Method _consumeLetDeclaration

packages/compiler/src/ml_parser/lexer.ts:411–449

(start: CharacterCursor)

  }

  private _consumeLetDeclaration(start: CharacterCursor) {
    this._requireStr('@let');
    this._beginToken(TokenType.LET_START, start);

    // Require at least one white space after the `@let`.
    if (chars.isWhitespace(this._cursor.peek())) {
      this._attemptCharCodeUntilFn(isNotWhitespace);
    } else {
      const token = this._endToken([this._cursor.getChars(start)]);
      token.type = TokenType.INCOMPLETE_LET;
      return;
    }

    const startToken = this._endToken([this._getLetDeclarationName()]);

    // Skip over white space before the equals character.
    this._attemptCharCodeUntilFn(isNotWhitespace);

    // Expect an equals sign.
    if (!this._attemptCharCode(chars.$EQ)) {
      startToken.type = TokenType.INCOMPLETE_LET;
      return;
    }

    // Skip spaces after the equals.
    this._attemptCharCodeUntilFn((code) => isNotWhitespace(code) && !chars.isNewLine(code));
    this._consumeLetDeclarationValue();

    // Terminate the `@let` with a semicolon.
    const endChar = this._cursor.peek();
    if (endChar === chars.$SEMICOLON) {
      this._beginToken(TokenType.LET_END);
      this._cursor.advance();
      this._endToken([]);
    } else {
      startToken.type = TokenType.INCOMPLETE_LET;
      startToken.sourceSpan = this._cursor.getSpan(start);
    }
  }

  private _getLetDeclarationName(): string {
    const nameCursor = this._cursor.clone();