null	Sun Dec 28 23:07:12 2003
--- llvm/lib/Support/StringExtras.cpp	Sun Dec 28 23:07:02 2003
***************
*** 0 ****
--- 1,43 ----
+ //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
+ // 
+ //                     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 implements the StringExtras.h header
+ //
+ //===----------------------------------------------------------------------===//
+ 
+ #include "Support/StringExtras.h"
+ using namespace llvm;
+ 
+ /// 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);
+ 
+   // 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();
+ 
+   // 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();
+ 
+   // 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 Result;
+ }