PhpPeg\RuleSet::compile PHP Method

    function compile($indent, $rulestr)
    {
        $indentrx = '@^' . preg_quote($indent) . '@';
        $out = [];
        $block = [];
        foreach (preg_split('/\\r\\n|\\r|\\n/', $rulestr) as $line) {
            // Ignore blank lines
            if (!trim($line)) {
                continue;
            }
            // Ignore comments
            if (preg_match('/^[\\x20|\\t]+#/', $line)) {
                continue;
            }
            // Strip off indent
            if (!empty($indent)) {
                if (strpos($line, $indent) === 0) {
                    $line = substr($line, strlen($indent));
                } else {
                    user_error('Non-blank line with inconsistent index in parser block', E_USER_ERROR);
                }
            }
            // Any indented line, add to current set of lines
            if (preg_match('/^\\x20|\\t/', $line)) {
                $block[] = $line;
            } else {
                if (count($block)) {
                    $this->addRule($indent, $block, $out);
                }
                $block = [$line];
            }
        }
        // Any unfinished block add a rule for
        if (count($block)) {
            $this->addRule($indent, $block, $out);
        }
        // And return the compiled version
        return implode('', $out);
    }