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index.html
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<html>
<!-- Full disclosure: JavaScript is not my forte and neither is CSS. -B -->
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<meta name="viewport" content="width=640, initial-scale=1">
<head>
<title>Warframe Shawzin Tab Generator</title>
</head>
<!-- embedded favicon because why not -->
<link href="data:image/png;base64,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" rel="icon" type="image/png" />
<style type="text/css">
/* general formatting */
* {
font-family: sans-serif;
color: #B0B0B0;
}
body {
background-color: #202020;
}
input, textarea {
color: #000000;
}
.title {
font-weight: bold;
font-size: 100%;
color: #80A0D0;
display: inline;
}
.titleBar {
background-color: #404040;
margin: 1ex;
padding: 1ex;
border-radius: 1ex;
text-align: middle;
}
.titleBar .businessDiv {
margin: 2ex 1ex 1ex 1ex;
}
.mainTitle {
font-weight: bold;
text-align: center;
font-size: 200%;
color: #FFFFFF;
}
.subTitle {
font-weight: bold;
text-align: center;
font-size: 150%;
color: #FFFFFF;
}
.label {
color: #FFFFFF;
}
a {
color: #8080FF
}
a:visited {
color: #D080FF
}
ul {
list-style-type: disc;
}
li {
margin: 0ex 0ex 1ex 0ex;
}
/* help section formatting */
#lotsOfWordsContainer, .footerContainer {
background-color: #202020;
margin: 1ex;
padding: 1ex;
border-radius: 1ex;
text-align: center;
}
.lotsOfWords, .footer {
max-width: 100ex;
display: inline-block;
text-align: left;
}
.footer {
font-weight: bold;
font-size: 100%;
}
.about {
text-align: center;
}
h1, h2, h3, h4 {
color: A0C0F0;
}
strong {
color: 6080B0;
}
.warn, .warn * {
color: D06040;
}
#TOC li {
margin: 0;
}
/* notes formatting */
.notes tr td {
padding: 0.1ex 0.25ex 1ex 0.25ex;
vertical-align: text-top;
}
.notes tr td:first-child {
width: 33%;
text-align: right;
}
/*
For some unknown reason, the font size on moble devices is much smaller, but only on the first column on the
notes tables. Work around using a media query for a coarse pointer (usually denotes a phone or tablet).
*/
@media only screen and (pointer: coarse) {
.notes tr td:first-child {
font-size: 150%;
}
}
/* error bar formatting */
#errorBar {
text-align: center;
}
#error {
background-color: #B00000;
font-weight: bold;
text-align: left;
color: #FFFFFF;
margin: 1ex;
padding: 1ex;
border-radius: 1ex;
display: inline-block;
}
.errorLine {
font-weight: bold;
color: #FFFFFF;
}
/* Buttons */
.button {
margin: 1ex 1ex 1ex 1ex;
cursor: pointer;
}
.utilGroup {
text-align: center;
}
.util, .utilHidden {
margin: 1ex 0ex 1ex 0ex;
}
.util {
display: inline;
}
.utilHidden {
display: none;
}
.button, #meteredDiv, #meterDiv, #tempoDiv, #measuresPerLineDiv, #leadInBeatsDiv, #secondsPerLineDiv, .start, .urlButton {
background-color: #808080;
border: none;
color: #FFFFFF;
padding: 1ex;
text-align: center;
text-decoration: none;
font-size: 100%;
border-radius: 1ex;
display: block-inline;
}
.songContainer {
text-align: center;
}
.songDiv {
display: inline-block;
text-align: left;
}
#songTitleDiv, #authorDiv, #songCodeDiv {
background-color: #404080;
border: none;
color: #FFFFFF;
padding: 1ex;
text-align: left;
text-decoration: none;
font-size: 100%;
border-radius: 1ex;
display: block;
}
.start {
background-color: #60A060;
}
.stop {
background-color: #A06060;
}
.urlButton, {
background-color: #406080;
}
.density, .cumulative, .query {
background-color: #404040;
color: #D0D0D0;
}
.densitySelected, .cumulativeSelected, .querySelected {
background-color: #80A0D0;
color: #FFFFFF;
}
/* Fields */
