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ferris.js

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var ferrisTypes = [

{

attr: 'does_not_compile',

title: 'This code does not compile!'

{

attr: 'panics',

title: 'This code will crash!'

{

attr: 'not_desired_behavior',

title: 'This code does not produce the desired behavior.'

}

]

document.addEventListener('DOMContentLoaded', () => {

for (var ferrisType of ferrisTypes) {

attachFerrises(ferrisType)

}

})

function attachFerrises(type) {

var elements = document.getElementsByClassName(type.attr)

for (var codeBlock of elements) {

var lines = codeBlock.innerText.replace(/\n$/, '').split(/\n/).length

var size = 'large'

if (lines < 5) {

size = 'small'

}

var container = prepareFerrisContainer(codeBlock, size == 'small')

container.appendChild(createFerris(type, size))

}

function prepareFerrisContainer(element, useButtons) {

var foundButtons = element.parentElement.querySelector('.buttons')

if (useButtons && foundButtons) {

return foundButtons

}

var div = document.createElement('div')

div.classList.add('ferris-container')

element.parentElement.insertBefore(div, element)

return div

}

function createFerris(type, size) {

var a = document.createElement('a')

// a.setAttribute('href', 'ch00-00-introduction.html#ferris')

a.setAttribute('target', '_blank')

var toFileName = function (t) {

// return '../img/' + t.attr + '.svg';

if (t.attr == 'panics') {

return '../img/duke_armcross.webp'

}

else if (t.attr == 'does_not_compile') {

return '../img/duke_computer.webp'

}

else if (t.attr == 'not_desired_behavior') {

return '../img/duke_finger.webp'

}

var img = document.createElement('img')

img.setAttribute('src', toFileName(type))

img.setAttribute('title', type.title)

img.classList.add('ferris')

img.classList.add('ferris-' + size)

a.appendChild(img)

return a

}