Sha256: ce74bafdc0159f6bf07451dda8285ab9e34de072f8dc58cd230e6bad51316c0d
Contents?: true
Size: 1.96 KB
Versions: 45
Compression:
Stored size: 1.96 KB
Contents
/**
* @fileoverview Rule to flag the generator functions that does not have yield.
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require generator functions to contain `yield`",
category: "ECMAScript 6",
recommended: false
},
schema: []
},
create: function(context) {
var stack = [];
/**
* If the node is a generator function, start counting `yield` keywords.
* @param {Node} node - A function node to check.
* @returns {void}
*/
function beginChecking(node) {
if (node.generator) {
stack.push(0);
}
}
/**
* If the node is a generator function, end counting `yield` keywords, then
* reports result.
* @param {Node} node - A function node to check.
* @returns {void}
*/
function endChecking(node) {
if (!node.generator) {
return;
}
var countYield = stack.pop();
if (countYield === 0 && node.body.body.length > 0) {
context.report(
node,
"This generator function does not have 'yield'.");
}
}
return {
FunctionDeclaration: beginChecking,
"FunctionDeclaration:exit": endChecking,
FunctionExpression: beginChecking,
"FunctionExpression:exit": endChecking,
// Increases the count of `yield` keyword.
YieldExpression: function() {
/* istanbul ignore else */
if (stack.length > 0) {
stack[stack.length - 1] += 1;
}
}
};
}
};
Version data entries
45 entries across 45 versions & 2 rubygems