116 lines
3.6 KiB
JavaScript
116 lines
3.6 KiB
JavaScript
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/**
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* @fileoverview A rule to disallow duplicate name in class members.
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* @author Toru Nagashima
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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: "problem",
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docs: {
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description: "disallow duplicate class members",
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category: "ECMAScript 6",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-dupe-class-members"
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},
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schema: [],
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messages: {
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unexpected: "Duplicate name '{{name}}'."
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}
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},
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create(context) {
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let stack = [];
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/**
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* Gets state of a given member name.
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* @param {string} name A name of a member.
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* @param {boolean} isStatic A flag which specifies that is a static member.
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* @returns {Object} A state of a given member name.
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* - retv.init {boolean} A flag which shows the name is declared as normal member.
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* - retv.get {boolean} A flag which shows the name is declared as getter.
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* - retv.set {boolean} A flag which shows the name is declared as setter.
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*/
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function getState(name, isStatic) {
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const stateMap = stack[stack.length - 1];
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const key = `$${name}`; // to avoid "__proto__".
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if (!stateMap[key]) {
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stateMap[key] = {
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nonStatic: { init: false, get: false, set: false },
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static: { init: false, get: false, set: false }
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};
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}
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return stateMap[key][isStatic ? "static" : "nonStatic"];
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}
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/**
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* Gets the name text of a given node.
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* @param {ASTNode} node A node to get the name.
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* @returns {string} The name text of the node.
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*/
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function getName(node) {
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switch (node.type) {
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case "Identifier": return node.name;
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case "Literal": return String(node.value);
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/* istanbul ignore next: syntax error */
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default: return "";
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}
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}
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return {
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// Initializes the stack of state of member declarations.
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Program() {
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stack = [];
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},
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// Initializes state of member declarations for the class.
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ClassBody() {
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stack.push(Object.create(null));
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},
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// Disposes the state for the class.
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"ClassBody:exit"() {
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stack.pop();
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},
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// Reports the node if its name has been declared already.
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MethodDefinition(node) {
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if (node.computed) {
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return;
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}
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const name = getName(node.key);
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const state = getState(name, node.static);
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let isDuplicate = false;
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if (node.kind === "get") {
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isDuplicate = (state.init || state.get);
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state.get = true;
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} else if (node.kind === "set") {
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isDuplicate = (state.init || state.set);
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state.set = true;
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} else {
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isDuplicate = (state.init || state.get || state.set);
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state.init = true;
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}
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if (isDuplicate) {
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context.report({ node, messageId: "unexpected", data: { name } });
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}
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}
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};
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}
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};
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