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<?php |
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/* @description Transformation Style Sheets - Revolutionising PHP templating * |
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* @author Tom Butler [email protected] * |
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* @copyright 2015 Tom Butler <[email protected]> | https://r.je/ * |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License * |
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* @version 1.0 */ |
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namespace Transphporm\Parser; |
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/** Parses a .tss file into individual rules, each rule has a query e,g, `ul li` and a set of rules e.g. `display: none; bind: iteration(id);` */ |
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class Sheet { |
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private $tss; |
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private $baseDir; |
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private $valueParser; |
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private $xPath; |
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private $tokenizer; |
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public function __construct($tss, $baseDir, CssToXpath $xPath, Value $valueParser) { |
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$this->tss = $this->stripComments($tss, '//', "\n"); |
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$this->tss = $this->stripComments($this->tss, '/*', '*/'); |
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$this->tokenizer = new Tokenizer($this->tss); |
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$this->tss = $this->tokenizer->getTokens(); |
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$this->baseDir = $baseDir; |
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$this->xPath = $xPath; |
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$this->valueParser = $valueParser; |
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} |
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public function parse($indexStart = 0) { |
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$rules = []; |
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foreach (new TokenFilterIterator($this->tss, [Tokenizer::WHITESPACE]) as $token) { |
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if ($processing = $this->processingInstructions($token, count($rules)+$indexStart)) { |
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$this->tss->skip($processing['skip']+1); |
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$rules = array_merge($rules, $processing['rules']); |
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continue; |
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} |
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$selector = $this->tss->from($token['type'], true)->to(Tokenizer::OPEN_BRACE); |
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$this->tss->skip(count($selector)); |
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if (count($selector) === 0) break; |
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$newRules = $this->cssToRules($selector, count($rules)+$indexStart, $this->getProperties($this->tss->current()['value'])); |
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$rules = $this->writeRule($rules, $newRules); |
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} |
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usort($rules, [$this, 'sortRules']); |
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$this->checkError($rules); |
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return $rules; |
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} |
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private function checkError($rules) { |
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if (empty($rules) && count($this->tss) > 0) throw new \Exception('No TSS rules parsed'); |
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} |
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private function CssToRules($selector, $index, $properties) { |
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$parts = $selector->trim()->splitOnToken(Tokenizer::ARG); |
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$rules = []; |
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foreach ($parts as $part) { |
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$part = $part->trim(); |
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$rules[$this->tokenizer->serialize($part)] = new \Transphporm\Rule($this->xPath->getXpath($part), $this->xPath->getPseudo($part), $this->xPath->getDepth($part), $this->baseDir, $index++); |
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$rules[$this->tokenizer->serialize($part)]->properties = $properties; |
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} |
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return $rules; |
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} |
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private function writeRule($rules, $newRules) { |
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foreach ($newRules as $selector => $newRule) { |
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if (isset($rules[$selector])) { |
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$newRule->properties = array_merge($rules[$selector]->properties, $newRule->properties); |
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} |
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$rules[$selector] = $newRule; |
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} |
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return $rules; |
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} |
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private function processingInstructions($token, $indexStart) { |
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if ($token['type'] !== Tokenizer::AT_SIGN) return false; |
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$tokens = $this->tss->from(Tokenizer::AT_SIGN, false)->to(Tokenizer::SEMI_COLON, false); |
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$funcName = $tokens->from(Tokenizer::NAME, true)->read(); |
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$args = $this->valueParser->parseTokens($tokens->from(Tokenizer::NAME)); |
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$rules = $this->$funcName($args, $indexStart); |
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return ['skip' => count($tokens)+1, 'rules' => $rules]; |
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} |
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private function import($args, $indexStart) { |
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$fileName = $args[0]; |
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$sheet = new Sheet(file_get_contents($this->baseDir . $fileName), dirname(realpath($this->baseDir . $fileName)) . DIRECTORY_SEPARATOR, $this->xPath, $this->valueParser); |
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return $sheet->parse($indexStart); |
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} |
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private function sortRules($a, $b) { |
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//If they have the same depth, compare on index |
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if ($a->depth === $b->depth) return $a->index < $b->index ? -1 : 1; |
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return ($a->depth < $b->depth) ? -1 : 1; |
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} |
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private function stripComments($str, $open, $close) { |
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$pos = 0; |
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while (($pos = strpos($str, $open, $pos)) !== false) { |
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$end = strpos($str, $close, $pos); |
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if ($end === false) break; |
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$str = substr_replace($str, '', $pos, $end-$pos+strlen($close)); |
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} |
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return $str; |
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} |
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private function getProperties($tokens) { |
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$rules = $tokens->splitOnToken(Tokenizer::SEMI_COLON); |
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$return = []; |
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foreach ($rules as $rule) { |
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$name = $rule->from(Tokenizer::NAME, true)->to(Tokenizer::COLON)->read(); |
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$return[$name] = $rule->from(Tokenizer::COLON)->trim(); |
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} |
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return $return; |
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} |
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} |
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Level-2 /
Transphporm
