Method _consumeInterpolation

packages/compiler/src/ml_parser/lexer.ts:1264–1323

* Consume a block of text that has been interpreted as an Angular interpolation. * * @param interpolationTokenType the type of the interpolation token to generate. * @param interpolationStart a cursor that points to the start of this interpolation. * @param prematureEndPredicate a functi

(
    interpolationTokenType: TokenType,
    interpolationStart: CharacterCursor,
    prematureEndPredicate: (() => boolean) | null,
  )

   *     an end to the interpolation before its normal closing marker.
   */
  private _consumeInterpolation(
    interpolationTokenType: TokenType,
    interpolationStart: CharacterCursor,
    prematureEndPredicate: (() => boolean) | null,
  ): void {
    const parts: string[] = [];
    this._beginToken(interpolationTokenType, interpolationStart);
    parts.push(INTERPOLATION.start);

    // Find the end of the interpolation, ignoring content inside quotes.
    const expressionStart = this._cursor.clone();
    let inQuote: number | null = null;
    let inComment = false;
    while (
      this._cursor.peek() !== chars.$EOF &&
      (prematureEndPredicate === null || !prematureEndPredicate())
    ) {
      const current = this._cursor.clone();

      if (this._isTagStart()) {
        // We are starting what looks like an HTML element in the middle of this interpolation.
        // Reset the cursor to before the `<` character and end the interpolation token.
        // (This is actually wrong but here for backward compatibility).
        this._cursor = current;
        parts.push(this._getProcessedChars(expressionStart, current));
        this._endToken(parts);
        return;
      }

      if (inQuote === null) {
        if (this._attemptStr(INTERPOLATION.end)) {
          // We are not in a string, and we hit the end interpolation marker
          parts.push(this._getProcessedChars(expressionStart, current));
          parts.push(INTERPOLATION.end);
          this._endToken(parts);
          return;
        } else if (this._attemptStr('//')) {
          // Once we are in a comment we ignore any quotes
          inComment = true;
        }
      }

      const char = this._cursor.peek();
      this._cursor.advance();
      if (char === chars.$BACKSLASH) {
        // Skip the next character because it was escaped.
        this._cursor.advance();
      } else if (char === inQuote) {
        // Exiting the current quoted string
        inQuote = null;
      } else if (!inComment && inQuote === null && chars.isQuote(char)) {
        // Entering a new quoted string
        inQuote = char;
      }
    }

    // We hit EOF without finding a closing interpolation marker
    parts.push(this._getProcessedChars(expressionStart, this._cursor));