69 lines
1.9 KiB
JavaScript
69 lines
1.9 KiB
JavaScript
var traverse = require("../traverse");
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var util = require("../util");
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var b = require("ast-types").builders;
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var _ = require("lodash");
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exports.VariableDeclaration = function (node, parent, file) {
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if (node.kind !== "let") return;
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node.kind = "var";
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var ids = {};
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_.each(node.declarations, function (declar) {
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_.each(util.getIds(declar.id), function (id) {
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ids[id] = b.identifier(file.generateUid(id));
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});
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});
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var replaceId = function (node, parent) {
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// not an identifier so we have no use for this node
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if (node.type !== "Identifier") return;
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// not a let reference
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var id = ids[node.name];
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if (!id) return;
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// we're a property key
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if (parent.type === "Property" && parent.key === node) return;
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if (parent.type !== "MemberExpression") {
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// we aren't in a member expression
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return id;
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} else if (parent.type === "MemberExpression" && parent.property === node && parent.computed) {
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// we're in a member expression but we're a computed property so we're referenced
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return id;
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} else if (parent.type === "MemberExpression" && parent.object === node) {
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// we're in a member expression and we're the object so we're referenced
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return id;
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}
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};
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var replace = function (node, parent) {
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if (_.contains(traverse.FUNCTION_TYPES, node.type)) {
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var letReferences = [];
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traverse(node, function (node, parent) {
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var id = replaceId(node, parent);
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if (id) letReferences.push(id);
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return id;
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});
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if (letReferences.length) {
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return b.callExpression(
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b.functionExpression(null, letReferences,
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b.blockStatement([
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b.returnStatement(node)
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]
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)
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), letReferences)
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} else {
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return false;
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}
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}
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return replaceId(node, parent);
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};
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traverse(parent, replace);
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};
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