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+/*
+ 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"),
+ checkAttrib = require("./attributes.js").rules.equals,
+ BaseFuncs = require("boolbase"),
+ 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){
+ return function contains(elem){
+ return next(elem) && getText(elem).indexOf(text) >= 0;
+ };
+ },
+ icontains: function(next, text){
+ var itext = text.toLowerCase();
+ return function icontains(elem){
+ return next(elem) &&
+ getText(elem).toLowerCase().indexOf(itext) >= 0;
+ };
+ },
+
+ //location specific methods
+ "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(isTag(siblings[i])){
+ if(siblings[i] === elem) break;
+ if(getName(siblings[i]) === getName(elem)) pos++;
+ }
+ }
+
+ return func(pos) && next(elem);
+ };
+ },
+
+ //TODO determine the actual root element
+ root: function(next){
+ return function(elem){
+ return !getParent(elem) && next(elem);
+ };
+ },
+
+ scope: function(next, rule, options, context){
+ if(!context || context.length === 0){
+ //equivalent to :root
+ return filters.root(next);
+ }
+
+ if(context.length === 1){
+ //NOTE: can't be unpacked, as :has uses this for side-effects
+ return function(elem){
+ return context[0] === elem && next(elem);
+ };
+ }
+
+ return function(elem){
+ return context.indexOf(elem) >= 0 && 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 = {
+ empty: function(elem){
+ return !getChildren(elem).some(function(elem){
+ return isTag(elem) || elem.type === "text";
+ });
+ },
+
+ "first-child": function(elem){
+ return getFirstElement(getSiblings(elem)) === elem;
+ },
+ "last-child": function(elem){
+ var siblings = getSiblings(elem);
+
+ for(var i = siblings.length - 1; i >= 0; i--){
+ if(siblings[i] === elem) return true;
+ if(isTag(siblings[i])) break;
+ }
+
+ return false;
+ },
+ "first-of-type": function(elem){
+ var siblings = getSiblings(elem);
+
+ for(var i = 0; i < siblings.length; i++){
+ if(isTag(siblings[i])){
+ if(siblings[i] === elem) return true;
+ if(getName(siblings[i]) === getName(elem)) break;
+ }
+ }
+
+ return false;
+ },
+ "last-of-type": function(elem){
+ var siblings = getSiblings(elem);
+
+ for(var i = siblings.length-1; i >= 0; i--){
+ if(isTag(siblings[i])){
+ if(siblings[i] === elem) return true;
+ if(getName(siblings[i]) === getName(elem)) break;
+ }
+ }
+
+ return false;
+ },
+ "only-of-type": function(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 true;
+ },
+ "only-child": function(elem){
+ var siblings = getSiblings(elem);
+
+ for(var i = 0; i < siblings.length; i++){
+ if(isTag(siblings[i]) && siblings[i] !== elem) return false;
+ }
+
+ return true;
+ },
+
+ //:matches(a, area, link)[href]
+ link: function(elem){
+ return hasAttrib(elem, "href");
+ },
+ visited: falseFunc, //seems to be a valid implementation
+ //TODO: :any-link once the name is finalized (as an alias of :link)
+
+ //forms
+ //to consider: :target
+
+ //:matches([selected], select:not([multiple]):not(> option[selected]) > option:first-of-type)
+ 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" ||
+ hasAttrib(parent, "multiple")
+ ) 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;
+ },
+ //https://html.spec.whatwg.org/multipage/scripting.html#disabled-elements
+ //:matches(
+ // :matches(button, input, select, textarea, menuitem, optgroup, option)[disabled],
+ // optgroup[disabled] > option),
+ // fieldset[disabled] * //TODO not child of first <legend>
+ //)
+ disabled: function(elem){
+ return hasAttrib(elem, "disabled");
+ },
+ enabled: function(elem){
+ return !hasAttrib(elem, "disabled");
+ },
+ //:matches(:matches(:radio, :checkbox)[checked], :selected) (TODO menuitem)
+ checked: function(elem){
+ return hasAttrib(elem, "checked") || pseudos.selected(elem);
+ },
+ //:matches(input, select, textarea)[required]
+ required: function(elem){
+ return hasAttrib(elem, "required");
+ },
+ //:matches(input, select, textarea):not([required])
+ optional: function(elem){
+ return !hasAttrib(elem, "required");
+ },
+
+ //jQuery extensions
+
+ //:not(:empty)
+ parent: function(elem){
+ return !pseudos.empty(elem);
+ },
+ //:matches(h1, h2, h3, h4, h5, h6)
+ header: function(elem){
+ var name = getName(elem);
+ return name === "h1" ||
+ name === "h2" ||
+ name === "h3" ||
+ name === "h4" ||
+ name === "h5" ||
+ name === "h6";
+ },
+
+ //:matches(button, input[type=button])
+ button: function(elem){
+ var name = getName(elem);
+ return name === "button" ||
+ name === "input" &&
+ getAttribute(elem, "type") === "button";
+ },
+ //:matches(input, textarea, select, button)
+ input: function(elem){
+ var name = getName(elem);
+ return name === "input" ||
+ name === "textarea" ||
+ name === "select" ||
+ name === "button";
+ },
+ //input:matches(:not([type!='']), [type='text' i])
+ 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 && name !== "scope"){
+ 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");
+ }
+ }
+}
+
+//FIXME this feels hacky
+var re_CSS3 = /^(?:(?:nth|last|first|only)-(?:child|of-type)|root|empty|(?:en|dis)abled|checked|not)$/;
+
+module.exports = {
+ compile: function(next, data, options, context){
+ var name = data.name,
+ subselect = data.data;
+
+ if(options && options.strict && !re_CSS3.test(name)){
+ throw SyntaxError(":" + name + " isn't part of CSS3");
+ }
+
+ if(typeof filters[name] === "function"){
+ verifyArgs(filters[name], name, subselect);
+ return filters[name](next, subselect, options, context);
+ } else if(typeof pseudos[name] === "function"){
+ var func = pseudos[name];
+ verifyArgs(func, name, subselect);
+
+ if(next === trueFunc) return func;
+
+ return function pseudoArgs(elem){
+ return func(elem, subselect) && next(elem);
+ };
+ } else {
+ throw new SyntaxError("unmatched pseudo-class :" + name);
+ }
+ },
+ filters: filters,
+ pseudos: pseudos
+};