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editor.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Online Editor</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<img id="gizmoLogo" height="170px" width="550px" src="https://user-images.githubusercontent.com/76635411/117458638-7f045b80-af18-11eb-8bbe-33fb328ea454.png">
<div id="nav-bar">
<a class="tab" href="index.html">The Gizmo Programming Language</a>
<a class="tab" href="docs.html">Documentation</a>
<a class="tab" href="install.html">Install</a>
<a class="tab" href="editor.html">Playground</a>
<a class="tab" href="https://github.com/ellder054/gizmo-lang/">Repository</a>
</div>
<br>
<br>
<button class="mini">Run</button><group id="tabs"><button onclick="select('main.gizmo');" class="tab-editor">main.gizmo</button></group><button onclick="newTab();" class="mini">+</button><br/>
<div class="container">
<div class="backdrop">
<div id="front" class="front" spellcheck="false"><code>write("Hello, World");</code></div>
</div>
<textarea spellcheck="false" id="editor">write("Hello, World");</textarea>
<select name="mode" id="mode">
<option selected>Gizmo</option>
<option>Dark</option>
<option>Light</option>
</select>
</div>
<script>var number = 1;
var selected = "main.gizmo";
var mode = "Gizmo";
var ed = document.getElementById("front");
var text = document.getElementById("editor");
var backdrop = document.querySelector(".backdrop");
var modeSelect = document.getElementById("mode");
let found_opening_brace = false;
text.focus();
resetColors();
var tab_values = {
"main.gizmo": "",
};
// syntax highlighting
function isDigit(c) {
return c >= '0' && c <= '9';
}
function isAlpha(c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c === '_';
}
function lex(code, curr_lineno) {
let block_c = 0;
let block_begins = [];
let lineno = 1;
let never_count_again = false;
let block_ends = [];
const operators = ["+", "-", "*", "/", "="];
let html = "";
let pos = 0;
//console.log("----------------------------");
//console.log("Cursor is at line " + count_to_lineno(getCaretPosition(text)));
found_opening_brace = false;
while (pos < code.length) {
let c = code[pos];
if (isDigit(c)) {
let num = "";
while (isDigit(c)) {
num += c;
c = code[++pos];
}
html += "<span class=\"num-" + mode + "\">" + num + "</span>";
} else if (c === '"' || c === "'") {
let str = "";
let delimiter = c;
let found = false;
c = code[++pos];
while (pos < code.length) {
if (c === delimiter) {
found = true;
break;
}
str += c;
c = code[++pos];
}
c = code[++pos];
if (found) {
html += "<span class=\"str-" + mode + "\">" + delimiter + str + delimiter + "</span>";
} else {
html += "<span class=\"str-" + mode + "\">" + delimiter + str + "</span>";
}
} else if (isAlpha(c)) {
let name = "";
while (isAlpha(c) || isDigit(c)) {
name += c;
c = code[++pos];
}
const keys = ["write", "if", "else", "return", "while", "class", "read", "for", "or", "and", "not", "include", "from", "true", "false"];
const difkeys = ['this', 'init', 'in', 'new', 'con'];
const types = ["int", "string", "char"]
if (keys.includes(name)) {
html += "<span class=\"key-" + mode + "\">" + name + "</span>";
} else if (difkeys.includes(name)) {
html += "<span class=\"dif-key-" + mode + "\">" + name + "</span>";
} else if (types.includes(name)) {
html += "<span class=\"type-" + mode + "\">" + name + "</span>";
} else {
html += "<span>" + name + "</span>";
}
} else if (operators.includes(c)) {
html += "<span class=\"oper-" + mode + "\">" + c + "</span>";
pos++;
} else if (c === '.') {
let property = ".";
c = code[++pos];
while (isAlpha(c) || isDigit(c)) {
property += c;
c = code[++pos];
}
html += "<span class=\"property-" + mode + "\">" + property + "</span>";
} else if (c === '\\') {
let comment = "\\";
c = code[++pos];
while (pos < code.length) {
if (c === '\n') {
break;
}
comment += c;
c = code[++pos];
}
html += "<span class=\"com-" + mode + "\">" + comment + "</span>";
} else if (c === '{') {
found_opening_brace = true;
//console.log("found { at lineno " + lineno + " block_c " + block_c);
if (!never_count_again && (lineno > count_to_lineno(getCaretPosition(text)))) {
never_count_again = true;
//console.log("{ surpassed lineno " + lineno + " block_c " + block_c);
}
pos++;
if (never_count_again) {
html += '{';
continue;
}
block_c++;
html += '{';
block_begins.push(pos);
} else if (c === '}') {
//console.log("found } at lineno " + lineno + " block_c " + block_c);
if (!never_count_again && (lineno >= count_to_lineno(getCaretPosition(text)))) {
never_count_again = true;
//console.log("} surpassed lineno " + lineno + " block_c " + block_c);
}
pos++;
if (never_count_again) {
html += '}';
continue;
}
block_c--;
html += '}';
block_ends.push(pos);
} else if (c === '\n') {
lineno++;
html += '\n';
pos++;
} else {
html += c;
pos++;
}
}
return {
h: html,
bb: block_begins,
be: block_ends,
bc: block_c,
};
}
function count_to_lineno(pos) {
let i = 0;
let lineno = 1;
for (const c of text.value) {
if (c === '\n') {
lineno++;
}
if (i >= pos) {
break;
}
i++;
}
return lineno;
}
function applyColors(text) {