.inputName, .inputTime, .inputRequired, .inputCount, .inputRate, .inputRange, .inputStopAfter, .inputResult, .inputPercentile {
background-color: #101010;
border: none;
color: #B0B0B0;
font-size: 75%;
padding: 1ex;
border-radius: 1ex;
}
.inputBailEarly, #copyUrlAutoStart {
background-color: #101010;
border: none;
color: #B0B0B0;
}
#samplesSelect, .rivenTypeSelect {
background-color: #101010;
border: none;
color: #B0B0B0;
font-size: 100%;
padding: 1ex;
border-radius: 1ex;
}
/* graying everthing out when disabled */
.rivenTypeSelect:disabled {
background-color: #202020;
}
.button:disabled {
background-color: #404040;
color: #B0B0B0;
cursor: not-allowed;
}
.inputName:disabled, .inputTime:disabled, .inputRequired:disabled, .inputCount:disabled, .inputRate:disabled, .inputRange:disabled, .inputStopAfter:disabled, .inputResult:disabled, .inputPercentile:disabled {
background-color: #202020;
color: #B0B0B0;
cursor: not-allowed;
}
.inputStopAfter:disabled {
background-color: #404040;
}
.inputBailEarly:disabled, #copyUrlAutoStart:disabled {
background-color: #202020;
color: #B0B0B0;
cursor: not-allowed;
}
#samplesSelect:disabled {
background-color: #202020;
color: #B0B0B0;
cursor: not-allowed;
}
#tabArea {
background-color: #FFFFFF;
border: none;
color: #000000;
font-size: 75%;
padding: 1ex;
border-radius: 1ex;
text-align: center;
}
/* tooltips, adapted from https://www.w3schools.com/css/css_tooltip.asp */
.tooltip {
position: relative;
display: inline-block;
}
.tooltip:hover .tooltiptext, .tooltip:hover .tooltiptextbottom {
visibility: visible;
opacity: 1;
}
/* fix the link colors inside tooltips */
.tooltip a {
color: #0000FF
}
.tooltip a:visited {
color: #B000FF
}
/* right side tooltip */
.tooltip .tooltiptext {
visibility: hidden;
width: 50ex;
background-color: #C0C0C0;
color: #4040A0;
text-align: center;
border-radius: 0.5ex;
padding: 1ex;
position: absolute;
z-index: 1;
top: 1ex;
left: calc(100% + 2ex);
opacity: 0;
transition: opacity 500ms;
transition-delay: 1s;
}
.tooltip .tooltiptext::after {
content: "";
position: absolute;
top: 2.25ex;
right: 100%;
margin-top: -1ex;
border-width: 1ex;
border-style: solid;
border-color: transparent #C0C0C0 transparent transparent;
}
/* bottom side tooltip */
.tooltip .tooltiptextbottom {
visibility: hidden;
width: 30ex;
background-color: #C0C0C0;
color: #4040A0;
text-align: center;
border-radius: 0.5ex;
padding: 1ex;
position: absolute;
z-index: 1;
top: 120%;
left: calc(50% - 15ex);
margin-left: -2ex;
opacity: 0;
transition: opacity 500ms;
transition-delay: 1s;
}
.tooltip .tooltiptextbottom::after {
content: "";
position: absolute;
bottom: 100%; /* At the top of the tooltip */
left: 50%;
margin-left: -1ex;
border-width: 1ex;
border-style: solid;
border-color: transparent transparent #C0C0C0 transparent;
}
/* popup, adapted from https://www.w3schools.com/howto/howto_js_popup.asp */
.popup {
position: relative;
display: inline-block;
cursor: pointer;
}
.popup .popuptext {
visibility: hidden;
width: 50ex;
background-color: #C0C0C0;
color: #000080;
text-align: center;
border-radius: 0.5ex;
padding: 1ex;
position: absolute;
z-index: 1;
top: 120%;
left: -40ex;
margin-left: -2ex;
}
.popup .popuptext::after {
content: "";
position: absolute;
bottom: 100%; /* At the top of the tooltip */
right: 2ex;
margin-left: -1ex;
border-width: 1ex;
border-style: solid;
border-color: transparent transparent #C0C0C0 transparent;
}
.popup .show {
visibility: visible;
animation: fadeIn 1s
}
#urlHolder {
color: #000000;
}
</style>
<body onload="initModel()">
<script type="text/javascript" language="javascript">
// todo: make this configurable?
