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memo-viz.html
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<!doctype html>
<head>
<meta charset="utf-8">
<title>Incremental Packrat Parsing</title>
<link rel="stylesheet" href="third_party/codemirror-5.23.0/lib/codemirror.css">
</head>
<style>
body {
color: #333;
margin: 20px 60px;
font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
}
#editorContainer {
border: 3px solid transparent;
font-family: Menlo, Monaco, monospace;
margin-bottom: 8px;
transition: border-color .25s ease-in-out;
}
#editorContainer.in-progress {
border: 3px solid #f0f0f0;
}
#editorContainer.failed {
border: 3px solid #D9544F;
}
.CodeMirror {
border: 1px solid #ddd;
font-family: inherit;
font-size: 33px;
height: auto;
}
pre.CodeMirror-line {
padding: 0 1px;
}
#memoIndices {
display: flex;
font-size: 12px;
margin: 4px 2px;
}
#memoIndices .char {
background-color: #f0f0f0;
border: 1px solid #bbb;
box-sizing: border-box;
color: #999;
cursor: default;
display: inline-block;
font-size: 9px;
height: 14px;
line-height: 14px;
margin-right: 1px;
text-align: center;
width: 19px;
vertical-align: middle;
}
#memoIndices .char:hover {
background-color: #999;
border-color: #999;
color: white;
}
#memoEntries {
padding: 0 3px 6px 3px;
position: relative; /* For positioning #stabbedRegion */
}
.memoContents {
margin-bottom: 10px;
}
.extents {
display: flex;
flex-direction: row;
margin: 1px 0;
padding: 0 2px;
}
.ruleName {
color: #666;
/* This must match the font used on `_canvasCtxForMeasuring` below. */
font: 12px system, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
white-space: nowrap;
}
.matched,
.examined {
box-sizing: border-box;
transition: background-color .25s ease-in-out;
}
.matched.velocity-animating,
.examined.velocity-animating {
transition: none;
}
.matched {
background-color: #aaa;
}
.new .matched {
background-color: hsl(207, 66%, 59%);
}
.examined {
background-color: #ddd;
}
.new .examined {
background-color: hsla(205, 69%, 49%, 0.3);
}
.failed {
color: #DB524B;
}
#stabbedRegion {
bottom: 0;
background-color: hsla(245, 72%, 75%, 0.35);
border: 0 solid hsla(245, 72%, 75%, 0.8);
box-shadow: 0 1px 3px rgba(255, 255, 255, 0.8);
box-sizing: border-box;
position: absolute;
top: 0;
}
#grammar {
padding-bottom: 20px;
}
#grammar > pre {
font-family: Menlo, Monaco, monospace;
font-size: 12px;
margin-left: 20px;
}
.breadcrumb {
background-color: #eceeef;
border-radius: 4px;
display: inline-block;
padding: 12px 16px;
}
p {
line-height: 1.4;
}
#content {
max-width: 960px;
}
</style>
<div id="content">
<div class="breadcrumb">‹ <a href="https://ohmlang.github.io/sle17/">Incremental Packrat Parsing</a></div>
<p>The visualization below demonstrates the algorithm presented in <a href="https://ohmlang.github.io/pubs/sle2017/incremental-packrat-parsing.pdf">our SLE'17 paper</a>. It accepts the same rudimentary arithmetic language presented in
Section 2:
<div id="grammar">
<pre>expr = num "+" num
| num "-" num
num = digit+
digit = "0".."9"</pre>
</div>
<div id="main"></div>
</div>
<script src="third_party/codemirror-5.23.0/lib/codemirror.js"></script>
<script src="third_party/velocity-animate-1.4.2.js"></script>
<script src="third_party/vue-2.1.10.js"></script>
<script src="src/standard.js"></script>
<script src="src/incremental.js"></script>
<script>
// Helpers
// -------
const canvasCtxForMeasuring = document.createElement('canvas').getContext('2d');
canvasCtxForMeasuring.font =
'12px system, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif';
function measureRuleNameText(text) {
var metrics = canvasCtxForMeasuring.measureText(text);
return metrics.width + 2;
}
function charWidth(count) {
return (count * 20);
}
function assert(cond, optMessage) {
if (!cond) {
throw new Error(optMessage || 'assertion failed');
}
}
function filter(list, fn) {
return Array.prototype.filter.call(list, fn);
}
function forEach(list, fn) {
Array.prototype.forEach.call(list, fn);
}
function mapToObj(map, i, h) {
const ans = Object.create(null);
if (map) {
map.forEach((v, k) => ans[k] = v);
}
return ans;
}
let nextId = 0;
const extMemoRecs = new WeakMap();
const posInfoIds = new WeakMap();
// memo-value
// ----------
Vue.component('memo-value', {
props: {
val: Object,
pos: Number,
selection: Object
},
data() {
return {isNew: true};
},
computed: {
classObj() {
return {
invalid: this.isAffected,
new: this.isNew
};
},
successClass() {
return this.val.cst == null ? 'failed' : 'succeeded';
},
examinedStyle() {
const matchLen = this.val.cst == null ? 0 : this.val.matchLength;
return {
width: charWidth(this.val.examinedLength - matchLen) + 'px'
};
},
matchedStyle() {
return {
width: charWidth(this.val.matchLength) + 'px'
};
},
ruleNameStyle() {
// Use relative positioning to place the label to the left of the bars.
