scss-library/components/00_Global/_bemGenerator.styl

/*
 * This is set of mixins to help generating
 * CSS classes according to the Block__Element--Modifier pattern.
 * It also helps nesting those classes in any fashion imaganible
 * and still produces clean BEM CSS
 */

_css-prefix = 'RV'

// Cache for Blocks
_last_block_name = null

_element_building_lane = {}
_element_block_stack = ()

_block_modifier_building_lane = {}
_block_modifier_block_stack = ()


/*
 * Generates a CSS class for an
 * Block according to BEM
 */
RV-Block(name)
	tow(name, block)


/*
 * Generates a CSS class for an block modifier
 * according to BEM. 
 */
RV-Block__Modifier(name)
	// Determining if we are inside a block or after a block
	call_stack = _call_stack_till_first_block()
	if 'RV-Block' in call_stack
		// We are called inside a block
		push(_block_modifier_block_stack, @block{block})

		//Detect if the selector will be generated
		//by an earlier call of RV-Element
		if not 'RV-Block__Modifier' in call_stack
			block_list = _pop_stack(_block_modifier_block_stack)
			_block_modifier_building_lane[name] = {
				block_list: block_list
			}
	else
		// We are not called inside a block
		// Is there a block to attach to
		if _last_block_name != null
			.{_last_block_name}--{name}
				{block}

/*
 * Generates an CSS class for an element
 * according to BEM. Also minds the element modifiers
 * For more see RV-Element___Modifier
 */
RV-Element(name)
	attach('RV-Block', unquote('__' + name), block)



/*	p(_block_building_lane)
 * Generates a CSS class for an element modifier
 * according to BEM. These are ment to be part of the 
 * content block of an element and since child-mixins
 * are called first there is no way of knowing what the
 * current element is named. To solve this, we store
 * a callback for the modifier and add the element name
 * from RV-Element
 */
RV-Element__Modifier(name)
	counter = 0
	for fn in called-from
		if fn is 'RV-Element'
			counter += 1
					
	if counter <= 1
		element_modifier_block_stack = _global_scope['_element_modifier_block_stack']
		append(element_modifier_block_stack, block)
		_global_scope['_element_modifier_block_stack'] = element_modifier_block_stack
		
		//Is this modifier beeing included by another modifier
		if not 'RV-Element__Modifier' in called-from
			//No
			//Is this modifier beeing called in in- or postfix
			if not 'RV-Element' in called-from
				//Yes
				last_element_name = _global_scope['_last_element_name']
				
				//Accesing the last generated element and appending the modifier
				element = _global_scope['_selector_blocks_to_generate'][last_element_name]
				modifier_list = element['modifier_list']
				modifier_list[name] = _global_scope['_element_modifier_block_stack']
				element['modifier_list'] = modifier_list

				_global_scope['_selector_blocks_to_generate'][last_element_name] = element
			else
				//No
				_global_scope['_element_modifier_stack'][name] = _global_scope['_element_modifier_block_stack']
				
			_global_scope['_element_modifier_block_stack'] = ()
		else
			p('wurstwasser')