@Override
public void processNull(
TemplateExecutionEnvironment environment,
SNodeReference templateSwitch,
TemplateContext context) {
SNode generatorMessage = RuleUtil.getSwitch_NullInputMessage(mySwitch);
if (generatorMessage != null) {
GeneratorUtilEx.processGeneratorMessage(
generatorMessage,
context.getInput(),
templateSwitch.resolve(MPSModuleRepository.getInstance()),
null,
environment.getGenerator());
}
}
@Override
public Collection<SNode> applyDefault(
TemplateExecutionEnvironment environment,
SNodeReference templateSwitch,
String mappingName,
TemplateContext context)
throws GenerationException {
SNode defaultConsequence = RuleUtil.getSwitchDefaultConsequence(mySwitch);
if (defaultConsequence == null) {
SNodeReference modifies = getModifiesSwitch();
if (modifies == null) {
return null;
}
TemplateSwitchMapping switchMapping = environment.getGenerator().getSwitch(modifies);
if (switchMapping == null) {
return null;
}
return switchMapping.applyDefault(environment, templateSwitch, mappingName, context);
}
List<SNode> collection = new ArrayList<SNode>();
try {
List<Pair<SNode, String>> nodeAndMappingNamePairs =
GeneratorUtilEx.getTemplateNodesFromRuleConsequence(
defaultConsequence,
context.getInput(),
templateSwitch.resolve(MPSModuleRepository.getInstance()),
environment.getReductionContext(),
environment.getGenerator());
if (nodeAndMappingNamePairs == null) {
environment
.getGenerator()
.showErrorMessage(
context.getInput(),
templateSwitch.resolve(MPSModuleRepository.getInstance()),
defaultConsequence,
"error processing $SWITCH$/default");
return null;
}
for (Pair<SNode, String> nodeAndMappingNamePair : nodeAndMappingNamePairs) {
SNode altTemplateNode = nodeAndMappingNamePair.o1;
String innerMappingName =
nodeAndMappingNamePair.o2 != null ? nodeAndMappingNamePair.o2 : mappingName;
try {
TemplateProcessor templateProcessor =
new TemplateProcessor(environment.getGenerator(), environment.getReductionContext());
collection.addAll(templateProcessor.apply(innerMappingName, altTemplateNode, context));
} catch (TemplateProcessingFailureException e) {
environment
.getGenerator()
.showErrorMessage(
context.getInput(),
templateSwitch.resolve(MPSModuleRepository.getInstance()),
"error processing template fragment");
}
}
} catch (AbandonRuleInputException e) {
// it's ok. just ignore
}
return collection;
}