no-dupe-class-members.js
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/**
* @fileoverview A rule to disallow duplicate name in class members.
* @author Toru Nagashima
* @copyright 2015 Toru Nagashima. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var stack = [];
/**
* Gets state of a given member name.
* @param {string} name - A name of a member.
* @param {boolean} isStatic - A flag which specifies that is a static member.
* @returns {object} A state of a given member name.
* - retv.init {boolean} A flag which shows the name is declared as normal member.
* - retv.get {boolean} A flag which shows the name is declared as getter.
* - retv.set {boolean} A flag which shows the name is declared as setter.
*/
function getState(name, isStatic) {
var stateMap = stack[stack.length - 1];
var key = "$" + name; // to avoid "__proto__".
if (!stateMap[key]) {
stateMap[key] = {
nonStatic: {init: false, get: false, set: false},
static: {init: false, get: false, set: false}
};
}
return stateMap[key][isStatic ? "static" : "nonStatic"];
}
return {
// Initializes the stack of state of member declarations.
"Program": function() {
stack = [];
},
// Initializes state of member declarations for the class.
"ClassBody": function() {
stack.push(Object.create(null));
},
// Disposes the state for the class.
"ClassBody:exit": function() {
stack.pop();
},
// Reports the node if its name has been declared already.
"MethodDefinition": function(node) {
if (node.computed) {
return;
}
var name = node.key.name;
var state = getState(name, node.static);
var isDuplicate = false;
if (node.kind === "get") {
isDuplicate = (state.init || state.get);
state.get = true;
} else if (node.kind === "set") {
isDuplicate = (state.init || state.set);
state.set = true;
} else {
isDuplicate = (state.init || state.get || state.set);
state.init = true;
}
if (isDuplicate) {
context.report(node, "Duplicate name \"{{name}}\".", {name: name});
}
}
};
};
module.exports.schema = [];