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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.ast.TypeName;
import org.zwobble.couscous.backends.python.ast.PythonExpressionNode;
import org.zwobble.couscous.values.IntegerValue;
import org.zwobble.couscous.values.StringValue;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;
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.PythonGetSliceNode.pythonGetSlice;
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) ->
pythonGetSlice(receiver, arguments))
.build();
private static final Map<String, PrimitiveMethodGenerator> INT_METHODS;
static {
ImmutableMap.Builder<String, PrimitiveMethodGenerator> methods = ImmutableMap.builder();
addMethod(methods, "add", "__add__");
addMethod(methods, "subtract", "__sub__");
addMethod(methods, "multiply", "__mul__");
methods.put("divide", (receiver, arguments) ->
pythonCall(
internalReference("_div_round_to_zero"),
asList(receiver, arguments.get(0))));
methods.put("mod", (receiver, arguments) ->
pythonCall(
internalReference("_mod_round_to_zero"),
asList(receiver, arguments.get(0))));
addMethod(methods, "equals", "__eq__");
addMethod(methods, "greaterThan", "__gt__");
addMethod(methods, "greaterThanOrEqual", "__ge__");
addMethod(methods, "lessThan", "__lt__");
addMethod(methods, "lessThanOrEqual", "__le__");
INT_METHODS = methods.build();
}
private static PythonExpressionNode internalReference(String name) {
return pythonAttributeAccess(pythonVariableReference("_couscous"), name);
}
private static void addMethod(
Builder<String, PrimitiveMethodGenerator> methods,
String methodName,
String pythonMethodName) {
methods.put(methodName, (receiver, arguments) ->
pythonCall(
pythonAttributeAccess(receiver, pythonMethodName),
arguments));
}
private static final Map<TypeName, Map<String, PrimitiveMethodGenerator>> METHODS =
ImmutableMap.<TypeName, Map<String, PrimitiveMethodGenerator>>builder()
.put(StringValue.REF, STRING_METHODS)
.put(IntegerValue.REF, INT_METHODS)
.build();
public static boolean isPrimitive(TypeName type) {
return METHODS.containsKey(type);
}
public static Optional<PrimitiveMethodGenerator> getPrimitiveMethod(TypeName 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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