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