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add util.isReferenced to check if a node is directly referenced

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Sebastian McKenzie
2014-10-13 05:34:18 +11:00
parent 3bc5373bc2
commit 737c349775
1 changed files with 18 additions and 0 deletions
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18
lib/6to5/util.js
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@@ -150,6 +150,24 @@ exports.template = function (name, nodes, keepExpression) {
}
};
exports.isReferenced = function (node, parent) {
// we're a property key
if (parent.type === "Property" && parent.key === node) return false;
var isMemberExpression = parent.type === "MemberExpression";
// we're in a member expression and we're the computed property so we're referenced
var isComputedProperty = isMemberExpression && parent.property === node && parent.computed;
// we're in a member expression and we're the object so we're referenced
var isObject = isMemberExpression && parent.object === node;
// we are referenced
if (!isMemberExpression || isComputedProperty || isObject) return true;
return false;
};
exports.codeFrame = function (lines, lineNumber, colNumber) {
colNumber = Math.max(colNumber, 0);