一个为力扣 SQL 题目编辑器自动注入表名、列名的插件
// ==UserScript==
// @name LeetCode SQL Autocomplete
// @namespace https://github.com/linyisu/leetcode-sql-autocomplete
// @version 1.1.0
// @author linyisu
// @match https://leetcode.cn/problems/*
// @match https://leetcode.com/problems/*
// @license MIT
// @description 一个为力扣 SQL 题目编辑器自动注入表名、列名的插件
// @grant none
// ==/UserScript==
(function () {
'use strict';
const KEYWORDS = [
// query
'SELECT', 'FROM', 'WHERE', 'AS', 'DISTINCT', 'LIMIT', 'OFFSET', 'ALL', 'ANY',
// join
'JOIN', 'LEFT JOIN', 'RIGHT JOIN', 'INNER JOIN', 'CROSS JOIN', 'NATURAL JOIN', 'ON', 'USING',
// logic / comparison
'AND', 'OR', 'NOT', 'IN', 'NOT IN', 'EXISTS', 'NOT EXISTS',
'BETWEEN', 'LIKE', 'REGEXP', 'IS NULL', 'IS NOT NULL', 'NULL',
// grouping / ordering
'GROUP BY', 'HAVING', 'ORDER BY', 'ASC', 'DESC',
// set operations
'UNION', 'UNION ALL', 'INTERSECT', 'EXCEPT',
// CTE
'WITH', 'RECURSIVE',
// conditional
'CASE', 'WHEN', 'THEN', 'ELSE', 'END',
'IF', 'IFNULL', 'NULLIF', 'COALESCE', 'GREATEST', 'LEAST', 'ISNULL',
// aggregate
'COUNT', 'SUM', 'AVG', 'MAX', 'MIN',
'GROUP_CONCAT', 'SEPARATOR',
// math
'ROUND', 'FLOOR', 'CEIL', 'CEILING', 'ABS', 'MOD', 'POW', 'POWER', 'SQRT', 'TRUNCATE', 'SIGN',
// string
'CONCAT', 'CONCAT_WS', 'LENGTH', 'CHAR_LENGTH', 'SUBSTRING', 'SUBSTR',
'LEFT', 'RIGHT', 'TRIM', 'LTRIM', 'RTRIM', 'UPPER', 'LOWER',
'REPLACE', 'LOCATE', 'INSTR', 'LPAD', 'RPAD', 'REPEAT', 'REVERSE', 'FORMAT',
// type conversion
'CAST', 'CONVERT',
// date / time
'NOW', 'CURDATE', 'CURTIME', 'CURRENT_DATE', 'CURRENT_TIMESTAMP',
'DATE', 'DATE_ADD', 'DATE_SUB', 'DATEDIFF', 'DATE_FORMAT', 'STR_TO_DATE',
'TIMESTAMPDIFF', 'EXTRACT',
'YEAR', 'MONTH', 'DAY', 'HOUR', 'MINUTE', 'SECOND', 'WEEK', 'QUARTER', 'LAST_DAY',
// window functions
'RANK', 'DENSE_RANK', 'ROW_NUMBER', 'NTILE',
'LAG', 'LEAD', 'FIRST_VALUE', 'LAST_VALUE', 'NTH_VALUE',
'PERCENT_RANK', 'CUME_DIST',
'OVER', 'PARTITION BY', 'ROWS BETWEEN', 'RANGE BETWEEN',
'UNBOUNDED PRECEDING', 'CURRENT ROW', 'UNBOUNDED FOLLOWING',
];
function extractSchema() {
const tableNames = [];
const columns = [];
const seenTables = new Set();
const seenCols = new Set();
const descEl =
document.querySelector('[data-track-load="description_content"]') ||
document.querySelector('.question-content__JfgR') ||
document.querySelector('.question-content') ||
document.querySelector('[class*="description"]');
if (!descEl) return { tableNames, columns };
for (const pre of descEl.querySelectorAll('pre')) {
const lines = pre.textContent.split('\n');
let headerIdx = -1;
for (let i = 0; i < lines.length; i++) {
if (/column\s+name/i.test(lines[i])) { headerIdx = i; break; }
}
if (headerIdx === -1) continue;
let sibling = pre.previousElementSibling;
while (sibling) {
if (sibling.tagName === 'PRE') break;
if (/(\btable\s*|表\s*)[:：]/i.test(sibling.textContent)) {
const codes = sibling.querySelectorAll('code');
if (codes.length > 0) {
for (const code of codes) {
const name = code.textContent.trim();
if (/^\w+$/.test(name) && name.length > 1 && !seenTables.has(name)) {
