/*
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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 getNCheck = require("nth-check");
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var BaseFuncs = require("boolbase");
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var attributes = require("./attributes.js");
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var trueFunc = BaseFuncs.trueFunc;
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var falseFunc = BaseFuncs.falseFunc;
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var checkAttrib = attributes.rules.equals;
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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, rule, options) {
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return checkAttrib(next, data, options);
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};
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}
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function getChildFunc(next, adapter) {
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return function(elem) {
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return !!adapter.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, options) {
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var adapter = options.adapter;
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return function contains(elem) {
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return next(elem) && adapter.getText(elem).indexOf(text) >= 0;
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};
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},
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icontains: function(next, text, options) {
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var itext = text.toLowerCase();
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var adapter = options.adapter;
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return function icontains(elem) {
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return (
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next(elem) &&
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adapter
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.getText(elem)
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.toLowerCase()
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.indexOf(itext) >= 0
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);
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};
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},
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//location specific methods
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"nth-child": function(next, rule, options) {
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var func = getNCheck(rule);
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var adapter = options.adapter;
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if (func === falseFunc) return func;
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if (func === trueFunc) return getChildFunc(next, adapter);
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return function nthChild(elem) {
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var siblings = adapter.getSiblings(elem);
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for (var i = 0, pos = 0; i < siblings.length; i++) {
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if (adapter.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, options) {
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var func = getNCheck(rule);
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var adapter = options.adapter;
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if (func === falseFunc) return func;
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if (func === trueFunc) return getChildFunc(next, adapter);
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return function nthLastChild(elem) {
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var siblings = adapter.getSiblings(elem);
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for (var pos = 0, i = siblings.length - 1; i >= 0; i--) {
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if (adapter.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, options) {
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var func = getNCheck(rule);
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var adapter = options.adapter;
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if (func === falseFunc) return func;
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if (func === trueFunc) return getChildFunc(next, adapter);
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return function nthOfType(elem) {
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var siblings = adapter.getSiblings(elem);
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for (var pos = 0, i = 0; i < siblings.length; i++) {
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if (adapter.isTag(siblings[i])) {
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if (siblings[i] === elem) break;
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if (adapter.getName(siblings[i]) === adapter.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, options) {
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var func = getNCheck(rule);
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var adapter = options.adapter;
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if (func === falseFunc) return func;
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if (func === trueFunc) return getChildFunc(next, adapter);
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return function nthLastOfType(elem) {
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var siblings = adapter.getSiblings(elem);
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for (var pos = 0, i = siblings.length - 1; i >= 0; i--) {
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if (adapter.isTag(siblings[i])) {
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if (siblings[i] === elem) break;
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if (adapter.getName(siblings[i]) === adapter.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, rule, options) {
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var adapter = options.adapter;
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return function(elem) {
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return !adapter.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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var adapter = options.adapter;
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if (!context || context.length === 0) {
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//equivalent to :root
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return filters.root(next, rule, options);
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}
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function equals(a, b) {
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if (typeof adapter.equals === "function") return adapter.equals(a, b);
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return a === b;
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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 equals(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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//dynamic state pseudos. These depend on optional Adapter methods.
