public void getLanguagesToInject()

in flex/src/com/intellij/javascript/flex/mxml/MxmlLanguageInjector.java [41:137]
86 lines of code
34 McCabe index (conditional complexity)

  public void getLanguagesToInject(@NotNull MultiHostRegistrar registrar, @NotNull PsiElement host) {
    if (!host.getContainingFile().getLanguage().isKindOf(MxmlLanguage.INSTANCE)) {
      return;
    }

    if (host instanceof XmlAttributeValue) {
      final PsiElement attribute = host.getParent();
      final PsiElement tag = attribute.getParent();

      if (attribute instanceof XmlAttribute && tag instanceof XmlTag) {
        if (isFxPrivateTag((XmlTag)tag) || isInsideFxPrivateTag((XmlTag)tag)) {
          return;
        }

        if (host.getTextLength() == 0) return;

        @NonNls String attrName = ((XmlAttribute)attribute).getName();

        if ("implements".equals(attrName)) {
          TextRange range = new TextRange(1, host.getTextLength() - 1);
          registrar.startInjecting(FlexSupportLoader.ECMA_SCRIPT_L4)
            .addPlace("class Foo implements ", " {}", (PsiLanguageInjectionHost)host, range)
            .doneInjecting();
        }
        else if ("source".equals(attrName) &&
                 FlexPredefinedTagNames.BINDING.equals(((XmlTag)tag).getLocalName()) &&
                 FlexSupportLoader.isLanguageNamespace(((XmlTag)tag).getNamespace()) &&
                 !host.textContains('{')) {
          TextRange range = new TextRange(1, host.getTextLength() - 1);
          registrar.startInjecting(FlexSupportLoader.ECMA_SCRIPT_L4)
            .addPlace(FUNCTION_CALL_PREFIX, FUNCTION_CALL_SUFFIX, (PsiLanguageInjectionHost)host, range)
            .doneInjecting();
        }
        else if (attrName.equals("expression") &&
                 "RegExpValidator".equals(((XmlTag)tag).getLocalName()) &&
                 Holder.regexpLanguage != null
          ) {
          String hostText = host.getText();
          int startPos = hostText.indexOf('/');
          int endPos = hostText.lastIndexOf('/');

          if (startPos != -1) {
            if (endPos > startPos) {
              TextRange range = new TextRange(startPos + 1, endPos);
              registrar.startInjecting(Holder.regexpLanguage)
                .addPlace(null, null, (PsiLanguageInjectionHost)host, range)
                .doneInjecting();
            }
          }
          else {
            injectInMxmlFile(registrar, host, ((XmlAttribute)attribute).getDescriptor(), (XmlTag)tag);
          }
        }
        else {
          injectInMxmlFile(registrar, host, ((XmlAttribute)attribute).getDescriptor(), (XmlTag)tag);
        }
      }
    }
    else if (host instanceof XmlText) {
      final PsiElement _tag = host.getParent();
      if (_tag instanceof XmlTag tag) {

        if (isFxPrivateTag(tag) || isInsideFxPrivateTag(tag) || tag instanceof HtmlTag) {
          return;
        }

        final @NonNls String localName = tag.getLocalName();

        if ((XmlBackedJSClassImpl.SCRIPT_TAG_NAME.equals(localName) ||
             FlexPredefinedTagNames.METADATA.equals(localName)) &&
            tag.getAttributeValue("source") == null) {
          JSInXmlLanguagesInjector.injectToXmlText(registrar, host, FlexSupportLoader.ECMA_SCRIPT_L4, null, null);
        }
        else if (FlexPredefinedTagNames.STYLE.equals(localName) && FlexUtils.isMxmlNs(tag.getNamespace()) && Holder.cssLanguage != null) {
          JSInXmlLanguagesInjector.injectToXmlText(registrar, host, Holder.cssLanguage, null, null);
        }
        else if (tag.getSubTags().length == 0) {
          injectInMxmlFile(registrar, host, tag.getDescriptor(), tag);
        }
      }
    }
    else if (host instanceof XmlComment) {
      final String text = host.getText();
      final String marker = "<!---";
      if (text.startsWith(marker)) {
        final String marker2 = "-->";
        int end = text.endsWith(marker2) ? host.getTextLength() - marker2.length() : host.getTextLength();
        //int nestedCommentStart = text.indexOf(marker, marker.length());
        //if (nestedCommentStart != -1) end = nestedCommentStart;
        if (end < marker.length()) return;
        TextRange range = new TextRange(marker.length(), end);
        registrar.startInjecting(FlexSupportLoader.ECMA_SCRIPT_L4)
          .addPlace("/***", "*/", (PsiLanguageInjectionHost)host, range)
          .doneInjecting();
      }
    }
  }