var stringThreeOnTop = true;
// thanks to https://www.reddit.com/r/Warframe/comments/cxbxoc/shawzin_song_recording_syntax/
var scale_map = new Map();
scale_map.set('1', 'Pentatonic Minor');
scale_map.set('2', 'Pentatonic Major');
scale_map.set('3', 'Chromatic');
scale_map.set('4', 'Hexatonic');
scale_map.set('5', 'Major');
scale_map.set('6', 'Minor');
scale_map.set('7', 'Hirajoshi');
scale_map.set('8', 'Phrygian');
scale_map.set('9', 'Yo');
var base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
function base64ToInt(char) {
// todo: better?
var index = base64Chars.indexOf(char);
if (index < 0) {
throw "Invalid character: \"" + char + "\"";
}
return index;
}
class Note {
constructor() {
this.string = "";
this.fret = "";
this.time = 0;
}
fromString(code) {
// sanity check
if (code.length != 3) {
throw "Invalid note code: \"" + code + "\""
}
// split three base64 chars and convert to ints
var noteInt = base64ToInt(code.charAt(0));
var measure = base64ToInt(code.charAt(1));
var tick = base64ToInt(code.charAt(2));
// bits 1-3 of the note int are the strings
this.string = "";
if (noteInt & 0x01) this.string = this.string + "1";
if (noteInt & 0x02) this.string = this.string + "2";
if (noteInt & 0x04) this.string = this.string + "3";
// bits 4-6 of the note int are the frets
this.fret = "";
if (noteInt & 0x08) this.fret = this.fret + "1";
if (noteInt & 0x10) this.fret = this.fret + "2";
if (noteInt & 0x20) this.fret = this.fret + "3";
// combine measure int and tick into into a single time, number of ticks from the beginning of the song
this.time = (measure * 64) + tick
return this;
}
desc() {
return "[" + this.time + " - " + this.string + ":" + this.fret + "]";
}
offsetTime(offset) {
// construct a new note with the same note value but an offset time
var n = new Note();
n.string = this.string;
n.fret = this.fret;
n.time = this.time + offset;
return n;
}
}
function noteTimeComparator(note1, note2) {
return note1.time - note2.time;
}
class Song {
constructor() {
this.scale = "";
this.notes = Array();
}
setScale(scale) {
this.scale = scale;
return this;
}
fromString(code) {
// should be 3n+1 chars long
if (code.length % 3 != 1) {
throw "Code is an invalid length"
}
// pull out the scale code and map it
var scaleCode = code.charAt(0);
this.scale = scale_map.get(scaleCode);
if (!this.scale) {
throw "Invalid scale code: \"" + scaleCode + "\""
}
// note array
this.notes = Array();
// pull out each three-char substring and parse it into a note string, fret, and time
for (var i = 1; i < code.length; i+= 3) {
this.notes.push(new Note().fromString(code.substring(i, i+3)));
}
// sort by time, should be unnecessary but there's nothing preventing anyone from
// building note lists out of order.
