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pith-ception.html
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<!doctype html>
<html>
<head>
<title>Pith</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="initial-scale=1.0, minimum-scale=0.25">
<meta name="author" content="Gabriel Sroka">
<meta name="copyright" content="Copyright 2007-2022 Gabriel Sroka">
<style>
body {
font-family: sans-serif;
}
a {
color: black;
text-decoration: none;
}
@media (prefers-color-scheme: dark) {
*, a {
background-color: #121212;
color: #ddd;
}
}
@media (orientation: landscape) and (max-width: 865px) {
* {
font-size: 0.8em;
}
}
</style>
</head>
<body>
<a href=https://github.com/gabrielsroka/gabrielsroka.github.io/blob/master/webpages/pith.html target=_blank>Pith</a>
<a href=https://github.com/gabrielsroka/gabrielsroka.github.io/blob/master/pith.js target=_blank>.js</a>
<button id=runProgram accesskey="R" title="Run (Ctrl + Enter)">Run</button>
<button id=newProgram accesskey="N" title="New">New</button>
<button id=saveProgram accesskey="S" title="Save">Save</button>
<select id=prognames></select>
<span id=bar></span>
<br><br>
<textarea id="editor" style="width: 99%;" cols="80" rows="16" spellcheck="false" autocapitalize="none"></textarea>
<textarea id="debug" style="width: 99%;" cols="80" rows="12" spellcheck="false" autocapitalize="none"></textarea>
<div id=results></div>
<script>
var programs;
var progname;
var tab = 2;
if (localStorage.pithPrograms) {
load();
} else {
programs = {};
editor.value = `max = 6
ids = await getApi('/topstories')
ids.slice(0, max).forEach(getItem)
async def getItem(id)
item = await getApi('/item/' + id)
? item.title, '|', item.score, 'pts'
u = '//news.ycombinator.com/item?id='
> item.title.link(u + id) + '<br>'
async def getApi(path)
u = '//hacker-news.firebaseio.com/v0'
return getJson(u + path + '.json')`;
progname = 'Hello HN';
addOption(progname, editor.value);
save();
}
if (!navigator.userAgent.match("Android")) {
runProgram.innerHTML = '<u>R</u>un';
newProgram.innerHTML = '<u>N</u>ew';
saveProgram.innerHTML = '<u>S</u>ave';
}
runProgram.onclick = function () {
save();
debug.clear();
console.clear();
run(editor.value);
};
newProgram.onclick = function () {
const n = prompt("Program name");
if (!n) return;
progname = n;
addOption(progname, '');
prognames.selectedIndex = prognames.options.length - 1;
editor.value = "";
debug.clear();
};
saveProgram.onclick = save;
prognames.onchange = function () {
editor.value = this.value;
progname = this.options[this.selectedIndex].text;
debug.clear();
};
editor.focus();
editor.onkeydown = function (event) {
const ENTER = 13;
if (event.ctrlKey && event.keyCode == ENTER) {
runProgram.onclick();
} else {
saveProgram.innerHTML = 'Save *';
}
};
debug.log = debug.print = function (s) {
debug.value += (s ? s.toString() : s) + '\n';
debug.scrollTo(0, debug.scrollHeight);
};
debug.clear = function () {
debug.value = '';
results.innerHTML = '<table id=table><thead></thead><tbody></tbody></table>';
};
debug.show = function () {
debug.visible = true;
debug.style.display = '';
};
debug.hide = function () {
debug.visible = false;
debug.style.display = 'none';
};
debug.toggle = function () {
debug.visible ? debug.hide() : debug.show();
};
debug.visible = true;
function print(...args) {
debug.print(args.join(' '));
}
function button(html, onclick) {
return `<button onclick=${onclick}>${html}</button>`;
}
results.html = bar.html = function (s) {
if (s == undefined) {
return this.innerHTML;
} else {
this.innerHTML = s;
}
};
function save() {
if (editor.value) {
programs[progname] = editor.value;
prognames.options[prognames.selectedIndex].value = editor.value;
} else {
delete programs[progname];
prognames.options.remove(prognames.selectedIndex);
}
localStorage.pithPrograms = JSON.stringify(programs);
saveProgram.innerHTML = 'Save';
}
function load() {
programs = JSON.parse(localStorage.pithPrograms);
for (const [progname, value] of Object.entries(programs)) {
if (value) addOption(progname, value);
}
editor.value = Object.values(programs)[0];
progname = Object.keys(programs)[0];
}
function addOption(name, value) {
const option = document.createElement('option');
option.text = name;
option.value = value;
prognames.add(option);
}
</script>
<script>
var tab;
// Mini-Pith for bootstrapping.
