You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
346 lines
12 KiB
346 lines
12 KiB
/**
|
|
* @fileoverview Rule to enforce getter and setter pairs in objects and classes.
|
|
* @author Gyandeep Singh
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("./utils/ast-utils");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Typedefs
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Property name if it can be computed statically, otherwise the list of the tokens of the key node.
|
|
* @typedef {string|Token[]} Key
|
|
*/
|
|
|
|
/**
|
|
* Accessor nodes with the same key.
|
|
* @typedef {Object} AccessorData
|
|
* @property {Key} key Accessor's key
|
|
* @property {ASTNode[]} getters List of getter nodes.
|
|
* @property {ASTNode[]} setters List of setter nodes.
|
|
*/
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Checks whether or not the given lists represent the equal tokens in the same order.
|
|
* Tokens are compared by their properties, not by instance.
|
|
* @param {Token[]} left First list of tokens.
|
|
* @param {Token[]} right Second list of tokens.
|
|
* @returns {boolean} `true` if the lists have same tokens.
|
|
*/
|
|
function areEqualTokenLists(left, right) {
|
|
if (left.length !== right.length) {
|
|
return false;
|
|
}
|
|
|
|
for (let i = 0; i < left.length; i++) {
|
|
const leftToken = left[i],
|
|
rightToken = right[i];
|
|
|
|
if (leftToken.type !== rightToken.type || leftToken.value !== rightToken.value) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not the given keys are equal.
|
|
* @param {Key} left First key.
|
|
* @param {Key} right Second key.
|
|
* @returns {boolean} `true` if the keys are equal.
|
|
*/
|
|
function areEqualKeys(left, right) {
|
|
if (typeof left === "string" && typeof right === "string") {
|
|
|
|
// Statically computed names.
|
|
return left === right;
|
|
}
|
|
if (Array.isArray(left) && Array.isArray(right)) {
|
|
|
|
// Token lists.
|
|
return areEqualTokenLists(left, right);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not a given node is of an accessor kind ('get' or 'set').
|
|
* @param {ASTNode} node A node to check.
|
|
* @returns {boolean} `true` if the node is of an accessor kind.
|
|
*/
|
|
function isAccessorKind(node) {
|
|
return node.kind === "get" || node.kind === "set";
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not a given node is an argument of a specified method call.
|
|
* @param {ASTNode} node A node to check.
|
|
* @param {number} index An expected index of the node in arguments.
|
|
* @param {string} object An expected name of the object of the method.
|
|
* @param {string} property An expected name of the method.
|
|
* @returns {boolean} `true` if the node is an argument of the specified method call.
|
|
*/
|
|
function isArgumentOfMethodCall(node, index, object, property) {
|
|
const parent = node.parent;
|
|
|
|
return (
|
|
parent.type === "CallExpression" &&
|
|
astUtils.isSpecificMemberAccess(parent.callee, object, property) &&
|
|
parent.arguments[index] === node
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not a given node is a property descriptor.
|
|
* @param {ASTNode} node A node to check.
|
|
* @returns {boolean} `true` if the node is a property descriptor.
|
|
*/
|
|
function isPropertyDescriptor(node) {
|
|
|
|
// Object.defineProperty(obj, "foo", {set: ...})
|
|
if (isArgumentOfMethodCall(node, 2, "Object", "defineProperty") ||
|
|
isArgumentOfMethodCall(node, 2, "Reflect", "defineProperty")
|
|
) {
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Object.defineProperties(obj, {foo: {set: ...}})
|
|
* Object.create(proto, {foo: {set: ...}})
|
|
*/
|
|
const grandparent = node.parent.parent;
|
|
|
|
return grandparent.type === "ObjectExpression" && (
|
|
isArgumentOfMethodCall(grandparent, 1, "Object", "create") ||
|
|
isArgumentOfMethodCall(grandparent, 1, "Object", "defineProperties")
|
|
);
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "suggestion",
|
|
|
|
docs: {
|
|
description: "Enforce getter and setter pairs in objects and classes",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/accessor-pairs"
|
|
},
|
|
|
|
schema: [{
|
|
type: "object",
|
|
properties: {
|
|
getWithoutSet: {
|
|
type: "boolean",
|
|
default: false
|
|
},
|
|
setWithoutGet: {
|
|
type: "boolean",
|
|
default: true
|
|
},
|
|
enforceForClassMembers: {
|
|
type: "boolean",
|
|
default: true
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}],
|
|
|
|
messages: {
|
|
missingGetterInPropertyDescriptor: "Getter is not present in property descriptor.",
|
|
missingSetterInPropertyDescriptor: "Setter is not present in property descriptor.",
|
|
missingGetterInObjectLiteral: "Getter is not present for {{ name }}.",
|
|
missingSetterInObjectLiteral: "Setter is not present for {{ name }}.",
|
|
missingGetterInClass: "Getter is not present for class {{ name }}.",
|
|
missingSetterInClass: "Setter is not present for class {{ name }}."
|
|
}
|
|
},
|
|
create(context) {
|
|
const config = context.options[0] || {};
|
|
const checkGetWithoutSet = config.getWithoutSet === true;
|
|
const checkSetWithoutGet = config.setWithoutGet !== false;
|
|
const enforceForClassMembers = config.enforceForClassMembers !== false;
|
|
const sourceCode = context.sourceCode;
|
|
|
|
/**
|
|
* Reports the given node.
|
|
* @param {ASTNode} node The node to report.
|
|
* @param {string} messageKind "missingGetter" or "missingSetter".
