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Replace default_callback function with nullptr and check for null callback function before calling it. This is cleaner and better performing.

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This commit is contained in:
Aaron Burghardt 2015-05-10 10:09:20 -04:00
parent 76d3433e6c
commit ef54ace4d2
1 changed files with 12 additions and 18 deletions
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30
src/json.hpp.re2c
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@ -291,12 +291,6 @@ class basic_json
using parser_callback_t = std::function<bool(int depth, parse_event_t event,
const basic_json& parsed)>;
/// default parser callback returns true to keep all elements
static bool default_callback(int, parse_event_t, const basic_json&)
{
return true;
}
/*!
@brief comparison operator for JSON value types
@ -2002,13 +1996,13 @@ class basic_json
/////////////////////
/// deserialize from string
static basic_json parse(const string_t& s, parser_callback_t cb = default_callback)
static basic_json parse(const string_t& s, parser_callback_t cb = nullptr)
{
return parser(s, cb).parse();
}
/// deserialize from stream
static basic_json parse(std::istream& i, parser_callback_t cb = default_callback)
static basic_json parse(std::istream& i, parser_callback_t cb = nullptr)
{
return parser(i, cb).parse();
}
@ -3893,14 +3887,14 @@ class basic_json
{
public:
/// constructor for strings
inline parser(const string_t& s, parser_callback_t cb = default_callback) : callback(cb), m_lexer(s)
inline parser(const string_t& s, parser_callback_t cb = nullptr) : callback(cb), m_lexer(s)
{
// read first token
get_token();
}
/// a parser reading from an input stream
inline parser(std::istream& _is, parser_callback_t cb = default_callback) : callback(cb),
inline parser(std::istream& _is, parser_callback_t cb = nullptr) : callback(cb),
m_lexer(&_is)
{
// read first token
@ -3927,7 +3921,7 @@ class basic_json
{
case (lexer::token_type::begin_object):
{
if (keep and (keep = callback(depth++, parse_event_t::object_start, result)))
if (keep and (not callback or (keep = callback(depth++, parse_event_t::object_start, result))))
{
// explicitly set result to object to cope with {}
result.m_type = value_t::object;
@ -3941,7 +3935,7 @@ class basic_json
if (last_token == lexer::token_type::end_object)
{
get_token();
if (keep and not (keep = callback(--depth, parse_event_t::object_end, result)))
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
{
result = basic_json(value_t::discarded);
}
@ -3967,7 +3961,7 @@ class basic_json
bool keep_tag = false;
if (keep)
{
keep_tag = callback(depth, parse_event_t::key, basic_json(key));
keep_tag = callback ? callback(depth, parse_event_t::key, basic_json(key)) : true;
}
// parse separator (:)
@ -3987,7 +3981,7 @@ class basic_json
// closing }
expect(lexer::token_type::end_object);
get_token();
if (keep and not callback(--depth, parse_event_t::object_end, result))
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
{
result = basic_json(value_t::discarded);
}
@ -3997,7 +3991,7 @@ class basic_json
case (lexer::token_type::begin_array):
{
if (keep and (keep = callback(depth++, parse_event_t::array_start, result)))
if (keep and (not callback or (keep = callback(depth++, parse_event_t::array_start, result))))
{
// explicitly set result to object to cope with []
result.m_type = value_t::array;
@ -4011,7 +4005,7 @@ class basic_json
if (last_token == lexer::token_type::end_array)
{
get_token();
if (not callback(--depth, parse_event_t::array_end, result))
if (callback and not callback(--depth, parse_event_t::array_end, result))
{
result = basic_json(value_t::discarded);
}
@ -4042,7 +4036,7 @@ class basic_json
// closing ]
expect(lexer::token_type::end_array);
get_token();
if (keep and not callback(--depth, parse_event_t::array_end, result))
if (keep and callback and not callback(--depth, parse_event_t::array_end, result))
{
result = basic_json(value_t::discarded);
}
@ -4119,7 +4113,7 @@ class basic_json
}
}
if (keep and not callback(depth, parse_event_t::value, result))
if (keep and callback and not callback(depth, parse_event_t::value, result))
{
result = basic_json(value_t::discarded);
}