Add specificity information

Author: balbuf

selector-grammar.ne

@@ -51,27 +51,40 @@ selectors_group -> _ selector (_ "," _ selector):* _
 	} %}
 
 selector -> simple_selector_sequence (combinator simple_selector_sequence):*
-	{% (d) => { return {type: 'selector', nodes: collectObjects(d)} } %}
+	{% (d) => {
+		var nodes = collectObjects(d)
+		  , specificity = {a: 0, b: 0, c: 0, d: 0}
+		;
+
+		// calculate the specificity @see: https://www.w3.org/TR/2009/CR-CSS2-20090908/cascade.html#specificity
+		for (var i = 0; i < nodes.length; i++) {
+			if (nodes[i].specificityType) {
+				specificity[nodes[i].specificityType]++;
+			}
+		}
+
+		return {type: 'selector', nodes, specificity};
+	} %}
 
 combinator -> ( _ [+>~] _ | __ )
-	{% (d, location) => { return {type: combinatorTypes[d[0][1] || ' '], location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: combinatorTypes[d[0][1] || ' '], location, raw: collapseRaw(d), specificityType: null} } %}
 
 simple_selector_sequence -> ( type_selector | universal ) simple_selector:* | simple_selector:+
 
 simple_selector -> hash | class | attrib | pseudo | negation
 
 # selectors
 universal -> namespace_prefix:? "*"
-	{% (d, location) => { return {type: 'universalSelector', namespace: d[0] ? d[0].name : d[0], location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: 'universalSelector', namespace: d[0] ? d[0].name : d[0], location, raw: collapseRaw(d), specificityType: null} } %}
 type_selector -> namespace_prefix:? ident
-	{% (d, location) => { return {type: 'typeSelector', namespace: d[0] ? d[0].name : d[0], name: collapse(d[1]), location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: 'typeSelector', namespace: d[0] ? d[0].name : d[0], name: collapse(d[1]), location, raw: collapseRaw(d), specificityType: 'd'} } %}
 hash -> "#" name
-	{% (d, location) => { return {type: 'idSelector', name: collapse(d[1]), location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: 'idSelector', name: collapse(d[1]), location, raw: collapseRaw(d), specificityType: 'b'} } %}
 class -> "." ident
-	{% (d, location) => { return {type: 'classSelector', name: collapse(d[1]), location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: 'classSelector', name: collapse(d[1]), location, raw: collapseRaw(d), specificityType: 'c'} } %}
 attrib -> "[" _ namespace_prefix:? ident _ ( [~|^$*]:? "=" _ ( ident | string ) ):? "]"
 	{% (d, location) => {
-		var obj = {namespace: d[2] ? d[2].name : d[2], name: collapse(d[3]), location, raw: collapseRaw(d)};
+		var obj = {namespace: d[2] ? d[2].name : d[2], name: collapse(d[3]), location, raw: collapseRaw(d), specificityType: 'c'};
 		if (d[5] && d[5].length) {
 			obj.type = 'attributeValueSelector';
 			obj.operator = (d[5][0] || '') + '=';
@@ -95,15 +108,17 @@ pseudo -> ":" ":":? ( ident | functional_pseudo )
 				return reject;
 			}
 			obj.type = 'pseudoElementSelector';
+			obj.specificityType = 'd';
 		} else {
 			obj.type = 'pseudoClassSelector';
+			obj.specificityType = 'c';
 			obj.expression = d[2][0].expression || null;
 			obj.expressionRaw = d[2][0].expressionRaw || null;
 		}
 		return obj;
 	} %}
 negation -> ":" [nN] [oO] [tT] "(" _ negation_arg _ ")"
-	{% (d, location) => { return {type: 'negationSelector', selectors: d[6], location, raw: collapseRaw(d)} } %}
+	{% (d, location) => { return {type: 'negationSelector', selectors: d[6], location, raw: collapseRaw(d), specificityType: null} } %}
 
 # selector helpers
 namespace_prefix -> ( ident | "*" ):? "|"