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mdtabeditor
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blankie 2023-10-19 15:46:45 +11:00
commit 536ab439aa
Signed by: blankie
GPG Key ID: CC15FC822C7F61F5
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9
.gitlab-ci.yml Normal file
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image: scratch
pages:
stage: deploy
artifacts:
paths:
- .
only:
- master

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LICENSE Normal file
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Copyright (c) 2023 blankie
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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deserialize_table.mjs Normal file
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/*
* line: string, must be trimmed of whitespace beforehand
* tableItems: int | null, result output will be padded or trimmed to it if specified
*
* Returns an array of strings
*/
function splitByPipe(line, tableItems = null) {
let res = [];
let item = "";
let consecutiveBackslashes = 0;
if (line.startsWith("|")) {
line = line.substring(1);
}
for (let char of line) {
if (char === "\\") {
item += "\\";
consecutiveBackslashes++;
} else if (char === "|" && consecutiveBackslashes % 2 === 1) {
item = item.substring(0, item.length - 1) + "|";
consecutiveBackslashes = 0;
} else if (char === "|" && consecutiveBackslashes % 2 === 0) {
item = item.trim();
res.push(item);
item = "";
consecutiveBackslashes = 0;
} else {
item += char;
consecutiveBackslashes = 0;
}
}
item = item.trim();
if (item.length !== 0) {
res.push(item);
}
while (tableItems !== null && res.length < tableItems) {
res.push("");
}
while (tableItems !== null && res.length > tableItems) {
res.pop();
}
return res;
}
/*
* line: string, must be trimmed of whitespace beforehand
* headerRow: array of strings
*
* Returns an array of objects, which has the following keys:
* - text: string
* - leftAligned: boolean
* - rightAligned: boolean
*/
function parseDelimiterRow(line, headerRow) {
let res = [];
let delimiterRow = splitByPipe(line);
if (delimiterRow.length !== headerRow.length) {
throw new Error(`delimiter row is not as long as the header row (${delimiterRow.length} !== ${headerRow.length})`);
}
for (let i = 0; i < headerRow.length; i++) {
let header = headerRow[i];
let delimiter = delimiterRow[i];
let match = delimiter.match(/^(:)?-+(:)?$/);
if (match === null) {
throw new Error(`invalid delimiter row (index: ${i}): ${delimiter}`);
}
res.push({
text: header,
leftAligned: match[1] === ":",
rightAligned: match[2] === ":"
});
}
return res;
}
/*
* lines: array of strings, each item must be trimmed of whitespace beforehand
*
* See parseDelimiterRow() for the return type
*/
function parseHeader(lines) {
if (lines.length < 2) {
throw new Error(`input must be at least 2 lines long (${lines.length} < 2)`);
}
let headerRow = splitByPipe(lines[0]);
if (headerRow.length === 0) {
throw new Error("header row must have at least one item");
}
return parseDelimiterRow(lines[1], headerRow);
}
/*
* input: string
*
* Returns an object with the following keys:
* - columns: See parseHeader() for the first item
* - rows: array of an array of strings
*/
function deserializeTable(input) {
let lines = [];
let rows = [];
for (let line of input.trim().split("\n")) {
lines.push(line.trim());
}
let columns = parseHeader(lines);
for (let i = 2; i < lines.length; i++) {
rows.push(splitByPipe(lines[i], columns.length));
}
return {columns, rows};
}
export {deserializeTable};

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<!DOCTYPE html>
<head>
<meta charset="utf-8" />
<title>Markdown Table Editor</title>
<link rel="stylesheet" href="style.css" />
<script asyhc type="module" src="main.mjs"></script>
</head>
