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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.Operator;
import org.zwobble.couscous.ast.TypeName;
import org.zwobble.couscous.backends.python.ast.PythonExpressionNode;
import org.zwobble.couscous.backends.python.ast.PythonNotNode;
import org.zwobble.couscous.values.BooleanValue;
import org.zwobble.couscous.values.IntegerValue;
import org.zwobble.couscous.values.InternalCouscousValue;
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.PythonBinaryOperation.pythonIs;
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> BOOLEAN_METHODS =
ImmutableMap.<String, PrimitiveMethodGenerator>builder()
.put("negate", (receiver, arguments) ->
PythonNotNode.pythonNot(receiver))
.build();
private static final Map<String, PrimitiveMethodGenerator> INT_METHODS;
static {
ImmutableMap.Builder<String, PrimitiveMethodGenerator> methods = ImmutableMap.builder();
addMethod(methods, Operator.ADD.getMethodName(), "__add__");
addMethod(methods, Operator.SUBTRACT.getMethodName(), "__sub__");
addMethod(methods, Operator.MULTIPLY.getMethodName(), "__mul__");
methods.put(Operator.DIVIDE.getMethodName(), (receiver, arguments) ->
pythonCall(
internalReference("_div_round_to_zero"),
asList(receiver, arguments.get(0))));
methods.put(Operator.MOD.getMethodName(), (receiver, arguments) ->
pythonCall(
internalReference("_mod_round_to_zero"),
asList(receiver, arguments.get(0))));
addMethod(methods, Operator.EQUALS.getMethodName(), "__eq__");
addMethod(methods, Operator.GREATER_THAN.getMethodName(), "__gt__");
addMethod(methods, Operator.GREATER_THAN_OR_EQUAL.getMethodName(), "__ge__");
addMethod(methods, Operator.LESS_THAN.getMethodName(), "__lt__");
addMethod(methods, Operator.LESS_THAN_OR_EQUAL.getMethodName(), "__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(BooleanValue.REF, BOOLEAN_METHODS)
.put(IntegerValue.REF, INT_METHODS)
.build();
private static final Map<String, PrimitiveStaticMethodGenerator> INTERNAL_METHODS =
ImmutableMap.<String, PrimitiveStaticMethodGenerator>builder()
.put("same", arguments -> pythonIs(arguments.get(0), arguments.get(1)))
.build();
private static final Map<TypeName, Map<String, PrimitiveStaticMethodGenerator>> STATIC_METHODS =
ImmutableMap.<TypeName, Map<String, PrimitiveStaticMethodGenerator>>builder()
.put(InternalCouscousValue.REF, INTERNAL_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);
}
public static Optional<PrimitiveStaticMethodGenerator> getPrimitiveStaticMethod(TypeName type, String methodName) {
return Optional.ofNullable(STATIC_METHODS.get(type))
.flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
}
@FunctionalInterface
public interface PrimitiveStaticMethodGenerator {
PythonExpressionNode generate(List<PythonExpressionNode> arguments);
}
}
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