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package org.zwobble.couscous.tests;
import org.junit.Test;
import org.zwobble.couscous.ast.*;
import org.zwobble.couscous.types.ScalarType;
import org.zwobble.couscous.types.Types;
import org.zwobble.couscous.values.PrimitiveValue;
import java.util.Collections;
import java.util.List;
import static org.junit.Assert.assertEquals;
import static org.zwobble.couscous.ast.AssignmentNode.assignStatement;
import static org.zwobble.couscous.ast.ConstructorCallNode.constructorCall;
import static org.zwobble.couscous.ast.FieldAccessNode.fieldAccess;
import static org.zwobble.couscous.ast.FormalArgumentNode.formalArg;
import static org.zwobble.couscous.ast.LiteralNode.literal;
import static org.zwobble.couscous.ast.MethodCallNode.methodCall;
import static org.zwobble.couscous.ast.Operations.*;
import static org.zwobble.couscous.ast.ReturnNode.returns;
import static org.zwobble.couscous.ast.Operations.same;
import static org.zwobble.couscous.ast.MethodCallNode.staticMethodCall;
import static org.zwobble.couscous.ast.TernaryConditionalNode.ternaryConditional;
import static org.zwobble.couscous.ast.VariableDeclaration.var;
import static org.zwobble.couscous.ast.VariableReferenceNode.reference;
import static org.zwobble.couscous.tests.TestIds.ANY_ID;
import static org.zwobble.couscous.util.ExtraLists.list;
import static org.zwobble.couscous.values.PrimitiveValues.value;
public abstract class BackendEvalTests {
@Test
public void canEvaluateLiterals() {
assertEquals(value("hello"), evalExpression(literal("hello")));
assertEquals(value(true), evalExpression(literal(true)));
assertEquals(value(false), evalExpression(literal(false)));
assertEquals(value(42), evalExpression(literal(42)));
assertEquals(value(Types.STRING), evalExpression(literal(Types.STRING)));
}
@Test
public void equalityOnReferenceTypesChecksForIdentity() {
assertEquals(
value(false),
evalExpression(same(
constructorCall(ScalarType.of("java.lang.Object"), Collections.emptyList()),
constructorCall(ScalarType.of("java.lang.Object"), Collections.emptyList()))));
}
@Test
public void canEvaluateOperationsOnBooleans() {
assertEquals(
value(true),
evalExpression(not(literal(false))));
assertEquals(
value(false),
evalExpression(not(literal(true))));
}
@Test
public void canEvaluateOperationsOnIntegers() {
assertEquals(
value(3),
evalExpression(integerAdd(literal(1), literal(2))));
assertEquals(
value(-1),
evalExpression(integerSubtract(literal(1), literal(2))));
assertEquals(
value(2),
evalExpression(integerMultiply(literal(1), literal(2))));
assertEquals(value(0), evalExpression(divideIntegers(1, 2)));
assertEquals(value(1), evalExpression(divideIntegers(10, 6)));
assertEquals(value(-1), evalExpression(divideIntegers(-10, 6)));
assertEquals(value(-1), evalExpression(divideIntegers(10, -6)));
assertEquals(value(1), evalExpression(divideIntegers(-10, -6)));
assertEquals(value(1), evalExpression(modIntegers(1, 2)));
assertEquals(value(4), evalExpression(modIntegers(10, 6)));
assertEquals(value(-4), evalExpression(modIntegers(-10, 6)));
assertEquals(value(4), evalExpression(modIntegers(10, -6)));
assertEquals(value(-4), evalExpression(modIntegers(-10, -6)));
assertEquals(
value(false),
evalExpression(equal(literal(1), literal(2))));
assertEquals(
value(true),
evalExpression(equal(literal(1), literal(1))));
assertEquals(
value(false),
evalExpression(greaterThan(literal(1), literal(2))));
assertEquals(
value(false),
evalExpression(greaterThanOrEqual(literal(1), literal(2))));
assertEquals(
value(true),
evalExpression(lessThan(literal(1), literal(2))));
assertEquals(
value(true),
evalExpression(lessThanOrEqual(literal(1), literal(2))));
}
private ExpressionNode divideIntegers(int left, int right) {
return integerDivide(literal(left), literal(right));
}
private ExpressionNode modIntegers(int left, int right) {
return integerMod(literal(left), literal(right));
