Method _consumeDirective

packages/compiler/src/ml_parser/lexer.ts:1325–1381

(start: CharacterCursor, nameStart: CharacterCursor)

  }

  private _consumeDirective(start: CharacterCursor, nameStart: CharacterCursor) {
    this._requireCharCode(chars.$AT);

    // Skip over the @ since it's not part of the name.
    this._cursor.advance();

    // Capture the rest of the name.
    while (isSelectorlessNameChar(this._cursor.peek())) {
      this._cursor.advance();
    }

    // Capture the opening token.
    this._beginToken(TokenType.DIRECTIVE_NAME, start);
    const name = this._cursor.getChars(nameStart);
    this._endToken([name]);
    this._attemptCharCodeUntilFn(isNotWhitespace);

    // Optionally there might be attributes bound to the specific directive.
    // Stop parsing if there's no opening character for them.
    if (this._cursor.peek() !== chars.$LPAREN) {
      return;
    }

    this._openDirectiveCount++;
    this._beginToken(TokenType.DIRECTIVE_OPEN);
    this._cursor.advance();
    this._endToken([]);
    this._attemptCharCodeUntilFn(isNotWhitespace);

    // Capture all the attributes until we hit a closing paren.
    while (!isAttributeTerminator(this._cursor.peek()) && this._cursor.peek() !== chars.$RPAREN) {
      this._consumeAttribute();
    }

    // Trim any trailing whitespace.
    this._attemptCharCodeUntilFn(isNotWhitespace);
    this._openDirectiveCount--;

    if (this._cursor.peek() !== chars.$RPAREN) {
      // Stop parsing, instead of throwing, if we've hit the end of the tag.
      // This can be handled better later when turning the tokens into AST.
      if (this._cursor.peek() === chars.$GT || this._cursor.peek() === chars.$SLASH) {
        return;
      }

      throw this._createError(
        _unexpectedCharacterErrorMsg(this._cursor.peek()),
        this._cursor.getSpan(start),
      );
    }

    // Capture the closing token.
    this._beginToken(TokenType.DIRECTIVE_CLOSE);
    this._cursor.advance();
    this._endToken([]);
    this._attemptCharCodeUntilFn(isNotWhitespace);
  }