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🔥 replaced acceptor with SAX parser

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This commit is contained in:
Niels Lohmann
2018-03-07 22:40:48 +01:00
parent 303a0c5843
commit 8b379948d0
3 changed files with 154 additions and 228 deletions
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117
include/nlohmann/detail/input/parser.hpp
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@@ -137,7 +137,9 @@ class parser
*/
bool accept(const bool strict = true)
{
if (not accept_internal())
json_sax_acceptor<BasicJsonType> sax_acceptor;
if (not sax_parse_internal(&sax_acceptor))
{
return false;
}
@@ -436,119 +438,6 @@ class parser
}
}
/*!
@brief the actual acceptor
@invariant 1. The last token is not yet processed. Therefore, the caller
of this function must make sure a token has been read.
2. When this function returns, the last token is processed.
That is, the last read character was already considered.
This invariant makes sure that no token needs to be "unput".
*/
bool accept_internal()
{
switch (last_token)
{
case token_type::begin_object:
{
// read next token
get_token();
// closing } -> we are done
if (last_token == token_type::end_object)
{
return true;
}
// parse values
while (true)
{
// parse key
if (last_token != token_type::value_string)
{
return false;
}
// parse separator (:)
get_token();
if (last_token != token_type::name_separator)
{
return false;
}
// parse value
get_token();
if (not accept_internal())
{
return false;
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing }
return (last_token == token_type::end_object);
}
}
case token_type::begin_array:
{
// read next token
get_token();
// closing ] -> we are done
if (last_token == token_type::end_array)
{
return true;
}
// parse values
while (true)
{
// parse value
if (not accept_internal())
{
return false;
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing ]
return (last_token == token_type::end_array);
}
}
case token_type::value_float:
{
// reject infinity or NAN
return std::isfinite(m_lexer.get_number_float());
}
case token_type::literal_false:
case token_type::literal_null:
case token_type::literal_true:
case token_type::value_integer:
case token_type::value_string:
case token_type::value_unsigned:
return true;
default: // the last token was unexpected
return false;
}
}
bool sax_parse_internal(json_sax_t* sax)
{
switch (last_token)