variant variant_from_stream( T& in, uint32_t depth )
{
depth++;
FC_ASSERT( depth <= JSON_MAX_RECURSION_DEPTH );
skip_white_space( in, depth );
variant var;
while( true )
{
signed char c = in.peek();
switch( c )
{
case ' ':
case '\t':
case '\n':
case '\r':
in.get();
continue;
case '"':
return stringFromStream( in, depth );
case '{':
return objectFromStream<T, parser_type>( in, depth );
case '[':
return arrayFromStream<T, parser_type>( in, depth );
case '-':
case '.':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return number_from_stream<T, parser_type>( in, depth );
// null, true, false, or 'warning' / string
case 'n':
case 't':
case 'f':
return token_from_stream( in, depth );
case 0x04: // ^D end of transmission
case EOF:
case 0:
FC_THROW_EXCEPTION( eof_exception, "unexpected end of file" );
default:
FC_THROW_EXCEPTION( parse_error_exception, "Unexpected char '${c}' in \"${s}\"",
("c", c)("s", stringFromToken( in, depth )) );
}
}
return variant();
}
variant_object objectFromStream( T& in, uint32_t depth )
{
depth++;
FC_ASSERT( depth <= JSON_MAX_RECURSION_DEPTH );
mutable_variant_object obj;
try
{
char c = in.peek();
if( c != '{' )
FC_THROW_EXCEPTION( parse_error_exception,
"Expected '{', but read '${char}'",
("char",string(&c, &c + 1)) );
in.get();
skip_white_space( in, depth );
while( in.peek() != '}' )
{
if( in.peek() == ',' )
{
in.get();
continue;
}
if( skip_white_space( in, depth ) ) continue;
string key = stringFromStream( in, depth );
skip_white_space( in, depth );
if( in.peek() != ':' )
{
FC_THROW_EXCEPTION( parse_error_exception, "Expected ':' after key \"${key}\"",
("key", key) );
}
in.get();
auto val = variant_from_stream<T, parser_type>( in, depth );
obj(std::move(key),std::move(val));
skip_white_space( in, depth );
}
if( in.peek() == '}' )
{
in.get();
return obj;
}
FC_THROW_EXCEPTION( parse_error_exception, "Expected '}' after ${variant}", ("variant", obj ) );
}
catch( const fc::eof_exception& e )
{
FC_THROW_EXCEPTION( parse_error_exception, "Unexpected EOF: ${e}", ("e", e.to_detail_string() ) );
}
catch( const std::ios_base::failure& e )
{
FC_THROW_EXCEPTION( parse_error_exception, "Unexpected EOF: ${e}", ("e", e.what() ) );
} FC_RETHROW_EXCEPTIONS( warn, "Error parsing object" );
}
variant variant_from_stream( T& in, uint32_t max_depth )
{
if( max_depth == 0 )
FC_THROW_EXCEPTION( parse_error_exception, "Too many nested items in JSON input!" );
skip_white_space(in);
signed char c = in.peek();
switch( c )
{
case '"':
return stringFromStream( in );
case '{':
return objectFromStream<T, parser_type>( in, max_depth - 1 );
case '[':
return arrayFromStream<T, parser_type>( in, max_depth - 1 );
case '-':
case '.':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return number_from_stream<T, parser_type>( in );
// null, true, false, or 'warning' / string
case 'n':
case 't':
case 'f':
return token_from_stream( in );
case 0x04: // ^D end of transmission
case EOF:
FC_THROW_EXCEPTION( eof_exception, "unexpected end of file" );
case 0:
if( parser_type == fc::json::broken_nul_parser )
return variant();
FALLTHROUGH
default:
FC_THROW_EXCEPTION( parse_error_exception, "Unexpected char '${c}' in \"${s}\"",
("c", c)("s", stringFromToken(in)) );
}
}
Object * Read::readAtom(std::istream& stream) {
std::string stringFromStream(std::istreambuf_iterator<char>(stream), {});;
std::string read = getWord(stringFromStream);
if (isNumber(read)) {
Number * number = new Number(std::stoi(read));
return number;
}
if (isString(read)) {
String * string = new String(read.substr(1, read.size() - 2));
return string;
}
Symbol * symbol = symbolsList.findSymbol(read);
if (symbol)
return symbol;
Symbol * newSymbol = new Symbol(read, NULL);
return newSymbol;
}
variant_object objectFromStream( T& in, uint32_t max_depth )
{
std::function<std::string(T&)> get_key = []( T& in ){ return stringFromStream( in ); };
std::function<variant(T&)> get_value = [max_depth]( T& in ){ return variant_from_stream<T, parser_type>( in, max_depth ); };
return objectFromStreamBase<T>( in, get_key, get_value );
}