1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the StringExtras.h header 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/ADT/StringExtras.h" 16 using namespace llvm; 17 18 /// StrInStrNoCase - Portable version of strcasestr. Locates the first 19 /// occurrence of string 's1' in string 's2', ignoring case. Returns 20 /// the offset of s2 in s1 or npos if s2 cannot be found. 21 StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) { 22 size_t N = s2.size(), M = s1.size(); 23 if (N > M) 24 return StringRef::npos; 25 for (size_t i = 0, e = M - N + 1; i != e; ++i) 26 if (s1.substr(i, N).equals_lower(s2)) 27 return i; 28 return StringRef::npos; 29 } 30 31 /// getToken - This function extracts one token from source, ignoring any 32 /// leading characters that appear in the Delimiters string, and ending the 33 /// token at any of the characters that appear in the Delimiters string. If 34 /// there are no tokens in the source string, an empty string is returned. 35 /// The function returns a pair containing the extracted token and the 36 /// remaining tail string. 37 std::pair<StringRef, StringRef> llvm::getToken(StringRef Source, 38 StringRef Delimiters) { 39 // Figure out where the token starts. 40 StringRef::size_type Start = Source.find_first_not_of(Delimiters); 41 42 // Find the next occurrence of the delimiter. 43 StringRef::size_type End = Source.find_first_of(Delimiters, Start); 44 45 return std::make_pair(Source.slice(Start, End), Source.substr(End)); 46 } 47 48 /// SplitString - Split up the specified string according to the specified 49 /// delimiters, appending the result fragments to the output list. 50 void llvm::SplitString(StringRef Source, 51 SmallVectorImpl<StringRef> &OutFragments, 52 StringRef Delimiters) { 53 std::pair<StringRef, StringRef> S = getToken(Source, Delimiters); 54 while (!S.first.empty()) { 55 OutFragments.push_back(S.first); 56 S = getToken(S.second, Delimiters); 57 } 58 } 59
