parse method

@override void parse(BuildMetadata meta)

Parses tree for build ops and text styles.

Implementation

@override
void parse(BuildMetadata meta) {
  switch (meta.element.localName) {
    case kTagIframe:
      meta.register(
        _tagIframe ??= BuildOp(
          // TODO: set debugLabel when our minimum core version >= 1.0
          defaultStyles: (element) {
            // other tags that share the same logic:
            // - IMG
            //
            // consider update them together if this changes
            final attrs = element.attributes;
            final height = attrs[kAttributeIframeHeight];
            final width = attrs[kAttributeIframeWidth];

            return {
              'height': 'auto',
              'min-width': '0px',
              'min-height': '0px',
              'width': 'auto',
              if (height != null) 'height': '${height}px',
              if (width != null) 'width': '${width}px',
            };
          },
          onWidgets: (meta, widgets) {
            if (defaultTargetPlatform != TargetPlatform.android &&
                defaultTargetPlatform != TargetPlatform.iOS &&
                !kIsWeb) {
              // Android & iOS are the webview_flutter's supported platforms
              // Flutter web support is implemented by this package
              // https://pub.dev/packages/webview_flutter/versions/2.0.12
              return widgets;
            }

            final a = meta.element.attributes;
            final src = urlFull(a[kAttributeIframeSrc] ?? '');
            if (src == null) {
              return widgets;
            }

            final height = tryParseDoubleFromMap(a, kAttributeIframeHeight);
            final width = tryParseDoubleFromMap(a, kAttributeIframeWidth);
            final sandbox = a[kAttributeIframeSandbox]?.split(RegExp(r'\s+'));
            final built = buildWebView(
              meta,
              src,
              height: height,
              sandbox: sandbox,
              width: width,
            );
            return listOrNull(built) ?? widgets;
          },
        ),
      );
      break;
  }
  return super.parse(meta);
}