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<?php
/**
* Ruleset
*
* @package Less
* @subpackage tree
*/
class Less_Tree_Ruleset extends Less_Tree{
protected $lookups;
public $_variables;
public $_rulesets;
public $strictImports;
public $selectors;
public $rules;
public $root;
public $allowImports;
public $paths;
public $firstRoot;
public $type = 'Ruleset';
public $multiMedia;
public $allExtends;
public $ruleset_id;
public $originalRuleset;
public $first_oelements;
public function SetRulesetIndex(){
$this->ruleset_id = Less_Parser::$next_id++;
$this->originalRuleset = $this->ruleset_id;
if( $this->selectors ){
foreach($this->selectors as $sel){
if( $sel->_oelements ){
$this->first_oelements[$sel->_oelements[0]] = true;
}
}
}
}
public function __construct($selectors, $rules, $strictImports = null){
$this->selectors = $selectors;
$this->rules = $rules;
$this->lookups = array();
$this->strictImports = $strictImports;
$this->SetRulesetIndex();
}
public function accept( $visitor ){
if( $this->paths ){
$paths_len = count($this->paths);
for($i = 0,$paths_len; $i < $paths_len; $i++ ){
$this->paths[$i] = $visitor->visitArray($this->paths[$i]);
}
}elseif( $this->selectors ){
$this->selectors = $visitor->visitArray($this->selectors);
}
if( $this->rules ){
$this->rules = $visitor->visitArray($this->rules);
}
}
public function compile($env){
$ruleset = $this->PrepareRuleset($env);
// Store the frames around mixin definitions,
// so they can be evaluated like closures when the time comes.
$rsRuleCnt = count($ruleset->rules);
for( $i = 0; $i < $rsRuleCnt; $i++ ){
if( $ruleset->rules[$i] instanceof Less_Tree_Mixin_Definition || $ruleset->rules[$i] instanceof Less_Tree_DetachedRuleset ){
$ruleset->rules[$i] = $ruleset->rules[$i]->compile($env);
}
}
$mediaBlockCount = 0;
if( $env instanceof Less_Environment ){
$mediaBlockCount = count($env->mediaBlocks);
}
// Evaluate mixin calls.
$this->EvalMixinCalls( $ruleset, $env, $rsRuleCnt );
// Evaluate everything else
for( $i=0; $i<$rsRuleCnt; $i++ ){
if(! ($ruleset->rules[$i] instanceof Less_Tree_Mixin_Definition || $ruleset->rules[$i] instanceof Less_Tree_DetachedRuleset) ){
$ruleset->rules[$i] = $ruleset->rules[$i]->compile($env);
}
}
// Evaluate everything else
for( $i=0; $i<$rsRuleCnt; $i++ ){
$rule = $ruleset->rules[$i];
// for rulesets, check if it is a css guard and can be removed
if( $rule instanceof Less_Tree_Ruleset && $rule->selectors && count($rule->selectors) === 1 ){
// check if it can be folded in (e.g. & where)
if( $rule->selectors[0]->isJustParentSelector() ){
array_splice($ruleset->rules,$i--,1);
$rsRuleCnt--;
for($j = 0; $j < count($rule->rules); $j++ ){
$subRule = $rule->rules[$j];
if( !($subRule instanceof Less_Tree_Rule) || !$subRule->variable ){
array_splice($ruleset->rules, ++$i, 0, array($subRule));
$rsRuleCnt++;
}
}
}
}
}
// Pop the stack
$env->shiftFrame();
if ($mediaBlockCount) {
$len = count($env->mediaBlocks);
for($i = $mediaBlockCount; $i < $len; $i++ ){
$env->mediaBlocks[$i]->bubbleSelectors($ruleset->selectors);
}
}
return $ruleset;
}
/**
* Compile Less_Tree_Mixin_Call objects
*
* @param Less_Tree_Ruleset $ruleset
* @param integer $rsRuleCnt
*/
private function EvalMixinCalls( $ruleset, $env, &$rsRuleCnt ){
for($i=0; $i < $rsRuleCnt; $i++){
$rule = $ruleset->rules[$i];
if( $rule instanceof Less_Tree_Mixin_Call ){
$rule = $rule->compile($env);
$temp = array();
foreach($rule as $r){
if( ($r instanceof Less_Tree_Rule) && $r->variable ){
// do not pollute the scope if the variable is
// already there. consider returning false here
// but we need a way to "return" variable from mixins
if( !$ruleset->variable($r->name) ){
