08-27-周三_17-09-29
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393
node_modules/css-select/lib/pseudos.js
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393
node_modules/css-select/lib/pseudos.js
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/*
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pseudo selectors
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---
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they are available in two forms:
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* filters called when the selector
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is compiled and return a function
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that needs to return next()
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* pseudos get called on execution
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they need to return a boolean
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*/
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var DomUtils = require("domutils"),
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isTag = DomUtils.isTag,
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getText = DomUtils.getText,
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getParent = DomUtils.getParent,
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getChildren = DomUtils.getChildren,
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getSiblings = DomUtils.getSiblings,
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hasAttrib = DomUtils.hasAttrib,
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getName = DomUtils.getName,
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getAttribute= DomUtils.getAttributeValue,
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getNCheck = require("nth-check"),
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checkAttrib = require("./attributes.js").rules.equals,
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BaseFuncs = require("boolbase"),
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trueFunc = BaseFuncs.trueFunc,
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falseFunc = BaseFuncs.falseFunc;
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//helper methods
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function getFirstElement(elems){
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for(var i = 0; elems && i < elems.length; i++){
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if(isTag(elems[i])) return elems[i];
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}
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}
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function getAttribFunc(name, value){
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var data = {name: name, value: value};
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return function attribFunc(next){
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return checkAttrib(next, data);
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};
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}
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function getChildFunc(next){
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return function(elem){
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return !!getParent(elem) && next(elem);
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};
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}
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var filters = {
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contains: function(next, text){
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return function contains(elem){
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return next(elem) && getText(elem).indexOf(text) >= 0;
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};
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},
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icontains: function(next, text){
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var itext = text.toLowerCase();
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return function icontains(elem){
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return next(elem) &&
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getText(elem).toLowerCase().indexOf(itext) >= 0;
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};
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},
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//location specific methods
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"nth-child": function(next, rule){
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var func = getNCheck(rule);
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if(func === falseFunc) return func;
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if(func === trueFunc) return getChildFunc(next);
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return function nthChild(elem){
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var siblings = getSiblings(elem);
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for(var i = 0, pos = 0; i < siblings.length; i++){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) break;
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else pos++;
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}
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}
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return func(pos) && next(elem);
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};
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},
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"nth-last-child": function(next, rule){
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var func = getNCheck(rule);
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if(func === falseFunc) return func;
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if(func === trueFunc) return getChildFunc(next);
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return function nthLastChild(elem){
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var siblings = getSiblings(elem);
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for(var pos = 0, i = siblings.length - 1; i >= 0; i--){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) break;
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else pos++;
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}
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}
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return func(pos) && next(elem);
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};
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},
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"nth-of-type": function(next, rule){
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var func = getNCheck(rule);
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if(func === falseFunc) return func;
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if(func === trueFunc) return getChildFunc(next);
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return function nthOfType(elem){
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var siblings = getSiblings(elem);
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for(var pos = 0, i = 0; i < siblings.length; i++){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) break;
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if(getName(siblings[i]) === getName(elem)) pos++;
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}
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}
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return func(pos) && next(elem);
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};
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},
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"nth-last-of-type": function(next, rule){
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var func = getNCheck(rule);
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if(func === falseFunc) return func;
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if(func === trueFunc) return getChildFunc(next);
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return function nthLastOfType(elem){
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var siblings = getSiblings(elem);
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for(var pos = 0, i = siblings.length - 1; i >= 0; i--){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) break;
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if(getName(siblings[i]) === getName(elem)) pos++;
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}
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}
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return func(pos) && next(elem);
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};
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},
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//TODO determine the actual root element
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root: function(next){
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return function(elem){
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return !getParent(elem) && next(elem);
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};
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},
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scope: function(next, rule, options, context){
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if(!context || context.length === 0){
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//equivalent to :root
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return filters.root(next);
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}
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if(context.length === 1){
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//NOTE: can't be unpacked, as :has uses this for side-effects
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return function(elem){
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return context[0] === elem && next(elem);
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};
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}
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return function(elem){
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return context.indexOf(elem) >= 0 && next(elem);
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};
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},
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//jQuery extensions (others follow as pseudos)
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checkbox: getAttribFunc("type", "checkbox"),
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file: getAttribFunc("type", "file"),
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password: getAttribFunc("type", "password"),
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radio: getAttribFunc("type", "radio"),
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reset: getAttribFunc("type", "reset"),
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image: getAttribFunc("type", "image"),
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submit: getAttribFunc("type", "submit")
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};
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//while filters are precompiled, pseudos get called when they are needed
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var pseudos = {
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empty: function(elem){
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return !getChildren(elem).some(function(elem){
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return isTag(elem) || elem.type === "text";
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});
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},
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"first-child": function(elem){
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return getFirstElement(getSiblings(elem)) === elem;
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},
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"last-child": function(elem){
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var siblings = getSiblings(elem);
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for(var i = siblings.length - 1; i >= 0; i--){
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if(siblings[i] === elem) return true;
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if(isTag(siblings[i])) break;
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}
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return false;
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},
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"first-of-type": function(elem){
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var siblings = getSiblings(elem);
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for(var i = 0; i < siblings.length; i++){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) return true;
