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.

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

  • array_class: Defaults to Array



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# File 'ext/json/ext/parser/parser.c', line 1746

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");
    }
#ifdef HAVE_RB_SCAN_ARGS_OPTIONAL_HASH
    rb_scan_args(argc, argv, "1:", &source, &opts);
#else
    rb_scan_args(argc, argv, "11", &source, &opts);
#endif
    if (!NIL_P(opts)) {
#ifndef HAVE_RB_SCAN_ARGS_OPTIONAL_HASH
        opts = rb_convert_type(opts, T_HASH, "Hash", "to_hash");
        if (NIL_P(opts)) {
            rb_raise(rb_eArgError, "opts needs to be like a hash");
        } else {
#endif
            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_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;
            }
#ifndef HAVE_RB_SCAN_ARGS_OPTIONAL_HASH
        }
#endif
    } else {
        json->max_nesting = 100;
        json->allow_nan = 0;
        json->create_additions = 1;
        json->create_id = rb_funcall(mJSON, i_create_id, 0);
        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.



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# File 'ext/json/ext/parser/parser.c', line 1870

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


#line 1879 "parser.c"
	{
	cs = JSON_start;
	}

#line 778 "parser.rl"
  p = json->source;
  pe = p + json->len;

#line 1888 "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 754 "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 1932 "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 781 "parser.rl"

  if (cs >= JSON_first_final && p == pe) {
    return result;
  } else {
    rb_enc_raise(EXC_ENCODING eParserError, "%u: unexpected token at '%s'", __LINE__, 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 2079

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