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Copy pathdiff.js
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658 lines (567 loc) · 16 KB
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function isArray(o) {
return typeof o === 'object' && o.constructor === Array
}
function isOp(s) {
return typeof s === 'string' && /^[ ~+-]$/.test(s)
}
function isStack(obj) {
return obj === null // empty stack
|| (isArray(obj) && isArray(obj[0]))
}
function el(tagName, className, textContent, children) {
if (className === undefined) { className = tagName; tagName = 'div'; }
var el = document.createElement(tagName);
if (className) el.className = className;
if (textContent) el.textContent = textContent;
(children || []).forEach(function(child) {
el.appendChild(child);
});
return el;
}
function makeSection(title, small) {
var triangle = el('span', 'disclosure-triangle', '▼');
var heading = el(small ? 'h3' : 'h2', null, null, [
triangle,
document.createTextNode(title),
]);
var section = el('closeable');
heading.addEventListener('click', function() {
triangle.classList.toggle('closed');
section.classList.toggle('closed');
});
return {
heading: heading,
triangle: triangle,
section: section,
//content: section,
};
}
function makeSubSection(title) {
var s = makeSection(title, true)
var content = el('content');
s.section.appendChild(content);
s.content = s.section
return s
}
var compareButton = document.getElementById('compare-button');
function checkEnterKey(event) {
if (event.keyCode === 13) {
go();
if (event.target === compareButton) {
compareButton.classList.add('pressed');
window.setTimeout(function() {
compareButton.classList.remove('pressed');
}, 200);
}
}
}
compareButton.addEventListener('keydown', checkEnterKey);
compareButton.addEventListener('click', go);
var Task = function(size) {
this.size = size | 0;
this.frac = 0.0;
};
var Input = function(el) {
this.el = el;
this.input = el.querySelector('input');
this.progressBar = el.querySelector('.progress');
this.input.addEventListener('keydown', checkEnterKey);
var myself = this;
this.input.addEventListener('input', function(event) {
myself.fixValue();
updateHash();
});
this.tasks = [];
};
Input.prototype.getValue = function() {
return this.input.value.replace(/[^0-9]+/g, '');
};
Input.prototype.fixValue = function() {
var selStart = this.selectionStart;
var selEnd = this.selectionEnd;
this.setValue(this.getValue());
this.selectionStart = selStart;
this.selectionEnd = selEnd;
};
Input.prototype.setValue = function(value) {
value = value.replace(/[^0-9]+/g, '');
var newValue = "scratch.mit.edu/projects/" + value;
if (this.input.value !== newValue) this.input.value = newValue;
}
Input.prototype.setProgress = function(frac) {
var fullWidth = this.input.offsetWidth;
var actualFrac = (frac * 0.95) + 0.05;
this.progressBar.style.width = (actualFrac * fullWidth) + 'px';
};
Input.prototype.updateProgress = function(frac) {
var totalSize = 0;
var totalComplete = 0.0;
this.tasks.forEach(function(task) {
totalSize += task.size;
totalComplete += task.size * task.frac;
});
var frac = totalComplete / totalSize;
this.setProgress(frac);
};
Input.prototype.get = function(url, type, cb) {
var xhr = new XMLHttpRequest();
var task = new Task(5000); // arbitrary number, 'cos we don't know any better
this.tasks.push(task);
var myself = this;
xhr.addEventListener('progress', function(event) {
if (event.lengthComputable) {
task.frac = event.loaded / event.total;
task.size = event.total;
myself.updateProgress();
}
});
this.updateProgress();
xhr.addEventListener('load', function(event) {
task.frac = 1.0;