return {
position: 'relative',
left: -measureRuleNameText(this.val.ruleName) - 3 + 'px',
width: 0
}
},
// Return true if this memo value is (or will be) affected by an edit.
isAffected() {
const endPos = this.pos + this.val.examinedLength;
const selStart = this.selection.start;
const selEnd = this.selection.end;
return this.pos < selStart && selStart < endPos ||
this.pos < selEnd && selEnd < endPos ||
selStart <= this.pos && endPos <= selEnd;
}
},
template: `
<div class="extents" :class="classObj">
<div class="ruleName" :class="successClass" :style="ruleNameStyle">{{ val.ruleName }}</div>
<div class="matched" :style="matchedStyle"></div>
<div class="examined" :style="examinedStyle"></div>
</div>`,
mounted() {
this.$el.style.display = 'none';
},
beforeUpdate() {
this.isNew = false;
}
});
// memo-contents
// -------------
Vue.component('memo-contents', {
props: {
entries: Object,
pos: Number,
selection: Object,
},
computed: {
memoValues() {
const ans = [];
if (!this.entries) {
return ans;
}
for (let ruleName in this.entries) {
const memoRec = this.entries[ruleName];
// Skip 'start', as it's sort of an implementation detail.
if (ruleName === 'start') {
continue;
}
if (!extMemoRecs.has(memoRec)) {
const failed = memoRec.cst == null;
extMemoRecs.set(memoRec, Object.assign({
id: nextId++,
ruleName: (failed ? '✗ ' : '') + ruleName,
matchLength: 0
}, memoRec));
}
ans.push(extMemoRecs.get(memoRec));
}
return ans;
},
styleObj() {
return {position: 'relative', left: this.posLeft + 'px'};
},
posLeft() {
return charWidth(this.pos);
}
},
watch: {
posLeft(newVal, oldVal) {
this.$emit('beforeTransition', this);
const tx = oldVal - newVal;
Velocity(this.$el, {translateX: [0, tx]}, {
duration: 2000,
begin: () => this.$el.style.transform = `translateX(${tx}px)`,
complete: () => this.$emit('completeTransition'),
});
}
},
template: `
<div class="memoContents" :style="styleObj">
<memo-value v-for="val in memoValues" :key="val.id"
:val="val" :pos="pos" :selection="selection" />
</div>`,
});
// Root component
// --------------
const vm = new Vue({
el: '#main',
data: {
hoveredIdx: -1,
memoTable: [],
selection: {start: 0, end: 0},
activeTransitionCount: 0,
changeInProgress: false,
matchSucceeded: false
},
computed: {
classObj() {
if (this.changeInProgress) {
return 'in-progress';
} else if (!this.matchSucceeded) {
return 'failed';
}
},
stabbedRegionStyle() {
const selectionSize = this.selection.end - this.selection.start;
return {
borderLeftWidth: '2px',
borderRightWidth: selectionSize === 0 ? '0' : '2px',
left: charWidth(this.selection.start) + 4 + 'px',
width: charWidth(selectionSize) + 'px'
};
},
},
watch: {
changeInProgress(newVal) {
// Make the editor read-only whenever a change is in progress.
