265 lines
10 KiB
JavaScript
265 lines
10 KiB
JavaScript
// Kyler Olsen
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// November 2023
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class PythonEditor{
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constructor(ele) {
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this.element = ele;
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this.element.addEventListener("input", this.textInput.bind(this));
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this.element.addEventListener("keydown", this.handleKeyDown.bind(this));
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this.view_code = document.createElement("code");
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this.edit_code = document.createElement("code");
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this.view_pre = document.createElement("pre");
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this.edit_pre = document.createElement("pre");
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this.edit_code.contentEditable = true;
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this.edit_code.spellcheck = false;
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this.view_pre.classList.add("view-code");
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this.edit_pre.classList.add("edit-code");
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this.view_pre.appendChild(this.view_code);
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this.edit_pre.appendChild(this.edit_code);
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this.element.appendChild(this.view_pre);
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this.element.appendChild(this.edit_pre);
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}
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textInput(e) {
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let text = this.edit_code.innerText;
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this.view_code.innerHTML = "";
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syntax_highlight_html(text).forEach(ele => this.view_code.appendChild(ele));
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}
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handleKeyDown(e) {
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if (e.key === "Tab") {
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e.preventDefault();
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insertTab(e.target);
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}
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}
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}
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function insertTab() {
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const selection = window.getSelection();
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if (selection.rangeCount > 0) {
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const range = selection.getRangeAt(0);
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const startOffset = range.startOffset;
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const lineStart = range.startContainer.textContent.lastIndexOf('\n', startOffset - 1) + 1;
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const spacesToAdd = 4 - ((startOffset - lineStart) % 4);
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const tabSpaces = ' '.repeat(spacesToAdd);
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const tabNode = document.createTextNode(tabSpaces);
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range.deleteContents();
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range.insertNode(tabNode);
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range.setStartAfter(tabNode);
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range.setEndAfter(tabNode);
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selection.removeAllRanges();
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selection.addRange(range);
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}
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}
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function syntax_highlight(text) {
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const whitespace = " \n\t";
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const string_start = `'"`;
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const string_alt_start = [
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`r'`, `r"`, `rf`, `rb`, `rF`, `rB`,
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`R'`, `R"`, `Rf`, `Rb`, `RF`, `RB`,
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`f'`, `f"`, `fr`, `fR`,
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`F'`, `F"`, `Fr`, `FR`,
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`b'`, `b"`, `br`, `bR`,
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`B'`, `B"`, `Br`, `BR`,
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];
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const number_start = "0123456789.";
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const number_second = "0123456789bBeEjJ0OxX._";
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const number_dec_start = "123456789.";
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const number_dec_continue = "0123456789._";
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const number_bin_start = ["0b", "0B"];
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const number_bin_continue = "01_";
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const number_oct_start = ["0o", "0O"];
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const number_oct_continue = "01234567_";
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const number_hex_start = ["0x", "0X"];
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const number_hex_continue = "0123456789abcdefABCEDF_";
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const number_exp_start = "eE";
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const number_exp_second = "+-0123456789";
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const number_exp_continue = "0123456789_";
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const tokens = [];
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var char = text.substr(0, 1); text = text.substr(1);
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while (text.length) {
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const token = {'token_type': '', 'value':''};
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// Whitespace
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if (whitespace.includes(char)) {
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token.token_type = "whitespace";
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while (text.length && whitespace.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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// Comments
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else if (char == '#') {
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token.token_type = "comment";
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while (text.length && char != "\n") {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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// String literals
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else if (string_start.includes(char) || (string_alt_start.includes(char + text.substr(0, 1)))) {
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var depth = 1;
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var start;
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if (string_start.includes(char)) {
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token.token_type = "string";
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start = char;
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} else {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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if (!string_start.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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if (token.value.includes('r') || token.value.includes('R'))
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token.token_type += "raw-";
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if (token.value.includes('f') || token.value.includes('F'))
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token.token_type += "f-";
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if (token.value.includes('b') || token.value.includes('B'))
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token.token_type += "byte-";
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token.token_type += "string";
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start = char;
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}
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if (text.substr(0, 1) == start && text.substr(1, 1) == start) depth = 3;
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && depth && (depth > 1 || char != '\n')) {
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token.value += char;
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if (char == start && depth == 1) depth--;
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else if (char == start && text.substr(0, 1) == start && depth == 2) depth--;
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else if (char == start && text.substr(0, 1) == start && text.substr(1, 1) == start && depth == 3) depth--;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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// Number literals
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else if (number_start.includes(char)) {
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token.token_type = "number";
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if (number_dec_start.includes(char)) {
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while (text.length && number_dec_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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if (number_exp_start.includes(char) && number_exp_second.includes(text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && number_exp_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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if ("jJ".includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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} else if (number_bin_start.includes(char + text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && number_bin_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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} else if (number_oct_start.includes(char + text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && number_oct_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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} else if (number_hex_start.includes(char + text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && number_hex_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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} else if (char == 0 && "eE".includes(text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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if (number_exp_start.includes(char) && number_exp_second.includes(text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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while (text.length && number_exp_continue.includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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if ("jJ".includes(char)) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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} else if (char == 0 && !number_second.includes(text.substr(0, 1))) {
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token.value += char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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}
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else {
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token.token_type = "token";
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token.value = char;
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char = text.substr(0, 1); text = text.substr(1);
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}
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tokens.push(token);
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tokens.push({'token_type': 'sep', 'value':'·'});
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}
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return tokens;
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}
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function syntax_highlight_html(text) {
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const tokens = syntax_highlight(text);
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const elements = [];
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var last = "whitespace";
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tokens.forEach(token => {
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const element = document.createElement("span");
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if (token.token_type == "whitespace")
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element.classList.add("whitespace");
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else if (token.token_type == "comment")
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element.classList.add("comment");
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else if (token.token_type.substr(-6) == "string") {
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element.classList.add("literal");
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element.classList.add("string");
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} else if (token.token_type == "number") {
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element.classList.add("literal");
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element.classList.add("number");
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} else if (token.token_type == "sep")
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element.classList.add("token-sep");
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else
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element.classList.add("token");
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element.innerText = token.value;
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elements.push(element);
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last = token.token_type;
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})
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return elements;
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}
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document.addEventListener('DOMContentLoaded', () => {
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document.querySelectorAll(".code").forEach(ele => new PythonEditor(ele))
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});
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