1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
3 // The LLVM Compiler Infrastructure
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.
8 //===----------------------------------------------------------------------===//
10 // This file implements the StringExtras.h header
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/StringExtras.h"
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);
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();
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();
36 // Create the return token.
37 std::string Result = std::string(Source.begin()+Start, Source.begin()+End);
39 // Erase the token that we read in.
40 Source.erase(Source.begin(), Source.begin()+End);