08-27-周三_17-09-29

node_modules/css-select/lib/compile.js

@@ -0,0 +1,192 @@
+/*
+	compiles a selector to an executable function
+*/
+
+module.exports = compile;
+module.exports.compileUnsafe = compileUnsafe;
+module.exports.compileToken = compileToken;
+
+var parse       = require("css-what"),
+    DomUtils    = require("domutils"),
+    isTag       = DomUtils.isTag,
+    Rules       = require("./general.js"),
+    sortRules   = require("./sort.js"),
+    BaseFuncs   = require("boolbase"),
+    trueFunc    = BaseFuncs.trueFunc,
+    falseFunc   = BaseFuncs.falseFunc,
+    procedure   = require("./procedure.json");
+
+function compile(selector, options, context){
+	var next = compileUnsafe(selector, options, context);
+	return wrap(next);
+}
+
+function wrap(next){
+	return function base(elem){
+		return isTag(elem) && next(elem);
+	};
+}
+
+function compileUnsafe(selector, options, context){
+	var token = parse(selector, options);
+	return compileToken(token, options, context);
+}
+
+function includesScopePseudo(t){
+    return t.type === "pseudo" && (
+        t.name === "scope" || (
+            Array.isArray(t.data) &&
+            t.data.some(function(data){
+                return data.some(includesScopePseudo);
+            })
+        )
+    );
+}
+
+var DESCENDANT_TOKEN = {type: "descendant"},
+    SCOPE_TOKEN = {type: "pseudo", name: "scope"},
+    PLACEHOLDER_ELEMENT = {},
+    getParent = DomUtils.getParent;
+
+//CSS 4 Spec (Draft): 3.3.1. Absolutizing a Scope-relative Selector
+//http://www.w3.org/TR/selectors4/#absolutizing
+function absolutize(token, context){
+    //TODO better check if context is document
+    var hasContext = !!context && !!context.length && context.every(function(e){
+        return e === PLACEHOLDER_ELEMENT || !!getParent(e);
+    });
+
+
+    token.forEach(function(t){
+        if(t.length > 0 && isTraversal(t[0]) && t[0].type !== "descendant"){
+            //don't return in else branch
+        } else if(hasContext && !includesScopePseudo(t)){
+            t.unshift(DESCENDANT_TOKEN);
+        } else {
+            return;
+        }
+
+        t.unshift(SCOPE_TOKEN);
+    });
+}
+
+function compileToken(token, options, context){
+    token = token.filter(function(t){ return t.length > 0; });
+
+	token.forEach(sortRules);
+
+	var isArrayContext = Array.isArray(context);
+
+    context = (options && options.context) || context;
+
+    if(context && !isArrayContext) context = [context];
+
+    absolutize(token, context);
+
+	return token
+		.map(function(rules){ return compileRules(rules, options, context, isArrayContext); })
+		.reduce(reduceRules, falseFunc);
+}
+
+function isTraversal(t){
+	return procedure[t.type] < 0;
+}
+
+function compileRules(rules, options, context, isArrayContext){
+	var acceptSelf = (isArrayContext && rules[0].name === "scope" && rules[1].type === "descendant");
+	return rules.reduce(function(func, rule, index){
+		if(func === falseFunc) return func;
+		return Rules[rule.type](func, rule, options, context, acceptSelf && index === 1);
+	}, options && options.rootFunc || trueFunc);
+}
+
+function reduceRules(a, b){
+	if(b === falseFunc || a === trueFunc){
+		return a;
+	}
+	if(a === falseFunc || b === trueFunc){
+		return b;
+	}
+
+	return function combine(elem){
+		return a(elem) || b(elem);
+	};
+}
+
+//:not, :has and :matches have to compile selectors
+//doing this in lib/pseudos.js would lead to circular dependencies,
+//so we add them here
+
+var Pseudos     = require("./pseudos.js"),
+    filters     = Pseudos.filters,
+    existsOne   = DomUtils.existsOne,
+    isTag       = DomUtils.isTag,
+    getChildren = DomUtils.getChildren;
+
+
+function containsTraversal(t){
+	return t.some(isTraversal);
+}
+
+filters.not = function(next, token, options, context){
+	var opts = {
+	    	xmlMode: !!(options && options.xmlMode),
+	    	strict: !!(options && options.strict)
+	    };
+
+	if(opts.strict){
+		if(token.length > 1 || token.some(containsTraversal)){
+			throw new SyntaxError("complex selectors in :not aren't allowed in strict mode");
+		}
+	}
+
+    var func = compileToken(token, opts, context);
+
+	if(func === falseFunc) return next;
+	if(func === trueFunc)  return falseFunc;
+
+	return function(elem){
+		return !func(elem) && next(elem);
+	};
+};
+
+filters.has = function(next, token, options){
+	var opts = {
+		xmlMode: !!(options && options.xmlMode),
+		strict: !!(options && options.strict)
+	};
+
+    //FIXME: Uses an array as a pointer to the current element (side effects)
+    var context = token.some(containsTraversal) ? [PLACEHOLDER_ELEMENT] : null;
+
+	var func = compileToken(token, opts, context);
+
+	if(func === falseFunc) return falseFunc;
+	if(func === trueFunc)  return function(elem){
+			return getChildren(elem).some(isTag) && next(elem);
+		};
+
+	func = wrap(func);
+
+    if(context){
+        return function has(elem){
+		return next(elem) && (
+                (context[0] = elem), existsOne(func, getChildren(elem))
+            );
+	};
+    }
+
+    return function has(elem){
+		return next(elem) && existsOne(func, getChildren(elem));
+	};
+};
+
+filters.matches = function(next, token, options, context){
+	var opts = {
+		xmlMode: !!(options && options.xmlMode),
+		strict: !!(options && options.strict),
+		rootFunc: next
+	};
+
+	return compileToken(token, opts, context);
+};