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index.html
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<!-- an attempt to create a simple browser REPL for oK. -->
<html>
<head><title>oK repl</title></head>
<style>
body {
background-color: gray;
font-smooth: never;
-webkit-font-smoothing : none;
font-family: "Monaco", monospace;
font-size: 9pt;
height: 100%;
width: 100%;
overflow: hidden;
}
a {
color: black;
}
#editor {
background-color: orange;
position: absolute;
top: 5%;
left: 50%;
width: 40%;
height: 90%;
}
textarea {
background-color: lightyellow;
font-smooth: never;
-webkit-font-smoothing : none;
font-family: "Monaco", monospace;
font-size: 9pt;
width: 100%;
height: 100%;
border: none;
border-left: 1px solid gray;
-moz-tab-size:4;
-o-tab-size:4;
tab-size:4;
}
#repl {
background-color: orange;
position: absolute;
display: table;
top:5%;
left:10%;
width:80%;
height:90%;
}
#scroll-w {
display: table-row;
height: 100%;
}
#scroll-h {
position: relative;
padding: 5px 5px 0 5px;
overflow-y: scroll;
background-color: lightgray;
height: 100%;
word-wrap: break-word;
word-break: break-all;
hyphens: none;
-moz-box-sizing: border-box;
}
#scroll {
position: absolute;
bottom: 0px;
max-height: 100%;
}
#prompt {
display: table-row;
background-color: black;
font-smooth: never;
-webkit-font-smoothing : none;
font-family: "Monaco", monospace;
font-size: 9pt;
color: white;
padding: 5px 0px 5px 20px;
margin: 0;
border: none;
bottom: 0px;
width: 100%;
height: 25px;
max-height: 25px;
overflow: hidden;
}
.err {
color: red;
background-color: pink;
display: none;
}
textarea:focus {
outline: none;
}
::-webkit-scrollbar {
display: none;
}
</style>
<body>
<div id="repl">
<div id="scroll-w"><div id="scroll-h"><div id="scroll"></div></div></div>
<div><textarea id="prompt" autocomplete="off"></textarea></div>
</div>
<div id="editor" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" style="display: none;">
<textarea id="textedit"></textarea>
</div>
</body>
<script src="oK.js"></script>
<script src="convert.js"></script>
<script>
document.getElementById("textedit").onkeydown = function(event) {
if (event.keyCode == 13 && event.shiftKey) {
saveBuffer();
if (this.selectionStart == this.selectionEnd) {
prompt.value = this.value;
}
else {
prompt.value = this.value.substring(this.selectionStart, this.selectionEnd);
}
processLine();
prompt.value = "";
printRepl("  ");
return false;
}
if (event.keyCode == 9) {
var text = this.value;
var start = this.selectionStart;
var end = this.selectionEnd;
this.value = text.substring(0, start) + '\t' + text.substring(end);
this.selectionStart = this.selectionEnd = start + 1;
saveBuffer();
return false;
}
saveBuffer();
};
function saveBuffer() {
localStorage.setItem("oKeditbuffer", document.getElementById("textedit").value);
}
function loadBuffer() {
var editbuffer = localStorage.getItem("oKeditbuffer");
if (!editbuffer) { editbuffer = "/ contents of this editor is automatically saved in local storage."; }
document.getElementById("textedit").value = editbuffer;
}
function printForm(x) {
return stok(format(x));
}
var env = baseEnv();
var entries = [];
var entryIndex = 0;
var partial = "";
var eid = 0;
setIO("0:", 2, print);
setIO("0:", 4, print);
setIO("0:", 1, readText);
setIO("1:", 1, readJSON);
setIO("5:", 0, printForm);
setIO("5:", 1, printForm);
var repl = document.getElementById("repl");
var scroll = document.getElementById("scroll");
var panel = document.getElementById("scroll-h");
var prompt = document.getElementById("prompt");
help = `oK has atom, list (2;\`c), dict \`a\`b!(2;\`c) and func {[x;y]x+y}
20 primitives/verbs, 6 operators/adverbs and 3 system functions
Verb (unary) Adverb Noun (null)
: gets ' each name \`a\`b \`
+ plus flip / over|join char "ab" " "
- minus negate \\ scan|split num 2 .3 0N(nan) 0w(inf)
* times first ': eachprior hex 0x2a2b
% divide sqrt /: eachright bool 01000b
! mod|map enum|key \\: eachleft
& min|and where
| max|or reverse System list (2;3.4;\`ab)
< less asc 0: url r/w(line) dict \`a\`b!(2;\`c)
> more desc 1: json r/w view f::32+1.8*c
= equal group 5: printable form func {[c]32+1.8*c}
~ match not
, concat enlist
^ fill|out null \\t x time
# take|rsh count \\e editor
_ drop|cut floor \\r run editor
$ cast|sum string $[c;t;f] COND \\v variables
? find|rnd distinct ?[x;I;[f;]y] insert \\f functions
@ at type @[x;i;[f;]y] amend \\c clear log
. dot eval|val .[x;i;[f;]y] dmend \\u make url
A manual of the oK language is available with more details:
https://github.com/JohnEarnest/ok/blob/gh-pages/docs/Manual.md
A more general introduction to array programming is also provided:
https://github.com/JohnEarnest/ok/blob/gh-pages/docs/Programming.md
`
prompt.focus();
prompt.onkeydown = processInput;
scroll.innerHTML =
"Welcome to <a href='https://github.com/JohnEarnest/ok' target='_blank'>oK</a> v"+version+
"<br>(inspired by <a href='http://kparc.com/k.txt' target='_blank'>K5</a>; \h for help)"+
"<br> ";
