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mirror of https://github.com/qpdf/qpdf.git synced 2024-12-23 11:28:56 +00:00
qpdf/libqpdf/JSON.cc
Jay Berkenbilt 3440ea7d3c JSON::serialize -> unparse
Unparse is admittedly strange, but I'd rather be strange and
consistent, and everything else in the qpdf library uses unparse to
serialize. (If you're reading this, the convention of using "unparse"
comes from the "clu" programming language.)
2018-12-25 11:52:21 -05:00

397 lines
8.6 KiB
C++

#include <qpdf/JSON.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QTC.hh>
#include <stdexcept>
JSON::Members::~Members()
{
}
JSON::Members::Members(PointerHolder<JSON_value> value) :
value(value)
{
}
JSON::JSON(PointerHolder<JSON_value> value) :
m(new Members(value))
{
}
JSON::JSON_value::~JSON_value()
{
}
JSON::JSON_dictionary::~JSON_dictionary()
{
}
std::string JSON::JSON_dictionary::unparse(size_t depth) const
{
std::string result = "{";
bool first = true;
for (std::map<std::string, PointerHolder<JSON_value> >::const_iterator
iter = members.begin();
iter != members.end(); ++iter)
{
if (first)
{
first = false;
}
else
{
result.append(1, ',');
}
result.append(1, '\n');
result.append(2 * (1 + depth), ' ');
result += ("\"" + (*iter).first + "\": " +
(*iter).second->unparse(1 + depth));
}
if (! first)
{
result.append(1, '\n');
result.append(2 * depth, ' ');
}
result.append(1, '}');
return result;
}
JSON::JSON_array::~JSON_array()
{
}
std::string JSON::JSON_array::unparse(size_t depth) const
{
std::string result = "[";
bool first = true;
for (std::vector<PointerHolder<JSON_value> >::const_iterator iter =
elements.begin();
iter != elements.end(); ++iter)
{
if (first)
{
first = false;
}
else
{
result.append(1, ',');
}
result.append(1, '\n');
result.append(2 * (1 + depth), ' ');
result += (*iter)->unparse(1 + depth);
}
if (! first)
{
result.append(1, '\n');
result.append(2 * depth, ' ');
}
result.append(1, ']');
return result;
}
JSON::JSON_string::JSON_string(std::string const& utf8) :
encoded(encode_string(utf8))
{
}
JSON::JSON_string::~JSON_string()
{
}
std::string JSON::JSON_string::unparse(size_t) const
{
return "\"" + encoded + "\"";
}
JSON::JSON_number::JSON_number(long long value) :
encoded(QUtil::int_to_string(value))
{
}
JSON::JSON_number::JSON_number(double value) :
encoded(QUtil::double_to_string(value, 6))
{
}
JSON::JSON_number::JSON_number(std::string const& value) :
encoded(value)
{
}
JSON::JSON_number::~JSON_number()
{
}
std::string JSON::JSON_number::unparse(size_t) const
{
return encoded;
}
JSON::JSON_bool::JSON_bool(bool val) :
value(val)
{
}
JSON::JSON_bool::~JSON_bool()
{
}
std::string JSON::JSON_bool::unparse(size_t) const
{
return value ? "true" : "false";
}
JSON::JSON_null::~JSON_null()
{
}
std::string JSON::JSON_null::unparse(size_t) const
{
return "null";
}
std::string
JSON::unparse() const
{
if (0 == this->m->value.getPointer())
{
return "null";
}
else
{
return this->m->value->unparse(0);
}
}
std::string
JSON::encode_string(std::string const& str)
{
std::string result;
size_t len = str.length();
for (size_t i = 0; i < len; ++i)
{
unsigned char ch = static_cast<unsigned char>(str.at(i));
switch (ch)
{
case '\\':
result += "\\\\";
break;
case '\"':
result += "\\\"";
break;
case '\b':
result += "\\b";
break;
case '\n':
result += "\\n";
break;
case '\r':
result += "\\r";
break;
case '\t':
result += "\\t";
break;
default:
if (ch < 32)
{
result += "\\u" + QUtil::int_to_string_base(ch, 16, 4);
}
else
{
result.append(1, ch);
}
}
}
return result;
}
JSON
JSON::makeDictionary()
{
return JSON(new JSON_dictionary());
}
JSON
JSON::addDictionaryMember(std::string const& key, JSON const& val)
