PhpPeg\Rule::compile PHP Method

    function compile($indent)
    {
        $function_name = $this->function_name($this->name);
        // Build the typestack
        $typestack = [];
        $class = $this;
        do {
            $typestack[] = $this->function_name($class->name);
        } while ($class = $class->extends);
        $typestack = "array('" . implode("','", $typestack) . "')";
        // Build an array of additional arguments to add to result node (if any)
        if (empty($this->arguments)) {
            $arguments = 'null';
        } else {
            $arguments = "array(";
            foreach ($this->arguments as $k => $v) {
                $arguments .= "'{$k}' => '{$v}'";
            }
            $arguments .= ")";
        }
        $match = PHPBuilder::build();
        $match->l("protected \$match_{$function_name}_typestack = {$typestack};");
        $match->b("function match_{$function_name} (\$stack = array())", '$matchrule = "' . $function_name . '"; $result = $this->construct($matchrule, $matchrule, ' . $arguments . ');', $this->parsed->compile()->replace(['MATCH' => 'return $this->finalise($result);', 'FAIL' => 'return FALSE;']));
        $functions = [];
        foreach ($this->functions as $name => $function) {
            $function_name = $this->function_name(preg_match('/^_/', $name) ? $this->name . $name : $this->name . '_' . $name);
            $functions[] = implode(PHP_EOL, ['function ' . $function_name . ' ' . $function]);
        }
        // print_r( $match ) ; return '' ;
        return $match->render(NULL, $indent) . PHP_EOL . PHP_EOL . implode(PHP_EOL, $functions);
    }