<?php

/**
 * Rule
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Rule extends Less_Tree {

	public $name;
	public $value;
	public $important;
	public $merge;
	public $index;
	public $inline;
	public $variable;
	public $currentFileInfo;
	public $type = 'Rule';

	/**
	 * @param string $important
	 */
	public function __construct( $name, $value = null, $important = null, $merge = null, $index = null, $currentFileInfo = null, $inline = false ) {
		$this->name = $name;
		$this->value = ( $value instanceof Less_Tree_Value || $value instanceof Less_Tree_Ruleset ) ? $value : new Less_Tree_Value( array( $value ) );
		$this->important = $important ? ' ' . trim( $important ) : '';
		$this->merge = $merge;
		$this->index = $index;
		$this->currentFileInfo = $currentFileInfo;
		$this->inline = $inline;
		$this->variable = ( is_string( $name ) && $name[0] === '@' );
	}

	public function accept( $visitor ) {
		$this->value = $visitor->visitObj( $this->value );
	}

	/**
	 * @see Less_Tree::genCSS
	 */
	public function genCSS( $output ) {
		$output->add( $this->name . Less_Environment::$_outputMap[': '], $this->currentFileInfo, $this->index );
		try{
			$this->value->genCSS( $output );

		}catch ( Less_Exception_Parser $e ) {
			$e->index = $this->index;
			$e->currentFile = $this->currentFileInfo;
			throw $e;
		}
		$output->add( $this->important . ( ( $this->inline || ( Less_Environment::$lastRule && Less_Parser::$options['compress'] ) ) ? "" : ";" ), $this->currentFileInfo, $this->index );
	}

	public function compile( $env ) {
		$name = $this->name;
		if ( is_array( $name ) ) {
			// expand 'primitive' name directly to get
			// things faster (~10% for benchmark.less):
			if ( count( $name ) === 1 && $name[0] instanceof Less_Tree_Keyword ) {
				$name = $name[0]->value;
			} else {
				$name = $this->CompileName( $env, $name );
			}
		}

		$strictMathBypass = Less_Parser::$options['strictMath'];
		if ( $name === "font" && !Less_Parser::$options['strictMath'] ) {
			Less_Parser::$options['strictMath'] = true;
		}

		try {
			$evaldValue = $this->value->compile( $env );

			if ( !$this->variable && $evaldValue->type === "DetachedRuleset" ) {
				throw new Less_Exception_Compiler( "Rulesets cannot be evaluated on a property.", null, $this->index, $this->currentFileInfo );
			}

			if ( Less_Environment::$mixin_stack ) {
				$return = new Less_Tree_Rule( $name, $evaldValue, $this->important, $this->merge, $this->index, $this->currentFileInfo, $this->inline );
			} else {
				$this->name = $name;
				$this->value = $evaldValue;
				$return = $this;
			}

		}catch ( Less_Exception_Parser $e ) {
			if ( !is_numeric( $e->index ) ) {
				$e->index = $this->index;
				$e->currentFile = $this->currentFileInfo;
			}
			throw $e;
		}

		Less_Parser::$options['strictMath'] = $strictMathBypass;

		return $return;
	}

	public function CompileName( $env, $name ) {
		$output = new Less_Output();
		foreach ( $name as $n ) {
			$n->compile( $env )->genCSS( $output );
		}
		return $output->toString();
	}

	public function makeImportant() {
		return new Less_Tree_Rule( $this->name, $this->value, '!important', $this->merge, $this->index, $this->currentFileInfo, $this->inline );
	}

}
