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<?php |
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namespace Ortic\Css2Less; |
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use Ortic\Css2Less\tokens\LessRuleList; |
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use Ortic\Css2Less\tokens\LessRule; |
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class Css2Less |
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{ |
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/** |
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* @var string $cssContent |
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*/ |
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protected $cssContent; |
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/** |
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* @var \CssParser $parser |
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*/ |
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protected $parser; |
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/** |
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* Tokens. |
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* |
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* @var array |
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*/ |
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protected $tokens = []; |
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/** |
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* Nested CSS tree |
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* |
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* @var array |
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*/ |
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protected $lessTree = []; |
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/** |
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* List of CSS rules |
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* |
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* @var LessRuleList |
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*/ |
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protected $ruleSetList; |
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/** |
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* Variables. |
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* |
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* @var array |
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*/ |
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protected $variables = []; |
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/** |
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* Create a new parser object, use parameter to specify CSS you |
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* wish to convert into a LESS file |
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* |
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* @param string $cssContent |
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*/ |
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public function __construct($cssContent) |
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{ |
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$this->cssContent = $cssContent; |
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$this->parser = new \CssParser($this->cssContent); |
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} |
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/** |
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* Iterates through all tokens and extracts the values into variables |
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*/ |
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protected function extractVariables() |
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{ |
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$properties = ['color', 'font-family']; |
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foreach ($properties as $property) { |
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$this->variables[$property] = []; |
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} |
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foreach ($this->tokens as $token) { |
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if ($token instanceof \CssRulesetDeclarationToken && in_array($token->Property, $properties)) { |
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if (!array_key_exists($token->Value, $this->variables[$token->Property])) { |
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$this->variables[$token->Property][$token->Value] = $token->Property . '_' . (count($this->variables[$token->Property]) + 1); |
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} |
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$token->Value = '@' . $this->variables[$token->Property][$token->Value]; |
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} |
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} |
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} |
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/** |
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* Returns a string containing all variables to be printed in the output |
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* |
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* @return string |
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*/ |
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protected function getVariables() |
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{ |
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$return = ''; |
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foreach ($this->variables as $properties) { |
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foreach ($properties as $variable => $property) { |
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$return .= "@{$property}: {$variable};\n"; |
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} |
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} |
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$return .= "\n"; |
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return $return; |
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} |
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/** |
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* Returns a string containing the LESS content matching the CSS input |
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* @return string |
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*/ |
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public function getLess($extractVariables = false) |
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{ |
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$this->tokens = $this->parser->getTokens(); |
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// extract variables |
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if ($extractVariables) { |
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$this->extractVariables(); |
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} |
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$this->buildNestedTree(); |
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$return = ''; |
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// print variables |
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if ($extractVariables) { |
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$return .= $this->getVariables(); |
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} |
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foreach ($this->lessTree as $node) { |
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// @TODO this format method shouldn't be in this class.. |
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$return .= $this->ruleSetList->formatTokenAsLess($node) . "\n"; |
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} |
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$return .= $this->ruleSetList->lessify(); |
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return $return; |
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} |
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/** |
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* Build a nested tree based on the flat CSS tokens |
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*/ |
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protected function buildNestedTree() |
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{ |
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// this variable is true, if we're within a ruleset, e.g. p { .. here .. } |
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// we have to normalize them |
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$withinRulset = false; |
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$ruleSet = null; |
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$this->ruleSetList = new LessRuleList(); |
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foreach ($this->tokens as $token) { |
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// we have to skip some tokens, their information is redundant |
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if ($token instanceof \CssAtMediaStartToken || |
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$token instanceof \CssAtMediaEndToken |
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) { |
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continue; |
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} |
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// we have to build a hierarchy with CssRulesetStartToken, CssRulesetEndToken |
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if ($token instanceof \CssRulesetStartToken) { |
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$withinRulset = true; |
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$ruleSet = new LessRule($token->Selectors); |
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} elseif ($token instanceof \CssRulesetEndToken) { |
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$withinRulset = false; |
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if ($ruleSet) { |
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$this->ruleSetList->addRule($ruleSet); |
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} |
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$ruleSet = null; |
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} else { |
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// as long as we're in a ruleset, we're adding all token to a custom array |
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// this will be lessified once we've found CssRulesetEndToken and then added |
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// to the actual $lessTree variable |
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if ($withinRulset) { |
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$ruleSet->addToken($token); |
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} else { |
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$this->lessTree[] = $token; |
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} |
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} |
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} |
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} |
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} |
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ortic /
css2less
