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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/StringExtras.h"
#include "llvm/ADT/SmallVector.h"
#include <cstring>
using namespace llvm;
/// 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 Source source string is updated in place to remove the returned string
/// and any delimiter prefix from it.
std::string llvm::getToken(std::string &Source, const char *Delimiters) {
size_t NumDelimiters = std::strlen(Delimiters);
// Figure out where the token starts.
std::string::size_type Start =
Source.find_first_not_of(Delimiters, 0, NumDelimiters);
if (Start == std::string::npos) Start = Source.size();
// Find the next occurance of the delimiter.
std::string::size_type End =
Source.find_first_of(Delimiters, Start, NumDelimiters);
if (End == std::string::npos) End = Source.size();
// Create the return token.
std::string Result = std::string(Source.begin()+Start, Source.begin()+End);
// Erase the token that we read in.
Source.erase(Source.begin(), Source.begin()+End);
return Result;
}
/// SplitString - Split up the specified string according to the specified
/// delimiters, appending the result fragments to the output list.
void llvm::SplitString(const std::string &Source,
std::vector<std::string> &OutFragments,
const char *Delimiters) {
std::string S = Source;
std::string S2 = getToken(S, Delimiters);
while (!S2.empty()) {
OutFragments.push_back(S2);
S2 = getToken(S, Delimiters);
}
}
void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
StringRef Separators, int MaxSplit,
bool KeepEmpty) const {
StringRef rest = *this;
// rest.data() is used to distinguish cases like "a," that splits into
// "a" + "" and "a" that splits into "a" + 0.
for (int splits = 0;
rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
++splits) {
std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
if (p.first.size() != 0 || KeepEmpty)
A.push_back(p.first);
rest = p.second;
}
// If we have a tail left, add it.
if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))
A.push_back(rest);
}
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