Created
April 29, 2021 13:59
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class Router { | |
constructor() { | |
this.#init(); | |
} | |
#paths = {}; | |
#redirect(url) { | |
if (url === '/404') { | |
window.history.replaceState(null, null, url); | |
} else { | |
window.history.pushState(null, null, url) | |
}; | |
this.#checkPatterns(url); | |
} | |
#handleError() { | |
console.error('Page not found'); | |
this.#redirect('/404'); | |
} | |
#transformRegexOutput(input) { | |
try { | |
return Object | |
.keys(input) | |
.filter(key => Number(key)) | |
.reduce((obj, key) => ({ ...obj, [key]: input[key] }), {}); | |
} catch (error) { | |
this.#handleError(); | |
return {}; | |
} | |
} | |
#mergeObjects(obj1, obj2) { | |
let iterator = -1; | |
return Object | |
.entries(obj1) | |
.reduce((obj, key, index) => { | |
if (obj1[index + 1] == '*') iterator += 1; | |
return ({ ...obj, [obj1[index + 1] == '*' ? iterator : obj1[index + 1].substring(1)]: obj2[index + 1] }) | |
}, {}) | |
} | |
#parsePattern(pattern) { | |
return '^' + pattern | |
.replace(/\\/g, '\\/') | |
.replace(/(\*|:\w*)/gm, '(:?[A-z0-9|*]*)') + '(?:\\/?)$'; | |
} | |
get(pattern, callback) { | |
const paths = this.#paths; | |
if (!paths[pattern]) { | |
paths[pattern] = {}; | |
paths[pattern].callbacks = []; | |
} | |
paths[pattern].reg = this.#parsePattern(pattern); | |
paths[pattern].callbacks.push(callback); | |
return true; | |
} | |
#checkIfAnyPatternIsMatching(url) { | |
return (element, index, array) => { | |
const pattern = this.#paths[element].reg; | |
const newRegex = new RegExp(pattern, 'i').exec(url); | |
if (!newRegex) { return false }; | |
return true; | |
} | |
} | |
#getParams(pattern, url) { | |
const parsedPattern = this.#paths[pattern].reg; | |
const regex = new RegExp(parsedPattern, 'i'); | |
const tokens = this.#transformRegexOutput(regex.exec(pattern)); | |
const params = this.#transformRegexOutput(regex.exec(url)); | |
return this.#mergeObjects(tokens, params); | |
} | |
#processURL(pattern, url) { | |
const result = this.#getParams(pattern, url); | |
return this.#paths[pattern].callbacks.forEach(callback => callback(result)); | |
} | |
#checkPatterns(url) { | |
const result = Object.keys(this.#paths).find(this.#checkIfAnyPatternIsMatching(url)); | |
if (!result) { | |
this.#handleError(); | |
return false; | |
} | |
this.#processURL(result, url); | |
return true; | |
} | |
#init() { | |
this.get('/', data => { | |
// console.log('/') | |
}); | |
this.get('/404', data => { | |
// console.log('/404') | |
}); | |
document.addEventListener('click', event => { | |
const target = event.target.closest('a'); | |
if (!target) { | |
return; | |
} | |
if (target.hostname === location.hostname) { | |
event.preventDefault(); | |
this.#redirect(target.getAttribute("href")); | |
} | |
}, false); | |
window.addEventListener('DOMContentLoaded', event => { | |
event.preventDefault(); | |
this.#checkPatterns(location.pathname); | |
}); | |
window.addEventListener('popstate', event => { | |
//event.preventDefault(); | |
this.#checkPatterns(location.pathname); | |
}); | |
} | |
} | |
export default Router; |
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