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Merge pull request #672 from openkraken/feat/support_querySelector
Feat/support querySelector and querySelectorAll
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| function fetchSelector(str: string, regex: RegExp) { | ||
| return { | ||
| selectors: str.match(regex) || [], | ||
| ruleStr: str.replace(regex, ' ') | ||
| }; | ||
| } | ||
|
|
||
| function getElementsBySelector(selector: string): Array<Element | null | HTMLElement> { | ||
| let context = document; | ||
| let temp, tempElements: Array<Element> = [], elements: Array<Element> = []; | ||
| selector = selector.trim(); | ||
|
|
||
| // If selector starts with *, find all elements. | ||
| if (selector.charAt(0) === '*') { | ||
| let temps: HTMLCollectionOf<Element> = context.getElementsByTagName('*'); | ||
| tempElements = Array.from(temps); | ||
| } | ||
|
|
||
| // Classes. e.g. .row. | ||
| let classes: Array<string> = []; | ||
| selector = selector.split(' ').map(item => { | ||
| if (item && item.charAt(0) === '.') { | ||
| temp = fetchSelector(selector, /\.[\w-_]+/g); | ||
| classes = classes.concat(temp.selectors) | ||
| return temp.ruleStr; | ||
| } | ||
| return item; | ||
| }).join(' '); | ||
|
|
||
| // Ids. e.g. #mail-title. | ||
| temp = fetchSelector(selector, /#[\w-_]+/g); | ||
| let id = temp.selectors ? temp.selectors[0] : null; | ||
| selector = temp.ruleStr; | ||
|
|
||
| // Attributes. e.g. [rel=external]. | ||
| temp = fetchSelector(selector, /\[.+?\]/g); | ||
| let attributes = temp.selectors; | ||
| selector = temp.ruleStr; | ||
|
|
||
| // Elements. e.g. header, div. | ||
| temp = fetchSelector(selector, /\w+/g); | ||
| let els = temp.selectors; | ||
| selector = temp.ruleStr; | ||
|
|
||
| // Get by id. | ||
| // Id is supposed to be unique. | ||
| // More need to attach other selectors. | ||
| if (id) { | ||
| id = id.substring(1); | ||
| return [document.getElementById(id) || null]; | ||
| } | ||
|
|
||
| // Get by Elements. | ||
| if (els.length !== 0) { | ||
| let temps: HTMLCollectionOf<Element> = context.getElementsByTagName(els[0]); | ||
| tempElements = tempElements.concat(Array.from(temps)); | ||
| } | ||
|
|
||
| // Get by class name. | ||
| for (let i = 0, l = classes.length; i !== l; ++i) { | ||
| let className = classes[i].substring(1); | ||
| let temps: HTMLCollectionOf<Element> = context.getElementsByClassName(className); | ||
| let arrTemps: Array<Element> = Array.from(temps); | ||
| if (tempElements.length === 0) { | ||
| // If no temp elements yet, push into tempElements directly. | ||
| tempElements = tempElements.concat(arrTemps); | ||
| } | ||
| else { | ||
| // Otherwise, find intersection. | ||
| let prevs: Array<Element> = []; | ||
| prevs = prevs.concat(tempElements); | ||
| tempElements = []; | ||
|
|
||
| for (let index = 0; index < arrTemps.length; index++) { | ||
| let t = arrTemps[index]; | ||
| if (prevs.indexOf(t) !== -1) { | ||
| tempElements = tempElements.concat([t]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Get by attributes. | ||
| if (attributes.length !== 0) { | ||
| let attrs = {}; | ||
| for (let i = 0; i < attributes.length; i++) { | ||
| let attribute = attributes[i]; | ||
| attribute = attribute.substring(1, attribute.length - 1); | ||
| let parts: Array<string> = (attribute.split('=')).map(item => item.trim()); | ||
| if (parts[1]) { | ||
| parts[1] = parts[1].substring(1, parts[1].length - 1); | ||
| } | ||
| attrs[parts[0]] = parts[1]; | ||
| } | ||
| let prevs: Array<Element> = []; | ||
| prevs = prevs.concat(tempElements); | ||
| tempElements = []; | ||
|
|
||
| for (let i = 0, l = prevs.length; i !== l; ++i) { | ||
| let t = prevs[i]; | ||
| let shouldAdd = true; | ||
| for (let key in attrs) { | ||
| let lastChar = key.charAt(key.length - 1); | ||
| if (/[\^\*\$]$/.test(key)) { | ||
| key = key.substring(0, key.length - 1); | ||
| } | ||
| let tempAttr = t.getAttribute(key) || ''; | ||
| // Case: [href*=/en]. | ||
| if (lastChar === '*' && tempAttr.indexOf(attrs[key + lastChar]) === -1) { | ||
| shouldAdd = false; | ||
| break; | ||
| } | ||
| // Case: [href^=/en]. | ||
| else if (lastChar === '^' && tempAttr.indexOf(attrs[key + lastChar]) !== 0) { | ||
| shouldAdd = false; | ||
| break; | ||
| } | ||
| // Case: [href$=/en]. | ||
| else if (lastChar === '$' && | ||
| (tempAttr.lastIndexOf(attrs[key + lastChar]) === -1 | ||
| ? false | ||
| : tempAttr.lastIndexOf(attrs[key + lastChar])) | ||
| !== | ||
| tempAttr.length - attrs[key + lastChar].length) { | ||
| shouldAdd = false; | ||
| break; | ||
| } | ||
| // Case: [href=/en]. | ||
| else if (/[\$\*\^]/.test(lastChar) === false && tempAttr !== attrs[key]) { | ||
| shouldAdd = false; | ||
| break; | ||
| } | ||
|
|
||
| } | ||
|
|
||
| if (shouldAdd) { | ||
| tempElements = tempElements.concat([t]); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| elements = elements.concat(tempElements); | ||
| return elements; | ||
| } | ||
|
|
||
| document.querySelectorAll = function <E extends Element = Element>(selector: string): NodeListOf<E> { | ||
| if (typeof selector !== 'string') { | ||
| throw new TypeError('document.querySelectorAll: Invalid selector type. ' + | ||
| 'Expect: string. Found: ' + typeof selector + '.'); | ||
| } | ||
| let elements: Array<E> = []; | ||
|
|
||
| // Split `selector` into rules by `,`. | ||
| let rules: Array<string> = selector.split(',').map(item => item.trim()); | ||
|
|
||
| // Iterate through each rule. | ||
| // For the sake of performance, use for-loop here rather than forEach. | ||
| for (let i = 0, l = rules.length; i !== l; ++i) { | ||
| let rule = rules[i]; | ||
|
|
||
| // TODO: support ' ' and '>'. | ||
| elements = elements.concat(getElementsBySelector.call(this, rule)); | ||
| } | ||
|
|
||
| return (elements as any) as NodeListOf<E>; | ||
| }; | ||
|
|
||
| document.querySelector = function (selector: string): Element | null { | ||
| if (typeof selector !== 'string') { | ||
| throw new TypeError('document.querySelector: Invalid selector type. ' + | ||
| 'Expect: string. Found: ' + typeof selector + '.'); | ||
| } | ||
| let elements = this.querySelectorAll(selector); | ||
| return elements.length > 0 ? elements[0] : null; | ||
| } |
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