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package org.zwobble.couscous.tests;
import java.util.List;
import org.junit.Test;
import org.zwobble.couscous.ast.ClassNode;
import org.zwobble.couscous.ast.ExpressionNode;
import org.zwobble.couscous.ast.FormalArgumentNode;
import org.zwobble.couscous.ast.MethodCallNode;
import org.zwobble.couscous.values.BooleanValue;
import org.zwobble.couscous.values.IntegerValue;
import org.zwobble.couscous.values.PrimitiveValue;
import org.zwobble.couscous.values.StringValue;
import com.google.common.collect.ImmutableList;
import static java.util.Arrays.asList;
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.ReturnNode.returns;
import static org.zwobble.couscous.ast.StaticMethodCallNode.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.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)));
}
@Test
public void canEvaluateOperationsOnIntegers() {
assertEquals(
value(3),
evalExpression(methodCall(literal(1), "add", asList(literal(2)), IntegerValue.REF)));
assertEquals(
value(-1),
evalExpression(methodCall(literal(1), "subtract", asList(literal(2)), IntegerValue.REF)));
assertEquals(
value(2),
evalExpression(methodCall(literal(1), "multiply", asList(literal(2)), IntegerValue.REF)));
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(methodCall(literal(1), "greaterThan", asList(literal(2)), BooleanValue.REF)));
assertEquals(
value(false),
evalExpression(methodCall(literal(1), "greaterThanOrEqual", asList(literal(2)), BooleanValue.REF)));
assertEquals(
value(true),
evalExpression(methodCall(literal(1), "lessThan", asList(literal(2)), BooleanValue.REF)));
assertEquals(
value(true),
evalExpression(methodCall(literal(1), "lessThanOrEqual", asList(literal(2)), BooleanValue.REF)));
}
private MethodCallNode divideIntegers(int left, int right) {
return methodCall(literal(left), "divide", asList(literal(right)), IntegerValue.REF);
}
private MethodCallNode modIntegers(int left, int right) {
return methodCall(literal(left), "mod", asList(literal(right)), IntegerValue.REF);
}
@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",
asList(),
IntegerValue.REF));
assertEquals(value(5), result);
}
@Test
public void canCallMethodWithArgumentsOnBuiltin() {
PrimitiveValue result = evalExpression(methodCall(
literal("hello"),
"substring",
asList(literal(1), literal(4)),
StringValue.REF));
assertEquals(value("ell"), result);
}
@Test
public void canCallBuiltinStaticMethod() {
PrimitiveValue result = evalExpression(
staticMethodCall("java.lang.Integer", "parseInt", literal("42")));
assertEquals(value(42), result);
}
@Test
public void canCallStaticMethodFromUserDefinedStaticMethod() {
ClassNode classNode = ClassNode.builder("com.example.Example")
.staticMethod("main", method -> method
.statement(returns(staticMethodCall("java.lang.Integer", "parseInt", literal("42")))))
.build();
PrimitiveValue result = evalExpression(asList(classNode),
staticMethodCall("com.example.Example", "main"));
assertEquals(value(42), result);
}
@Test
public void canCallInstanceMethodWithNoArgumentsOnUserDefinedClass() {
ClassNode classNode = ClassNode.builder("com.example.Example")
.method("main", method -> method
.statement(returns(literal(42))))
.build();
PrimitiveValue result = evalExpression(asList(classNode),
methodCall(constructorCall(classNode.getName(), asList()), "main", asList(), IntegerValue.REF));
assertEquals(value(42), result);
}
@Test
public void canCallInstanceMethodWithArgumentsOnUserDefinedClass() {
FormalArgumentNode argument = formalArg(var(ANY_ID, "x", IntegerValue.REF));
ClassNode classNode = ClassNode.builder("com.example.Example")
.method("main", method -> method
.argument(argument)
.statement(returns(reference(argument))))
.build();
PrimitiveValue result = evalExpression(
asList(classNode),
methodCall(
constructorCall(classNode.getName(), asList()),
"main",
asList(literal(42)),
IntegerValue.REF));
assertEquals(value(42), result);
}
@Test
public void constructorIsExecutedOnConstruction() {
FormalArgumentNode argument = formalArg(var(ANY_ID, "x", IntegerValue.REF));
ClassNode classNode = ClassNode.builder("com.example.Example")
.field("value", IntegerValue.REF)
.constructor(constructor -> constructor
.argument(argument)
.statement(assignStatement(
fieldAccess(constructor.thisReference(), "value", IntegerValue.REF),
reference(argument))))
.method("main", method -> method
.statement(returns(
fieldAccess(method.thisReference(), "value", IntegerValue.REF))))
.build();
PrimitiveValue result = evalExpression(
asList(classNode),
methodCall(
constructorCall(classNode.getName(), asList(literal(42))),
"main",
asList(),
IntegerValue.REF));
assertEquals(value(42), result);
}
protected PrimitiveValue evalExpression(ExpressionNode expression) {
return evalExpression(ImmutableList.of(), expression);
}
protected abstract PrimitiveValue evalExpression(
List<ClassNode> classes,
ExpressionNode expression);
}
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