75 lines
2.0 KiB
JavaScript
75 lines
2.0 KiB
JavaScript
/**
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* @fileoverview Rule to flag use of an lexical declarations inside a case clause
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* @author Erik Arvidsson
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*/
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'use strict';
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../types').Rule.RuleModule} */
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module.exports = {
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Disallow lexical declarations in case clauses',
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recommended: true,
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url: 'https://eslint.org/docs/latest/rules/no-case-declarations',
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},
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hasSuggestions: true,
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schema: [],
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messages: {
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addBrackets: 'Add {} brackets around the case block.',
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unexpected: 'Unexpected lexical declaration in case block.',
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},
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},
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create(context) {
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/**
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* Checks whether or not a node is a lexical declaration.
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* @param {ASTNode} node A direct child statement of a switch case.
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* @returns {boolean} Whether or not the node is a lexical declaration.
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*/
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function isLexicalDeclaration(node) {
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switch (node.type) {
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case 'FunctionDeclaration':
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case 'ClassDeclaration':
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return true;
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case 'VariableDeclaration':
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return node.kind !== 'var';
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default:
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return false;
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}
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}
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return {
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SwitchCase(node) {
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for (let i = 0; i < node.consequent.length; i++) {
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const statement = node.consequent[i];
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if (isLexicalDeclaration(statement)) {
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context.report({
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node: statement,
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messageId: 'unexpected',
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suggest: [
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{
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messageId: 'addBrackets',
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fix: (fixer) => [
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fixer.insertTextBefore(node.consequent[0], '{ '),
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fixer.insertTextAfter(node.consequent.at(-1), ' }'),
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],
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},
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],
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});
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}
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}
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},
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};
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},
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};
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