{
JSON_dictionary* obj = dynamic_cast<JSON_dictionary*>(
this->m->value.getPointer());
if (0 == obj)
{
throw std::runtime_error(
"JSON::addDictionaryMember called on non-dictionary");
}
if (val.m->value.getPointer())
{
obj->members[encode_string(key)] = val.m->value;
}
else
{
obj->members[encode_string(key)] = new JSON_null();
}
return obj->members[encode_string(key)];
}
JSON
JSON::makeArray()
{
return JSON(new JSON_array());
}
JSON
JSON::addArrayElement(JSON const& val)
{
JSON_array* arr = dynamic_cast<JSON_array*>(
this->m->value.getPointer());
if (0 == arr)
{
throw std::runtime_error("JSON::addArrayElement called on non-array");
}
if (val.m->value.getPointer())
{
arr->elements.push_back(val.m->value);
}
else
{
arr->elements.push_back(new JSON_null());
}
return arr->elements.back();
}
JSON
JSON::makeString(std::string const& utf8)
{
return JSON(new JSON_string(utf8));
}
JSON
JSON::makeInt(long long int value)
{
return JSON(new JSON_number(value));
}
JSON
JSON::makeReal(double value)
{
return JSON(new JSON_number(value));
}
JSON
JSON::makeNumber(std::string const& encoded)
{
return JSON(new JSON_number(encoded));
}
JSON
JSON::makeBool(bool value)
{
return JSON(new JSON_bool(value));
}
JSON
JSON::makeNull()
{
return JSON(new JSON_null());
}
bool
JSON::checkSchema(JSON schema, std::list<std::string>& errors)
{
return checkSchemaInternal(this->m->value.getPointer(),
schema.m->value.getPointer(),
errors, "");
}
bool
JSON::checkSchemaInternal(JSON_value* this_v, JSON_value* sch_v,
std::list<std::string>& errors,
std::string prefix)
{
JSON_array* this_arr = dynamic_cast<JSON_array*>(this_v);
JSON_dictionary* this_dict = dynamic_cast<JSON_dictionary*>(this_v);
JSON_array* sch_arr = dynamic_cast<JSON_array*>(sch_v);
JSON_dictionary* sch_dict = dynamic_cast<JSON_dictionary*>(sch_v);
std::string err_prefix;
if (prefix.empty())
{
err_prefix = "top-level object";
}
else
{
err_prefix = "json key \"" + prefix + "\"";
}
if (sch_dict)
{
if (! this_dict)
{
QTC::TC("libtests", "JSON wanted dictionary");
errors.push_back(err_prefix + " is supposed to be a dictionary");
return false;
}
for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
sch_dict->members.begin();
iter != sch_dict->members.end(); ++iter)
{
std::string const& key = (*iter).first;
if (this_dict->members.count(key))
{
checkSchemaInternal(
this_dict->members[key].getPointer(),
(*iter).second.getPointer(),
errors, prefix + "." + key);
}
else
{
QTC::TC("libtests", "JSON key missing in object");
errors.push_back(
err_prefix + ": key \"" + key +
"\" is present in schema but missing in object");
}
}
for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
this_dict->members.begin();
iter != this_dict->members.end(); ++iter)
{
std::string const& key = (*iter).first;
if (sch_dict->members.count(key) == 0)
{
QTC::TC("libtests", "JSON key extra in object");
errors.push_back(
err_prefix + ": key \"" + key +
"\" is not present in schema but appears in object");
}
}
}
else if (sch_arr)
{
if (! this_arr)
{
QTC::TC("libtests", "JSON wanted array");
errors.push_back(err_prefix + " is supposed to be an array");
return false;
}
if (sch_arr->elements.size() != 1)
{
QTC::TC("libtests", "JSON schema array error");
errors.push_back(err_prefix +
" schema array contains other than one item");
return false;
}
int i = 0;
for (std::vector<PointerHolder<JSON_value> >::iterator iter =
this_arr->elements.begin();
iter != this_arr->elements.end(); ++iter, ++i)
{
checkSchemaInternal(
(*iter).getPointer(),
sch_arr->elements.at(0).getPointer(),
errors, prefix + "." + QUtil::int_to_string(i));
}
}
return errors.empty();
}