this.notes.sort(noteTimeComparator);
return this;
}
isEmpty() {
return this.notes.length == 0;
}
applyLeadIn(leadInLength, measureLength) {
var leadInOffset = measureLength - leadInLength;
if (leadInOffset < 0) {
throw "Lead in size cannot be more than one measure"
}
// iterate over all the notes
for (var i = 0; i < this.notes.length; i++) {
this.notes[i] = this.notes[i].offsetTime(leadInOffset);
}
return this;
}
split(intervalLength) {
// This is the meat of the whole thing
// we will build an array of sub-songs
var array = new Array();
// initial state, start before beginning
var intervalStart = -intervalLength;
// the start of the next interval
var intervalEnd = 0;
// loop over notes
// current sub-song, there isn't one yet
var subSong;
// iterate over all the notes
for (var i = 0; i < this.notes.length; i++) {
var note = this.notes[i];
// if the note's time is after our current interval, add sub-songs and increment the interval
// until we reach the right range
while (note.time >= intervalEnd) {
// create a new subSong and put it at the end of the array
// might as well copy the scale, too
subSong = new Song().setScale(this.scale);
array.push(subSong);
// increment the interval
intervalStart = intervalEnd;
intervalEnd = intervalStart + intervalLength;
}
// offset the note so that the interval start is time zero
subSong.notes.push(note.offsetTime(-intervalStart));
}
return array;
}
}
//==============================================================
// UI Builders
//==============================================================
function buildTabWithoutMeasures(song, title, author, secondsPerLine) {
var secondsPerLineFloat = parseFloat(secondsPerLine);
if (secondsPerLineFloat <= 0) {
throw "Invalid seconds per line: \"" + secondsPerLine + "\"";
}
// 16 ticks in a second
// round to the nearest tick
buildTab(song, title, author, Math.round(secondsPerLineFloat * 16));
}
function buildTabWithMeasures(song, title, author, meter, tempo, measuresPerLine, leadInBeats) {
// parse the tempo
var tempoInt = parseInt(tempo);
if (tempoInt <= 0) {
throw "Invalid tempo: \"" + secondsPerLine + "\"";
}
// 16 ticks in a second => ticks/minute * minutes/beat = ticks per beat
var ticksPerBeat = (16*60) / tempoInt;
// parse the meter
var regex = /(\d+)\/(\d+)/g;
var match = regex.exec(meter);
if (!match) {
throw "Invalid meter: \"" + s + "\"";
}
// pull out the numerator and denominator of the meter
// numerator = beats per measure
var beatsPerMeasure = parseInt(match[1]);
// denominator = the beat value
var beatValue = parseInt(match[2]);
if (beatsPerMeasure <= 0 || beatValue <= 0) {
throw "Invalid meter: \"" + meter + "\"";
}
// beatValue doesn't actually matter for our purposes. We don't have to worry about drawing eighth notes
// versus quarter notes. We have a tempo in beats per second, and all we care about is how many beats are
// in each measure
// measure length is a multiple of the beat length
var ticksPerMeasure = ticksPerBeat * beatsPerMeasure;
var measuresPerLineInt = parseInt(measuresPerLine);
if (measuresPerLineInt <= 0) {
throw "Invalid measures per line: \"" + measuresPerLineInt + "\"";
}
// line length is a multiple of the measure length
var ticksPerLine = ticksPerMeasure * measuresPerLineInt;
var leadInBeatsFloat = parseFloat(leadInBeats);
if (leadInBeatsFloat < 0) {
throw "Invalid lead in beats: \"" + leadInBeats + "\"";
}
var leadInTicks = Math.round(leadInBeatsFloat * ticksPerBeat);
// glad that's all out of the way
buildTab(song, title, author, ticksPerLine, ticksPerMeasure, ticksPerBeat, leadInTicks);
}
function parseInt(s) {
