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/**
* @fileoverview Rule to require grouped accessor pairs in object literals and classes
* @author Milos Djermanovic
*/
"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";
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "require grouped accessor pairs in object literals and classes",
recommended: false,
url: "https://eslint.org/docs/rules/grouped-accessor-pairs"
},
schema: [
{
enum: ["anyOrder", "getBeforeSet", "setBeforeGet"]
}
],
messages: {
notGrouped: "Accessor pair {{ formerName }} and {{ latterName }} should be grouped.",
invalidOrder: "Expected {{ latterName }} to be before {{ formerName }}."
}
},
create(context) {
const order = context.options[0] || "anyOrder";
const sourceCode = context.getSourceCode();
/**
* Reports the given accessor pair.
* @param {string} messageId messageId to report.
* @param {ASTNode} formerNode getter/setter node that is defined before `latterNode`.
* @param {ASTNode} latterNode getter/setter node that is defined after `formerNode`.
* @returns {void}
* @private
*/
function report(messageId, formerNode, latterNode) {
context.report({
node: latterNode,
messageId,
loc: astUtils.getFunctionHeadLoc(latterNode.value, sourceCode),
data: {
formerName: astUtils.getFunctionNameWithKind(formerNode.value),
latterName: astUtils.getFunctionNameWithKind(latterNode.value)
}
});
}
/**
* Creates a new `AccessorData` object for the given getter or setter node.
* @param {ASTNode} node A getter or setter node.
* @returns {AccessorData} New `AccessorData` object that contains the given node.
* @private
*/
function createAccessorData(node) {
const name = astUtils.getStaticPropertyName(node);
const key = (name !== null) ? name : sourceCode.getTokens(node.key);
return {
key,
getters: node.kind === "get" ? [node] : [],
setters: node.kind === "set" ? [node] : []
};
}
/**
* Merges the given `AccessorData` object into the given accessors list.
* @param {AccessorData[]} accessors The list to merge into.
* @param {AccessorData} accessorData The object to merge.
* @returns {AccessorData[]} The same instance with the merged object.
* @private
*/
function mergeAccessorData(accessors, accessorData) {
const equalKeyElement = accessors.find(a => areEqualKeys(a.key, accessorData.key));
if (equalKeyElement) {
equalKeyElement.getters.push(...accessorData.getters);
equalKeyElement.setters.push(...accessorData.setters);
} else {
accessors.push(accessorData);
}
return accessors;
}
/**
* Checks accessor pairs in the given list of nodes.
* @param {ASTNode[]} nodes The list to check.
* @param {Function} shouldCheck – Predicate that returns `true` if the node should be checked.
* @returns {void}
* @private
*/
function checkList(nodes, shouldCheck) {
const accessors = nodes
.filter(shouldCheck)
.filter(isAccessorKind)
.map(createAccessorData)
.reduce(mergeAccessorData, []);
for (const { getters, setters } of accessors) {
// Don't report accessor properties that have duplicate getters or setters.
if (getters.length === 1 && setters.length === 1) {
const [getter] = getters,
[setter] = setters,
getterIndex = nodes.indexOf(getter),
setterIndex = nodes.indexOf(setter),
formerNode = getterIndex < setterIndex ? getter : setter,
latterNode = getterIndex < setterIndex ? setter : getter;
if (Math.abs(getterIndex - setterIndex) > 1) {
report("notGrouped", formerNode, latterNode);
} else if (
(order === "getBeforeSet" && getterIndex > setterIndex) ||
(order === "setBeforeGet" && getterIndex < setterIndex)
) {
report("invalidOrder", formerNode, latterNode);
}
}
}
}
return {
ObjectExpression(node) {
checkList(node.properties, n => n.type === "Property");
},
ClassBody(node) {
checkList(node.body, n => n.type === "MethodDefinition" && !n.static);
checkList(node.body, n => n.type === "MethodDefinition" && n.static);
}
};
}
};
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