Method visitComment

packages/compiler/src/i18n/extractor_merger.ts:192–243

(comment: html.Comment, context: any)

  }

  visitComment(comment: html.Comment, context: any): any {
    const isOpening = _isOpeningComment(comment);

    if (isOpening && this._isInTranslatableSection) {
      this._reportError(comment, 'Could not start a block inside a translatable section');
      return;
    }

    const isClosing = _isClosingComment(comment);

    if (isClosing && !this._inI18nBlock) {
      this._reportError(comment, 'Trying to close an unopened block');
      return;
    }

    if (!this._inI18nNode && !this._inIcu) {
      if (!this._inI18nBlock) {
        if (isOpening) {
          // deprecated from v5 you should use <ng-container i18n> instead of i18n comments
          if (!i18nCommentsWarned && <any>console && <any>console.warn) {
            i18nCommentsWarned = true;
            const details = comment.sourceSpan.details ? `, ${comment.sourceSpan.details}` : '';
            // TODO(ocombe): use a log service once there is a public one available
            console.warn(
              `I18n comments are deprecated, use an <ng-container> element instead (${comment.sourceSpan.start}${details})`,
            );
          }
          this._inI18nBlock = true;
          this._blockStartDepth = this._depth;
          this._blockChildren = [];
          this._blockMeaningAndDesc = comment
            .value!.replace(_I18N_COMMENT_PREFIX_REGEXP, '')
            .trim();
          this._openTranslatableSection(comment);
        }
      } else {
        if (isClosing) {
          if (this._depth == this._blockStartDepth) {
            this._closeTranslatableSection(comment, this._blockChildren);
            this._inI18nBlock = false;
            const message = this._addMessage(this._blockChildren, this._blockMeaningAndDesc)!;
            // merge attributes in sections
            const nodes = this._translateMessage(comment, message);
            return html.visitAll(this, nodes);
          } else {
            this._reportError(comment, 'I18N blocks should not cross element boundaries');
            return;
          }
        }
      }
    }
  }

  visitText(text: html.Text, context: any): html.Text {
    if (this._isInTranslatableSection) {