generateForAnnotatedElement method
Future
generateForAnnotatedElement(
- Element element,
- ConstantReader annotation,
- BuildStep buildStep
Implement to return source code to generate for element
.
This method is invoked based on finding elements annotated with an
instance of T
. The annotation
is provided as a ConstantReader
.
Supported return values include a single String or multiple String instances within an Iterable or Stream. It is also valid to return a Future of String, Iterable, or Stream.
Implementations should return null
when no content is generated. Empty
or whitespace-only String instances are also ignored.
Implementation
@override
Future generateForAnnotatedElement(
Element element, ConstantReader annotation, BuildStep buildStep) async {
var variableElement = element as VariableElement;
if (!(variableElement.isConst &&
variableElement.type.toString() == 'String')) {
throw 'variable: ${variableElement.displayName} must be a constant String';
}
String content = await loadAsset(buildStep, annotation);
return Future.value(
"const String \$${variableElement.name}Content = r'''${content}''';");
}