var i = Number.parseInt(s);
if (Number.isNaN(i)) {
throw "Invalid number: \"" + s + "\"";
}
return i;
}
function parseFloat(intString) {
// read a decimal from a string
var i = Number.parseFloat(intString);
if (Number.isNaN(i) || i < 0) {
throw "Invalid number: \"" + s + "\"";
}
return i;
}
function buildTab(song, title, author, lineBreaks, measureBreaks=0, beatBreaks=0, leadIn=0) {
// get the tab container
var tabArea = document.getElementById("tabArea")
// offset the song if lead-in was specified
// The Shawzin recorder always starts on the first note, even if that note isn't at the beginning of a measure
if (leadIn > 0) {
song = song.applyLeadIn(leadIn, measureBreaks);
}
// split the song up into sub-songs by lines
var lineSongs = song.split(lineBreaks);
// set a few constants for the image
// todo: pull these from CSS like I do with rngsim
var sideMargin = 15;
var topBottomMargin = 15;
var headerHeight = 60;
var footerHeight = 30;
var pageWidth = 1000;
var lineHeight = 60;
var fontSize = 15;
var lineSeparation = 60;
// these are calculated
var pageHeight = headerHeight + footerHeight + (lineHeight * lineSongs.length) + (lineSeparation * (lineSongs.length - 1)) + (topBottomMargin * 2);
var lineWidth = pageWidth - (sideMargin * 2);
// create a canvas element under the tab container with the dimensions we calculated
// if you configure something stupid like a thousand-line tab you're probably going to crash something.
tabArea.innerHTML = `<canvas class="tabCanvas" height=` + pageHeight + ` width=` + pageWidth + ` onclick="convertToPng(this);"/>`;
// find the canvas element we just added
var canvas = getFirstChild(tabArea, "tabCanvas");
// save the title to the canvas element for convertToPng() to pick up for a file name
canvas.saveName = title;
// get the graphics context, this is what we'll do all our work in
var context = canvas.getContext("2d");
// fill the whole canvas with a background color, otherwise it will be transparent
context.fillStyle = "#FFFFFF";
context.fillRect(0, 0, canvas.width, canvas.height);
// set the line color and width
context.strokeStyle = "#000000";
context.lineWidth = fontSize/10;
// set up the title text
context.font = (fontSize * 2) + "px Arial";
context.textAlign = "center";
context.fillStyle = "#000000";
// title
context.fillText(title, pageWidth/2, topBottomMargin + headerHeight * 0.3);
// set up the scale line
context.font = (fontSize * 1) + "px Arial";
context.textAlign = "left";
// scale line
context.fillText("Scale: " + song.scale, sideMargin*5, topBottomMargin + headerHeight * 0.75);
// set up the author line
context.font = (fontSize * 1) + "px Arial";
context.textAlign = "right";
// authorline
context.fillText(author, pageWidth - sideMargin*5, topBottomMargin + headerHeight * 0.75);
// set up the footer line
context.font = (fontSize * 1) + "px Arial";
context.textAlign = "right";
// footer line
context.fillText("https://buff0000n.github.io/shawzintab/", pageWidth - sideMargin, pageHeight - (topBottomMargin + footerHeight * 0.25));
// set up the rest of the text
context.font = fontSize + "px Arial";
context.textAlign = "center";
// iterate over the sub-songs
for (var line = 0; line < lineSongs.length; line++) {
// calculate the box coordinates containing the line
var x1 = sideMargin;
var x2 = x1 + lineWidth;
var y1 = topBottomMargin + headerHeight + ((lineHeight + lineSeparation) * line);
var y2 = y1 + lineHeight;
// draw the song line
buildSongLine(context, x1, y1, x2, y2, fontSize, lineSongs[line], lineBreaks, measureBreaks, beatBreaks)
}
}
