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package org.zwobble.couscous.tests.backends.csharp;
import com.eclipsesource.json.Json;
import com.eclipsesource.json.JsonObject;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.google.common.collect.Ordering;
import org.hamcrest.Matchers;
import org.zwobble.couscous.Backend;
import org.zwobble.couscous.ast.LiteralNode;
import org.zwobble.couscous.ast.MethodSignature;
import org.zwobble.couscous.ast.TypeNode;
import org.zwobble.couscous.backends.csharp.CsharpCodeGenerator;
import org.zwobble.couscous.backends.csharp.CsharpSerializer;
import org.zwobble.couscous.tests.MethodRunner;
import org.zwobble.couscous.tests.util.processes.ExecutionResult;
import org.zwobble.couscous.tests.util.processes.Processes;
import org.zwobble.couscous.types.ScalarType;
import org.zwobble.couscous.types.Type;
import org.zwobble.couscous.types.Types;
import org.zwobble.couscous.util.ExtraLists;
import org.zwobble.couscous.values.PrimitiveValue;
import org.zwobble.couscous.values.PrimitiveValues;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;
import java.util.List;
import static java.lang.Integer.parseInt;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.zwobble.couscous.ast.MethodCallNode.staticMethodCall;
import static org.zwobble.couscous.tests.util.ExtraFiles.deleteRecursively;
import static org.zwobble.couscous.util.ExtraLists.eagerMap;
import static org.zwobble.couscous.util.ExtraLists.list;
import static org.zwobble.couscous.values.PrimitiveValues.value;
public class CsharpMethodRunner implements MethodRunner {
static final String NAMESPACE = "ExampleProject.Couscous";
@Override
public PrimitiveValue runMethod(List<TypeNode> classNodes, ScalarType className, String methodName, List<PrimitiveValue> arguments, Type returnType) {
try {
Path directoryPath = Files.createTempDirectory(null);
Backend compiler = new CsharpTestBackend(directoryPath, NAMESPACE);
try {
compiler.compile(classNodes);
return runFunction(directoryPath, className, methodName, arguments, returnType);
} finally {
deleteRecursively(directoryPath.toFile());
}
} catch (final java.lang.Throwable $ex) {
throw new RuntimeException($ex);
}
}
public static PrimitiveValue runFunction(
Path workingDirectory,
ScalarType className,
String methodName,
List<PrimitiveValue> arguments,
Type returnType)
throws IOException, InterruptedException
{
MethodSignature signature = new MethodSignature(
methodName,
list(),
eagerMap(arguments, argument -> argument.getType()),
returnType);
String csharpMethodName = CsharpCodeGenerator.NAMING.methodName(signature);
String value = CsharpSerializer.serialize(
staticMethodCall(
ScalarType.topLevel(NAMESPACE + "." + className.getQualifiedName()),
csharpMethodName,
eagerMap(arguments, LiteralNode::literal),
returnType));
boolean isVoid = returnType.equals(Types.VOID);
String body = isVoid
? value + ";"
: "var value = " + value + ";" +
" System.Console.WriteLine(value.GetType());" +
" System.Console.WriteLine(value);";
String program =
"public class MethodRunnerExample { " +
" public static void Main() { " +
" " + body +
" }" +
"}";
Files.write(workingDirectory.resolve("MethodRunnerExample.cs"), list(program));
String output = executeSource(
findCsharpFiles(workingDirectory),
workingDirectory
);
if (isVoid) {
return PrimitiveValues.UNIT;
} else {
return readPrimitive(output);
}
}
private static String executeSource(List<String> paths, Path workingDirectory) throws IOException, InterruptedException {
// TODO: find cache directory properly
Path cacheDirectory = Paths.get(System.getProperty("user.home"), ".cache/couscous/tests/csharp");
String hash = hashFiles(paths);
Path cacheResult = cacheDirectory.resolve(hash);
if (!cacheResult.toFile().exists()) {
cacheDirectory.toFile().mkdirs();
String executablePath = compileFiles(paths, workingDirectory);
ExecutionResult result = Processes.run(list("mono", executablePath));
writeExecuteResult(cacheResult, result);
}
ExecutionResult result = readExecutionResult(cacheResult);
result.assertSuccess();
return result.getStdout();
}
private static ExecutionResult readExecutionResult(Path path) throws IOException {
JsonObject result = Json.parse(new FileReader(path.toFile())).asObject();
return new ExecutionResult(
result.get("exitCode").asInt(),
result.get("stdout").asString(),
result.get("stderr").asString()
);
}
private static void writeExecuteResult(Path path, ExecutionResult result) throws IOException {
JsonObject json = Json.object()
.add("exitCode", result.getExitCode())
.add("stdout", result.getStdout())
.add("stderr", result.getStderr());
Files.write(path, list(json.toString()));
}
private static String compileFiles(List<String> paths, Path workingDirectory) throws IOException, InterruptedException {
Path executablePath = workingDirectory.resolve("Program.cs");
ExecutionResult result = Processes.run(
ExtraLists.concat(
list("mcs", "-out:" + executablePath),
paths
),
workingDirectory
);
result.assertSuccess();
return executablePath.toString();
}
private static String hashFiles(List<String> paths) throws IOException {
try {
MessageDigest digest = MessageDigest.getInstance("SHA-1");
for (String path : Ordering.natural().immutableSortedCopy(paths)) {
byte[] bytes = Files.readAllBytes(Paths.get(path));
digest.update(bytes);
}
return bytesToHex(digest.digest());
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
private static String bytesToHex(byte[] hash) {
Formatter formatter = new Formatter();
for (byte b : hash) {
formatter.format("%02x", b);
}
return formatter.toString();
}
private static List<String> findCsharpFiles(Path directoryPath) throws IOException {
return ImmutableList.copyOf(
Iterators.transform(
Iterators.filter(
Files.newDirectoryStream(directoryPath).iterator(),
path -> path.toFile().isFile() && path.toString().endsWith(".cs")),
path -> path.toString()));
}
private static final String NAMESPACE_PREFIX = NAMESPACE + ".";
private static PrimitiveValue readPrimitive(String output) {
String[] lines = output.split("[\\r\\n]+");
String type = lines[0];
String value = lines[1];
switch (type) {
case "System.Int32":
return value(parseInt(value));
case "System.String":
return value(value);
case "System.Boolean":
return value(value.equals("True"));
case "System.MonoType":
case "System.RuntimeType":
if (value.equals("System.String")) {
return value(Types.STRING);
} else {
assertThat(value, Matchers.startsWith(NAMESPACE_PREFIX));
return value(ScalarType.topLevel(value.substring(NAMESPACE_PREFIX.length())));
}
default:
throw new RuntimeException("Unhandled type: " + type);
}
}
}
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