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/**
* @fileoverview Rule that warns when identifier names that are
* blacklisted in the configuration are used.
* @author Keith Cirkel (http://keithcirkel.co.uk)
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "disallow specified identifiers",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/id-blacklist"
},
schema: {
type: "array",
items: {
type: "string"
},
uniqueItems: true
},
messages: {
blacklisted: "Identifier '{{name}}' is blacklisted."
}
},
create(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
const blacklist = context.options;
/**
* Checks if a string matches the provided pattern
* @param {string} name The string to check.
* @returns {boolean} if the string is a match
* @private
*/
function isInvalid(name) {
return blacklist.indexOf(name) !== -1;
}
/**
* Verifies if we should report an error or not based on the effective
* parent node and the identifier name.
* @param {ASTNode} effectiveParent The effective parent node of the node to be reported
* @param {string} name The identifier name of the identifier node
* @returns {boolean} whether an error should be reported or not
*/
function shouldReport(effectiveParent, name) {
return effectiveParent.type !== "CallExpression" &&
effectiveParent.type !== "NewExpression" &&
isInvalid(name);
}
/**
* Reports an AST node as a rule violation.
* @param {ASTNode} node The node to report.
* @returns {void}
* @private
*/
function report(node) {
context.report({
node,
messageId: "blacklisted",
data: {
name: node.name
}
});
}
return {
Identifier(node) {
const name = node.name,
effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
// MemberExpressions get special rules
if (node.parent.type === "MemberExpression") {
// Always check object names
if (node.parent.object.type === "Identifier" &&
node.parent.object.name === node.name) {
if (isInvalid(name)) {
report(node);
}
// Report AssignmentExpressions only if they are the left side of the assignment
} else if (effectiveParent.type === "AssignmentExpression" &&
(effectiveParent.right.type !== "MemberExpression" ||
effectiveParent.left.type === "MemberExpression" &&
effectiveParent.left.property.name === node.name)) {
if (isInvalid(name)) {
report(node);
}
}
// Properties have their own rules
} else if (node.parent.type === "Property") {
if (shouldReport(effectiveParent, name)) {
report(node);
}
// Report anything that is a match and not a CallExpression
} else if (shouldReport(effectiveParent, name)) {
report(node);
}
}
};
}
};