08-27-周三_17-09-29

node_modules/CSSselect/lib/pseudos.js

@@ -0,0 +1,338 @@
+/*
+	pseudo selectors
+	
+	---
+	
+	they are available in two forms:
+	* filters called when the selector 
+	  is compiled and return a function
+	  that needs to return next()
+	* pseudos get called on execution
+	  they need to return a boolean
+*/
+
+var DomUtils    = require("domutils"),
+    isTag       = DomUtils.isTag,
+    getText     = DomUtils.getText,
+    getParent   = DomUtils.getParent,
+    getChildren = DomUtils.getChildren,
+    getSiblings = DomUtils.getSiblings,
+    hasAttrib   = DomUtils.hasAttrib,
+    getName     = DomUtils.getName,
+    getAttribute= DomUtils.getAttributeValue,
+    getNCheck   = require("./nth-check.js"),
+    checkAttrib = require("./attributes.js").rules.equals,
+    BaseFuncs   = require("./basefunctions.js"),
+    trueFunc    = BaseFuncs.trueFunc,
+    falseFunc   = BaseFuncs.falseFunc;
+
+//helper methods
+function getFirstElement(elems){
+	for(var i = 0; elems && i < elems.length; i++){
+		if(isTag(elems[i])) return elems[i];
+	}
+}
+
+function getAttribFunc(name, value){
+	var data = {name: name, value: value};
+	return function attribFunc(next){
+		return checkAttrib(next, data);
+	};
+}
+
+function getChildFunc(next){
+	return function(elem){
+		return !!getParent(elem) && next(elem);
+	};
+}
+
+var filters = {
+	contains: function(next, text){
+		if(
+			(text.charAt(0) === "\"" || text.charAt(0) === "'") &&
+			text.charAt(0) === text.substr(-1)
+		){
+			text = text.slice(1, -1);
+		}
+		return function contains(elem){
+			return getText(elem).indexOf(text) >= 0 && next(elem);
+		};
+	},
+
+	//location specific methods
+	//first- and last-child methods return as soon as they find another element
+	"first-child": function(next){
+		return function firstChild(elem){
+			return getFirstElement(getSiblings(elem)) === elem && next(elem);
+		};
+	},
+	"last-child": function(next){
+		return function lastChild(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = siblings.length - 1; i >= 0; i--){
+				if(siblings[i] === elem) return next(elem);
+				if(isTag(siblings[i])) break;
+			}
+
+			return false;
+		};
+	},
+	"first-of-type": function(next){
+		return function firstOfType(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = 0; i < siblings.length; i++){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) return next(elem);
+					if(getName(siblings[i]) === getName(elem)) break;
+				}
+			}
+
+			return false;
+		};
+	},
+	"last-of-type": function(next){
+		return function lastOfType(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = siblings.length-1; i >= 0; i--){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) return next(elem);
+					if(getName(siblings[i]) === getName(elem)) break;
+				}
+			}
+
+			return false;
+		};
+	},
+	"only-of-type": function(next){
+		return function onlyOfType(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = 0, j = siblings.length; i < j; i++){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) continue;
+					if(getName(siblings[i]) === getName(elem)) return false;
+				}
+			}
+
+			return next(elem);
+		};
+	},
+	"only-child": function(next){
+		return function onlyChild(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = 0; i < siblings.length; i++){
+				if(isTag(siblings[i]) && siblings[i] !== elem) return false;
+			}
+
+			return next(elem);
+		};
+	},
+	"nth-child": function(next, rule){
+		var func = getNCheck(rule);
+
+		if(func === falseFunc) return func;
+		if(func === trueFunc)  return getChildFunc(next);
+
+		return function nthChild(elem){
+			var siblings = getSiblings(elem);
+
+			for(var i = 0, pos = 0; i < siblings.length; i++){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) break;
+					else pos++;
+				}
+			}
+
+			return func(pos) && next(elem);
+		};
+	},
+	"nth-last-child": function(next, rule){
+		var func = getNCheck(rule);
+
+		if(func === falseFunc) return func;
+		if(func === trueFunc)  return getChildFunc(next);
+
+		return function nthLastChild(elem){
+			var siblings = getSiblings(elem);
+
+			for(var pos = 0, i = siblings.length - 1; i >= 0; i--){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) break;
+					else pos++;
+				}
+			}
+
+			return func(pos) && next(elem);
