File size: 4,125 Bytes
1ce325b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 |
#ifndef UTIL_TOKENIZE_PIECE_H
#define UTIL_TOKENIZE_PIECE_H
#include "util/exception.hh"
#include "util/string_piece.hh"
#include <boost/iterator/iterator_facade.hpp>
#include <algorithm>
#include <string.h>
namespace util {
// Thrown on dereference when out of tokens to parse
class OutOfTokens : public Exception {
public:
OutOfTokens() throw() {}
~OutOfTokens() throw() {}
};
class SingleCharacter {
public:
SingleCharacter() {}
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:
MultiCharacter() {}
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:
AnyCharacter() {}
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_;
};
class BoolCharacter {
public:
BoolCharacter() {}
explicit BoolCharacter(const bool *delimiter) { delimiter_ = delimiter; }
StringPiece Find(const StringPiece &in) const {
for (const char *i = in.data(); i != in.data() + in.size(); ++i) {
if (delimiter_[static_cast<unsigned char>(*i)]) return StringPiece(i, 1);
}
return StringPiece(in.data() + in.size(), 0);
}
template <unsigned Length> static void Build(const char (&characters)[Length], bool (&out)[256]) {
memset(out, 0, sizeof(out));
for (const char *i = characters; i != characters + Length; ++i) {
out[static_cast<unsigned char>(*i)] = true;
}
}
private:
const bool *delimiter_;
};
class AnyCharacterLast {
public:
AnyCharacterLast() {}
explicit AnyCharacterLast(const StringPiece &chars) : chars_(chars) {}
StringPiece Find(const StringPiece &in) const {
return StringPiece(std::find_end(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, SkipEmpty> end() {
return TokenIter<Find, SkipEmpty>();
}
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, SkipEmpty> &other) const {
return current_.data() == other.current_.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_H
|