seenTables.add(name);
tableNames.push(name);
}
}
} else {
const m = sibling.textContent.match(/(\w+)\s*表\s*[:：]/i) ||
sibling.textContent.match(/(?:\btable\s*)[:：]\s*(\w+)/i);
if (m && m[1].length > 1 && !seenTables.has(m[1])) {
seenTables.add(m[1]);
tableNames.push(m[1]);
}
}
break;
}
sibling = sibling.previousElementSibling;
}
for (let i = headerIdx + 1; i < lines.length; i++) {
const line = lines[i];
if (/^\s*\+/.test(line)) continue;
if (!/\|/.test(line)) break;
const parts = line.split('|');
if (parts.length >= 2) {
const colName = parts[1].trim();
const colType = parts.length >= 3 ? parts[2].trim() : '';
if (colName && !seenCols.has(colName)) {
seenCols.add(colName);
columns.push({ name: colName, type: colType });
}
}
}
}
for (const pre of descEl.querySelectorAll('pre')) {
const lines = pre.textContent.split('\n');
let inOutput = false;
for (let i = 0; i < lines.length; i++) {
const trimmed = lines[i].trim();
if (/^(?:input|inputs)\b/i.test(trimmed) || /^输入/.test(trimmed)) inOutput = false;
if (/^(?:output|outputs)\b/i.test(trimmed) || /^输出/.test(trimmed)) inOutput = true;
if (!inOutput) {
const nameMatch = trimmed.match(/(\w+)\s*(?:table|表)\s*[:：]/i);
if (nameMatch) {
const name = nameMatch[1];
if (name.length > 1 && !/^(input|output|inputs|outputs|example|explanation|note|follow|hint|return)$/i.test(name) && !seenTables.has(name)) {
seenTables.add(name);
tableNames.push(name);
}
}
}
if (/^\+[-+]+$/.test(trimmed)) {
let j = i + 1;
while (j < lines.length && /^\+/.test(lines[j].trim())) j++;
if (j < lines.length && /^\|/.test(lines[j].trim()) && !/column\s+name/i.test(lines[j])) {
for (const part of lines[j].split('|').slice(1, -1)) {
const colName = part.trim();
if (colName && colName.length > 1 && /^[a-zA-Z_]\w*$/.test(colName) && !seenCols.has(colName)) {
seenCols.add(colName);
columns.push({ name: colName, type: '' });
}
}
}
i = j;
while (i + 1 < lines.length && /^[|+]/.test(lines[i + 1].trim())) i++;
}
}
}
return { tableNames, columns };
}
let disposable = null;
let lastSchemaKey = '';
function registerProvider(monaco, tableNames, columns) {
if (disposable) {
try { disposable.dispose(); } catch (_) { }
disposable = null;
}
if (tableNames.length === 0 && columns.length === 0) return;
const { CompletionItemKind } = monaco.languages;
const items = [
...tableNames.map(name => ({
label: { label: name, description: 'table' },
kind: CompletionItemKind.Class,
insertText: name,
sortText: '0_' + name,
})),
...columns.map(({ name, type }) => ({
label: { label: name, description: type },
kind: CompletionItemKind.Field,
insertText: name,
sortText: '1_' + name,
})),
];
const langs = ['mysql', 'sql', 'pgsql', 'plaintext'];
const providers = langs.map(lang =>
monaco.languages.registerCompletionItemProvider(lang, {
provideCompletionItems(model, position) {
const textUntilPos = model.getValueInRange({
startLineNumber: position.lineNumber,
startColumn: 1,
endLineNumber: position.lineNumber,
endColumn: position.column,
});
const wordMatch = textUntilPos.match(/\w+$/);