$temp[] = $r;
}
}else{
$temp[] = $r;
}
}
$temp_count = count($temp)-1;
array_splice($ruleset->rules, $i, 1, $temp);
$rsRuleCnt += $temp_count;
$i += $temp_count;
$ruleset->resetCache();
}elseif( $rule instanceof Less_Tree_RulesetCall ){
$rule = $rule->compile($env);
$rules = array();
foreach($rule->rules as $r){
if( ($r instanceof Less_Tree_Rule) && $r->variable ){
continue;
}
$rules[] = $r;
}
array_splice($ruleset->rules, $i, 1, $rules);
$temp_count = count($rules);
$rsRuleCnt += $temp_count - 1;
$i += $temp_count-1;
$ruleset->resetCache();
}
}
}
/**
* Compile the selectors and create a new ruleset object for the compile() method
*
*/
private function PrepareRuleset($env){
$hasOnePassingSelector = false;
$selectors = array();
if( $this->selectors ){
Less_Tree_DefaultFunc::error("it is currently only allowed in parametric mixin guards,");
foreach($this->selectors as $s){
$selector = $s->compile($env);
$selectors[] = $selector;
if( $selector->evaldCondition ){
$hasOnePassingSelector = true;
}
}
Less_Tree_DefaultFunc::reset();
} else {
$hasOnePassingSelector = true;
}
if( $this->rules && $hasOnePassingSelector ){
$rules = $this->rules;
}else{
$rules = array();
}
$ruleset = new Less_Tree_Ruleset($selectors, $rules, $this->strictImports);
$ruleset->originalRuleset = $this->ruleset_id;
$ruleset->root = $this->root;
$ruleset->firstRoot = $this->firstRoot;
$ruleset->allowImports = $this->allowImports;
// push the current ruleset to the frames stack
$env->unshiftFrame($ruleset);
// Evaluate imports
if( $ruleset->root || $ruleset->allowImports || !$ruleset->strictImports ){
$ruleset->evalImports($env);
}
return $ruleset;
}
function evalImports($env) {
$rules_len = count($this->rules);
for($i=0; $i < $rules_len; $i++){
$rule = $this->rules[$i];
if( $rule instanceof Less_Tree_Import ){
$rules = $rule->compile($env);
if( is_array($rules) ){
array_splice($this->rules, $i, 1, $rules);
$temp_count = count($rules)-1;
$i += $temp_count;
$rules_len += $temp_count;
}else{
array_splice($this->rules, $i, 1, array($rules));
}
$this->resetCache();
}
}
}
function makeImportant(){
$important_rules = array();
foreach($this->rules as $rule){
if( $rule instanceof Less_Tree_Rule || $rule instanceof Less_Tree_Ruleset ){
$important_rules[] = $rule->makeImportant();
}else{
$important_rules[] = $rule;
}
}
return new Less_Tree_Ruleset($this->selectors, $important_rules, $this->strictImports );
}
public function matchArgs($args){
return !$args;
}
// lets you call a css selector with a guard
public function matchCondition( $args, $env ){
$lastSelector = end($this->selectors);
if( !$lastSelector->evaldCondition ){
return false;
}
if( $lastSelector->condition && !$lastSelector->condition->compile( $env->copyEvalEnv( $env->frames ) ) ){
return false;
}
return true;
}
function resetCache(){
$this->_rulesets = null;
$this->_variables = null;
$this->lookups = array();
}
public function variables(){
$this->_variables = array();
foreach( $this->rules as $r){
if ($r instanceof Less_Tree_Rule && $r->variable === true) {
$this->_variables[$r->name] = $r;
}
}
}
public function variable($name){
if( is_null($this->_variables) ){
$this->variables();
}
return isset($this->_variables[$name]) ? $this->_variables[$name] : null;
}
public function find( $selector, $self = null ){
$key = implode(' ',$selector->_oelements);
if( !isset($this->lookups[$key]) ){
if( !$self ){
$self = $this->ruleset_id;
}
$this->lookups[$key] = array();
$first_oelement = $selector->_oelements[0];
foreach($this->rules as $rule){
if( $rule instanceof Less_Tree_Ruleset && $rule->ruleset_id != $self ){
if( isset($rule->first_oelements[$first_oelement]) ){