<body>
<noscript><p class="left right">Javascript is required because the closest non-JS alternative is doing everything server-side, and I do not want to bother with that</p></noscript>
<dialog id="load-dialog">
<h3>Load table</h3>
<span id="error"></span>
<textarea autofocus></textarea>
<hr>
<div class="buttons">
<button id="load-button">Load table</button>
<form method="dialog">
<button>Close</button>
</form>
</div>
</dialog>
<button id="open-load-button">Load table</button>
<hr>
<dialog id="item-context-menu">
<form id="alignment-radios">
<fieldset>
<legend>Column alignment:</legend>
<label>
<input type="radio" name="alignment" id="none" />
None
</label>
<label>
<input type="radio" name="alignment" id="left" />
Left
</label>
<label>
<input type="radio" name="alignment" id="center" />
Center
</label>
<label>
<input type="radio" name="alignment" id="right" />
Right
</label>
</fieldset>
</form>
<br>
<button id="delete-row">Delete row</button>
<button id="delete-column">Delete column</button>
<hr>
<button id="insert-row-above">Insert row above</button>
<button id="insert-row-below">Insert row below</button>
<button id="insert-column-left">Insert column to the left</button>
<button id="insert-column-right">Insert column to the right</button>
</dialog>
Hold Shift to suppress table controls
<div class="table-container">
<table></table>
</div>
<hr>
<button id="copy-to-clipboard">Copy to Clipboard</button>
<textarea id="output" readonly rows="15"></textarea>
<hr>
<footer class="left right"><a href="https://gitlab.com/blankX/mdtabeditor">Source code</a> (<a href="https://git.nixnet.services/blankie/mdtabeditor">Mirror</a>)</footer>
</body>

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import {deserializeTable, serializeTable, calculateColumnLength} from "./tables.mjs";
let loadDialog = document.querySelector("#load-dialog");
let itemContextMenu = document.querySelector("#item-context-menu");
let deleteRow = itemContextMenu.querySelector("#delete-row");
let deleteColumn = itemContextMenu.querySelector("#delete-column");
let insertRowAbove = itemContextMenu.querySelector("#insert-row-above");
let insertRowBelow = itemContextMenu.querySelector("#insert-row-below");
let insertColumnLeft = itemContextMenu.querySelector("#insert-column-left");
let insertColumnRight = itemContextMenu.querySelector("#insert-column-right");
let output = document.querySelector("#output");
let tableElement = document.querySelector("table");
let table = {
columns: [
{text: "ABC", leftAligned: false, rightAligned: false},
{text: "DEF", leftAligned: false, rightAligned: false},
{text: "GHI", leftAligned: false, rightAligned: false}
],
rows: [
["1", "2", "3"],
["4", "5", "6"],
["7", "8", "9"]
]
};
Array.prototype.insert = function(index, item) {
this.splice(index, 0, item);
};
Array.prototype.remove = function(index) {
this.splice(index, 1);
};
Node.prototype.insertAfter = function(newNode, referenceNode) {
this.insertBefore(newNode, referenceNode?.nextSibling);
};
NodeList.prototype.indexOf = function(searchElement) {
for (let [index, element] of this.entries()) {
if (element === searchElement) {
return index;
}
}
return -1;
};
function findTableIndices(textarea) {
let index = tableElement.querySelectorAll("textarea").indexOf(textarea);
let columnIndex = index % table.columns.length;
let rowIndex = -1;
if (index >= table.columns.length) {
rowIndex = Math.floor(index / table.columns.length - 1);
}
return {columnIndex, rowIndex};
}
function updateItemAlignment(textarea, column) {
textarea.classList.remove("left");
textarea.classList.remove("right");
if (column.leftAligned) {
textarea.classList.add("left");
}
if (column.rightAligned) {
textarea.classList.add("right");
}
}
function createItemElement(item, column) {
