Class: JSON::Ext::Parser

Inherits:
Object
  • Object
show all
Defined in:
ext/json/ext/parser/parser.c,
ext/json/ext/parser/parser.c

Overview

This is the JSON parser implemented as a C extension. It can be configured to be used by setting

JSON.parser = JSON::Ext::Parser

with the method parser= in JSON.

Instance Method Summary collapse

Constructor Details

#new(source, opts) ⇒ Object

Creates a new JSON::Ext::Parser instance for the string source.

It will be configured by the opts hash. opts can have the following keys:

opts can have the following keys:

  • max_nesting: The maximum depth of nesting allowed in the parsed data structures. Disable depth checking with :max_nesting => false|nil|0, it defaults to 100.

  • allow_nan: If set to true, allow NaN, Infinity and -Infinity in defiance of RFC 4627 to be parsed by the Parser. This option defaults to false.

  • symbolize_names: If set to true, returns symbols for the names (keys) in a JSON object. Otherwise strings are returned, which is also the default. It’s not possible to use this option in conjunction with the create_additions option.

  • create_additions: If set to false, the Parser doesn’t create additions even if a matching class and create_id was found. This option defaults to false.

  • object_class: Defaults to Hash. If another type is provided, it will be used instead of Hash to represent JSON objects. The type must respond to new without arguments, and return an object that respond to []=.

  • array_class: Defaults to Array If another type is provided, it will be used instead of Hash to represent JSON arrays. The type must respond to new without arguments, and return an object that respond to <<.

  • decimal_class: Specifies which class to use instead of the default

    (Float) when parsing decimal numbers. This class must accept a single
string argument in its constructor.



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# File 'ext/json/ext/parser/parser.c', line 1838

static VALUE cParser_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE source, opts;
    GET_PARSER_INIT;

    if (json->Vsource) {
        rb_raise(rb_eTypeError, "already initialized instance");
    }

    rb_check_arity(argc, 1, 2);
    source = argv[0];
    opts = Qnil;
    if (argc == 2) {
        opts = argv[1];
        Check_Type(argv[1], T_HASH);
        if (RHASH_SIZE(argv[1]) > 0) {
            opts = argv[1];
        }
    }

    if (!NIL_P(opts)) {
        VALUE tmp = ID2SYM(i_max_nesting);
        if (option_given_p(opts, tmp)) {
            VALUE max_nesting = rb_hash_aref(opts, tmp);
            if (RTEST(max_nesting)) {
                Check_Type(max_nesting, T_FIXNUM);
                json->max_nesting = FIX2INT(max_nesting);
            } else {
                json->max_nesting = 0;
            }
        } else {
            json->max_nesting = 100;
        }
        tmp = ID2SYM(i_allow_nan);
        if (option_given_p(opts, tmp)) {
            json->allow_nan = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
        } else {
            json->allow_nan = 0;
        }
        tmp = ID2SYM(i_symbolize_names);
        if (option_given_p(opts, tmp)) {
            json->symbolize_names = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
        } else {
            json->symbolize_names = 0;
        }
        tmp = ID2SYM(i_freeze);
        if (option_given_p(opts, tmp)) {
            json->freeze = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
        } else {
            json->freeze = 0;
        }
        tmp = ID2SYM(i_create_additions);
        if (option_given_p(opts, tmp)) {
            json->create_additions = RTEST(rb_hash_aref(opts, tmp));
        } else {
            json->create_additions = 0;
        }
        if (json->symbolize_names && json->create_additions) {
            rb_raise(rb_eArgError,
                "options :symbolize_names and :create_additions cannot be "
                " used in conjunction");
        }
        tmp = ID2SYM(i_create_id);
        if (option_given_p(opts, tmp)) {
            json->create_id = rb_hash_aref(opts, tmp);
        } else {
            json->create_id = rb_funcall(mJSON, i_create_id, 0);
        }
        tmp = ID2SYM(i_object_class);
        if (option_given_p(opts, tmp)) {
            json->object_class = rb_hash_aref(opts, tmp);
        } else {
            json->object_class = Qnil;
        }
        tmp = ID2SYM(i_array_class);
        if (option_given_p(opts, tmp)) {
            json->array_class = rb_hash_aref(opts, tmp);
        } else {
            json->array_class = Qnil;
        }
        tmp = ID2SYM(i_decimal_class);
        if (option_given_p(opts, tmp)) {
            json->decimal_class = rb_hash_aref(opts, tmp);
        } else {
            json->decimal_class = Qnil;
        }
        tmp = ID2SYM(i_match_string);
        if (option_given_p(opts, tmp)) {
            VALUE match_string = rb_hash_aref(opts, tmp);
            json->match_string = RTEST(match_string) ? match_string : Qnil;
        } else {
            json->match_string = Qnil;
        }
    } else {
        json->max_nesting = 100;
        json->allow_nan = 0;
        json->create_additions = 0;
        json->create_id = Qnil;
        json->object_class = Qnil;
        json->array_class = Qnil;
        json->decimal_class = Qnil;
    }
    source = convert_encoding(StringValue(source));
    StringValue(source);
    json->len = RSTRING_LEN(source);
    json->source = RSTRING_PTR(source);;
    json->Vsource = source;
    return self;
}

Instance Method Details

#parse ⇒ Object

Parses the current JSON text source and returns the complete data

structure as a result.
It raises JSON::ParserError if fail to parse.



