300 lines
11 KiB
JavaScript
300 lines
11 KiB
JavaScript
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/**
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* @fileoverview Rule to flag non-matching identifiers
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* @author Matthieu Larcher
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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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/** @type {import('../shared/types').Rule} */
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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: "Require identifiers to match a specified regular expression",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/id-match"
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},
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schema: [
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{
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type: "string"
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},
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{
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type: "object",
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properties: {
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properties: {
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type: "boolean",
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default: false
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},
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classFields: {
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type: "boolean",
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default: false
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},
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onlyDeclarations: {
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type: "boolean",
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default: false
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},
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ignoreDestructuring: {
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type: "boolean",
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default: false
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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notMatch: "Identifier '{{name}}' does not match the pattern '{{pattern}}'.",
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notMatchPrivate: "Identifier '#{{name}}' does not match the pattern '{{pattern}}'."
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}
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},
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create(context) {
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//--------------------------------------------------------------------------
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// Options
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//--------------------------------------------------------------------------
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const pattern = context.options[0] || "^.+$",
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regexp = new RegExp(pattern, "u");
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const options = context.options[1] || {},
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checkProperties = !!options.properties,
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checkClassFields = !!options.classFields,
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onlyDeclarations = !!options.onlyDeclarations,
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ignoreDestructuring = !!options.ignoreDestructuring;
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const sourceCode = context.sourceCode;
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let globalScope;
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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// contains reported nodes to avoid reporting twice on destructuring with shorthand notation
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const reportedNodes = new Set();
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const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
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const DECLARATION_TYPES = new Set(["FunctionDeclaration", "VariableDeclarator"]);
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const IMPORT_TYPES = new Set(["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"]);
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/**
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* Checks whether the given node represents a reference to a global variable that is not declared in the source code.
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* These identifiers will be allowed, as it is assumed that user has no control over the names of external global variables.
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* @param {ASTNode} node `Identifier` node to check.
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* @returns {boolean} `true` if the node is a reference to a global variable.
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*/
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function isReferenceToGlobalVariable(node) {
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const variable = globalScope.set.get(node.name);
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return variable && variable.defs.length === 0 &&
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variable.references.some(ref => ref.identifier === node);
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}
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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 !regexp.test(name);
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}
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/**
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* Checks if a parent of a node is an ObjectPattern.
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* @param {ASTNode} node The node to check.
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* @returns {boolean} if the node is inside an ObjectPattern
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* @private
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*/
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function isInsideObjectPattern(node) {
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let { parent } = node;
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while (parent) {
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if (parent.type === "ObjectPattern") {
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return true;
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}
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parent = parent.parent;
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}
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return false;
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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 (!onlyDeclarations || DECLARATION_TYPES.has(effectiveParent.type)) &&
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!ALLOWED_PARENT_TYPES.has(effectiveParent.type) && 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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/*
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* We used the range instead of the node because it's possible
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* for the same identifier to be represented by two different
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* nodes, with the most clear example being shorthand properties:
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* { foo }
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* In this case, "foo" is represented by one node for the name
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* and one for the value. The only way to know they are the same
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* is to look at the range.
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*/
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if (!reportedNodes.has(node.range.toString())) {
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const messageId = (node.type === "PrivateIdentifier")
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? "notMatchPrivate" : "notMatch";
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context.report({
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node,
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messageId,
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data: {
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name: node.name,
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pattern
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}
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});
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reportedNodes.add(node.range.toString());
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}
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}
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return {
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Program(node) {
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globalScope = sourceCode.getScope(node);
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},
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Identifier(node) {
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const name = node.name,
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parent = node.parent,
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effectiveParent = (parent.type === "MemberExpression") ? parent.parent : parent;
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if (isReferenceToGlobalVariable(node)) {
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return;
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}
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if (parent.type === "MemberExpression") {
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if (!checkProperties) {
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return;
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}
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// Always check object names
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if (parent.object.type === "Identifier" &&
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parent.object.name === name) {
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if (isInvalid(name)) {
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report(node);
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}
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// Report AssignmentExpressions left side's assigned variable id
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} else if (effectiveParent.type === "AssignmentExpression" &&
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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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// Report AssignmentExpressions only if they are the left side of the assignment
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} else if (effectiveParent.type === "AssignmentExpression" && effectiveParent.right.type !== "MemberExpression") {
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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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// For https://github.com/eslint/eslint/issues/15123
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} else if (
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parent.type === "Property" &&
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parent.parent.type === "ObjectExpression" &&
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parent.key === node &&
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!parent.computed
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) {
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if (checkProperties && 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, and
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* AssignmentPattern nodes can be treated like Properties:
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* e.g.: const { no_camelcased = false } = bar;
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*/
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} else if (parent.type === "Property" || parent.type === "AssignmentPattern") {
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if (parent.parent && parent.parent.type === "ObjectPattern") {
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if (!ignoreDestructuring && parent.shorthand && parent.value.left && isInvalid(name)) {
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report(node);
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}
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const assignmentKeyEqualsValue = parent.key.name === parent.value.name;
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// prevent checking righthand side of destructured object
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if (!assignmentKeyEqualsValue && parent.key === node) {
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return;
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}
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const valueIsInvalid = parent.value.name && isInvalid(name);
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// ignore destructuring if the option is set, unless a new identifier is created
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if (valueIsInvalid && !(assignmentKeyEqualsValue && ignoreDestructuring)) {
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report(node);
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}
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}
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// never check properties or always ignore destructuring
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if ((!checkProperties && !parent.computed) || (ignoreDestructuring && isInsideObjectPattern(node))) {
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return;
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}
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// don't check right hand side of AssignmentExpression to prevent duplicate warnings
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if (parent.right !== node && shouldReport(effectiveParent, name)) {
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report(node);
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}
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// Check if it's an import specifier
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} else if (IMPORT_TYPES.has(parent.type)) {
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// Report only if the local imported identifier is invalid
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if (parent.local && parent.local.name === node.name && isInvalid(name)) {
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report(node);
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}
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} else if (parent.type === "PropertyDefinition") {
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if (checkClassFields && isInvalid(name)) {
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report(node);
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}
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// Report anything that is invalid that isn't 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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"PrivateIdentifier"(node) {
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const isClassField = node.parent.type === "PropertyDefinition";
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if (isClassField && !checkClassFields) {
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return;
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}
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if (isInvalid(node.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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