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generator.html
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generator.html
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<!doctype html>
<title>Railroad Diagram Generator</title>
<link href="railroad.css" rel=stylesheet>
<textarea class='input'>Diagram(
Optional('+', 'skip'),
Choice(0,
NonTerminal('name-start char'),
NonTerminal('escape')),
ZeroOrMore(
Choice(0,
NonTerminal('name char'),
NonTerminal('escape'))))</textarea>
<div class='output-image'></div>
<textarea class='output-text' readonly></textarea>
<ul class=info>
<li><label><input type=number min=1 value=8 width=3 id=option-vs> Minimum vertical separation between lines (in px)?</label>
<li><label><input type=number min=2 value=10 id=option-ar> Arc radius for corners (in px)?</label>
<li><label><input type=number min=1 value=8.5 step=.5 id=option-char-width> Average width of characters in "normal" (Terminal/NonTerminal) text (in px)?</label>
<li><label><input type=number min=1 value=7 step=.5 id=option-comment-width> Average width of characters in Comment text (in px)?</label>
<li><label>
<select id=option-alignment>
<option>center</option>
<option>left</option>
<option>right</option>
</select>
How should items be aligned when there's more space than they need?</label>
<li><label><input type=checkbox id=option-odd-stroke checked> Is the stroke width an odd number of px? (Yes, in the default styles.)
<li><label><input type=checkbox name=standalone id=option-standalone> Generate code for standalone SVG document?</label>
</ul>
<script type=module>
import rr, * as rrClass from "./railroad.js";
Object.assign(window, rr);
window.rrOptions = rrClass.Options;
console.log(rr);
const find = document.querySelector.bind(document);
find('.input').addEventListener('input', e=>process(e.target.value), false);
document.addEventListener('DOMContentLoaded', initialProcess, false);
window.addEventListener('hashchange', hashProcess, false);
find('.info').addEventListener('input', _=>process(), false);
function initialProcess() {
if(location.hash && location.hash.length > 1) {
const code = decodeURIComponent(location.hash.substr(1));
const input = find('.input');
input.textContent = code;
}
process();
}
function hashProcess() {
if(location.hash && location.hash.length > 1) {
const code = decodeURIComponent(location.hash.substr(1));
const input = find('.input');
if(input.value != code) {
input.textContent = code;
process(code);
}
}
}
function process(input) {
if(!input) input = find('.input').value;
const standalone = find('#option-standalone').checked;
rrOptions.VS = parseInt(find("#option-vs").value, 10);
rrOptions.AR = parseInt(find("#option-ar").value, 10);
rrOptions.STROKE_ODD_PIXEL_LENGTH = find("#option-odd-stroke").checked;
rrOptions.CHAR_WIDTH = parseInt(find("#option-char-width").value, 10);
rrOptions.COMMENT_CHAR_WIDTH = parseInt(find("#option-comment-width").value, 10);
rrOptions.INTERNAL_ALIGNMENT = find("#option-alignment").value;
try {
var result = eval(input).format();
location.hash = "#" + encodeURIComponent(input);
} catch (e) {
find('.output-text').textContent = "Invalid input.\n" + e
throw e;
}
find('.output-image').innerHTML = '';
result.addTo(find('.output-image'));
find('.output-text').textContent = standalone ? result.toStandalone() : result.toString();
console.log(result);
}
</script>
<style>
@media all and (min-width: 400px) {
html, body { margin: 0; padding: 0; height: 100%; }
body {
display: grid;
grid-template:
"input code" 1fr
"output info" 1fr
/ auto minmax(15em, auto);
max-width: 100%;
}
}
.input {
grid-area: input;
}
.output-text {
grid-area: code;
}
.output-image {
grid-area: output;
overflow: auto;
}
.info {
grid-area: info;
}
.info input[type=number], .info select {
width: 60px;
box-sizing: border-box;
}
</style>