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/**
* @fileoverview require default case in switch statements
* @author Aliaksei Shytkin
*/
"use strict";
var COMMENT_VALUE = "no default";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Shortcut to get last element of array
* @param {*[]} collection Array
* @returns {*} Last element
*/
function last(collection) {
return collection[collection.length - 1];
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"SwitchStatement": function(node) {
if (!node.cases.length) {
// skip check of empty switch because there is no easy way
// to extract comments inside it now
return;
}
var hasDefault = node.cases.some(function(v) {
return v.test === null;
});
if (!hasDefault) {
var comment;
var comments;
var lastCase = last(node.cases);
comments = context.getComments(lastCase).trailing;
if (comments.length) {
comment = last(comments);
}
if (!comment || comment.value.trim() !== COMMENT_VALUE) {
context.report(node, "Expected a default case.");
}
}
}
};
};
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