function escapeHTML(text) {
text += "";
text = text.replace(/&/g, "&");
text = text.replace(/</g, "<");
text = text.replace(/>/g, ">");
text = text.replace(/ /g, " ");
text = text.replace(/\r/g, "<font color='gray'>→</font>");
text = text.replace(/\n/g, "<br>");
return text;
}
function toggle(id) {
e = document.getElementById(id);
e.style.display = e.style.display == "none" ? "inline" : "none";
}
function processInput(e) {
if (e.keyCode == 38) {
if (entries.length == 0) { return false; }
if (entryIndex > 0) {
entryIndex--;
prompt.value = entries[entryIndex];
}
return false;
}
if (e.keyCode == 40) {
if (entries.length == 0 || entryIndex >= entries.length-1) {
entryIndex = entries.length;
prompt.value = "";
return false;
}
entryIndex++;
prompt.value = entries[entryIndex];
return false;
}
if (e.keyCode != 13) { return; }
printReplBare("<font color='gray'>"+escapeHTML(prompt.value)+"</font>");
if (prompt.value != "") { processLine(); }
if (prompt.value != "") { entries.push(prompt.value); }
entryIndex = entries.length;
prompt.value = "";
printRepl(partial == "" ? "  " : "> ");
return false;
}
function printEnv(filter, label) {
var found = {};
var len = 0;
for (var z = 0; z < env.d.k.v.length; z++) {
var key = env.d.k.v[z].v
var val = env.d.v.v[z]
if (filter(val)) {
len = Math.max(key.length, len)
found[key] = format(val)
}
}
for(var name in found) {
var n = name; for(var x=(len+1 - n.length); x>0; x--) { n += " "; }
printRepl(n + ": " + found[name]);
}
if (len == 0) {
printRepl("no "+label+" defined.");
}
printRepl("");
}
function processLine() {
if (prompt.value == "\\\\") { partial = ""; return; }
if (prompt.value == "\\e") {
var editor = document.getElementById("editor");
if (editor.style.display == "inline") {
editor.style.display = "none";
repl.style.width = "80%";
saveBuffer();
}
else {
editor.style.display = "inline";
repl.style.width = "40%";
loadBuffer();
document.getElementById("textedit").focus();
}
return;
}
if (prompt.value == "\\r") {
saveBuffer();
prompt.value = document.getElementById("textedit").value;
}
if (prompt.value == "\\c") {
scroll.innerHTML = "";
panel.scrollTop = panel.scrollHeight;
return;
}
if (prompt.value == "\\f") {
printEnv(function(v) { return v.t >= 5 && v.t != 13; }, "functions");
return;
}
if (prompt.value == "\\v") {
printEnv(function(v) { return v.t < 5; }, "variables");
return;
}
if (prompt.value == "\\h") {
printRepl(escapeHTML(help));
return;
}
if (prompt.value == "kOS") { printRepl("one system/all devices"); return; }
if (prompt.value.lastIndexOf("\\u") == 0) {
var code = prompt.value.slice(2);
var enc = encodeURIComponent(code).replace(/[!'()*]/g, function(c) {
return '%' + c.charCodeAt(0).toString(16);
});
var url = document.location + "?run=" + enc;
printRepl("oK code url:");
printRepl("<a href=\""+url+"\" target='_blank'>"+url+"</a>");
return;
}
var showtime = false;
if (prompt.value.lastIndexOf("\\t") == 0) {
prompt.value = prompt.value.slice(2);
showtime = true;
}
var parsed = null;
try { parsed = parse(" " + partial + "; " + prompt.value); }
catch(error) {
if (done() && (
error.message == "parse error. '}' expected." ||
error.message == "parse error. ')' expected." ||
error.message == "parse error. ']' expected.")) {
partial += ((partial!="")?";":"") + prompt.value;
return;
}
else {
printRepl("<font color='red'>"+error.message+"</font>");
partial = "";
return;
}
}
partial = "";
try {
var starttime = new Date().getTime();
printRepl(escapeHTML(format(run(parsed, env))));
if (showtime) {
var endtime = new Date().getTime();
printRepl("completed in "+(endtime-starttime)+"ms.");
}
}
catch(error) {
printRepl(
"<span style='color: red; cursor:pointer;' onclick='toggle(\"e"+(eid)+"\")'>"+error.message+
"<div class='err' id='e"+(eid++)+"'><br>"+escapeHTML(error.stack)+"</div></span>"
);
}
}
function printReplBare(x) {
scroll.innerHTML += x;
panel.scrollTop = panel.scrollHeight;
}
function printRepl(x) {
printReplBare("<br>");
printReplBare(x);
}
function print(x, y) {
// todo: use x to select a file descriptor
try {
var t = tojs(y);
if (typeof t == "string") { printRepl(escapeHTML(t)); return y; }
if (Array.isArray(t) && t.every(function(v) { return typeof v == "string"; })) {
t.map(function(v) { printRepl(escapeHTML(v)); }); return y;
}
}
catch(e) {}
throw new Error("0: can only display strings or lists of strings.");
}
function readAjax(x) {
var url = tojs(x);
if (typeof url != 'string') { throw new Error("string expected."); }
var request = new XMLHttpRequest();
request.open('GET', url, false);
request.send(null);
return [request.status, request.responseText];
}
function readText(x) { return tok(readAjax(x)); }
function readJSON(x) {
var t = readAjax(x);
t[1] = JSON.parse(t[1]);
return tok(t);
}
var urlstring = location.search.match(/run=([a-zA-Z0-9-_.!~*'()%]+)/);
if (urlstring) {
var code = decodeURIComponent(urlstring[1]).trim();
printRepl("from url ");
prompt.value = code;
processInput({keyCode:13});
}
</script>
</html>