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package org.zwobble.couscous.backends.python;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.zwobble.couscous.backends.python.ast.PythonExpressionNode;
import org.zwobble.couscous.values.StringValue;
import org.zwobble.couscous.values.TypeReference;
import com.google.common.collect.ImmutableMap;
import static java.util.Arrays.asList;
import static org.zwobble.couscous.backends.python.ast.PythonAttributeAccessNode.pythonAttributeAccess;
import static org.zwobble.couscous.backends.python.ast.PythonCallNode.pythonCall;
import static org.zwobble.couscous.backends.python.ast.PythonVariableReferenceNode.pythonVariableReference;
public class PrimitiveMethods {
private static final Map<String, PrimitiveMethodGenerator> STRING_METHODS =
ImmutableMap.<String, PrimitiveMethodGenerator>builder()
.put("length", (receiver, arguments) ->
pythonCall(
pythonVariableReference("len"),
asList(receiver)))
.put("substring", (receiver, arguments) ->
pythonCall(
pythonAttributeAccess(
receiver,
"__getitem__"),
asList(pythonCall(
pythonVariableReference("slice"),
arguments))))
.build();
private static final Map<TypeReference, Map<String, PrimitiveMethodGenerator>> METHODS =
ImmutableMap.<TypeReference, Map<String, PrimitiveMethodGenerator>>builder()
.put(StringValue.REF, STRING_METHODS)
.build();
public static boolean isPrimitive(TypeReference type) {
return METHODS.containsKey(type);
}
public static Optional<PrimitiveMethodGenerator> getPrimitiveMethod(TypeReference type, String methodName) {
return Optional.ofNullable(METHODS.get(type))
.flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
}
@FunctionalInterface
public interface PrimitiveMethodGenerator {
PythonExpressionNode generate(PythonExpressionNode receiver, List<PythonExpressionNode> arguments);
}
}
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