return lex(text);
}
// tab control
function newTab() {
if (selected === "main.gizmo") {
tab_values["main.gizmo"] = ed.innerText
}
tabs.innerHTML += "<span><button class=\"tab-editor\" onclick=\"select(this.innerText);\">Untitled" + number + ".gizmo</button><button class=\"mini\" onclick=\"ed.innerText = tab_values['main.gizmo'];text.value = tab_values['main.gizmo'];delete tab_values[this.parentNode.childNodes[0].value];select('main.gizmo');this.parentNode.childNodes[0].remove();this.parentNode.remove();this.remove();\">x</button></span>";
for (const tab of document.getElementsByClassName("tab")) {
tab.style.backgroundColor = bgs[modeSelect.value];
tab.style.color = fgs[modeSelect.value];
}
for (const min of document.getElementsByClassName("mini")) {
min.style.backgroundColor = bgs[modeSelect.value];
min.style.color = fgs[modeSelect.value];
}
modeSelect.style.backgroundColor = bgs[mode];
tab_values["Untitled" + number + ".gizmo"] = "";
selected = "Untitled" + number + ".gizmo";
ed.innerText = tab_values[selected];
ed.innerHTML = "<code>" + ed.innerText + "</code>";
text.value = tab_values[selected];
number++;
}
function select(v) {
if (selected === v) {
text.focus();
return;
}
tab_values[selected] = ed.innerText;
selected = v;
text.value = tab_values[selected];
text.focus();
resetColors();
}
// on changed input
text.addEventListener("input", function () {
resetColors();
});
// matching pairs
function getCaretPosition(ctrl) {
// IE < 9 Support
if (document.selection) {
ctrl.focus();
var range = document.selection.createRange();
var rangelen = range.text.length;
range.moveStart('character', -ctrl.value.length);
var start = range.text.length - rangelen;
return start;
} // IE >=9 and other browsers
else if (ctrl.selectionStart || ctrl.selectionStart == '0') {
return ctrl.selectionStart;
} else {
return 0;
}
}
function insert(pos, c) {
text.value = text.value.slice(0, pos) + c + text.value.slice(pos);
}
function un_insert(pos, c1, c2) {
if (text.value[pos - 1] === c1 && text.value[pos] === c2) {
text.value = text.value.slice(0, pos - 1) + text.value.slice(pos);
setCaretPosition(text, pos, pos);
}
}
function setCaretPosition(ctrl, start, end) {
if (ctrl.setSelectionRange) {
ctrl.focus();
ctrl.setSelectionRange(start, end);
}
else if (ctrl.createTextRange) {
var range = ctrl.createTextRange();
range.collapse(true);
range.moveEnd('character', end);
range.moveStart('character', start);
range.select();
}
}
function resetColors() {
let s = applyColors(text.value).h.split("\n");
let code = "";
for (const line of s) {
if (line === "") {
code += "<code>\n</code>";
} else {
code += "<code>" + line + "</code>";
}
}
ed.innerHTML = code;
}
text.addEventListener("keydown", function (e) {
const pairs = {
'[': ']',
'(': ')',
'"': '"',
"'": "'",
}
if (Object.keys(pairs).includes(e.key)) {
const pos = getCaretPosition(text);
insert(pos, pairs[e.key]);
setCaretPosition(text, pos, pos);
resetColors();
} else if (Object.values(pairs).includes(e.key)) {
const pos = getCaretPosition(text);
if (text.value[pos] === e.key) {
e.preventDefault();
}
setCaretPosition(text, pos + 1, pos + 1);
resetColors();
} else if (e.which === 9) {
e.preventDefault();
const pos = getCaretPosition(text);
insert(pos, " ")
setCaretPosition(text, pos + 3, pos + 3);
resetColors();
} else if (e.which === 8) {
const pos = getCaretPosition(text);
if (Object.keys(pairs).includes(text.value[pos - 1])) {
un_insert(pos, text.value[pos - 1], pairs[text.value[pos - 1]]);
resetColors();
}
} else if (e.which === 13) {
const pos = getCaretPosition(text);
let block_c = find_block_c(pos);
if (block_c > 0) {
insert(pos, "\n" + " ".repeat(block_c));
setCaretPosition(text, pos + 1 + 3 * block_c, pos + 1 + 3 * block_c);
resetColors();
e.preventDefault();
}
}
});
function* enumerate(array) {
for (let i = 0; i < array.length; i += 1) {
yield [i, array[i]];
}
}
function find_block_c(pos) {
let blocks = lex(text.value);
for (const pair of enumerate(blocks.bb)) {
if (pos >= pair[1]) {
return blocks.bc;
}
}
return false;
}
// scroll
text.addEventListener("scroll", function () {
backdrop.scrollTop = text.scrollTop;
ed.scrollTop = text.scrollTop;
});
// on changed input
const bgs = {
"Gizmo": "#22272E",
"Dark": "#000000",
"Light": "#EEEEEE",
}
const fgs = {
"Gizmo": "#F8F8F8",
"Dark": "#FFFFFF",
"Light": "#000000",
}
modeSelect.addEventListener("input", function () {
mode = modeSelect.value;
for (const tab of document.getElementsByClassName("tab-editor")) {
tab.style.backgroundColor = bgs[mode];
tab.style.color = fgs[mode];
}
for (const min of document.getElementsByClassName("mini")) {
min.style.backgroundColor = bgs[mode];
min.style.color = fgs[mode];
}
modeSelect.style.backgroundColor = bgs[mode];
modeSelect.style.color = fgs[mode];
ed.style.backgroundColor = bgs[mode];
ed.style.color = fgs[mode];
let s = applyColors(text.value).h.split("\n");
let code = "";
for (const line of s) {
if (line === "") {
code += "<code>\n</code>";
} else {
code += "<code>" + line + "</code>";
}
}
ed.innerHTML = code;
});</script>
</body>
</html>