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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.MethodNode;
import org.zwobble.couscous.ast.ReturnNode;
import org.zwobble.couscous.ast.TernaryConditionalNode;
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.LiteralNode.literal;
import static org.zwobble.couscous.ast.MethodCallNode.methodCall;
import static org.zwobble.couscous.ast.StaticMethodCallNode.staticMethodCall;
import static org.zwobble.couscous.values.PrimitiveValues.value;
import lombok.val;
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 whenConditionIsTrueThenValueOfConditionalTernaryIsTrueBranch() {
val result = evalExpression(new TernaryConditionalNode(literal(true), literal("T"), literal("F")));
assertEquals(value("T"), result);
}
@Test
public void whenConditionIsFalseThenValueOfConditionalTernaryIsFalseBranch() {
val result = evalExpression(new TernaryConditionalNode(literal(false), literal("T"), literal("F")));
assertEquals(value("F"), result);
}
@Test
public void canCallMethodWithNoArgumentsOnBuiltin() {
val result = evalExpression(methodCall(
literal("hello"),
"length",
asList(),
IntegerValue.REF));
assertEquals(value(5), result);
}
@Test
public void canCallMethodWithArgumentsOnBuiltin() {
val result = evalExpression(methodCall(
literal("hello"),
"substring",
asList(literal(1), literal(4)),
StringValue.REF));
assertEquals(value("ell"), result);
}
@Test
public void canCallBuiltinStaticMethod() {
val result = evalExpression(
staticMethodCall("java.lang.Integer", "parseInt", literal("42")));
assertEquals(value(42), result);
}
@Test
public void canCallStaticMethodFromUserDefinedStaticMethod() {
val classNode = ClassNode.builder("com.example.Example")
.method(MethodNode.staticMethod("main")
.statement(new ReturnNode(staticMethodCall("java.lang.Integer", "parseInt", literal("42"))))
.build())
.build();
val result = evalExpression(asList(classNode),
staticMethodCall("com.example.Example", "main"));
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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