Merge pull request #8289 from valtech-nyc/implement-smart-pipeline-in-parser

Implement Smart Pipeline proposal in @babel/parser

packages/babel-parser/src/tokenizer/state.js

@@ -6,7 +6,7 @@ import { Position } from "../util/location";
 
 import { types as ct, type TokContext } from "./context";
 import type { Token } from "./index";
-import { types as tt, type TokenType } from "./types";
+import { types as tt, type TokenType, type TopicContextState } from "./types";
 
 export default class State {
   init(options: Options, input: string): void {
@@ -26,6 +26,7 @@ export default class State {
     this.maybeInArrowParameters = false;
     this.inGenerator = false;
     this.inAsync = false;
+    this.inPipeline = false;
     this.inPropertyName = false;
     this.inType = false;
     this.inClassProperty = false;
@@ -33,6 +34,12 @@ export default class State {
     this.hasFlowComment = false;
     this.isIterator = false;
 
+    // Used by smartPipelines.
+    this.topicContext = {
+      maxNumOfResolvableTopics: 0,
+      maxTopicIndex: null,
+    };
+
     this.classLevel = 0;
 
     this.labels = [];
@@ -104,6 +111,7 @@ export default class State {
   inGenerator: boolean;
   inMethod: boolean | N.MethodKind;
   inAsync: boolean;
+  inPipeline: boolean;
   inType: boolean;
   noAnonFunctionType: boolean;
   inPropertyName: boolean;
@@ -111,6 +119,9 @@ export default class State {
   hasFlowComment: boolean;
   isIterator: boolean;
 
+  // For the smartPipelines plugin:
+  topicContext: TopicContextState;
+
   // Check whether we are in a (nested) class or not.
   classLevel: number;