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127 lines
4.1 KiB
JavaScript
127 lines
4.1 KiB
JavaScript
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/**
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* @fileoverview Rule to flag use of unnecessary semicolons
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const FixTracker = require("./utils/fix-tracker");
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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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 unnecessary semicolons",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-extra-semi"
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},
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fixable: "code",
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schema: [],
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messages: {
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unexpected: "Unnecessary semicolon."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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/**
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* Reports an unnecessary semicolon error.
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* @param {Node|Token} nodeOrToken A node or a token to be reported.
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* @returns {void}
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*/
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function report(nodeOrToken) {
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context.report({
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node: nodeOrToken,
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messageId: "unexpected",
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fix(fixer) {
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/*
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* Expand the replacement range to include the surrounding
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* tokens to avoid conflicting with semi.
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* https://github.com/eslint/eslint/issues/7928
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*/
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return new FixTracker(fixer, context.getSourceCode())
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.retainSurroundingTokens(nodeOrToken)
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.remove(nodeOrToken);
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}
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});
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}
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/**
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* Checks for a part of a class body.
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* This checks tokens from a specified token to a next MethodDefinition or the end of class body.
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* @param {Token} firstToken The first token to check.
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* @returns {void}
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*/
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function checkForPartOfClassBody(firstToken) {
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for (let token = firstToken;
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token.type === "Punctuator" && !astUtils.isClosingBraceToken(token);
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token = sourceCode.getTokenAfter(token)
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) {
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if (astUtils.isSemicolonToken(token)) {
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report(token);
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}
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}
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}
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return {
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/**
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* Reports this empty statement, except if the parent node is a loop.
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* @param {Node} node A EmptyStatement node to be reported.
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* @returns {void}
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*/
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EmptyStatement(node) {
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const parent = node.parent,
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allowedParentTypes = [
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"ForStatement",
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"ForInStatement",
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"ForOfStatement",
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"WhileStatement",
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"DoWhileStatement",
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"IfStatement",
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"LabeledStatement",
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"WithStatement"
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];
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if (allowedParentTypes.indexOf(parent.type) === -1) {
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report(node);
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}
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},
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/**
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* Checks tokens from the head of this class body to the first MethodDefinition or the end of this class body.
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* @param {Node} node A ClassBody node to check.
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* @returns {void}
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*/
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ClassBody(node) {
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checkForPartOfClassBody(sourceCode.getFirstToken(node, 1)); // 0 is `{`.
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},
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/**
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* Checks tokens from this MethodDefinition to the next MethodDefinition or the end of this class body.
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* @param {Node} node A MethodDefinition node of the start point.
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* @returns {void}
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*/
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MethodDefinition(node) {
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checkForPartOfClassBody(sourceCode.getTokenAfter(node));
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}
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};
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}
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};
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