foreach( $rule->selectors as $ruleSelector ){
$match = $selector->match($ruleSelector);
if( $match ){
if( $selector->elements_len > $match ){
$this->lookups[$key] = array_merge($this->lookups[$key], $rule->find( new Less_Tree_Selector(array_slice($selector->elements, $match)), $self));
} else {
$this->lookups[$key][] = $rule;
}
break;
}
}
}
}
}
}
return $this->lookups[$key];
}
/**
* @see Less_Tree::genCSS
*/
public function genCSS( $output ){
if( !$this->root ){
Less_Environment::$tabLevel++;
}
$tabRuleStr = $tabSetStr = '';
if( !Less_Parser::$options['compress'] ){
if( Less_Environment::$tabLevel ){
$tabRuleStr = "\n".str_repeat( ' ' , Less_Environment::$tabLevel );
$tabSetStr = "\n".str_repeat( ' ' , Less_Environment::$tabLevel-1 );
}else{
$tabSetStr = $tabRuleStr = "\n";
}
}
$ruleNodes = array();
$rulesetNodes = array();
foreach($this->rules as $rule){
$class = get_class($rule);
if( ($class === 'Less_Tree_Media') || ($class === 'Less_Tree_Directive') || ($this->root && $class === 'Less_Tree_Comment') || ($class === 'Less_Tree_Ruleset' && $rule->rules) ){
$rulesetNodes[] = $rule;
}else{
$ruleNodes[] = $rule;
}
}
// If this is the root node, we don't render
// a selector, or {}.
if( !$this->root ){
/*
debugInfo = tree.debugInfo(env, this, tabSetStr);
if (debugInfo) {
output.add(debugInfo);
output.add(tabSetStr);
}
*/
$paths_len = count($this->paths);
for( $i = 0; $i < $paths_len; $i++ ){
$path = $this->paths[$i];
$firstSelector = true;
foreach($path as $p){
$p->genCSS( $output, $firstSelector );
$firstSelector = false;
}
if( $i + 1 < $paths_len ){
$output->add( ',' . $tabSetStr );
}
}
$output->add( (Less_Parser::$options['compress'] ? '{' : " {") . $tabRuleStr );
}
// Compile rules and rulesets
$ruleNodes_len = count($ruleNodes);
$rulesetNodes_len = count($rulesetNodes);
for( $i = 0; $i < $ruleNodes_len; $i++ ){
$rule = $ruleNodes[$i];
// @page{ directive ends up with root elements inside it, a mix of rules and rulesets
// In this instance we do not know whether it is the last property
if( $i + 1 === $ruleNodes_len && (!$this->root || $rulesetNodes_len === 0 || $this->firstRoot ) ){
Less_Environment::$lastRule = true;
}
$rule->genCSS( $output );
if( !Less_Environment::$lastRule ){
$output->add( $tabRuleStr );
}else{
Less_Environment::$lastRule = false;
}
}
if( !$this->root ){
$output->add( $tabSetStr . '}' );
Less_Environment::$tabLevel--;
}
$firstRuleset = true;
$space = ($this->root ? $tabRuleStr : $tabSetStr);
for( $i = 0; $i < $rulesetNodes_len; $i++ ){
if( $ruleNodes_len && $firstRuleset ){
$output->add( $space );
}elseif( !$firstRuleset ){
$output->add( $space );
}
$firstRuleset = false;
$rulesetNodes[$i]->genCSS( $output);
}
if( !Less_Parser::$options['compress'] && $this->firstRoot ){
$output->add( "\n" );
}
}
function markReferenced(){
if( !$this->selectors ){
return;
}
foreach($this->selectors as $selector){
$selector->markReferenced();
}
}
public function joinSelectors( $context, $selectors ){
$paths = array();
if( is_array($selectors) ){
foreach($selectors as $selector) {
$this->joinSelector( $paths, $context, $selector);
}
}
return $paths;
}
public function joinSelector( &$paths, $context, $selector){
$hasParentSelector = false;
foreach($selector->elements as $el) {
if( $el->value === '&') {
$hasParentSelector = true;
}
}
if( !$hasParentSelector ){
if( $context ){
foreach($context as $context_el){
$paths[] = array_merge($context_el, array($selector) );
}
}else {
$paths[] = array($selector);
}
return;
}
// The paths are [[Selector]]
// The first list is a list of comma seperated selectors
// The inner list is a list of inheritance seperated selectors
// e.g.
