Context Class — react Architecture

Source Code

compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/CodegenReactiveFunction.ts lines 434–489

class Context {
  env: Environment;
  fnName: string;
  #nextCacheIndex: number = 0;
  /**
   * Tracks which named variables have been declared to dedupe declarations,
   * so this uses DeclarationId instead of IdentifierId
   */
  #declarations: Set<DeclarationId> = new Set();
  temp: Temporaries;
  errors: CompilerError = new CompilerError();
  objectMethods: Map<IdentifierId, ObjectMethod> = new Map();
  uniqueIdentifiers: Set<string>;
  fbtOperands: Set<IdentifierId>;
  synthesizedNames: Map<string, ValidIdentifierName> = new Map();

  constructor(
    env: Environment,
    fnName: string,
    uniqueIdentifiers: Set<string>,
    fbtOperands: Set<IdentifierId>,
    temporaries: Temporaries | null = null,
  ) {
    this.env = env;
    this.fnName = fnName;
    this.uniqueIdentifiers = uniqueIdentifiers;
    this.fbtOperands = fbtOperands;
    this.temp = temporaries !== null ? new Map(temporaries) : new Map();
  }
  get nextCacheIndex(): number {
    return this.#nextCacheIndex++;
  }

  declare(identifier: Identifier): void {
    this.#declarations.add(identifier.declarationId);
  }

  hasDeclared(identifier: Identifier): boolean {
    return this.#declarations.has(identifier.declarationId);
  }

  synthesizeName(name: string): ValidIdentifierName {
    const previous = this.synthesizedNames.get(name);
    if (previous !== undefined) {
      return previous;
    }
    let validated = makeIdentifierName(name).value;
    let index = 0;
    while (this.uniqueIdentifiers.has(validated)) {
      validated = makeIdentifierName(`${name}${index++}`).value;
    }
    this.uniqueIdentifiers.add(validated);
    this.synthesizedNames.set(name, validated);
    return validated;
  }
}