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if(getName(siblings[i]) === getName(elem)) break;
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}
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}
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return false;
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},
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"last-of-type": function(elem){
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var siblings = getSiblings(elem);
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for(var i = siblings.length-1; i >= 0; i--){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) return true;
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if(getName(siblings[i]) === getName(elem)) break;
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}
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}
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return false;
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},
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"only-of-type": function(elem){
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var siblings = getSiblings(elem);
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for(var i = 0, j = siblings.length; i < j; i++){
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if(isTag(siblings[i])){
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if(siblings[i] === elem) continue;
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if(getName(siblings[i]) === getName(elem)) return false;
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}
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}
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return true;
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},
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"only-child": function(elem){
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var siblings = getSiblings(elem);
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for(var i = 0; i < siblings.length; i++){
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if(isTag(siblings[i]) && siblings[i] !== elem) return false;
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}
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return true;
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},
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//:matches(a, area, link)[href]
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link: function(elem){
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return hasAttrib(elem, "href");
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},
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visited: falseFunc, //seems to be a valid implementation
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//TODO: :any-link once the name is finalized (as an alias of :link)
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//forms
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//to consider: :target
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//:matches([selected], select:not([multiple]):not(> option[selected]) > option:first-of-type)
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selected: function(elem){
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if(hasAttrib(elem, "selected")) return true;
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else if(getName(elem) !== "option") return false;
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//the first <option> in a <select> is also selected
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var parent = getParent(elem);
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if(
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!parent ||
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getName(parent) !== "select" ||
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hasAttrib(parent, "multiple")
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) return false;
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var siblings = getChildren(parent),
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sawElem = false;
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for(var i = 0; i < siblings.length; i++){
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if(isTag(siblings[i])){
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if(siblings[i] === elem){
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sawElem = true;
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} else if(!sawElem){
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return false;
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} else if(hasAttrib(siblings[i], "selected")){
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return false;
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}
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}
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}
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return sawElem;
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},
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//https://html.spec.whatwg.org/multipage/scripting.html#disabled-elements
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//:matches(
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// :matches(button, input, select, textarea, menuitem, optgroup, option)[disabled],
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// optgroup[disabled] > option),
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// fieldset[disabled] * //TODO not child of first <legend>
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//)
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disabled: function(elem){
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return hasAttrib(elem, "disabled");
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},
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enabled: function(elem){
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return !hasAttrib(elem, "disabled");
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},
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//:matches(:matches(:radio, :checkbox)[checked], :selected) (TODO menuitem)
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checked: function(elem){
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return hasAttrib(elem, "checked") || pseudos.selected(elem);
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},
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//:matches(input, select, textarea)[required]
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required: function(elem){
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return hasAttrib(elem, "required");
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},
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//:matches(input, select, textarea):not([required])
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optional: function(elem){
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return !hasAttrib(elem, "required");
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},
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//jQuery extensions
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//:not(:empty)
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parent: function(elem){
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return !pseudos.empty(elem);
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},
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//:matches(h1, h2, h3, h4, h5, h6)
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header: function(elem){
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var name = getName(elem);
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return name === "h1" ||
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name === "h2" ||
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name === "h3" ||
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name === "h4" ||
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name === "h5" ||
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name === "h6";
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},
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//:matches(button, input[type=button])
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button: function(elem){
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var name = getName(elem);
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return name === "button" ||
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name === "input" &&
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getAttribute(elem, "type") === "button";
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},
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//:matches(input, textarea, select, button)
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input: function(elem){
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var name = getName(elem);
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return name === "input" ||
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name === "textarea" ||
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name === "select" ||
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name === "button";
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},
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//input:matches(:not([type!='']), [type='text' i])
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text: function(elem){
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var attr;
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return getName(elem) === "input" && (
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!(attr = getAttribute(elem, "type")) ||
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attr.toLowerCase() === "text"
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);
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}
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};
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function verifyArgs(func, name, subselect){
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if(subselect === null){
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if(func.length > 1 && name !== "scope"){
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throw new SyntaxError("pseudo-selector :" + name + " requires an argument");
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}
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} else {
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if(func.length === 1){
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throw new SyntaxError("pseudo-selector :" + name + " doesn't have any arguments");
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}
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}
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}
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//FIXME this feels hacky
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var re_CSS3 = /^(?:(?:nth|last|first|only)-(?:child|of-type)|root|empty|(?:en|dis)abled|checked|not)$/;
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module.exports = {
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compile: function(next, data, options, context){
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var name = data.name,
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subselect = data.data;
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if(options && options.strict && !re_CSS3.test(name)){
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throw SyntaxError(":" + name + " isn't part of CSS3");
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}
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if(typeof filters[name] === "function"){
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verifyArgs(filters[name], name, subselect);
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return filters[name](next, subselect, options, context);
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} else if(typeof pseudos[name] === "function"){
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var func = pseudos[name];
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verifyArgs(func, name, subselect);
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if(next === trueFunc) return func;
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return function pseudoArgs(elem){
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return func(elem, subselect) && next(elem);
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};
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} else {
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throw new SyntaxError("unmatched pseudo-class :" + name);
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}
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},
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filters: filters,
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pseudos: pseudos
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};
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