let textarea = document.createElement("textarea");
textarea.rows = 1;
textarea.cols = column.maxLength;
textarea.value = item;
if (column.leftAligned) {
textarea.classList.add("left");
}
if (column.rightAligned) {
textarea.classList.add("right");
}
return textarea;
}
function createRowElement(row, isHeader) {
let tr = document.createElement(isHeader ? "th" : "tr");
for (let i = 0; i < row.length; i++) {
let td = document.createElement("td");
td.appendChild(createItemElement(row[i], table.columns[i]));
tr.appendChild(td);
}
return tr;
}
function reloadTable() {
for (let i = 0; i < table.columns.length; i++) {
table.columns[i].maxLength = calculateColumnLength(table.columns[i], table.rows, i);
}
while (tableElement.lastChild) {
tableElement.removeChild(tableElement.lastChild);
}
let columnRow = [];
for (let column of table.columns) {
columnRow.push(column.text);
}
tableElement.appendChild(createRowElement(columnRow, true));
for (let row of table.rows) {
tableElement.appendChild(createRowElement(row, false));
}
output.value = serializeTable(table);
}
loadDialog.querySelector("#load-button").addEventListener("click", function() {
try {
table = deserializeTable(loadDialog.querySelector("textarea").value);
reloadTable();
loadDialog.close();
} catch (e) {
loadDialog.querySelector("#error").innerText = e.message;
}
}, {passive: true});
document.querySelector("#open-load-button").addEventListener("click", function() {
loadDialog.querySelector("textarea").value = "";
loadDialog.querySelector("#error").innerText = "";
loadDialog.showModal();
}, {passive: true});
itemContextMenu.querySelector("form").addEventListener("change", function(event) {
let leftAligned = ["left", "center"].includes(event.target.id);
let rightAligned = ["center", "right"].includes(event.target.id);
let columnIndex = parseInt(itemContextMenu.dataset.columnIndex, 10);
let column = table.columns[columnIndex];
column.leftAligned = leftAligned;
column.rightAligned = rightAligned;
updateItemAlignment(tableElement.querySelectorAll("th textarea")[columnIndex], column);
for (let tr of tableElement.querySelectorAll("tr")) {
updateItemAlignment(tr.querySelectorAll("textarea")[columnIndex], column);
}
output.value = serializeTable(table);
});
deleteRow.addEventListener("click", function() {
let rowIndex = parseInt(itemContextMenu.dataset.rowIndex, 10);
table.rows.remove(rowIndex);
tableElement.querySelectorAll("tr")[rowIndex].remove();
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
deleteColumn.addEventListener("click", function() {
let columnIndex = parseInt(itemContextMenu.dataset.columnIndex, 10);
table.columns.remove(columnIndex);
for (let row of table.rows) {
row.remove(columnIndex);
}
for (let tr of tableElement.querySelectorAll("th, tr")) {
tr.querySelectorAll("td")[columnIndex].remove();
}
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
insertRowAbove.addEventListener("click", function() {
let rowIndex = parseInt(itemContextMenu.dataset.rowIndex, 10);
let newRow = new Array(table.columns.length);
newRow.fill("");
table.rows.insert(rowIndex, newRow);
tableElement.insertBefore(createRowElement(newRow, false), tableElement.querySelectorAll("tr")[rowIndex]);
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
insertRowBelow.addEventListener("click", function() {
let rowIndex = parseInt(itemContextMenu.dataset.rowIndex, 10);
let newRow = new Array(table.columns.length);
newRow.fill("");
table.rows.insert(rowIndex + 1, newRow);
let rowElement = createRowElement(newRow, false);
let referenceNode = rowIndex >= 0
? tableElement.querySelectorAll("tr")[rowIndex]
: tableElement.querySelector("th");
tableElement.insertAfter(rowElement, referenceNode);
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
insertColumnLeft.addEventListener("click", function() {
