DirectXShaderCompiler/lib/Support/StringExtras.cpp at main · microsoft/DirectXShaderCompiler · GitHub

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//===-- StringExtras.cpp - Implement the StringExtras header --------------===//

// The LLVM Compiler Infrastructure

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//===----------------------------------------------------------------------===//

// This file implements the StringExtras.h header

//===----------------------------------------------------------------------===//

#include "llvm/ADT/SmallVector.h"

#include "llvm/ADT/StringExtras.h"

using namespace llvm;

/// StrInStrNoCase - Portable version of strcasestr. Locates the first

/// occurrence of string 's1' in string 's2', ignoring case. Returns

/// the offset of s2 in s1 or npos if s2 cannot be found.

StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {

size_t N = s2.size(), M = s1.size();

if (N > M)

return StringRef::npos;

for (size_t i = 0, e = M - N + 1; i != e; ++i)

if (s1.substr(i, N).equals_lower(s2))

return i;

return StringRef::npos;

}

/// getToken - This function extracts one token from source, ignoring any

/// leading characters that appear in the Delimiters string, and ending the

/// token at any of the characters that appear in the Delimiters string. If

/// there are no tokens in the source string, an empty string is returned.

/// The function returns a pair containing the extracted token and the

/// remaining tail string.

std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,

StringRef Delimiters) {

// Figure out where the token starts.

StringRef::size_type Start = Source.find_first_not_of(Delimiters);

// Find the next occurrence of the delimiter.

StringRef::size_type End = Source.find_first_of(Delimiters, Start);

return std::make_pair(Source.slice(Start, End), Source.substr(End));

}

/// SplitString - Split up the specified string according to the specified

/// delimiters, appending the result fragments to the output list.

void llvm::SplitString(StringRef Source,

SmallVectorImpl<StringRef> &OutFragments,

StringRef Delimiters) {

std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);

while (!S.first.empty()) {

OutFragments.push_back(S.first);

S = getToken(S.second, Delimiters);

}

DirectXShaderCompiler/lib/Support/StringExtras.cpp at main · microsoft/DirectXShaderCompiler · GitHub

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