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# File 'ext/json/ext/parser/parser.c', line 1967

static VALUE cParser_parse(VALUE self)
{
    char *p, *pe;
    int cs = EVIL;
    VALUE result = Qnil;
    GET_PARSER;


#line 1976 "parser.c"
	{
	cs = JSON_start;
	}

#line 875 "parser.rl"
    p = json->source;
    pe = p + json->len;

#line 1985 "parser.c"
	{
	if ( p == pe )
		goto _test_eof;
	switch ( cs )
	{
st1:
	if ( ++p == pe )
		goto _test_eof1;
case 1:
	switch( (*p) ) {
		case 13: goto st1;
		case 32: goto st1;
		case 34: goto tr2;
		case 45: goto tr2;
		case 47: goto st6;
		case 73: goto tr2;
		case 78: goto tr2;
		case 91: goto tr2;
		case 102: goto tr2;
		case 110: goto tr2;
		case 116: goto tr2;
		case 123: goto tr2;
	}
	if ( (*p) > 10 ) {
		if ( 48 <= (*p) && (*p) <= 57 )
			goto tr2;
	} else if ( (*p) >= 9 )
		goto st1;
	goto st0;
st0:
cs = 0;
	goto _out;
tr2:
#line 850 "parser.rl"
	{
        char *np = JSON_parse_value(json, p, pe, &result, 0);
        if (np == NULL) { p--; {p++; cs = 10; goto _out;} } else {p = (( np))-1;}
    }
	goto st10;
st10:
	if ( ++p == pe )
		goto _test_eof10;
case 10:
#line 2029 "parser.c"
	switch( (*p) ) {
		case 13: goto st10;
		case 32: goto st10;
		case 47: goto st2;
	}
	if ( 9 <= (*p) && (*p) <= 10 )
		goto st10;
	goto st0;
st2:
	if ( ++p == pe )
		goto _test_eof2;
case 2:
	switch( (*p) ) {
		case 42: goto st3;
		case 47: goto st5;
	}
	goto st0;
st3:
	if ( ++p == pe )
		goto _test_eof3;
case 3:
	if ( (*p) == 42 )
		goto st4;
	goto st3;
st4:
	if ( ++p == pe )
		goto _test_eof4;
case 4:
	switch( (*p) ) {
		case 42: goto st4;
		case 47: goto st10;
	}
	goto st3;
st5:
	if ( ++p == pe )
		goto _test_eof5;
case 5:
	if ( (*p) == 10 )
		goto st10;
	goto st5;
st6:
	if ( ++p == pe )
		goto _test_eof6;
case 6:
	switch( (*p) ) {
		case 42: goto st7;
		case 47: goto st9;
	}
	goto st0;
st7:
	if ( ++p == pe )
		goto _test_eof7;
case 7:
	if ( (*p) == 42 )
		goto st8;
	goto st7;
st8:
	if ( ++p == pe )
		goto _test_eof8;
case 8:
	switch( (*p) ) {
		case 42: goto st8;
		case 47: goto st1;
	}
	goto st7;
st9:
	if ( ++p == pe )
		goto _test_eof9;
case 9:
	if ( (*p) == 10 )
		goto st1;
	goto st9;
	}
	_test_eof1: cs = 1; goto _test_eof;
	_test_eof10: cs = 10; goto _test_eof;
	_test_eof2: cs = 2; goto _test_eof;
	_test_eof3: cs = 3; goto _test_eof;
	_test_eof4: cs = 4; goto _test_eof;
	_test_eof5: cs = 5; goto _test_eof;
	_test_eof6: cs = 6; goto _test_eof;
	_test_eof7: cs = 7; goto _test_eof;
	_test_eof8: cs = 8; goto _test_eof;
	_test_eof9: cs = 9; goto _test_eof;

	_test_eof: {}
	_out: {}
	}

#line 878 "parser.rl"

    if (cs >= JSON_first_final && p == pe) {
        return result;
    } else {
        raise_parse_error("unexpected token at '%s'", p);
        return Qnil;
    }
}

#source ⇒ Object

Returns a copy of the current source string, that was used to construct this Parser.



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# File 'ext/json/ext/parser/parser.c', line 2172

static VALUE cParser_source(VALUE self)
{
    GET_PARSER;
    return rb_str_dup(json->Vsource);
}