class JSON::Ext::Parser

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.

Public Class Methods

new(source, opts → {}) click to toggle source

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

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_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;
                        }
                        #ifndef HAVE_RB_SCAN_ARGS_OPTIONAL_HASH
                }
                #endif
        } else {
                json->max_nesting = 100;
                json->allow_nan = 0;
                json->create_additions = 0;
                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;
}

Public Instance Methods

parse() click to toggle source

Parses the current JSON text source and returns the complete data structure as a result.

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


        {
                cs = (int)JSON_start;
        }

        #line 851 "parser.rl"

        p = json->source;
        pe = p + json->len;

        {
                if ( p == pe )
                goto _test_eof;
                switch ( cs )
                {
                        case 1:
                        goto st_case_1;
                        case 0:
                        goto st_case_0;
                        case 10:
                        goto st_case_10;
                        case 2:
                        goto st_case_2;
                        case 3:
                        goto st_case_3;
                        case 4:
                        goto st_case_4;
                        case 5:
                        goto st_case_5;
                        case 6:
                        goto st_case_6;
                        case 7:
                        goto st_case_7;
                        case 8:
                        goto st_case_8;
                        case 9:
                        goto st_case_9;
                }
                goto st_out;
                st1:
                p+= 1;
                if ( p == pe )
                goto _test_eof1;
                st_case_1:
                switch( ( (*( p))) ) {
                        case 13: {
                                goto st1;
                        }
                        case 32: {
                                goto st1;
                        }
                        case 34: {
                                goto ctr2;
                        }
                        case 45: {
                                goto ctr2;
                        }
                        case 47: {
                                goto st6;
                        }
                        case 73: {
                                goto ctr2;
                        }
                        case 78: {
                                goto ctr2;
                        }
                        case 91: {
                                goto ctr2;
                        }
                        case 102: {
                                goto ctr2;
                        }
                        case 110: {
                                goto ctr2;
                        }
                        case 116: {
                                goto ctr2;
                        }
                        case 123: {
                                goto ctr2;
                        }
                }
                if ( ( (*( p))) > 10 ) {
                        if ( 48 <= ( (*( p))) && ( (*( p))) <= 57 ) {
                                goto ctr2;
                        }
                } else if ( ( (*( p))) >= 9 ) {
                        goto st1;
                }
                {
                        goto st0;
                }
                st_case_0:
                st0:
                cs = 0;
                goto _out;
                ctr2:
                {
                        #line 827 "parser.rl"

                        char *np = JSON_parse_value(json, p, pe, &result, 0);
                        if (np == NULL) { {p = p - 1; } {p+= 1; cs = 10; goto _out;} } else {p = (( np))-1;}

                }

                goto st10;
                st10:
                p+= 1;
                if ( p == pe )
                goto _test_eof10;
                st_case_10:
                switch( ( (*( p))) ) {
                        case 13: {
                                goto st10;
                        }
                        case 32: {
                                goto st10;
                        }
                        case 47: {
                                goto st2;
                        }
                }
                if ( 9 <= ( (*( p))) && ( (*( p))) <= 10 ) {
                        goto st10;
                }
                {
                        goto st0;
                }
                st2:
                p+= 1;
                if ( p == pe )
                goto _test_eof2;
                st_case_2:
                switch( ( (*( p))) ) {
                        case 42: {
                                goto st3;
                        }
                        case 47: {
                                goto st5;
                        }
                }
                {
                        goto st0;
                }
                st3:
                p+= 1;
                if ( p == pe )
                goto _test_eof3;
                st_case_3:
                if ( ( (*( p))) == 42 ) {
                        goto st4;
                }
                {
                        goto st3;
                }
                st4:
                p+= 1;
                if ( p == pe )
                goto _test_eof4;
                st_case_4:
                switch( ( (*( p))) ) {
                        case 42: {
                                goto st4;
                        }
                        case 47: {
                                goto st10;
                        }
                }
                {
                        goto st3;
                }
                st5:
                p+= 1;
                if ( p == pe )
                goto _test_eof5;
                st_case_5:
                if ( ( (*( p))) == 10 ) {
                        goto st10;
                }
                {
                        goto st5;
                }
                st6:
                p+= 1;
                if ( p == pe )
                goto _test_eof6;
                st_case_6:
                switch( ( (*( p))) ) {
                        case 42: {
                                goto st7;
                        }
                        case 47: {
                                goto st9;
                        }
                }
                {
                        goto st0;
                }
                st7:
                p+= 1;
                if ( p == pe )
                goto _test_eof7;
                st_case_7:
                if ( ( (*( p))) == 42 ) {
                        goto st8;
                }
                {
                        goto st7;
                }
                st8:
                p+= 1;
                if ( p == pe )
                goto _test_eof8;
                st_case_8:
                switch( ( (*( p))) ) {
                        case 42: {
                                goto st8;
                        }
                        case 47: {
                                goto st1;
                        }
                }
                {
                        goto st7;
                }
                st9:
                p+= 1;
                if ( p == pe )
                goto _test_eof9;
                st_case_9:
                if ( ( (*( p))) == 10 ) {
                        goto st1;
                }
                {
                        goto st9;
                }
                st_out:
                _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 854 "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() click to toggle source

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

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