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79 lines
2.8 KiB
79 lines
2.8 KiB
2 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.convertAst = void 0;
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const ts = require("typescript");
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const util_1 = require("./util");
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/**
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* Takes a `ts.SourceFile` and creates data structures that are easier (or more performant) to traverse.
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* Note that there is only a performance gain if you can reuse these structures. It's not recommended for one-time AST walks.
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*/
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function convertAst(sourceFile) {
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const wrapped = {
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node: sourceFile,
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parent: undefined,
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kind: ts.SyntaxKind.SourceFile,
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children: [],
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next: undefined,
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skip: undefined,
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};
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const flat = [];
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let current = wrapped;
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function collectChildren(node) {
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current.children.push({
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node,
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parent: current,
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kind: node.kind,
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children: [],
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next: undefined,
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skip: undefined,
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});
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}
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const stack = [];
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while (true) {
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if (current.children.length === 0) {
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ts.forEachChild(current.node, collectChildren);
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if (current.children.length === 0) {
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current = current.parent; // nothing to do here, go back to parent
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}
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else {
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// recurse into first child
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const firstChild = current.children[0];
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current.next = firstChild;
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flat.push(firstChild.node);
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if (util_1.isNodeKind(firstChild.kind))
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current = firstChild;
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stack.push(1); // set index in stack so we know where to continue processing children
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}
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}
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else {
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const index = stack[stack.length - 1];
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if (index < current.children.length) { // handles 2nd child to the last
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const currentChild = current.children[index];
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flat.push(currentChild.node);
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let previous = current.children[index - 1];
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while (previous.children.length !== 0) {
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previous.skip = currentChild;
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previous = previous.children[previous.children.length - 1];
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}
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previous.skip = previous.next = currentChild;
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++stack[stack.length - 1];
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if (util_1.isNodeKind(currentChild.kind))
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current = currentChild; // recurse into child
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}
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else {
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// done on this node
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if (stack.length === 1)
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break;
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// remove index from stack and go back to parent
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stack.pop();
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current = current.parent;
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}
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}
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}
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return {
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wrapped,
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flat,
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};
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}
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exports.convertAst = convertAst;
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//# sourceMappingURL=convert-ast.js.map
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