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#ifndef BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_NARROW_ENCODING_HPP
#define BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_NARROW_ENCODING_HPP
#include <boost/assert.hpp>
#include <boost/range/iterator_range_core.hpp>
#include <utility>
namespace boost { namespace property_tree {
namespace json_parser { namespace detail
{
struct external_ascii_superset_encoding
{
typedef char external_char;
bool is_nl(char c) const { return c == '\n'; }
bool is_ws(char c) const {
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
bool is_minus(char c) const { return c == '-'; }
bool is_plusminus(char c) const { return c == '+' || c == '-'; }
bool is_dot(char c) const { return c == '.'; }
bool is_eE(char c) const { return c == 'e' || c == 'E'; }
bool is_0(char c) const { return c == '0'; }
bool is_digit(char c) const { return c >= '0' && c <= '9'; }
bool is_digit0(char c) const { return c >= '1' && c <= '9'; }
bool is_quote(char c) const { return c == '"'; }
bool is_backslash(char c) const { return c == '\\'; }
bool is_slash(char c) const { return c == '/'; }
bool is_comma(char c) const { return c == ','; }
bool is_open_bracket(char c) const { return c == '['; }
bool is_close_bracket(char c) const { return c == ']'; }
bool is_colon(char c) const { return c == ':'; }
bool is_open_brace(char c) const { return c == '{'; }
bool is_close_brace(char c) const { return c == '}'; }
bool is_a(char c) const { return c == 'a'; }
bool is_b(char c) const { return c == 'b'; }
bool is_e(char c) const { return c == 'e'; }
bool is_f(char c) const { return c == 'f'; }
bool is_l(char c) const { return c == 'l'; }
bool is_n(char c) const { return c == 'n'; }
bool is_r(char c) const { return c == 'r'; }
bool is_s(char c) const { return c == 's'; }
bool is_t(char c) const { return c == 't'; }
bool is_u(char c) const { return c == 'u'; }
int decode_hexdigit(char c) {
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
return -1;
}
};
struct utf8_utf8_encoding : external_ascii_superset_encoding
{
typedef char internal_char;
template <typename Iterator>
boost::iterator_range<Iterator>
to_internal(Iterator first, Iterator last) const {
return boost::make_iterator_range(first, last);
}
char to_internal_trivial(char c) const {
BOOST_ASSERT(static_cast<unsigned char>(c) <= 0x7f);
return c;
}
template <typename Iterator, typename Sentinel,
typename EncodingErrorFn>
void skip_codepoint(Iterator& cur, Sentinel end,
EncodingErrorFn error_fn) const {
transcode_codepoint(cur, end, DoNothing(), error_fn);
}
template <typename Iterator, typename Sentinel, typename TranscodedFn,
typename EncodingErrorFn>
void transcode_codepoint(Iterator& cur, Sentinel end,
TranscodedFn transcoded_fn, EncodingErrorFn error_fn) const {
unsigned char c = *cur;
++cur;
if (c <= 0x7f) {
// Solo byte, filter out disallowed codepoints.
if (c < 0x20) {
error_fn();
}
transcoded_fn(c);
return;
}
int trailing = trail_table(c);
if (trailing == -1) {
// Standalone trailing byte or overly long sequence.
error_fn();
}
transcoded_fn(c);
for (int i = 0; i < trailing; ++i) {
if (cur == end || !is_trail(*cur)) {
error_fn();
}
transcoded_fn(*cur);
++cur;
}
}
template <typename TranscodedFn>
void feed_codepoint(unsigned codepoint,
TranscodedFn transcoded_fn) const {
if (codepoint <= 0x7f) {
transcoded_fn(static_cast<char>(codepoint));
} else if (codepoint <= 0x7ff) {
transcoded_fn(static_cast<char>(0xc0 | (codepoint >> 6)));
transcoded_fn(trail(codepoint));
} else if (codepoint <= 0xffff) {
transcoded_fn(static_cast<char>(0xe0 | (codepoint >> 12)));
transcoded_fn(trail(codepoint >> 6));
transcoded_fn(trail(codepoint));
} else if (codepoint <= 0x10ffff) {
transcoded_fn(static_cast<char>(0xf0 | (codepoint >> 18)));
transcoded_fn(trail(codepoint >> 12));
transcoded_fn(trail(codepoint >> 6));
transcoded_fn(trail(codepoint));
}
}
template <typename Iterator, typename Sentinel>
void skip_introduction(Iterator& cur, Sentinel end) const {
if (cur != end && static_cast<unsigned char>(*cur) == 0xef) {
if (++cur == end) return;
if (++cur == end) return;
if (++cur == end) return;
}
}
private:
struct DoNothing {
void operator ()(char) const {}
};
bool is_trail(unsigned char c) const {
return (c & 0xc0) == 0x80;
}
int trail_table(unsigned char c) const {
static const signed char table[] = {
/* not a lead byte */
/* 0x10???sss */ -1, -1, -1, -1, -1, -1, -1, -1,
/* 0x110??sss */ 1, 1, 1, 1, /* 1 trailing byte */
/* 0x1110?sss */ 2, 2, /* 2 trailing bytes */
/* 0x11110sss */ 3, /* 3 trailing bytes */
/* 0x11111sss */ -1 /* 4 or 5 trailing bytes, disallowed */
};
return table[(c & 0x7f) >> 3];
}
char trail(unsigned unmasked) const {
return static_cast<char>(0x80 | (unmasked & 0x3f));
}
};
}}}}
#endif
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