114 lines
3.6 KiB
JavaScript
114 lines
3.6 KiB
JavaScript
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// Allows browsers to perform doctests.
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// Uses the code highlight package from http://highlightjs.readthedocs.io
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// if available
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var docTestLogMessages = []
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Array.prototype.equals = function(array) {
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return this.length == array.length &&
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this.every( function(this_i,i) { return this_i == array[i] } )
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}
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export default class Doctest {
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static assert(value) {
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if (!value) {
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throw new Error('Assertion violated')
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}
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}
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static pprint(obj) {
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if (obj === null)
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return 'null'
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let stringified = obj.toString()
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if (stringified == '[object Object]')
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return JSON.stringify(obj)
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return stringified
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}
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static expect(expr, value) {
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if (this.pprint(expr) != this.pprint(value)) {
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//throw new Error("got `" + expr + "` but expected `" + value + "`.")
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throw new Error('got `' + this.pprint(expr) + '` but expected `' + this.pprint(value) + '`.')
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}
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}
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static expectError(error, message) {
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let index = error.toString().indexOf(message)
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if (index < 0) {
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throw new Error('got `' + message + '` but expected `' + error + '`.')
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}
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}
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static expectLog(...messages) {
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// if (!docTestLogMessages.equals(messages)) {
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docTestLogMessages.forEach((msg, i) => {
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if (msg != messages[i])
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throw new Error('Unexpected log message: `' + messages[i] + '`.')
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})
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// throw new Error('Uups')
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//}
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}
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static log(message) {
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docTestLogMessages.push(message)
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}
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static highlight(code) {
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if (typeof(hljs) == 'undefined')
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return code
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return hljs.highlight('javascript', code)
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}
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static stripLeadingLines(code) {
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let result = []
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let informative = false
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for(let line of code.split('\n')) {
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if (line.trim().length > 0) {
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informative = true
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}
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if (informative)
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result.push(line)
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}
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return result.join('\n')
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}
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static event(type='mouse', {clientX = 0, clientY = 0} = {}) {
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if (type.startsWith('mouse')) {
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return new MouseEvent(type, { clientX, clientY })
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}
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return { type, clientX, clientY }
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}
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static run(replaceExpect=false) {
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if (typeof(hljs) != 'undefined') {
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hljs.initHighlighting()
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}
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let doctests = document.querySelectorAll('.doctest')
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for(let i=0; i<doctests.length; i++) {
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let doctest = doctests[i]
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let code = this.stripLeadingLines(doctest.innerHTML)
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let text = this.highlight(code)
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let pre = document.createElement('pre')
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// See http://stackoverflow.com/questions/1068280/javascript-regex-multiline-flag-doesnt-work
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// let re = /Doctest\.expect\(([\s\S]*)[\,\s\S]*([\s\S]*)\)/g
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let lines = text.value.split('\n')
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let better = []
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for(let line of lines) {
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if (replaceExpect && line.trim().startsWith('Doctest.expect(')) {
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line = line.replace(/Doctest\.expect\(/, '>>> ').trim()
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if (line.endsWith(')') || line.endsWith(',')) {
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line = line.slice(0, -1)
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}
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}
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better.push(line)
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}
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pre.innerHTML = better.join('\n') // text.value.replace(re, ">>> $1\n$2")
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doctest.parentNode.replaceChild(pre, doctest)
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}
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}
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}
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// Needed to make Doctest visible in modules
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//window.Doctest = Doctest
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