method

intern

v1_8_6_287 - Show latest stable - 0 notes - Class: String

intern() public

Returns the Symbol corresponding to str, creating the symbol if it did not previously exist. See Symbol#id2name.

   "Koala".intern         #=> :Koala
   s = 'cat'.to_sym       #=> :cat
   s == :cat              #=> true
   s = '@cat'.to_sym      #=> :@cat
   s == :@cat             #=> true

This can also be used to create symbols that cannot be represented using the :xxx notation.

   'cat and dog'.to_sym   #=> :"cat and dog"

Show source

/*
 *  call-seq:
 *     str.intern   => symbol
 *     str.to_sym   => symbol
 *  
 *  Returns the <code>Symbol</code> corresponding to <i>str</i>, creating the
 *  symbol if it did not previously exist. See <code>Symbol#id2name</code>.
 *     
 *     "Koala".intern         #=> :Koala
 *     s = 'cat'.to_sym       #=> :cat
 *     s == :cat              #=> true
 *     s = '@cat'.to_sym      #=> :@cat
 *     s == :@cat             #=> true
 *
 *  This can also be used to create symbols that cannot be represented using the
 *  <code>:xxx</code> notation.
 *     
 *     'cat and dog'.to_sym   #=> :"cat and dog"
 */

VALUE
rb_str_intern(s)
    VALUE s;
{
    volatile VALUE str = s;
    ID id;

    if (!RSTRING(str)->ptr || RSTRING(str)->len == 0) {
        rb_raise(rb_eArgError, "interning empty string");
    }
    if (strlen(RSTRING(str)->ptr) != RSTRING(str)->len)
        rb_raise(rb_eArgError, "symbol string may not contain `\\0'");
    if (OBJ_TAINTED(str) && rb_safe_level() >= 1 && !rb_sym_interned_p(str)) {
        rb_raise(rb_eSecurityError, "Insecure: can't intern tainted string");
    }
    id = rb_intern(RSTRING(str)->ptr);
    return ID2SYM(id);
}

intern

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