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🔨 using the SAX-DOM parser

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This commit is contained in:
Niels Lohmann 2018-03-06 18:17:07 +01:00
parent faf2546a15
commit 5beab80553
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GPG key ID: 7F3CEA63AE251B69
6 changed files with 173 additions and 166 deletions
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90
include/nlohmann/detail/input/parser.hpp
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@ -63,11 +63,10 @@ class parser
const parser_callback_t cb = nullptr,
const bool allow_exceptions_ = true)
: callback(cb), m_lexer(adapter), allow_exceptions(allow_exceptions_)
{}
parser(detail::input_adapter_t adapter, json_sax_t* s)
: m_lexer(adapter), sax(s)
{}
{
// read first token
get_token();
}
/*!
@brief public parser interface
@ -81,31 +80,52 @@ class parser
*/
void parse(const bool strict, BasicJsonType& result)
{
// read first token
get_token();
parse_internal(true, result);
result.assert_invariant();
// in strict mode, input must be completely read
if (strict)
if (callback)
{
get_token();
expect(token_type::end_of_input);
parse_internal(true, result);
result.assert_invariant();
// in strict mode, input must be completely read
if (strict)
{
get_token();
expect(token_type::end_of_input);
}
// in case of an error, return discarded value
if (errored)
{
result = value_t::discarded;
return;
}
// set top-level value to null if it was discarded by the callback
// function
if (result.is_discarded())
{
result = nullptr;
}
}
// in case of an error, return discarded value
if (errored)
else
{
result = value_t::discarded;
return;
}
json_sax_dom_parser<BasicJsonType> sdp(result, allow_exceptions);
sax_parse_internal(&sdp);
result.assert_invariant();
// set top-level value to null if it was discarded by the callback
// function
if (result.is_discarded())
{
result = nullptr;
// in strict mode, input must be completely read
if (strict and (get_token() != token_type::end_of_input))
{
sdp.parse_error(m_lexer.get_position(),
m_lexer.get_token_string(),
exception_message(token_type::end_of_input));
}
// in case of an error, return discarded value
if (sdp.is_errored())
{
result = value_t::discarded;
return;
}
}
}
@ -117,9 +137,6 @@ class parser
*/
bool accept(const bool strict = true)
{
// read first token
get_token();
if (not accept_internal())
{
return false;
@ -129,12 +146,9 @@ class parser
return not strict or (get_token() == token_type::end_of_input);
}
bool sax_parse()
bool sax_parse(json_sax_t* sax)
{
// read first token
get_token();
return sax_parse_internal();
return sax_parse_internal(sax);
}
private:
@ -535,7 +549,7 @@ class parser
}
}
bool sax_parse_internal()
bool sax_parse_internal(json_sax_t* sax)
{
switch (last_token)
{
@ -584,7 +598,7 @@ class parser
// parse value
get_token();
if (not sax_parse_internal())
if (not sax_parse_internal(sax))
{
return false;
}
@ -631,7 +645,7 @@ class parser
while (true)
{
// parse value
if (not sax_parse_internal())
if (not sax_parse_internal(sax))
{
return false;
}
@ -782,8 +796,6 @@ class parser
bool errored = false;
/// whether to throw exceptions in case of errors
const bool allow_exceptions = true;
/// associated SAX parse event receiver
json_sax_t* sax = nullptr;
};
}
}