StringExtras.cpp revision 7ad046f5968d4709c3c68d165387d13f1da7bab6
17ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens//===-- StringExtras.cpp - Implement the StringExtras header --------------===// 27ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// 37ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// The LLVM Compiler Infrastructure 47ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// 57ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// This file is distributed under the University of Illinois Open Source 67ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// License. See LICENSE.TXT for details. 77ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// 87ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens//===----------------------------------------------------------------------===// 97ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// 107ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// This file implements the StringExtras.h header 117ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens// 127ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens//===----------------------------------------------------------------------===// 137ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 147ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens#include "llvm/ADT/SmallVector.h" 157ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens#include "llvm/ADT/StringExtras.h" 167ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capensusing namespace llvm; 177ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 187ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// StrInStrNoCase - Portable version of strcasestr. Locates the first 197ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// occurrence of string 's1' in string 's2', ignoring case. Returns 207ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// the offset of s2 in s1 or npos if s2 cannot be found. 217ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas CapensStringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) { 227ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens size_t N = s2.size(), M = s1.size(); 237ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens if (N > M) 247ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens return StringRef::npos; 257ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens for (size_t i = 0, e = M - N + 1; i != e; ++i) 267ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens if (s1.substr(i, N).equals_lower(s2)) 277ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens return i; 287ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens return StringRef::npos; 297ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens} 307ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 317ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// getToken - This function extracts one token from source, ignoring any 327ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// leading characters that appear in the Delimiters string, and ending the 337ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// token at any of the characters that appear in the Delimiters string. If 347ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// there are no tokens in the source string, an empty string is returned. 357ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// The function returns a pair containing the extracted token and the 367ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// remaining tail string. 377ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capensstd::pair<StringRef, StringRef> llvm::getToken(StringRef Source, 387ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens StringRef Delimiters) { 397ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens // Figure out where the token starts. 407ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens StringRef::size_type Start = Source.find_first_not_of(Delimiters); 417ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 427ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens // Find the next occurrence of the delimiter. 437ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens StringRef::size_type End = Source.find_first_of(Delimiters, Start); 447ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 457ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens return std::make_pair(Source.slice(Start, End), Source.substr(End)); 467ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens} 477ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens 487ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// SplitString - Split up the specified string according to the specified 497ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens/// delimiters, appending the result fragments to the output list. 507ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capensvoid llvm::SplitString(StringRef Source, 517ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens SmallVectorImpl<StringRef> &OutFragments, 527ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens StringRef Delimiters) { 537ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens std::pair<StringRef, StringRef> S = getToken(Source, Delimiters); 547ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens while (!S.first.empty()) { 557ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens OutFragments.push_back(S.first); 567ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens S = getToken(S.second, Delimiters); 577ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens } 587ad046f5968d4709c3c68d165387d13f1da7bab6Nicolas Capens} 59