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hover: function(next, rule, options) {
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var adapter = options.adapter;
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if (typeof adapter.isHovered === 'function') {
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return function hover(elem) {
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return next(elem) && adapter.isHovered(elem);
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};
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}
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return falseFunc;
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},
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visited: function(next, rule, options) {
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var adapter = options.adapter;
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if (typeof adapter.isVisited === 'function') {
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return function visited(elem) {
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return next(elem) && adapter.isVisited(elem);
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};
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}
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return falseFunc;
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},
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active: function(next, rule, options) {
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var adapter = options.adapter;
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if (typeof adapter.isActive === 'function') {
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return function active(elem) {
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return next(elem) && adapter.isActive(elem);
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};
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}
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return falseFunc;
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}
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};
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//helper methods
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function getFirstElement(elems, adapter) {
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for (var i = 0; elems && i < elems.length; i++) {
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if (adapter.isTag(elems[i])) return elems[i];
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}
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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, adapter) {
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return !adapter.getChildren(elem).some(function(elem) {
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return adapter.isTag(elem) || elem.type === "text";
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});
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},
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"first-child": function(elem, adapter) {
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return getFirstElement(adapter.getSiblings(elem), adapter) === elem;
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},
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"last-child": function(elem, adapter) {
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var siblings = adapter.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 (adapter.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, adapter) {
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var siblings = adapter.getSiblings(elem);
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for (var i = 0; i < siblings.length; i++) {
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if (adapter.isTag(siblings[i])) {
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if (siblings[i] === elem) return true;
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if (adapter.getName(siblings[i]) === adapter.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, adapter) {
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var siblings = adapter.getSiblings(elem);
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for (var i = siblings.length - 1; i >= 0; i--) {
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if (adapter.isTag(siblings[i])) {
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if (siblings[i] === elem) return true;
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if (adapter.getName(siblings[i]) === adapter.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, adapter) {
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var siblings = adapter.getSiblings(elem);
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for (var i = 0, j = siblings.length; i < j; i++) {
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if (adapter.isTag(siblings[i])) {
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if (siblings[i] === elem) continue;
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if (adapter.getName(siblings[i]) === adapter.getName(elem)) {
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return false;
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}
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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, adapter) {
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var siblings = adapter.getSiblings(elem);
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for (var i = 0; i < siblings.length; i++) {
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if (adapter.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, adapter) {
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return adapter.hasAttrib(elem, "href");
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},
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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, adapter) {
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if (adapter.hasAttrib(elem, "selected")) return true;
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else if (adapter.getName(elem) !== "option") return false;
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//the first <option> in a <select> is also selected
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var parent = adapter.getParent(elem);
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if (!parent || adapter.getName(parent) !== "select" || adapter.hasAttrib(parent, "multiple")) {
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return false;
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}
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var siblings = adapter.getChildren(parent);
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var sawElem = false;
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for (var i = 0; i < siblings.length; i++) {
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if (adapter.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 (adapter.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, adapter) {
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return adapter.hasAttrib(elem, "disabled");
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},
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enabled: function(elem, adapter) {
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return !adapter.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, adapter) {
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return adapter.hasAttrib(elem, "checked") || pseudos.selected(elem, adapter);
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},
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//:matches(input, select, textarea)[required]
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required: function(elem, adapter) {
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return adapter.hasAttrib(elem, "required");
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},
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//:matches(input, select, textarea):not([required])
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optional: function(elem, adapter) {
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return !adapter.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, adapter) {
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return !pseudos.empty(elem, adapter);
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},
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//:matches(h1, h2, h3, h4, h5, h6)
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header: namePseudo(["h1", "h2", "h3", "h4", "h5", "h6"]),
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//:matches(button, input[type=button])
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button: function(elem, adapter) {
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var name = adapter.getName(elem);
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return (
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name === "button" || (name === "input" && adapter.getAttributeValue(elem, "type") === "button")
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);
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},
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//:matches(input, textarea, select, button)
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input: namePseudo(["input", "textarea", "select", "button"]),
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//input:matches(:not([type!='']), [type='text' i])
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text: function(elem, adapter) {
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var attr;
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return (
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adapter.getName(elem) === "input" &&
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(!(attr = adapter.getAttributeValue(elem, "type")) || attr.toLowerCase() === "text")
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);
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}
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};
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function namePseudo(names) {
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if (typeof Set !== "undefined") {
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// eslint-disable-next-line no-undef
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var nameSet = new Set(names);
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return function(elem, adapter) {
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return nameSet.has(adapter.getName(elem));
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};
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}
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return function(elem, adapter) {
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return names.indexOf(adapter.getName(elem)) >= 0;
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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 > 2 && name !== "scope") {
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throw new Error("pseudo-selector :" + name + " requires an argument");
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}
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} else {
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if (func.length === 2) {
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throw new Error("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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var subselect = data.data;
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var adapter = options.adapter;
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if (options && options.strict && !re_CSS3.test(name)) {
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throw new Error(":" + name + " isn't part of CSS3");
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}
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if (typeof filters[name] === "function") {
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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 (func === falseFunc) {
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return func;
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}
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if (next === trueFunc) {
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return function pseudoRoot(elem) {
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return func(elem, adapter, subselect);
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};
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}
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return function pseudoArgs(elem) {
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return func(elem, adapter, subselect) && next(elem);
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};
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} else {
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throw new Error("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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