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#ifndef UTIL_TOKENIZE_PIECE__
#define UTIL_TOKENIZE_PIECE__
#include "util/exception.hh"
#include "util/string_piece.hh"
#include <boost/iterator/iterator_facade.hpp>
#include <algorithm>
#include <iostream>
namespace util {
// Thrown on dereference when out of tokens to parse
class OutOfTokens : public Exception {
public:
OutOfTokens() throw() {}
~OutOfTokens() throw() {}
};
class SingleCharacter {
public:
explicit SingleCharacter(char delim) : delim_(delim) {}
StringPiece Find(const StringPiece &in) const {
return StringPiece(std::find(in.data(), in.data() + in.size(), delim_), 1);
}
private:
char delim_;
};
class MultiCharacter {
public:
explicit MultiCharacter(const StringPiece &delimiter) : delimiter_(delimiter) {}
StringPiece Find(const StringPiece &in) const {
return StringPiece(std::search(in.data(), in.data() + in.size(), delimiter_.data(), delimiter_.data() + delimiter_.size()), delimiter_.size());
}
private:
StringPiece delimiter_;
};
class AnyCharacter {
public:
explicit AnyCharacter(const StringPiece &chars) : chars_(chars) {}
StringPiece Find(const StringPiece &in) const {
return StringPiece(std::find_first_of(in.data(), in.data() + in.size(), chars_.data(), chars_.data() + chars_.size()), 1);
}
private:
StringPiece chars_;
};
template <class Find, bool SkipEmpty = false> class TokenIter : public boost::iterator_facade<TokenIter<Find, SkipEmpty>, const StringPiece, boost::forward_traversal_tag> {
public:
TokenIter() {}
template <class Construct> TokenIter(const StringPiece &str, const Construct &construct) : after_(str), finder_(construct) {
increment();
}
bool operator!() const {
return current_.data() == 0;
}
operator bool() const {
return current_.data() != 0;
}
static TokenIter<Find> end() {
return TokenIter<Find>();
}
private:
friend class boost::iterator_core_access;
void increment() {
do {
StringPiece found(finder_.Find(after_));
current_ = StringPiece(after_.data(), found.data() - after_.data());
if (found.data() == after_.data() + after_.size()) {
after_ = StringPiece(NULL, 0);
} else {
after_ = StringPiece(found.data() + found.size(), after_.data() - found.data() + after_.size() - found.size());
}
} while (SkipEmpty && current_.data() && current_.empty()); // Compiler should optimize this away if SkipEmpty is false.
}
bool equal(const TokenIter<Find> &other) const {
return after_.data() == other.after_.data();
}
const StringPiece &dereference() const {
UTIL_THROW_IF(!current_.data(), OutOfTokens, "Ran out of tokens");
return current_;
}
StringPiece current_;
StringPiece after_;
Find finder_;
};
} // namespace util
#endif // UTIL_TOKENIZE_PIECE__
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