function boot(lines) {
lines = lines.split('\n');
var ind = 0;
for (var i = 0; i < lines.length; i++) {
var line = lines[i];
const tLine = line.trim();
if (tLine.startsWith('for ')) {
line = line.replace('for', 'for (var').replace(' in ', ' of ') + ')';
} else if (tLine.startsWith('while ')) {
line = line.replace('while ', 'while (') + ')';
} else if (tLine.startsWith('def ') || tLine.startsWith('async def ')) {
line = line.replace('def', 'function');
} else if (tLine.startsWith('if ') || tLine.startsWith('else if ')) {
line = line.replace('if ', 'if (').replace(' = ', ' == ') + ')';
}
var newInd = line.match(/^( *)/)[1].length / tab;
for (var t = newInd; t < ind; t++) {
line = ' '.repeat(tab * t) + '}\n' + line;
}
if (newInd > ind) lines[i - 1] += ' {';
ind = newInd;
lines[i] = line;
}
lines = lines.join('\n');
eval(lines);
}
// Bootstrap the Pith run function and std lib using JS Mini-Pith boot function.
tab = 4;
boot(`
run =
def (lines)
const nl = '\\n'
lines = lines.split(nl)
var ind = 0
for i in range(lines.length)
var line = lines[i]
const tLine = line.trim()
if tLine.startsWith('for ')
line = line.replace('for', 'for (var').replace(' in ', ' of ') + ')'
else if tLine.startsWith('while ')
line = line.replace('while ', 'while (') + ')'
else if tLine.startsWith('def ') || tLine.startsWith('async def ')
if line.endsWith(' main')
line = 'main()' + nl + line
line = line.replace('def', 'function')
if !line.endsWith(')')
line += '()'
else if tLine.startsWith('if ') || tLine.startsWith('else if ') || tLine.startsWith('elif ')
line = line.replace('elif', 'else if').replace('if ', 'if (').replace(' = ', ' == ') + ')'
else if tLine.startsWith('#')
line = line.replace('#', '//')
else if tLine.startsWith('print ') || tLine.startsWith('?')
line = line.replace(/(print|\\?) ?/, 'print(') + ')'
else if tLine.startsWith('>')
line = line.replace('>', 'results.innerHTML +=') + " + '<br>'"
else if tLine.startsWith('|')
line = line.replace('|', 'table.tHead.innerHTML += "<tr><th>" +')
else if tLine.startsWith('+')
line = line.replace('+', 'table.tBodies[0].innerHTML += "<tr><td>" +')
else if tLine.startsWith('tab = ')
eval(line)
line = '// ' + line
var newInd = line.match(/^( *)/)[1].length / tab
for t in range(newInd, ind)
line = ' '.repeat(tab * t) + '}' + nl + line
if newInd > ind
lines[i - 1] += ' {'
ind = newInd
lines[i] = line
lines = '(async function () {' + nl + lines.join(nl) + (nl + '}').repeat(ind) + nl + '})()'
console.log(lines)
eval(lines)
range =
def * (start, stop, step = 1)
if stop = undefined
stop = start
start = 0
while start < stop
yield start
start += step
ac =
def (it, cond, fn)
return [...gen(it, cond, fn)]
gen =
def * (it, cond, fn)
for n in it
if cond = undefined || cond(n)
yield fn ? fn(n) : n
sum =
def (it)
var total = 0
for n in it
total += n
return total
getJson =
async def (url, init)
const r = await fetch(url, init)
return r.json()
`);
tab = 2;
const get = fetch;
document.querySelectorAll('script[type="text/pith"]').forEach(s => run(s.innerText));
</script>
</body>
</html>