Make printing more robust to manually created glimmer nodes

Fixes ember-template-lint#586

Previously, calling print on node that came from our parse(), but was
not the top-level node, would cause infinite recursion. (It would have
NodeInfo, but not a registered parse result).

This fixes the infinite loop, by just storing a reference to the
top-level parse result in the node info, and using that.

Importantly, this successfully preserves formatting for any sub-nodes we
did parse ourselves, or any user-created nodes that require custom
printing.

src/index.ts

@@ -3,26 +3,22 @@ import type { ASTv1 as AST, NodeVisitor } from '@glimmer/syntax';
 import ParseResult, { NodeInfo } from './parse-result';
 import { builders } from './custom-nodes';
 
-const PARSE_RESULT_FOR = new WeakMap<AST.Node, ParseResult>();
 const NODE_INFO = new WeakMap<AST.Node, NodeInfo>();
 
 export function parse(template: string): AST.Template {
-  const result = new ParseResult(template, NODE_INFO);
-
-  PARSE_RESULT_FOR.set(result.ast, result);
-
-  return result.ast;
+  return new ParseResult(template, NODE_INFO).ast;
 }
 
 export function print(ast: AST.Node): string {
-  const parseResult = PARSE_RESULT_FOR.get(ast);
-
-  // TODO: write a test for this case
-  if (parseResult === undefined) {
-    return glimmerPrint(ast, { entityEncoding: 'raw' });
-  }
-
-  return parseResult.print();
+  return glimmerPrint(ast, {
+    entityEncoding: 'raw',
+    override: (ast) => {
+      let info = NODE_INFO.get(ast);
+      if (info) {
+        return info.parse_result.print(ast);
+      }
+    },
+  });
 }
 
 export interface Syntax {

src/parse-result.test.ts

@@ -36,6 +36,23 @@ describe('ember-template-recast', function () {
       expect(print(ast)).toEqual(`foo`);
     });
 
+    test('wrapping a parsed node (which uses custom formatting) with a raw node', function () {
+      // Ensuring fix for GH#586
+      // (infinite recursion when printing custom nodes containing parsed nodes)
+      // plays nicely with custom printing from GH#653
+      // (specifying quoteType on custom nodes, adds a printing override)
+      let template = `<Foo @class='a {{b}} c' />`;
+      let original = parse(template);
+
+      let raw_wrapping_ast = builders.template([
+        builders.element('div', {
+          children: original.body,
+        }),
+      ]);
+
+      expect(print(raw_wrapping_ast)).toEqual(`<div><Foo @class='a {{b}} c' /></div>`);
+    });
+
     test('changing an element to a void element does not print closing tag', function () {
       let template = `<div data-foo="{{something}}"></div>`;
 

src/parse-result.ts

@@ -115,6 +115,7 @@ export interface NodeInfo {
   node: AST.Node;
   original: AST.Node;
   source: string;
+  parse_result: ParseResult;
 
   hadHash?: boolean;
   hadParams?: boolean;
@@ -156,6 +157,7 @@ export default class ParseResult {
       node,
       original: JSON.parse(JSON.stringify(node)),
       source: this.sourceForLoc(node.loc),
+      parse_result: this,
     };
 
     this.nodeInfo.set(node, nodeInfo);