this._editor.setOption('readOnly', newVal);
}
},
template: `
<div id="main">
<div id="editorContainer" :class="classObj"></div>
<div id="memoEntries">
<memo-contents v-for="(data, i) in memoTable" :key="data.key"
:entries="data.entries"
:pos="i"
:selection="selection"
@beforeTransition="beforeTransition"
@completeTransition="completeTransition" />
<div id="stabbedRegion" :style="stabbedRegionStyle"></div>
</div>
</div>`,
methods: {
beforeTransition() {
this.activeTransitionCount += 1;
},
completeTransition() {
this.activeTransitionCount -= 1;
},
getKey(posInfo) {
if (posInfo == null) {
return -1;
}
if (posInfoIds.has(posInfo)) {
return posInfoIds.get(posInfo);
}
const id = nextId++;
posInfoIds.set(posInfo, id);
return id;
},
waitForActiveTransitions(cb) {
if (this.activeTransitionCount === 0) {
cb();
} else {
const unwatch = this.$watch('activeTransitionCount', (count) => {
if (count === 0) {
unwatch();
cb();
}
});
}
},
updateMemoTable() {
this.memoTable = this._matcher.memoTable.map(v => {
return {
entries: mapToObj(v && v.memo),
key: this.getKey(v && v.memo)
};
});
},
removeInvalidEntries() {
const invalidEls = this.$el.querySelectorAll('.invalid');
if (invalidEls.length === 0) {
return Promise.resolve();
}
Velocity(invalidEls, 'fadeOut', {
duration: 1500,
display: 'flex'
});
return Velocity(invalidEls, 'slideUp', {
duration: 1000
});
},
replaceInputRange(from, to, text) {
return new Promise(cb => {
this._matcher.applyEdit(from, to, text);
this.updateMemoTable();
this._editor.replaceSelection(text);
Vue.nextTick(cb);
});
},
transitionMovedEntries() {
return new Promise(this.waitForActiveTransitions);
},
matchInput(cb) {
return new Promise(cb => {
this.matchSucceeded = this._matcher.match();
this.updateMemoTable();
setTimeout(cb, 0);
});
},
transitionNewEntries(optDuration) {
const duration = typeof optDuration === 'number' ? optDuration : 1000;
const newEls = this.$el.querySelectorAll('.extents.new');
Velocity.hook(newEls, 'display', 'flex');
if (duration === 0 || newEls.length === 0) {
return Promise.resolve(); // No more work to do.
}
Velocity(newEls, 'slideDown', {
begin: els => Velocity.hook(els, 'opacity', 0),
duration: duration * 5/6
});
return Velocity(newEls, 'fadeIn', {
duration: duration * 1/6,
display: 'flex',
complete: (els) => Velocity.hook(els, 'opacity', '')
});
}
},
created() {
var _ = value => new Terminal(value);
var app = ruleName => new RuleApplication(ruleName);
var seq = (...exps) => new Sequence(exps);
var choice = (...exps) => new Choice(exps);
var rep = exp => new Repetition(exp);
var not = exp => new Not(exp);
this._matcher = new Matcher({
start: app('expr'),
expr: choice(seq(app('num'), _('+'), app('num')),
seq(app('num'), _('-'), app('num'))),
num: seq(app('digit'), rep(app('digit'))),
digit: choice(_('0'), _('1'), _('2'), _('3'), _('4'), _('5'), _('6'), _('7'), _('8'), _('9'))
});
},
mounted() {
const editor = this._editor = CodeMirror(this.$el.querySelector('#editorContainer'));
// Set an initial value.
this._matcher.applyEdit(0, 0, '896-7')
editor.setValue(this._matcher.input);
editor.on('beforeChange', (cm, change) => {
if (!this.changeInProgress) {
const from = cm.indexFromPos(change.from);
const to = cm.indexFromPos(change.to);
const changeText = change.text.join('\n');
this.changeInProgress = true;
change.cancel();
// When the user hits backspace, ensure the selection includes the deleted char.
if (changeText === '') {
this._editor.setSelection(change.from, change.to);
}
Vue.nextTick()
.then(() => this.removeInvalidEntries())
.then(() => this.replaceInputRange(from, to, changeText))
.then(() => this.transitionMovedEntries())
.then(() => this.matchInput())
.then(() => this.transitionNewEntries())
.then(() => this.changeInProgress = false);
}
});
editor.on('cursorActivity', cm => {
const sel = cm.listSelections()[0];
const [start, end] =
[sel.anchor, sel.head].map(s => cm.indexFromPos(s)).sort();
this.selection = {start, end};
});
editor.focus();
this.matchInput();
this.$nextTick(() => this.transitionNewEntries(0));
},
});
</script>