let columnIndex = parseInt(itemContextMenu.dataset.columnIndex, 10);
let column = {
text: "",
leftAligned: false,
rightAligned: false,
maxLength: 3
};
table.columns.insert(columnIndex, column);
for (let row of table.rows) {
row.insert(columnIndex, "");
}
let td = document.createElement("td");
td.appendChild(createItemElement("", column));
let th = tableElement.querySelector("th");
for (let tr of tableElement.querySelectorAll("th, tr")) {
tr.insertBefore(td.cloneNode(true), tr.querySelectorAll("td")[columnIndex]);
}
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
insertColumnRight.addEventListener("click", function() {
let columnIndex = parseInt(itemContextMenu.dataset.columnIndex, 10);
let column = {
text: "",
leftAligned: false,
rightAligned: false,
maxLength: 3
};
table.columns.insert(columnIndex + 1, column);
for (let row of table.rows) {
row.insert(columnIndex + 1, "");
}
let td = document.createElement("td");
td.appendChild(createItemElement("", column));
let th = tableElement.querySelector("th");
for (let tr of tableElement.querySelectorAll("th, tr")) {
tr.insertAfter(td.cloneNode(true), tr.querySelectorAll("td")[columnIndex]);
}
output.value = serializeTable(table);
itemContextMenu.close();
}, {passive: true});
tableElement.addEventListener("input", function(event) {
let {columnIndex, rowIndex} = findTableIndices(event.target);
if (rowIndex < 0) {
// is modifying a header
table.columns[columnIndex].text = event.target.value;
} else {
// is modifying a row
table.rows[rowIndex][columnIndex] = event.target.value;
}
output.value = serializeTable(table);
table.columns[columnIndex].maxLength = calculateColumnLength(table.columns[columnIndex], table.rows, columnIndex);
for (let rowElement of tableElement.querySelectorAll("th, tr")) {
rowElement.children[columnIndex].querySelector("textarea").cols = table.columns[columnIndex].maxLength;
}
});
tableElement.addEventListener("contextmenu", function(event) {
if (event.shiftKey || event.target.localName !== "textarea") {
return;
}
let {columnIndex, rowIndex} = findTableIndices(event.target);
itemContextMenu.dataset.columnIndex = columnIndex;
itemContextMenu.dataset.rowIndex = rowIndex;
itemContextMenu.style.margin = 0;
itemContextMenu.style.top = itemContextMenu.style.left = "0px";
itemContextMenu.showModal();
let rect = itemContextMenu.getBoundingClientRect();
let top = event.clientY;
let left = event.clientX;
if (top + rect.height > window.innerHeight) {
top = window.innerHeight - rect.height;
}
if (left + rect.width > window.innerWidth) {
left = window.innerWidth - rect.width;
}
itemContextMenu.style.margin = 0;
itemContextMenu.style.top = `${top}px`;
itemContextMenu.style.left = `${left}px`;
let column = table.columns[columnIndex];
if (column.leftAligned && column.rightAligned) {
itemContextMenu.querySelector("#center").checked = true;
} else if (column.leftAligned) {
itemContextMenu.querySelector("#left").checked = true;
} else if (column.rightAligned) {
itemContextMenu.querySelector("#right").checked = true;
} else {
itemContextMenu.querySelector("#none").checked = true;
}
deleteRow.disabled = event.target.closest("th") !== null;
deleteColumn.disabled = table.columns.length < 2;
insertRowAbove.disabled = event.target.closest("th") !== null;
event.preventDefault();
});
document.querySelector("#copy-to-clipboard").addEventListener("click", function() {
output.select();
navigator.clipboard.writeText(output.value).then(
function() {
// success
},
function(reason) {
// TODO: make visible to user
console.error(`Failed to copy to clipboard: ${reason}`);
}
);
}, {passive: true});
window.addEventListener("click", function(event) {
if (event.target.localName !== "dialog") {
return;
}
let rect = event.target.getBoundingClientRect();