+		};
+	},
+	"nth-of-type": function(next, rule){
+		var func = getNCheck(rule);
+
+		if(func === falseFunc) return func;
+		if(func === trueFunc)  return getChildFunc(next);
+
+		return function nthOfType(elem){
+			var siblings = getSiblings(elem);
+
+			for(var pos = 0, i = 0; i < siblings.length; i++){
+				if(isTag(siblings[i])){
+					if(siblings[i] === elem) break;
+					if(getName(siblings[i]) === getName(elem)) pos++;
+				}
+			}
+
+			return func(pos) && next(elem);
+		};
+	},
+	"nth-last-of-type": function(next, rule){
+		var func = getNCheck(rule);
+
+		if(func === falseFunc) return func;
+		if(func === trueFunc)  return getChildFunc(next);
+
+		return function nthLastOfType(elem){
+			var siblings = getSiblings(elem);
+
+			for(var pos = 0, i = siblings.length - 1; i >= 0; i--){
+				if(siblings[i] === elem) break;
+				if(getName(siblings[i]) === getName(elem)) pos++;
+			}
+
+			return func(pos) && next(elem);
+		};
+	},
+
+	//jQuery extensions (others follow as pseudos)
+	checkbox: getAttribFunc("type", "checkbox"),
+	file: getAttribFunc("type", "file"),
+	password: getAttribFunc("type", "password"),
+	radio: getAttribFunc("type", "radio"),
+	reset: getAttribFunc("type", "reset"),
+	image: getAttribFunc("type", "image"),
+	submit: getAttribFunc("type", "submit")
+};
+
+//while filters are precompiled, pseudos get called when they are needed
+var pseudos = {
+	root: function(elem){
+		return !getParent(elem);
+	},
+	empty: function(elem){
+		return !getChildren(elem).some(function(elem){
+			return isTag(elem) || elem.type === "text";
+		});
+	},
+
+	//forms
+	//to consider: :target, :enabled
+	selected: function(elem){
+		if(hasAttrib(elem, "selected")) return true;
+		else if(getName(elem) !== "option") return false;
+
+		//the first <option> in a <select> is also selected
+		var parent = getParent(elem);
+
+		if(!parent || getName(parent) !== "select") return false;
+
+		var siblings = getChildren(parent),
+			sawElem  = false;
+
+		for(var i = 0; i < siblings.length; i++){
+			if(isTag(siblings[i])){
+				if(siblings[i] === elem){
+					sawElem = true;
+				} else if(!sawElem){
+					return false;
+				} else if(hasAttrib(siblings[i], "selected")){
+					return false;
+				}
+			}
+		}
+
+		return sawElem;
+	},
+	disabled: function(elem){
+		return hasAttrib(elem, "disabled");
+	},
+	enabled: function(elem){
+		return !hasAttrib(elem, "disabled");
+	},
+	checked: function(elem){
+		return hasAttrib(elem, "checked") || pseudos.selected(elem);
+	},
+
+	//jQuery extensions
+
+	//:parent is the inverse of :empty
+	parent: function(elem){
+		return !pseudos.empty(elem);
+	},
+	header: function(elem){
+		var name = getName(elem);
+		return name === "h1" ||
+		       name === "h2" ||
+		       name === "h3" ||
+		       name === "h4" ||
+		       name === "h5" ||
+		       name === "h6";
+	},
+
+	button: function(elem){
+		var name = getName(elem);
+		return name === "button" ||
+		       name === "input" &&
+		       getAttribute(elem, "type") === "button";
+	},
+	input: function(elem){
+		var name = getName(elem);
+		return name === "input" ||
+		       name === "textarea" ||
+		       name === "select" ||
+		       name === "button";
+	},
+	text: function(elem){
+		var attr;
+		return getName(elem) === "input" && (
+			!(attr = getAttribute(elem, "type")) ||
+			attr.toLowerCase() === "text"
+		);
+	}
+};
+
+function verifyArgs(func, name, subselect){
+	if(subselect === null){
+		if(func.length > 1){
+			throw new SyntaxError("pseudo-selector :" + name + " requires an argument");
+		}
+	} else {
+		if(func.length === 1){
+			throw new SyntaxError("pseudo-selector :" + name + " doesn't have any arguments");
+		}	
+	}
+}
+
+module.exports = {
+	compile: function(next, data){
+		var name = data.name,
+			subselect = data.data;
+
+		if(typeof filters[name] === "function"){
+			verifyArgs(filters[name], name,  subselect);
+			return filters[name](next, subselect);
+		} else if(typeof pseudos[name] === "function"){
+			var func = pseudos[name];
+			verifyArgs(func, name, subselect);
+			return function pseudoArgs(elem){
+				return func(elem, subselect) && next(elem);
+			};
+		} else {
+			throw new SyntaxError("unmatched pseudo-class :" + name);
+		}
+	},
+	filters: filters,
+	pseudos: pseudos
+};