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handle utf16 encoding correctly by parsing as sequence and applying utf16->utf32->utf8 conversion.

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This commit is contained in:
artemp 2017-03-01 18:46:48 +01:00
parent 04dd05c971
commit 92f07b7a7a
1 changed files with 30 additions and 5 deletions
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35
include/mapnik/json/unicode_string_grammar_x3_def.hpp
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@ -24,8 +24,9 @@
#define MAPNIK_JSON_UNICODE_STRING_GRAMMAR_X3_DEF_HPP
#include <mapnik/json/unicode_string_grammar_x3.hpp>
#include <iostream>
// boost
#include <boost/regex/pending/unicode_iterator.hpp>
//
namespace mapnik { namespace json { namespace grammar {
namespace x3 = boost::spirit::x3;
@ -52,6 +53,25 @@ auto push_char = [](auto const& ctx) { _val(ctx).push_back(_attr(ctx));};
auto push_utf8 = [](auto const& ctx) { detail::push_utf8_impl(_val(ctx), _attr(ctx));};
auto push_utf16 = [](auto const& ctx)
{
using iterator_type = std::vector<std::uint16_t>::const_iterator;
auto const& utf16 = _attr(ctx);
try
{
boost::u16_to_u32_iterator<iterator_type> itr(utf16.begin());
boost::u16_to_u32_iterator<iterator_type> end(utf16.end());
for (; itr != end; ++itr)
{
detail::push_utf8_impl(_val(ctx), *itr);
}
}
catch( ... )
{
// caught
}
};
auto push_esc = [] (auto const& ctx)
{
std::string & utf8 = _val(ctx);
@ -85,7 +105,7 @@ using x3::eol;
using x3::no_skip;
x3::uint_parser<char, 16, 2, 2> const hex2 {};
x3::uint_parser<uchar, 16, 4, 4> const hex4 {};
x3::uint_parser<std::uint16_t, 16, 4, 4> const hex4 {};
x3::uint_parser<uchar, 16, 8, 8> const hex8 {};
// start rule
@ -93,13 +113,17 @@ unicode_string_grammar_type const unicode_string("Unicode String");
// rules
x3::rule<class double_quoted_tag, std::string> const double_quoted("Double-quoted string");
x3::rule<class escaped_tag, std::string> const escaped("Escaped Characted");
x3::rule<class utf16_string_tag, std::vector<std::uint16_t>> const utf16_string("UTF16 encoded string");
auto unicode_string_def = double_quoted
;
auto utf16_string_def = lit('u') > hex4 > *(lit("\\u") > hex4);
auto const escaped_def = lit('\\') >
((lit('x') > hex2[push_char])
|
(lit('u') > hex4[push_utf8])
utf16_string[push_utf16]
|
(lit('U') > hex8[push_utf8])
|
@ -116,7 +140,8 @@ auto const double_quoted_def = lit('"') > no_skip[*(escaped[append] | (~char_('"
BOOST_SPIRIT_DEFINE(
unicode_string,
double_quoted,
escaped
escaped,
utf16_string
);
#pragma GCC diagnostic pop