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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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43
include/nlohmann/detail/input/json_sax.hpp
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@ -132,6 +132,10 @@ class json_sax_dom_parser : public json_sax<BasicJsonType>
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
json_sax_dom_parser(BasicJsonType& r, const bool allow_exceptions_ = true)
: root(r), allow_exceptions(allow_exceptions_)
{}
bool null() override
{
handle_value(nullptr);
@ -204,25 +208,30 @@ class json_sax_dom_parser : public json_sax<BasicJsonType>
return true;
}
bool parse_error(std::size_t position, const std::string&, const std::string& error_msg) override
bool parse_error(std::size_t position, const std::string& token,
const std::string& error_msg) override
{
JSON_THROW(BasicJsonType::parse_error::create(101, position, error_msg));
errored = true;
if (allow_exceptions)
{
if (error_msg == "number overflow")
{
JSON_THROW(BasicJsonType::out_of_range::create(406, "number overflow parsing '" + token + "'"));
}
else
{
JSON_THROW(BasicJsonType::parse_error::create(101, position, error_msg));
}
}
return false;
}
BasicJsonType& get_value()
bool is_errored() const
{
return root;
return errored;
}
private:
/// the parsed JSON value
BasicJsonType root;
/// stack to model hierarchy of values
std::vector<BasicJsonType*> ref_stack;
/// helper to hold the reference for the next object element
BasicJsonType* object_element = nullptr;
/*!
@invariant If the ref stack is empty, then the passed value will be the new
root.
@ -234,7 +243,6 @@ class json_sax_dom_parser : public json_sax<BasicJsonType>
{
if (ref_stack.empty())
{
assert(root.is_null());
root = BasicJsonType(std::forward<Value>(v));
return &root;
}
@ -254,6 +262,17 @@ class json_sax_dom_parser : public json_sax<BasicJsonType>
}
}
}
/// the parsed JSON value
BasicJsonType& root;
/// stack to model hierarchy of values
std::vector<BasicJsonType*> ref_stack;
/// helper to hold the reference for the next object element
BasicJsonType* object_element = nullptr;
/// whether a syntax error occurred
bool errored = false;
/// whether to throw exceptions in case of errors
const bool allow_exceptions = true;
};
}