myself.updateProgress();
cb(xhr.response);
});
var failed = function(event) {
console.log(event);
myself.error();
cb(null);
};
xhr.addEventListener('error', failed);
xhr.addEventListener('abort', failed);
xhr.open('GET', url, true);
xhr.responseType = type;
xhr.send();
};
Input.prototype.error = function() {
this.el.classList.add('error');
};
Input.prototype.fetch = function(cb) {
this.el.classList.remove('error');
this.tasks = [];
this.fixValue();
this.input.blur();
this.setProgress(0.05);
this.progressBar.classList.remove('animated');
window.setTimeout(function() {
myself.progressBar.classList.add('on');
myself.progressBar.classList.add('animated');
}, 10);
var id = this.getValue();
var url = "http://projects.scratch.mit.edu/internalapi/project/" + id + "/get/";
var myself = this;
this.get(url, '', function(data) {
if (!data) {
cb(null, {});
return;
}
try {
var project = JSON.parse(data);
} catch (e) {
myself.error();
cb(null, {});
return;
}
var assets = [];
var remaining = [];
project.children.concat([project]).forEach(function(obj) {
if (obj.costumes) {
obj.costumes.forEach(function(costume) {
var md5 = costume.baseLayerMD5;
var url = assetURL(md5);
var type = /svg/.test(md5) ? 'text' : 'blob'
myself.get(url, type, function(data) {
assets[md5] = data;
var index = remaining.indexOf(md5);
remaining.splice(index, 1);
if (!remaining.length) {
window.setInterval(function() {
myself.progressBar.classList.remove('on');
}, 500);
cb(project, assets);
}
});
remaining.push(md5);
});
}
});
});
};
function assetURL(md5) {
return "http://cdn.assets.scratch.mit.edu/internalapi/asset/" + md5 + "/get/";
}
var leftInput = new Input(document.getElementById('left'));
var rightInput = new Input(document.getElementById('right'));
var changes = document.getElementById('changes');
function updateHash() {
window.location.hash = leftInput.getValue() + '+' + rightInput.getValue();
}
function readHash() {
var hash = window.location.hash;
if (hash) {
var parts = hash.split('+');
if (parts.length == 2) {
leftInput.setValue(parts[0]);
rightInput.setValue(parts[1]);
}
}
updateHash();
}
readHash();
if (leftInput.getValue() && rightInput.getValue()) go();
window.setInterval(readHash, 500);
function go(event) {
compareButton.blur();
changes.innerHTML = '';
var status = el('div', 'content', 'Fetching…');
changes.appendChild(status);
fetchBoth(function(left, right, assets) {
status.textContent = 'Comparing…'
if (left === null || right === null) {
status.textContent = 'Whoops! Something went wrong.';
status.classList.add('error');
return;
}
// DEBUG
window.left = left;
window.right = right;
var result = compare(left, right, assets);
changes.innerHTML = '<div class="content hint">removals highlighted <span class=delete>red</span>; additions highlighted <span class=insert>green</span>';
result.forEach(function(r) {
changes.appendChild(r);
});
var footer = el('div', 'footer');
footer.innerHTML = 'Uses <a href="//github.com/cemerick/jsdifflib">jsdifflib</a>';
changes.appendChild(footer);
scratchblocks.renderMatching('.blocks');
});
}
function fetchBoth(cb) {
var left;
var right;
var bothAssets = {};
leftInput.fetch(function(project, assets) {
left = project;
Object.keys(assets).forEach(function(md5) {
bothAssets[md5] = assets[md5];
});
if (right !== undefined) cb(left, right, bothAssets);
});
rightInput.fetch(function(project, assets) {
right = project;
Object.keys(assets).forEach(function(md5) {
bothAssets[md5] = assets[md5];
});
if (left !== undefined) cb(left, right, bothAssets);
});
};
function compare(left, right, assets) {
var out = []
// Use scratch-diff to, um, do the diff.
