1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file was developed by the LLVM research group and is distributed under 6 // the University of Illinois Open Source License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the StringExtras.h header 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/StringExtras.h" 15 using namespace llvm; 16 17 /// getToken - This function extracts one token from source, ignoring any 18 /// leading characters that appear in the Delimiters string, and ending the 19 /// token at any of the characters that appear in the Delimiters string. If 20 /// there are no tokens in the source string, an empty string is returned. 21 /// The Source source string is updated in place to remove the returned string 22 /// and any delimiter prefix from it. 23 std::string llvm::getToken(std::string &Source, const char *Delimiters) { 24 unsigned NumDelimiters = std::strlen(Delimiters); 25 26 // Figure out where the token starts. 27 std::string::size_type Start = 28 Source.find_first_not_of(Delimiters, 0, NumDelimiters); 29 if (Start == std::string::npos) Start = Source.size(); 30 31 // Find the next occurance of the delimiter. 32 std::string::size_type End = 33 Source.find_first_of(Delimiters, Start, NumDelimiters); 34 if (End == std::string::npos) End = Source.size(); 35 36 // Create the return token. 37 std::string Result = std::string(Source.begin()+Start, Source.begin()+End); 38 39 // Erase the token that we read in. 40 Source.erase(Source.begin(), Source.begin()+End); 41 42 return Result; 43 } 44