source: trip-planner-front/node_modules/@webassemblyjs/ast/esm/traverse.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1import { createPath } from "./node-path";
2import { unionTypesMap, nodeAndUnionTypes } from "./nodes"; // recursively walks the AST starting at the given node. The callback is invoked for
3// and object that has a 'type' property.
4
5function walk(context, callback) {
6 var stop = false;
7
8 function innerWalk(context, callback) {
9 if (stop) {
10 return;
11 }
12
13 var node = context.node;
14
15 if (node === undefined) {
16 console.warn("traversing with an empty context");
17 return;
18 }
19
20 if (node._deleted === true) {
21 return;
22 }
23
24 var path = createPath(context);
25 callback(node.type, path);
26
27 if (path.shouldStop) {
28 stop = true;
29 return;
30 }
31
32 Object.keys(node).forEach(function (prop) {
33 var value = node[prop];
34
35 if (value === null || value === undefined) {
36 return;
37 }
38
39 var valueAsArray = Array.isArray(value) ? value : [value];
40 valueAsArray.forEach(function (childNode) {
41 if (typeof childNode.type === "string") {
42 var childContext = {
43 node: childNode,
44 parentKey: prop,
45 parentPath: path,
46 shouldStop: false,
47 inList: Array.isArray(value)
48 };
49 innerWalk(childContext, callback);
50 }
51 });
52 });
53 }
54
55 innerWalk(context, callback);
56}
57
58var noop = function noop() {};
59
60export function traverse(node, visitors) {
61 var before = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : noop;
62 var after = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : noop;
63 Object.keys(visitors).forEach(function (visitor) {
64 if (!nodeAndUnionTypes.includes(visitor)) {
65 throw new Error("Unexpected visitor ".concat(visitor));
66 }
67 });
68 var context = {
69 node: node,
70 inList: false,
71 shouldStop: false,
72 parentPath: null,
73 parentKey: null
74 };
75 walk(context, function (type, path) {
76 if (typeof visitors[type] === "function") {
77 before(type, path);
78 visitors[type](path);
79 after(type, path);
80 }
81
82 var unionTypes = unionTypesMap[type];
83
84 if (!unionTypes) {
85 throw new Error("Unexpected node type ".concat(type));
86 }
87
88 unionTypes.forEach(function (unionType) {
89 if (typeof visitors[unionType] === "function") {
90 before(unionType, path);
91 visitors[unionType](path);
92 after(unionType, path);
93 }
94 });
95 });
96}
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