var diff = scratch_diff(left, right)
diff.forEach(sprite => {
let [op, info] = sprite
// TODO scratch-diff: Stage has no name
// TODO scratch-diff: handle rename
var s = makeSection(info.name);
let section
out.push(s.heading)
out.push(section = s.section)
if (op === ' ') {
s.heading.removeChild(s.triangle);
return
}
if (op !== '~') {
var insert = op === '+'
s.heading.classList.add(insert ? 'insert' : 'delete')
//section.appendChild(el('p', 'content', insert ? '(new sprite)' : '(sprite deleted)'))
s.heading.removeChild(s.triangle);
return
}
if (info.costumes) {
var b = renderCostumes(info.costumes, assets)
section.appendChild(b.heading)
section.appendChild(b.section)
}
if (info.sounds) {
var b = renderSounds(info.sounds, assets)
section.appendChild(b.heading)
section.appendChild(b.section)
}
if (info.scripts) {
var b = renderScripts(info.scripts)
section.appendChild(b.heading);
section.appendChild(b.section);
}
})
return out;
}
function renderCostumes(diff, assets) {
return renderMedia({
title: 'Costumes',
kind: 'costumes',
diff: diff,
render(info) {
var icon = el('img', null)
icon.src = /svg/.test(info.md5) ? 'data:image/svg+xml;utf8,' + assets[info.md5] : URL.createObjectURL(assets[info.md5])
return icon
},
})
}
function renderSounds(diff, assets) {
return renderMedia({
title: 'Sounds',
kind: 'sounds',
diff: diff,
render(info) {
var audio = el('audio', null)
audio.src = assetURL(info.md5)
audio.controls = true
return audio
},
})
}
function getKeyRecursive(which) {
return function getKey(obj) {
if (typeof obj !== 'object') {
return obj
}
if (obj[which]) {
return obj[which]
}
if (isArray(obj)) {
if (isArray(obj[0]) && isOp(obj[0][0])) {
let out = []
obj.forEach(item => {
let [op, value] = item
if (op === '+' && which === '__old') return
if (op === '-' && which === '__new') return
out.push(getKey(value))
})
return out
}
return obj.map(x => getKey(x))
}
var old = {}
for (var key in obj) {
old[key] = getKey(obj[key])
}
return old
}
}
let getOld = getKeyRecursive('__old')
let getNew = getKeyRecursive('__new')
function renderMedia(props) {
var b = makeSubSection(props.title)
var result = el('div', props.kind)
b.content.appendChild(result)
function append(op, info) {
var icon = props.render(info)
var link = el('a', null);
link.href = assetURL(info.md5)
link.appendChild(icon);
result.appendChild(el('div', op + ' media', null, [
link,
el('div', 'name', info.name),
]));
}
function skip() {
result.appendChild(el('div', 'media unchanged', null))
}
props.diff.forEach(media => {
let [op, info] = media
// TODO group ~'s
if (op === '~') {
append('delete', getOld(info))
append('insert', getNew(info))
} else if (op === ' ') {
// TODO render unchanged images?
skip()
} else {
append(op === '+' ? 'insert' : 'delete', info)
}
})
return b
}
function annotate(o, y, draw) {
switch (o.constructor) {
case scratchblocks.Block:
if (o.op) {
draw(o, y)
}
o.children.forEach(child => {
if (child.constructor === scratchblocks.Script) {
if (isNaN(child.y)) throw 'ohno'
annotate(child, y + child.y, draw)
}
})
break
case scratchblocks.Script:
// TODO highlight?
