method

eval

v1_9_2_180 - Show latest stable - Class: Kernel

eval(p1, p2 = v2, p3 = v3, p4 = v4)

public

Evaluates the Ruby expression(s) in string. If binding is given, which must be a Binding object, the evaluation is performed in its context. If the optional filename and lineno parameters are present, they will be used when reporting syntax errors.

def getBinding(str)
  return binding
end
str = "hello"
eval "str + ' Fred'"                      #=> "hello Fred"
eval "str + ' Fred'", getBinding("bye")   #=> "bye Fred"

VALUE
rb_f_eval(int argc, VALUE *argv, VALUE self)
{
    VALUE src, scope, vfile, vline;
    const char *file = "(eval)";
    int line = 1;

    rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
    if (rb_safe_level() >= 4) {
        StringValue(src);
        if (!NIL_P(scope) && !OBJ_TAINTED(scope)) {
            rb_raise(rb_eSecurityError,
                     "Insecure: can't modify trusted binding");
        }
    }
    else {
        SafeStringValue(src);
    }
    if (argc >= 3) {
        StringValue(vfile);
    }
    if (argc >= 4) {
        line = NUM2INT(vline);
    }

    if (!NIL_P(vfile))
        file = RSTRING_PTR(vfile);
    return eval_string(self, src, scope, file, line);
}

eval

Related methods