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