if (isNaN(o.y)) throw 'ohno'
y += o.y
o.blocks.forEach(block => {
annotate(block, y, draw)
y += block.height
})
break
case scratchblocks.Document:
o.scripts.forEach(script => annotate(script, 0, draw))
break
}
}
let SVG = {
el(name, props) {
var el = document.createElementNS('http://www.w3.org/2000/svg', name);
if (name === 'svg') {
// explicit set namespace, see https://github.com/jindw/xmldom/issues/97
el.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
el.setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');
}
return SVG.setProps(el, props);
},
directProps: {
textContent: true,
},
setProps(el, props) {
for (var key in props) {
var value = '' + props[key];
if (SVG.directProps[key]) {
el[key] = value;
} else if (props[key] !== null && props.hasOwnProperty(key)) {
el.setAttribute(key, value);
}
}
return el;
},
rect(w, h, props) {
return SVG.el('rect', Object.assign({}, props, {
x: 0,
y: 0,
width: w,
height: h,
}));
},
move(dx, dy, el) {
SVG.setProps(el, {
transform: ['translate(', dx, ' ', dy, ')'].join(''),
});
return el;
},
}
function makeBlock(op, json) {
let lang = scratchblocks.allLanguages.en
let block = scratchblocks.Block.fromJSON(lang, json)
block.op = op
// TODO might need to remove stacks here.
return block
}
function makeScript(op, json) {
let lang = scratchblocks.allLanguages.en
let script = scratchblocks.Script.fromJSON(lang, json)
script.op = op
return script
}
function scratchblocksFromDiff(diff) {
function fromBlock(block, push) {
// straight-up replace? selector changed?
if (block.__old || block[0][0] !== ' ') {
push(makeBlock('-', getOld(block)))
push(makeBlock('+', getNew(block)))
return
}
var children = block.map(item => item[1])
var hasStacks = children.some(isStack)
var stackAdjust = block.some(item => {
return (item[0] === '+' || item[0] === '-') && isStack(item[1])
})
// TODO using isStack on ops does not work!
var argsModified = block.some(item => {
return !isStack(item[1]) && item[0] !== ' '
})
var args = block.filter(item => !isStack(item[1]))
if (hasStacks) {
if (stackAdjust) {
// TODO panic
throw 'oh no'
}
var stacks = []
block.forEach(item => {
let [op, script] = item
if (isStack(script)) {
stacks.push(op === ' ' ? makeScript(null, script) : fromScript(script))
}
})
if (argsModified) {
// pop the stacks first.
push(makeBlock('-', getOld(args)))
b = makeBlock('+first', getNew(args))
} else {
b = makeBlock(null, getNew(args))
}
for (var i=0; i<b.children.length; i++) {
if (b.children[i].isScript) {
b.children[i] = stacks.shift()
}
}
push(b)
} else {
push(makeBlock('-', getOld(block)))
push(makeBlock('+', getNew(block)))
}
}
function fromScript(script) {
if (!(isArray(script) && isArray(script[0]) && isOp(script[0][0]))) throw new Error('not a script')
let blocks = []
if (script.__old) {
throw 'todo'
// getOld(script).forEach() {
// }
}
script.forEach(item => {
let [op, block] = item
if (op === '~') {
fromBlock(block, x => blocks.push(x))
} else {
blocks.push(makeBlock(op, block))
}
})
return new scratchblocks.Script(blocks)
}
return new scratchblocks.Document([fromScript(diff)])
}
function renderScripts(diff) {
var b = makeSubSection('Scripts')
var result = el('div', 'scripts')
b.content.appendChild(result)
diff.forEach(item => {
let [op, script] = item
if (op === ' ') return
// add/remove entire scripts
if (op === '+' || op === '-') {
// TODO
return
}
// script modified
console.log(script)
var doc = scratchblocksFromDiff(script)
doc.render(svg => {
let w = doc.width
annotate(doc, 0, (block, y) => {
let op = block.op
if (!op || op === ' ') return
let h = /first/.test(op) ? 30 : block.height // TODO 30 is a hack
let class_ = op[0] === '+' ? 'insert' : op[0] === '-' ? 'delete' : 'unknown'
var below = SVG.move(0, y, SVG.rect(w, h, {
class: class_ + ' below',
}))
svg.insertBefore(below, svg.children[1])
var above = SVG.move(0, y, SVG.rect(w, h, {
class: class_ + ' above',
}))
svg.appendChild(above)
})
b.content.appendChild(svg)
})
})
return b
}