no-extra-semi.js
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/**
* @fileoverview Rule to flag use of unnecessary semicolons
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
/**
* 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,
message: "Unnecessary semicolon.",
fix: function(fixer) {
return fixer.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 (var token = firstToken;
token.type === "Punctuator" && token.value !== "}";
token = context.getTokenAfter(token)
) {
if (token.value === ";") {
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": function(node) {
var parent = node.parent,
allowedParentTypes = ["ForStatement", "ForInStatement", "ForOfStatement", "WhileStatement", "DoWhileStatement"];
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": function(node) {
checkForPartOfClassBody(context.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": function(node) {
checkForPartOfClassBody(context.getTokenAfter(node));
}
};
};
module.exports.schema = [];