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82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
//===-- StringExtras.cpp - Implement the StringExtras header --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the StringExtras.h header
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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/// StrInStrNoCase - Portable version of strcasestr. Locates the first
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/// occurrence of string 's1' in string 's2', ignoring case. Returns
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/// the offset of s2 in s1 or npos if s2 cannot be found.
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StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
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size_t N = s2.size(), M = s1.size();
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if (N > M)
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return StringRef::npos;
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for (size_t i = 0, e = M - N + 1; i != e; ++i)
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if (s1.substr(i, N).equals_lower(s2))
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return i;
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return StringRef::npos;
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}
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/// getToken - This function extracts one token from source, ignoring any
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/// leading characters that appear in the Delimiters string, and ending the
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/// token at any of the characters that appear in the Delimiters string. If
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/// there are no tokens in the source string, an empty string is returned.
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/// The function returns a pair containing the extracted token and the
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/// remaining tail string.
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std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
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StringRef Delimiters) {
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// Figure out where the token starts.
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StringRef::size_type Start = Source.find_first_not_of(Delimiters);
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// Find the next occurrence of the delimiter.
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StringRef::size_type End = Source.find_first_of(Delimiters, Start);
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return std::make_pair(Source.slice(Start, End), Source.substr(End));
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}
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/// SplitString - Split up the specified string according to the specified
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/// delimiters, appending the result fragments to the output list.
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void llvm::SplitString(StringRef Source,
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SmallVectorImpl<StringRef> &OutFragments,
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StringRef Delimiters) {
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StringRef S2, S;
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tie(S2, S) = getToken(Source, Delimiters);
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while (!S2.empty()) {
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OutFragments.push_back(S2);
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tie(S2, S) = getToken(S, Delimiters);
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}
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}
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void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
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StringRef Separators, int MaxSplit,
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bool KeepEmpty) const {
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StringRef rest = *this;
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// rest.data() is used to distinguish cases like "a," that splits into
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// "a" + "" and "a" that splits into "a" + 0.
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for (int splits = 0;
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rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
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++splits) {
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std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
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if (p.first.size() != 0 || KeepEmpty)
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A.push_back(p.first);
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rest = p.second;
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}
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// If we have a tail left, add it.
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if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))
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A.push_back(rest);
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}
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