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<?php |
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namespace gulch\Minify\Processor; |
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use gulch\Minify\Contract\ProcessorInterface; |
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class InlineJavascriptMinifier implements ProcessorInterface |
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{ |
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public function process(string $buffer): string |
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{ |
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if (\strlen($buffer) === 0) { |
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return ''; |
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} |
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$javascript_minified = []; |
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\preg_match_all('{<script.+</script>}msU', $buffer, $script_blocks); |
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// Minify the javascript in <script> tags. |
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foreach ($script_blocks[0] as $block) { |
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$javascript_minified[] = $this->minifyJavascript($block); |
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} |
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if (\sizeof($javascript_minified)) { |
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$buffer = \str_replace($script_blocks[0], $javascript_minified, $buffer); |
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} |
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return $buffer; |
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} |
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private function minifyJavascript(string $buffer): string |
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{ |
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$tags = ['close' => \strrchr($buffer, '<')]; |
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$open_length = \strpos($buffer, '>') + 1; |
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$tags['open'] = \substr($buffer, 0, $open_length); |
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$buffer = \substr($buffer, $open_length, -\strlen($tags['close'])); |
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// Strip spaces from the tags |
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$tags = \preg_replace('/\s{2,}/', ' ', $tags); |
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// Catch all string literals and comment blocks |
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if (\preg_match_all( |
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'#((?:((?<!\\\)\'|")|(/\*)|(//)).*(?(2)(?<!\\\)\2|(?(3)\*/|\n)))#msuUS', |
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$buffer, |
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$match, |
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\PREG_OFFSET_CAPTURE |
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)) { |
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$js_literals = $js_code = []; |
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for ($match = $match[0], $c = \count($match), $i = $pos = $offset = 0; $i < $c; $i++) { |
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$js_code[$pos++] = \trim(\substr($buffer, $offset, $match[$i][1] - $offset)); |
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$offset = $match[$i][1] + \strlen($match[$i][0]); |
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// Save only if we haven't matched a comment block |
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if ($match[$i][0][0] !== '/') { |
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$js_literals[$pos++] = \array_shift($match[$i]); |
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} |
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} |
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$js_code[$pos] = \substr($buffer, $offset); |
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// $match might be quite large, so free it up together with other vars that we no longer need |
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unset($match, $offset, $pos); |
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} else { |
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$js_code = [$buffer]; |
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$js_literals = []; |
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} |
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// Standartize new lines |
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$js_code = \str_replace(["\r\n", "\r"], "\n", $js_code); |
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$patterns = [ |
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// Remove spaces following and preceeding JS-wise non-special & non-word characters |
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'#\s*([!\#%&()*+,\-./:;<=>?@\[\]^`{|}~])\s*#' => '$1', |
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// Reduce the remaining multiple whitespace characters to a single space |
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'#\s{2,}#' => ' ', |
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]; |
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$js_code = \preg_replace( |
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\array_keys($patterns), |
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\array_values($patterns), |
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$js_code |
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); |
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// Glue back JS quoted strings |
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$js_code += $js_literals; |
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\ksort($js_code); |
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$buffer = \implode($js_code); |
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return $tags['open'] . $buffer . $tags['close']; |
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} |
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} |
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gulch /
minify
