Module: SafeIntern

Defined in:
lib/safe_intern/nil_patch.rb,
lib/safe_intern/exception_patch.rb,
ext/symbol_defined/symbol_defined.c

Overview

Copyright © 2014 Jan Rusnacko

This copyrighted material is made available to anyone wishing to use, modify, copy, or redistribute it subject to the terms and conditions of the MIT license.

Defined Under Namespace

Modules: ExceptionPatch, NilPatch

Class Method Summary collapse

Class Method Details

.symbol_defined?(str) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/symbol_defined/symbol_defined.c', line 26

VALUE
symbol_defined(VALUE self, VALUE str)
{
    int i;
    VALUE string;
    st_data_t data;
    
    ID to_s;
    VALUE symbols;

    to_s = rb_intern("to_s");
    // extremely slow, but necessary to see when new symbol has been added
    symbols = rb_sym_all_symbols();

    if(cached_symbols == NULL || cached_symbols->num_entries != RARRAY_LEN(symbols)){
        cached_symbols = st_init_strtable_with_size(2000);
        for (i = 0; i < RARRAY_LEN(symbols); i++)
        {
            string = rb_funcall(rb_ary_entry(symbols, i), to_s, 0, NULL);
            st_add_direct(cached_symbols, (st_data_t)StringValueCStr(string), NULL);
        }
    }

    if (st_lookup(cached_symbols, StringValueCStr(str), &data)) {
        return Qtrue;
    } else {
        return Qfalse;
    }
}