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/**
* @fileoverview Rule to flag trailing commas in object literals.
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
//-------------------------------------------------------------------------
// Helpers
//-------------------------------------------------------------------------
function checkForTrailingComma(node) {
var items = node.properties || node.elements,
length = items.length,
lastItem, penultimateToken;
if (length) {
lastItem = items[length - 1];
if (lastItem) {
penultimateToken = context.getLastToken(node, 1);
if (penultimateToken.value === ",") {
context.report(lastItem, penultimateToken.loc.start, "Trailing comma.");
}
}
}
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"ObjectExpression": checkForTrailingComma,
"ArrayExpression": checkForTrailingComma
};
};
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