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package org.zwobble.couscous.backends.csharp.primitives;
import com.google.common.collect.ImmutableMap;
import org.zwobble.couscous.ast.ExpressionNode;
import org.zwobble.couscous.ast.MethodCallNode;
import org.zwobble.couscous.ast.Operator;
import org.zwobble.couscous.ast.Receiver;
import org.zwobble.couscous.ast.visitors.NodeTransformer;
import org.zwobble.couscous.types.ScalarType;
import org.zwobble.couscous.types.Types;
import org.zwobble.couscous.values.InternalCouscousValue;
import java.util.Map;
import java.util.Optional;
import static org.zwobble.couscous.ast.FieldAccessNode.fieldAccess;
import static org.zwobble.couscous.ast.MethodCallNode.methodCall;
import static org.zwobble.couscous.ast.MethodCallNode.staticMethodCall;
import static org.zwobble.couscous.ast.OperationNode.operation;
import static org.zwobble.couscous.ast.Operations.boxInt;
import static org.zwobble.couscous.ast.Operations.integerSubtract;
import static org.zwobble.couscous.types.Types.erasure;
import static org.zwobble.couscous.util.Casts.tryCast;
import static org.zwobble.couscous.util.ExtraLists.list;
public class CsharpPrimitiveMethods {
public static final NodeTransformer TRANSFORMER = NodeTransformer.builder()
.transformExpression(CsharpPrimitiveMethods::transformExpression)
.build();
private static Optional<ExpressionNode> transformExpression(ExpressionNode expression) {
return tryCast(MethodCallNode.class, expression)
.flatMap(CsharpPrimitiveMethods::transformMethodCall);
}
private static Optional<ExpressionNode> transformMethodCall(MethodCallNode call) {
return call.getReceiver().accept(new Receiver.Mapper<Optional<ExpressionNode>>() {
@Override
public Optional<ExpressionNode> visit(ExpressionNode receiver) {
return CsharpPrimitiveMethods.getPrimitiveMethod(erasure(receiver.getType()), call.getMethodName())
.map(method -> new PrimitiveInstanceMethodCall(method, receiver, call.getArguments()));
}
@Override
public Optional<ExpressionNode> visit(ScalarType receiver) {
return CsharpPrimitiveMethods.getPrimitiveStaticMethod(receiver, call.getMethodName())
.map(method -> new PrimitiveStaticMethodCall(method, call.getArguments()));
}
});
}
private static final Map<String, PrimitiveInstanceMethod> BOOLEAN_METHODS;
static {
ImmutableMap.Builder<String, PrimitiveInstanceMethod> methods = ImmutableMap.builder();
BOOLEAN_METHODS = methods.build();
}
private static final Map<String, PrimitiveInstanceMethod> BOXED_INT_METHODS;
static {
ImmutableMap.Builder<String, PrimitiveInstanceMethod> methods = ImmutableMap.builder();
methods.put("toString", new PrimitiveInstanceMethod(
(receiver, arguments) -> methodCall(
receiver,
"ToString",
list(),
Types.STRING
),
Types.STRING
));
BOXED_INT_METHODS = methods.build();
}
private static final Map<String, PrimitiveInstanceMethod> STRING_METHODS;
static {
ImmutableMap.Builder<String, PrimitiveInstanceMethod> methods = ImmutableMap.builder();
methods.put("length", new PrimitiveInstanceMethod(
(receiver, arguments) -> fieldAccess(receiver, "Length", Types.INT),
Types.INT
));
methods.put("substring", new PrimitiveInstanceMethod(
(receiver, arguments) -> {
ExpressionNode startIndex = arguments.get(0);
if (arguments.size() == 1) {
return methodCall(
receiver,
"Substring",
list(startIndex),
Types.STRING
);
} else {
ExpressionNode endIndex = arguments.get(1);
ExpressionNode length = integerSubtract(endIndex, startIndex);
// TODO: handle length going beyond end-of-string
return methodCall(
receiver,
"Substring",
list(startIndex, length),
Types.STRING
);
}
},
Types.STRING
));
methods.put("toLowerCase", new PrimitiveInstanceMethod(
(receiver, arguments) -> methodCall(
receiver,
"ToLower",
list(),
Types.STRING
),
Types.STRING
));
methods.put("equals", new PrimitiveInstanceMethod(
(receiver, arguments) -> methodCall(
receiver,
"Equals",
arguments,
Types.STRING
),
Types.STRING
));
STRING_METHODS = methods.build();
}
private static final Map<ScalarType, Map<String, PrimitiveInstanceMethod>> METHODS =
ImmutableMap.<ScalarType, Map<String, PrimitiveInstanceMethod>>builder()
.put(Types.BOOLEAN, BOOLEAN_METHODS)
.put(Types.STRING, STRING_METHODS)
.put(Types.BOXED_INT, BOXED_INT_METHODS)
.build();
private static final Map<String, PrimitiveStaticMethod> STATIC_INT_METHODS =
ImmutableMap.<String, PrimitiveStaticMethod>builder()
.put("toString", new PrimitiveStaticMethod(
arguments -> methodCall(
arguments.get(0),
"ToString",
list(),
Types.STRING
),
Types.STRING
))
.put("parseInt", new PrimitiveStaticMethod(
arguments -> {
if (arguments.size() == 1 || arguments.size() == 2) {
return staticMethodCall(
ScalarType.topLevel("System.Convert"),
"ToInt32",
arguments,
ScalarType.topLevel("int")
);
} else {
throw new IllegalArgumentException();
}
},
Types.INT
))
.put("valueOf", new PrimitiveStaticMethod(
arguments -> boxInt(arguments.get(0)),
Types.BOXED_INT
))
.build();
private static final Map<String, PrimitiveStaticMethod> STATIC_STRING_METHODS =
ImmutableMap.<String, PrimitiveStaticMethod>builder()
.put("join", new PrimitiveStaticMethod(
arguments -> staticMethodCall(
ScalarType.topLevel("java.lang.String"),
"join",
arguments,
Types.STRING
),
Types.STRING
))
.build();
private static final Map<String, PrimitiveStaticMethod> STATIC_INTERNAL_METHODS =
ImmutableMap.<String, PrimitiveStaticMethod>builder()
.put("same", new PrimitiveStaticMethod(
arguments -> operation(Operator.EQUALS, arguments, Types.BOOLEAN),
Types.BOOLEAN
))
.build();
private static final Map<ScalarType, Map<String, PrimitiveStaticMethod>> STATIC_METHODS =
ImmutableMap.<ScalarType, Map<String, PrimitiveStaticMethod>>builder()
.put(Types.BOXED_INT, STATIC_INT_METHODS)
.put(Types.STRING, STATIC_STRING_METHODS)
.put(InternalCouscousValue.REF, STATIC_INTERNAL_METHODS)
.build();
private static Optional<PrimitiveInstanceMethod> getPrimitiveMethod(ScalarType type, String methodName) {
return Optional.ofNullable(METHODS.get(type))
.flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
}
private static Optional<PrimitiveStaticMethod> getPrimitiveStaticMethod(ScalarType type, String methodName) {
return Optional.ofNullable(STATIC_METHODS.get(type))
.flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
}
}
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