function buildSongLine(context, x1, y1, x2, y3, fontSize, lineSong, lineBreaks, measureBreaks, beatBreaks) {
// margin around the start/end bars and measure bars if present
var barMargin = fontSize;
// calculate the middle string y-position
var y2 = (y1 + y3) / 2;
// we'll use this line width for pretty much everything
context.lineWidth = fontSize / 10;
// width for the string labels on the left
var labelWidth = fontSize * 1.5
// easier this way
x1 += labelWidth;
// draw 3 string lines
drawLine(context, x1, y1, x2, y1);
drawLine(context, x1, y2, x2, y2);
drawLine(context, x1, y3, x2, y3);
// string line labels
placeText(context, fontSize, stringThreeOnTop ? "3" : "1", x1-(fontSize*1), y1);
placeText(context, fontSize, "2", x1-(fontSize*1), y2);
placeText(context, fontSize, stringThreeOnTop ? "1" : "3", x1-(fontSize*1), y3);
if (measureBreaks != 0) {
// draw measure lines
for (var i = 0; i <= lineBreaks; i+= measureBreaks) {
var x3 = x1 + (((x2 - x1) * i) / lineBreaks);
drawLine(context, x3, y1, x3, y3);
}
// split up the line by measures
var measureSongs = lineSong.split(measureBreaks);
// clear space for all the notes first
function drawMeasure(clear) {
for (var m = 0; m < measureSongs.length; m++) {
var measureSong = measureSongs[m];
var x1b = x1 + (((x2 - x1) * (m * measureBreaks)) / lineBreaks);
var x2b = x1 + (((x2 - x1) * ((m + 1) * measureBreaks)) / lineBreaks);
drawNotes(context, x1b+barMargin, y1, x2b-barMargin, y3, y2, fontSize, measureSong, measureBreaks, clear);
}
}
drawMeasure(true);
drawMeasure(false);
} else {
// just put lines at the beginning and ending of each line
drawLine(context, x1, y1, x1, y3);
drawLine(context, x2, y1, x2, y3);
// clear space for all the notes first
drawNotes(context, x1+barMargin, y1, x2-barMargin, y3, y2, fontSize, lineSong, lineBreaks, true);
// now draw the notes
drawNotes(context, x1+barMargin, y1, x2-barMargin, y3, y2, fontSize, lineSong, lineBreaks, false);
}
// beat lines are too much clutter
/*
if (beatBreaks != 0) {
context.lineWidth = fontSize / 20;
var y1b = ((y1*2) + (y3*1)) / 3;
var y3b = ((y3*2) + (y1*1)) / 3;
for (var i = 0; i <= lineBreaks; i+= beatBreaks) {
var x3 = x1 + (((x2 - x1) * i) / lineBreaks);
drawLine(context, x3, y1b, x3, y3b);
}
}
*/
}
function drawNotes(context, x1, y1, x2, y3, y2, fontSize, drawSong, intervalLength, clear) {
context.textAlign = "center";
// fill color depends on whether we're clearing or drawing
if (clear) {
context.fillStyle = "#FFFFFF";
} else {
context.fillStyle = "#000000";
}
// iterate over the notes
for (var n = 0; n < drawSong.notes.length; n++) {
var note = drawSong.notes[n];
// use the notes time to calculate its x position in the line. The time is assumed to
// start at zero at the beginning of the line
// substract 1 from interval length to let barMargin take care of separating lines/measures
var x3 = x1 + (((x2 - x1) * note.time) / (intervalLength - 1));
// iterate over the note's strings
// do multi-string notes actually happen?
for (var j = 0; j < note.string.length; j++) {
var string = note.string.charAt(j);
// pick the y position for the correct string
var ty;
switch (string) {
case "1": ty = stringThreeOnTop ? y3 : y1; break;
case "2": ty = y2; break;
case "3": ty = stringThreeOnTop ? y1 : y3; break;
}
// if there's no frets then use "0"
var fret = (note.fret != "" ? note.fret : "0");
// clear space or draw the note
placeText(context, fontSize, fret, x3, ty, clear);
}
}
}
function placeText(context, fontSize, text, x3, ty, clear=false) {
// kludge to make it appear in the middle of the string line
// todo: how many browsers support context.measureText()?
