# 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 → {})
Source

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

        rb_check_arity(argc, 1, 2);

        parser_init(json, argv[0], argc == 2 ? argv[1] : Qnil);
        return self;
    }

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.

parse (p1, p2)
Source

    static VALUE cParser_m_parse(VALUE klass, VALUE source, VALUE opts)
    {
        char *p, *pe;
        int cs = EVIL;
        VALUE result = Qnil;

        JSON_Parser _parser = {0};
        JSON_Parser *json = &_parser;
        parser_init(json, source, opts);

        char stack_buffer[FBUFFER_STACK_SIZE];
        fbuffer_stack_init(&json->fbuffer, FBUFFER_INITIAL_LENGTH_DEFAULT, stack_buffer, FBUFFER_STACK_SIZE);

        VALUE rvalue_stack_buffer[RVALUE_STACK_INITIAL_CAPA];
        rvalue_stack stack = {
            .type = RVALUE_STACK_STACK_ALLOCATED,
            .ptr = rvalue_stack_buffer,
            .capa = RVALUE_STACK_INITIAL_CAPA,
        };
        json->stack = &stack;

    #line 2957 "parser.c"
            {
            cs = JSON_start;
            }

    #line 1323 "parser.rl"
        p = json->source;
        pe = p + json->len;

    #line 2966 "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 1249 "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 3010 "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 1326 "parser.rl"

        if (json->stack_handle) {
            rvalue_stack_eagerly_release(json->stack_handle);
        }

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

### Public Instance Methods

parse()
Source

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

        char stack_buffer[FBUFFER_STACK_SIZE];
        fbuffer_stack_init(&json->fbuffer, FBUFFER_INITIAL_LENGTH_DEFAULT, stack_buffer, FBUFFER_STACK_SIZE);

        VALUE rvalue_stack_buffer[RVALUE_STACK_INITIAL_CAPA];
        rvalue_stack stack = {
            .type = RVALUE_STACK_STACK_ALLOCATED,
            .ptr = rvalue_stack_buffer,
            .capa = RVALUE_STACK_INITIAL_CAPA,
        };
        json->stack = &stack;

    #line 2779 "parser.c"
            {
            cs = JSON_start;
            }

    #line 1285 "parser.rl"
        p = json->source;
        pe = p + json->len;

    #line 2788 "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 1249 "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 2832 "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 1288 "parser.rl"

        if (json->stack_handle) {
            rvalue_stack_eagerly_release(json->stack_handle);
        }

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

Parses the current `JSON` text source and returns the complete data structure as a result. It raises `JSON::ParserError` if fail to parse.

source()
Source

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

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