const currentWord = wordMatch ? wordMatch[0] : '';
const range = {
startLineNumber: position.lineNumber,
endLineNumber: position.lineNumber,
startColumn: wordMatch ? position.column - currentWord.length : position.column,
endColumn: position.column,
};
const isLower = currentWord.length > 0 && /[a-z]/.test(currentWord) && currentWord === currentWord.toLowerCase();
const kwItems = KEYWORDS.map(kw => ({
label: isLower ? kw.toLowerCase() : kw,
kind: CompletionItemKind.Keyword,
insertText: isLower ? kw.toLowerCase() : kw,
sortText: '5_' + kw,
range,
}));
const schemaLabels = new Set([
...items.map(i => typeof i.label === 'string' ? i.label : i.label.label),
...KEYWORDS,
...KEYWORDS.map(kw => kw.toLowerCase()),
]);
const docWords = new Set(
(model.getValue().match(/\b[a-zA-Z_]\w*\b/g) || [])
.filter(w => w.length > 1 && w !== currentWord && !schemaLabels.has(w))
);
return {
suggestions: [
...items.map(item => ({ ...item, range })),
...kwItems,
...[...docWords].map(w => ({
label: w,
kind: CompletionItemKind.Text,
insertText: w,
sortText: '9_' + w,
range,
})),
],
};
},
})
);
disposable = { dispose() { providers.forEach(p => p.dispose()); } };
monaco.editor.getEditors().forEach(editor => {
editor.updateOptions({
quickSuggestions: { other: true, comments: false, strings: false },
});
});
}
function waitForMonaco(timeout = 30_000) {
return new Promise((resolve, reject) => {
if (window.monaco?.languages?.registerCompletionItemProvider) return resolve(window.monaco);
const interval = setInterval(() => {
if (window.monaco?.languages?.registerCompletionItemProvider) {
clearInterval(interval);
resolve(window.monaco);
}
}, 500);
setTimeout(() => { clearInterval(interval); reject(new Error('Monaco timeout')); }, timeout);
});
}
async function main() {
let monaco;
try {
monaco = await waitForMonaco();
} catch (_) {
console.warn('[SQ] Monaco 未就绪，退出');
return;
}
doInject(monaco);
let lastUrl = location.href;
let debounceTimer = null;
new MutationObserver(() => {
if (location.href !== lastUrl) {
lastUrl = location.href;
lastSchemaKey = '';
clearTimeout(debounceTimer);
debounceTimer = setTimeout(() => doInject(monaco), 2000);
}
}).observe(document.body, { childList: true, subtree: true });
let descTimer = null;
new MutationObserver(() => {
clearTimeout(descTimer);
descTimer = setTimeout(() => {
const { tableNames, columns } = extractSchema();
const key = tableNames.join(',') + '|' + columns.map(c => c.name).join(',');
if ((tableNames.length > 0 || columns.length > 0) && key !== lastSchemaKey) {
lastSchemaKey = key;
registerProvider(monaco, tableNames, columns);
}
}, 800);
}).observe(document.body, { childList: true, subtree: true });
}
function doInject(monaco) {
setTimeout(() => {
const { tableNames, columns } = extractSchema();
const key = tableNames.join(',') + '|' + columns.map(c => c.name).join(',');
if (key !== lastSchemaKey) {
lastSchemaKey = key;
registerProvider(monaco, tableNames, columns);
}
}, 1000);
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', () => main());
} else {
main();
}
})();