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function report(node, messageKind) {
|
|
if (node.type === "Property") {
|
|
context.report({
|
|
node,
|
|
messageId: `${messageKind}InObjectLiteral`,
|
|
loc: astUtils.getFunctionHeadLoc(node.value, sourceCode),
|
|
data: { name: astUtils.getFunctionNameWithKind(node.value) }
|
|
});
|
|
} else if (node.type === "MethodDefinition") {
|
|
context.report({
|
|
node,
|
|
messageId: `${messageKind}InClass`,
|
|
loc: astUtils.getFunctionHeadLoc(node.value, sourceCode),
|
|
data: { name: astUtils.getFunctionNameWithKind(node.value) }
|
|
});
|
|
} else {
|
|
context.report({
|
|
node,
|
|
messageId: `${messageKind}InPropertyDescriptor`
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reports each of the nodes in the given list using the same messageId.
|
|
* @param {ASTNode[]} nodes Nodes to report.
|
|
* @param {string} messageKind "missingGetter" or "missingSetter".
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function reportList(nodes, messageKind) {
|
|
for (const node of nodes) {
|
|
report(node, messageKind);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks accessor pairs in the given list of nodes.
|
|
* @param {ASTNode[]} nodes The list to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkList(nodes) {
|
|
const accessors = [];
|
|
let found = false;
|
|
|
|
for (let i = 0; i < nodes.length; i++) {
|
|
const node = nodes[i];
|
|
|
|
if (isAccessorKind(node)) {
|
|
|
|
// Creates a new `AccessorData` object for the given getter or setter node.
|
|
const name = astUtils.getStaticPropertyName(node);
|
|
const key = (name !== null) ? name : sourceCode.getTokens(node.key);
|
|
|
|
// Merges the given `AccessorData` object into the given accessors list.
|
|
for (let j = 0; j < accessors.length; j++) {
|
|
const accessor = accessors[j];
|
|
|
|
if (areEqualKeys(accessor.key, key)) {
|
|
accessor.getters.push(...node.kind === "get" ? [node] : []);
|
|
accessor.setters.push(...node.kind === "set" ? [node] : []);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
accessors.push({
|
|
key,
|
|
getters: node.kind === "get" ? [node] : [],
|
|
setters: node.kind === "set" ? [node] : []
|
|
});
|
|
}
|
|
found = false;
|
|
}
|
|
}
|
|
|
|
for (const { getters, setters } of accessors) {
|
|
if (checkSetWithoutGet && setters.length && !getters.length) {
|
|
reportList(setters, "missingGetter");
|
|
}
|
|
if (checkGetWithoutSet && getters.length && !setters.length) {
|
|
reportList(getters, "missingSetter");
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks accessor pairs in an object literal.
|
|
* @param {ASTNode} node `ObjectExpression` node to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkObjectLiteral(node) {
|
|
checkList(node.properties.filter(p => p.type === "Property"));
|
|
}
|
|
|
|
/**
|
|
* Checks accessor pairs in a property descriptor.
|
|
* @param {ASTNode} node Property descriptor `ObjectExpression` node to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkPropertyDescriptor(node) {
|
|
const namesToCheck = new Set(node.properties
|
|
.filter(p => p.type === "Property" && p.kind === "init" && !p.computed)
|
|
.map(({ key }) => key.name));
|
|
|
|
const hasGetter = namesToCheck.has("get");
|
|
const hasSetter = namesToCheck.has("set");
|
|
|
|
if (checkSetWithoutGet && hasSetter && !hasGetter) {
|
|
report(node, "missingGetter");
|
|
}
|
|
if (checkGetWithoutSet && hasGetter && !hasSetter) {
|
|
report(node, "missingSetter");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks the given object expression as an object literal and as a possible property descriptor.
|
|
* @param {ASTNode} node `ObjectExpression` node to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkObjectExpression(node) {
|
|
checkObjectLiteral(node);
|
|
if (isPropertyDescriptor(node)) {
|
|
checkPropertyDescriptor(node);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks the given class body.
|
|
* @param {ASTNode} node `ClassBody` node to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkClassBody(node) {
|
|
const methodDefinitions = node.body.filter(m => m.type === "MethodDefinition");
|
|
|
|
checkList(methodDefinitions.filter(m => m.static));
|
|
checkList(methodDefinitions.filter(m => !m.static));
|
|
}
|
|
|
|
const listeners = {};
|
|
|
|
if (checkSetWithoutGet || checkGetWithoutSet) {
|
|
listeners.ObjectExpression = checkObjectExpression;
|
|
if (enforceForClassMembers) {
|
|
listeners.ClassBody = checkClassBody;
|
|
}
|
|
}
|
|
|
|
return listeners;
|
|
}
|
|
};
|