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author | 2020-11-16 00:10:28 +0100 | |
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committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/@webassemblyjs/ast/esm/traverse.js | |
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api, login, auth
Diffstat (limited to 'node_modules/@webassemblyjs/ast/esm/traverse.js')
-rw-r--r-- | node_modules/@webassemblyjs/ast/esm/traverse.js | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/ast/esm/traverse.js b/node_modules/@webassemblyjs/ast/esm/traverse.js new file mode 100644 index 0000000..328dc09 --- /dev/null +++ b/node_modules/@webassemblyjs/ast/esm/traverse.js @@ -0,0 +1,96 @@ +import { createPath } from "./node-path"; +import { unionTypesMap, nodeAndUnionTypes } from "./nodes"; // recursively walks the AST starting at the given node. The callback is invoked for +// and object that has a 'type' property. + +function walk(context, callback) { + var stop = false; + + function innerWalk(context, callback) { + if (stop) { + return; + } + + var node = context.node; + + if (node === undefined) { + console.warn("traversing with an empty context"); + return; + } + + if (node._deleted === true) { + return; + } + + var path = createPath(context); + callback(node.type, path); + + if (path.shouldStop) { + stop = true; + return; + } + + Object.keys(node).forEach(function (prop) { + var value = node[prop]; + + if (value === null || value === undefined) { + return; + } + + var valueAsArray = Array.isArray(value) ? value : [value]; + valueAsArray.forEach(function (childNode) { + if (typeof childNode.type === "string") { + var childContext = { + node: childNode, + parentKey: prop, + parentPath: path, + shouldStop: false, + inList: Array.isArray(value) + }; + innerWalk(childContext, callback); + } + }); + }); + } + + innerWalk(context, callback); +} + +var noop = function noop() {}; + +export function traverse(node, visitors) { + var before = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : noop; + var after = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : noop; + Object.keys(visitors).forEach(function (visitor) { + if (!nodeAndUnionTypes.includes(visitor)) { + throw new Error("Unexpected visitor ".concat(visitor)); + } + }); + var context = { + node: node, + inList: false, + shouldStop: false, + parentPath: null, + parentKey: null + }; + walk(context, function (type, path) { + if (typeof visitors[type] === "function") { + before(type, path); + visitors[type](path); + after(type, path); + } + + var unionTypes = unionTypesMap[type]; + + if (!unionTypes) { + throw new Error("Unexpected node type ".concat(type)); + } + + unionTypes.forEach(function (unionType) { + if (typeof visitors[unionType] === "function") { + before(unionType, path); + visitors[unionType](path); + after(unionType, path); + } + }); + }); +}
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