}
@Test
public void whenConditionIsTrueThenValueOfConditionalTernaryIsTrueBranch() {
PrimitiveValue result = evalExpression(ternaryConditional(literal(true), literal("T"), literal("F")));
assertEquals(value("T"), result);
}
@Test
public void whenConditionIsFalseThenValueOfConditionalTernaryIsFalseBranch() {
PrimitiveValue result = evalExpression(ternaryConditional(literal(false), literal("T"), literal("F")));
assertEquals(value("F"), result);
}
@Test
public void canCallMethodWithNoArgumentsOnBuiltin() {
PrimitiveValue result = evalExpression(methodCall(
literal("hello"),
"length",
list(),
Types.INT));
assertEquals(value(5), result);
}
@Test
public void canCallMethodWithArgumentsOnBuiltin() {
PrimitiveValue result = evalExpression(methodCall(
literal("hello"),
"substring",
list(literal(1), literal(4)),
Types.STRING));
assertEquals(value("ell"), result);
}
@Test
public void canCallBuiltinStaticMethod() {
PrimitiveValue result = evalExpression(staticMethodCall(
"java.lang.Integer",
"parseInt",
list(literal("42")),
Types.INT));
assertEquals(value(42), result);
}
@Test
public void canCallStaticMethodFromUserDefinedStaticMethod() {
ClassNode classNode = ClassNode.builder("com.example.Example")
.staticMethod("main", method -> method
.returns(Types.INT)
.statement(returns(staticMethodCall(
"java.lang.Integer",
"parseInt",
list(literal("42")),
Types.INT))))
.build();
PrimitiveValue result = evalExpression(list(classNode),
staticMethodCall("com.example.Example", "main", list(), Types.INT));
assertEquals(value(42), result);
}
@Test
public void canCallInstanceMethodWithNoArgumentsOnUserDefinedClass() {
ClassNode classNode = ClassNode.builder("com.example.Example")
.method("main", method -> method
.returns(Types.INT)
.statement(returns(literal(42))))
.build();
PrimitiveValue result = evalExpression(list(classNode),
methodCall(constructorCall(classNode.getName(), list()), "main", list(), Types.INT));
assertEquals(value(42), result);
}
@Test
public void canCallInstanceMethodWithArgumentsOnUserDefinedClass() {
FormalArgumentNode argument = formalArg(var(ANY_ID, "x", Types.INT));
ClassNode classNode = ClassNode.builder("com.example.Example")
.method("main", method -> method
.argument(argument)
.returns(Types.INT)
.statement(returns(reference(argument))))
.build();
PrimitiveValue result = evalExpression(
list(classNode),
methodCall(
constructorCall(classNode.getName(), list()),
"main",
list(literal(42)),
Types.INT));
assertEquals(value(42), result);
}
@Test
public void constructorIsExecutedOnConstruction() {
FormalArgumentNode argument = formalArg(var(ANY_ID, "x", Types.INT));
ClassNode classNode = ClassNode.builder("com.example.Example")
.field("value", Types.INT)
.constructor(constructor -> constructor
.argument(argument)
.statement(assignStatement(
fieldAccess(constructor.thisReference(), "value", Types.INT),
reference(argument))))
.method("main", method -> method
.returns(Types.INT)
.statement(returns(
fieldAccess(method.thisReference(), "value", Types.INT))))
.build();
PrimitiveValue result = evalExpression(
list(classNode),
methodCall(
constructorCall(classNode.getName(), list(literal(42))),
"main",
list(),
Types.INT));
assertEquals(value(42), result);
}
@Test
public void staticConstructorIsExecutedOnReference() {
ScalarType type = ScalarType.of("com.example.Example");
ClassNode classNode = ClassNode.builder(type)
.staticField("value", Types.INT)
.staticConstructor(list(
assignStatement(
fieldAccess(type, "value", Types.INT),
literal(42))))
.build();
PrimitiveValue result = evalExpression(
list(classNode),
fieldAccess(type, "value", Types.INT));
assertEquals(value(42), result);
}
private PrimitiveValue evalExpression(ExpressionNode expression) {
return evalExpression(list(), expression);
}
protected abstract PrimitiveValue evalExpression(
List<TypeNode> classes,
ExpressionNode expression);
}
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