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annotate lib/Support/StringExtras.cpp @ 3:9ad51c7bc036

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 15 May 2013 06:43:32 +0900
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children afa8332a0e37
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1 //===-- StringExtras.cpp - Implement the StringExtras header --------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the StringExtras.h header
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/ADT/SmallVector.h"
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15 #include "llvm/ADT/STLExtras.h"
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16 #include "llvm/ADT/StringExtras.h"
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17 using namespace llvm;
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19 /// StrInStrNoCase - Portable version of strcasestr. Locates the first
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20 /// occurrence of string 's1' in string 's2', ignoring case. Returns
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21 /// the offset of s2 in s1 or npos if s2 cannot be found.
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22 StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
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23 size_t N = s2.size(), M = s1.size();
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24 if (N > M)
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25 return StringRef::npos;
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26 for (size_t i = 0, e = M - N + 1; i != e; ++i)
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27 if (s1.substr(i, N).equals_lower(s2))
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28 return i;
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29 return StringRef::npos;
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30 }
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31
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32 /// getToken - This function extracts one token from source, ignoring any
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33 /// leading characters that appear in the Delimiters string, and ending the
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34 /// token at any of the characters that appear in the Delimiters string. If
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35 /// there are no tokens in the source string, an empty string is returned.
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36 /// The function returns a pair containing the extracted token and the
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37 /// remaining tail string.
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38 std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
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39 StringRef Delimiters) {
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40 // Figure out where the token starts.
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41 StringRef::size_type Start = Source.find_first_not_of(Delimiters);
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42
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43 // Find the next occurrence of the delimiter.
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44 StringRef::size_type End = Source.find_first_of(Delimiters, Start);
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45
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46 return std::make_pair(Source.slice(Start, End), Source.substr(End));
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47 }
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49 /// SplitString - Split up the specified string according to the specified
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50 /// delimiters, appending the result fragments to the output list.
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51 void llvm::SplitString(StringRef Source,
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52 SmallVectorImpl<StringRef> &OutFragments,
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53 StringRef Delimiters) {
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54 std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
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55 while (!S.first.empty()) {
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56 OutFragments.push_back(S.first);
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57 S = getToken(S.second, Delimiters);
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58 }
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59 }