if (rect.top <= event.clientY && rect.left <= event.clientX && rect.bottom >= event.clientY && rect.right >= event.clientX) {
return;
}
event.target.close();
}, {passive: true});
reloadTable();

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/*
* str: string
*
* Returns a string
*/
function escapeItem(str) {
return str.replaceAll(/(\\*)\|/g, function(match, backslashes) {
if (backslashes.length % 2 === 0) {
backslashes += "\\";
}
return backslashes + "|";
});
}
/*
* escapedColumns: array of objects
* escapedRow: array of string
*
* Returns a string
*/
function writeRow(escapedColumns, escapedRow) {
let res = "";
for (let i = 0; i < escapedColumns.length; i++) {
let escapedColumn = escapedColumns[i];
let escapedItem = escapedRow[i];
res += `| ${escapedItem}${" ".repeat(escapedColumn.maxLength - escapedItem.length)} `;
}
res += "|";
return res;
}
/*
* escapedColumns: array of objects
*
* Returns a string
*/
function writeHeader(escapedColumns) {
let headerRow = [];
let delimiterRow = [];
for (let escapedColumn of escapedColumns) {
headerRow.push(escapedColumn.text);
let delimiter = "";
if (escapedColumn.leftAligned) {
delimiter += ":";
}
delimiter += "-".repeat(escapedColumn.maxLength - escapedColumn.leftAligned - escapedColumn.rightAligned);
if (escapedColumn.rightAligned) {
delimiter += ":";
}
delimiterRow.push(delimiter);
}
return writeRow(escapedColumns, headerRow) + "\n" + writeRow(escapedColumns, delimiterRow);
}
/*
* column: object
* rows: array of array of strings
* headerIndex: integer
*
* Returns an integer
*/
function calculateColumnLength(column, rows, columnIndex) {
let length = Math.max(column.text.length, 3);
for (let row of rows) {
let item = row[columnIndex];
if (item.length > length) {
length = item.length;
}
}
return length;
}
/*
* table: object
*
* Returns a string
*/
function serializeTable(table) {
let escapedColumns = [];
let escapedRows = [];
for (let column of table.columns) {
escapedColumns.push({
text: escapeItem(column.text),
leftAligned: column.leftAligned,
rightAligned: column.rightAligned
});
}
for (let row of table.rows) {
let escapedRow = [];
for (let item of row) {
escapedRow.push(escapeItem(item));
}
escapedRows.push(escapedRow);
}
for (let i = 0; i < escapedColumns.length; i++) {
escapedColumns[i].maxLength = calculateColumnLength(escapedColumns[i], escapedRows, i);
}
let res = writeHeader(escapedColumns);
for (let escapedRow of escapedRows) {
res += "\n" + writeRow(escapedColumns, escapedRow);
}
return res;
}
// XXX: perhaps calculateColumnLength could be placed somewhere else?
export {serializeTable, calculateColumnLength};

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html:has(dialog[open]) {
overflow: hidden;
}
/* prevent table from wrapping when contents are too long */
table {
min-width: max-content;
}
/* prevent textboxes from soft-wrapping */
textarea {
white-space: pre;
}
th {
padding: 0;
}
td {
display: inline;
}
textarea {
resize: none;
}
.left {
text-align: left;
}
.right {
text-align: right;
}
.left.right {
text-align: center;
}
#load-dialog h3 {
margin-top: 0;
margin-bottom: 0.5em;
}
#load-dialog #error {
display: block;
}
#load-dialog textarea {
width: 80vw;
height: 75vh;
}
#load-dialog .buttons {
text-align: right;
}
#load-dialog form {
display: inline;
}
#item-context-menu br {
display: block;
margin-top: 8px;
}
#item-context-menu button {
display: block;
}
.table-container {
overflow-x: scroll;
scrollbar-width: thin;
}
th textarea {
font-weight: bold;
}
#output {
width: 100%;
}

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import {deserializeTable} from "./deserialize_table.mjs";
import {serializeTable, calculateColumnLength} from "./serialize_table.mjs";
export {deserializeTable, serializeTable, calculateColumnLength};