// .a, .b {
// .c {
// }
// }
// == [[.a] [.c]] [[.b] [.c]]
//
// the elements from the current selector so far
$currentElements = array();
// the current list of new selectors to add to the path.
// We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
// by the parents
$newSelectors = array(array());
foreach( $selector->elements as $el){
// non parent reference elements just get added
if( $el->value !== '&' ){
$currentElements[] = $el;
} else {
// the new list of selectors to add
$selectorsMultiplied = array();
// merge the current list of non parent selector elements
// on to the current list of selectors to add
if( $currentElements ){
$this->mergeElementsOnToSelectors( $currentElements, $newSelectors);
}
// loop through our current selectors
foreach($newSelectors as $sel){
// if we don't have any parent paths, the & might be in a mixin so that it can be used
// whether there are parents or not
if( !$context ){
// the combinator used on el should now be applied to the next element instead so that
// it is not lost
if( $sel ){
$sel[0]->elements = array_slice($sel[0]->elements,0);
$sel[0]->elements[] = new Less_Tree_Element($el->combinator, '', $el->index, $el->currentFileInfo );
}
$selectorsMultiplied[] = $sel;
}else {
// and the parent selectors
foreach($context as $parentSel){
// We need to put the current selectors
// then join the last selector's elements on to the parents selectors
// our new selector path
$newSelectorPath = array();
// selectors from the parent after the join
$afterParentJoin = array();
$newJoinedSelectorEmpty = true;
//construct the joined selector - if & is the first thing this will be empty,
// if not newJoinedSelector will be the last set of elements in the selector
if( $sel ){
$newSelectorPath = $sel;
$lastSelector = array_pop($newSelectorPath);
$newJoinedSelector = $selector->createDerived( array_slice($lastSelector->elements,0) );
$newJoinedSelectorEmpty = false;
}
else {
$newJoinedSelector = $selector->createDerived(array());
}
//put together the parent selectors after the join
if ( count($parentSel) > 1) {
$afterParentJoin = array_merge($afterParentJoin, array_slice($parentSel,1) );
}
if ( $parentSel ){
$newJoinedSelectorEmpty = false;
// join the elements so far with the first part of the parent
$newJoinedSelector->elements[] = new Less_Tree_Element( $el->combinator, $parentSel[0]->elements[0]->value, $el->index, $el->currentFileInfo);
$newJoinedSelector->elements = array_merge( $newJoinedSelector->elements, array_slice($parentSel[0]->elements, 1) );
}
if (!$newJoinedSelectorEmpty) {
// now add the joined selector
$newSelectorPath[] = $newJoinedSelector;
}
// and the rest of the parent
$newSelectorPath = array_merge($newSelectorPath, $afterParentJoin);
// add that to our new set of selectors
$selectorsMultiplied[] = $newSelectorPath;
}
}
}
// our new selectors has been multiplied, so reset the state
$newSelectors = $selectorsMultiplied;
$currentElements = array();
}
}
// if we have any elements left over (e.g. .a& .b == .b)
// add them on to all the current selectors
if( $currentElements ){
$this->mergeElementsOnToSelectors($currentElements, $newSelectors);
}
foreach( $newSelectors as $new_sel){
if( $new_sel ){
$paths[] = $new_sel;
}
}
}
function mergeElementsOnToSelectors( $elements, &$selectors){
if( !$selectors ){
$selectors[] = array( new Less_Tree_Selector($elements) );
return;
}
foreach( $selectors as &$sel){
// if the previous thing in sel is a parent this needs to join on to it
if( $sel ){
$last = count($sel)-1;
$sel[$last] = $sel[$last]->createDerived( array_merge($sel[$last]->elements, $elements) );
}else{
$sel[] = new Less_Tree_Selector( $elements );
}
}
}
}
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