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package org.zwobble.couscous.tests;
import org.junit.Test;
import org.zwobble.couscous.ast.ClassNode;
import org.zwobble.couscous.ast.LiteralNode;
import org.zwobble.couscous.ast.MethodNode;
import org.zwobble.couscous.ast.ReturnNode;
import org.zwobble.couscous.values.PrimitiveValue;
import org.zwobble.couscous.values.PrimitiveValues;
import org.zwobble.couscous.values.StringValue;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;
import static org.zwobble.couscous.ast.AssignmentNode.assign;
import static org.zwobble.couscous.ast.ExpressionStatementNode.expressionStatement;
import static org.zwobble.couscous.ast.FormalArgumentNode.formalArg;
import static org.zwobble.couscous.ast.LiteralNode.literal;
import static org.zwobble.couscous.ast.LocalVariableDeclarationNode.localVariableDeclaration;
import static org.zwobble.couscous.ast.MethodNode.staticMethod;
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;
import lombok.val;
public abstract class BackendMethodTests {
@Test
public void methodWithNoStatementsReturnsUnit() {
val method = staticMethod("hello");
val result = runMethod(method);
assertEquals(PrimitiveValues.UNIT, result);
}
@Test
public void canReturnLiteralValue() {
val method = staticMethod("hello")
.statement(new ReturnNode(literal("hello, world!")));
val result = runMethod(method);
assertEquals(value("hello, world!"), result);
}
@Test
public void canPassValueToMethod() {
val arg = formalArg(var(ANY_ID, "x", StringValue.REF));
val method = staticMethod("hello")
.argument(arg)
.statement(new ReturnNode(reference(arg)));
val result = runMethod(method, value("hello, world!"));
assertEquals(value("hello, world!"), result);
}
@Test
public void canReassignValueToArgument() {
val arg = formalArg(var(ANY_ID, "x", StringValue.REF));
val method = staticMethod("hello")
.argument(arg)
.statement(expressionStatement(assign(reference(arg), LiteralNode.literal("[updated value]"))))
.statement(new ReturnNode(reference(arg)));
val result = runMethod(method, value("[initial value]"));
assertEquals(value("[updated value]"), result);
}
@Test
public void canDeclareVariable() {
val localVariableDeclaration = localVariableDeclaration(
ANY_ID, "x", StringValue.REF, LiteralNode.literal("[initial value]"));
val method = staticMethod("hello")
.statement(localVariableDeclaration)
.statement(new ReturnNode(reference(localVariableDeclaration)));
val result = runMethod(method);
assertEquals(value("[initial value]"), result);
}
@Test
public void canDeclareVariableAndThenAssignValues() {
val localVariableDeclaration = localVariableDeclaration(
ANY_ID, "x", StringValue.REF, LiteralNode.literal("[initial value]"));
val method = staticMethod("hello")
.statement(localVariableDeclaration)
.statement(expressionStatement(assign(reference(localVariableDeclaration), LiteralNode.literal("[updated value]"))))
.statement(new ReturnNode(reference(localVariableDeclaration)));
val result = runMethod(method);
assertEquals(value("[updated value]"), result);
}
protected PrimitiveValue runMethod(MethodNode.MethodNodeBuilder methodBuilder, PrimitiveValue... arguments) {
val method = methodBuilder.build();
val className = "com.example.Program";
val classNode = ClassNode.builder(className)
.method(method)
.build();
val runner = buildMethodRunner();
return runner.runMethod(
asList(classNode),
classNode.getName(),
method.getName(),
asList(arguments));
}
protected abstract MethodRunner buildMethodRunner();
}
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