ty += (fontSize*0.35);
var w = text.length * (fontSize * 0.8);
var h = fontSize;
if (clear) {
// clear a rectangle around the text
context.fillRect(x3-(w/2), ty-h, w, h*1.3);
} else {
// draw the text
context.fillText(text, x3, ty);
// if it's a multi-fret chord then underline it
if (text.length > 1) {
context.lineWidth = fontSize / 20;
drawLine(context, x3-(w/2), ty+(h*0.3), x3+(w/2), ty+(h*0.3))
}
}
}
function drawLine(context, x1, y1, x2, y2) {
// why is this so annoying
context.beginPath();
context.moveTo(x1, y1);
context.lineTo(x2, y2);
context.stroke();
}
function convertToPng(canvas) {
// quick and easy replace a canvas element with an equivalent image element for easy download
// builds a huuuuge URL with the base-64 encoded PNG data embedded inside it
var src = canvas.toDataURL();
// get the song name that was saved to the canvas element
var name = canvas.saveName;
// use a default if no name was specified
if (!name || name == "") {
name = "song";
}
var fileName = name + ".png";
// replace the canvas with an image
// Ugh, the only way to give it a file name is to wrap it in a link element, and duplicate the entire src contents.
canvas.parentElement.innerHTML = `
<a download="${fileName}" href="${src}">
<image src="${src}"></image>
</a>
`;
}
//==============================================================
// Utility DOM functions
// probably doing some of these the hard way but nothing else
// was reliable enough
// Most UI elements are identified by class instead of ID
// because they're added dynamically and there can be more than
// one of them in the DOM
//==============================================================
function getParent(node, parentClass) {
// walk up the DOM until we find a parent with the given class name or run out of parents
while (node != null && parentClass != (node.className)) {
node = node.parentNode;
}
return node;
}
function getFirstChild(node, childClass) {
// perform a depth first search from the first child to the last,
// until we find an element with the given class name
var children = node.children;
for (var i = 0; i < children.length; i++) {
var child = node.children[i];
if (child.className == childClass) {
return child;
}
// recursive call
var child2 = getFirstChild(child, childClass);
if (child2 !== null) {
return child2;
}
}
return null;
}
function getLastChild(node, childClass) {
// perform a depth first search going from the last child to the first,
// until we find an element with the given class name
var children = node.children;
// go over the children in reverse order
for (var i = children.length - 1; i >= 0; i--) {
var child = node.children[i];
if (child.className == childClass) {
return child;
}
// recursive call
var child2 = getLastChild(child, childClass);
if (child2 !== null) {
return child2;
}
}
return null;
}
function getAllChildren(node, childClass) {
// find all the children with the given class name
return getAllChildren0(node, childClass, Array());
}
function getAllChildren0(node, childClass, list) {
var children = node.children;
for (var i = 0; i < children.length; i++) {
var child = node.children[i];
if (child.className == childClass) {
list.push(child);
}
getAllChildren0(child, childClass, list);
}
return list;
}
function deleteNode(node) {
// delete an element from its parent
node.parentNode.removeChild(node);
}
//==============================================================
// misc UI
//==============================================================
function showErrors(errors) {
// find the error bar
var errorBarElement = document.getElementById("errorBar");
// build and error div with a line for each error in the list
var html = `<div id="error">`;
for (var error in errors) {
html += `<div class="errorLine">${errors[error]}</div>`;
}
html += `</div>`;
// show
errorBarElement.innerHTML = html;
}
function clearErrors() {
// find the error bar and clear it out
var errorBarElement = document.getElementById("errorBar");
errorBarElement.innerHTML = "";
}
function windowOnError(msg, url, lineNo, columnNo, error) {
showErrors([msg.replace("Uncaught ", "")]);
return false;
}