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package org.shedlang.compiler;
import org.shedlang.compiler.ast.untyped.UntypedNamespaceNode;
import org.shedlang.compiler.backends.Backend;
import org.shedlang.compiler.config.ConfigChecker;
import org.shedlang.compiler.config.ProjectConfig;
import org.shedlang.compiler.parser.Parser;
import org.shedlang.compiler.sources.Sources;
import org.shedlang.compiler.shid.ShidCodeGen;
import org.shedlang.compiler.shid.ShidNamespace;
import org.shedlang.compiler.typechecker.TypeChecker;
import org.shedlang.compiler.typechecker.TypeCheckerContext;
import org.shedlang.compiler.types.*;
import org.shedlang.compiler.util.P;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.shedlang.compiler.parser.Tokeniser.tokenise;
public class ShedCompiler {
public void compile(Path projectRoot, Backend backend) throws IOException, InterruptedException {
var config = ProjectConfig.read(projectRoot);
var sourceRoot = projectRoot.resolve("src");
var sourceFilePaths = collectSourceFilePaths(sourceRoot);
var untypedNamespaceNodes = parseSource(sourceRoot, sourceFilePaths);
var namespaces = new ArrayList<ShidNamespace>();
var typeCheckerContext = TypeCheckerContext.EMPTY
.addNamespaceTypeInfo(
ShedBuiltins.NAMESPACE_NAME,
new NamespaceTypeInfo(FieldsInfo.of(
FieldsInfo.freeField(ShedBuiltins.PRINT_NAME, ShedBuiltins.PRINT_TYPE)
))
)
.enterGlobal(P.map(
Map.entry("Bool", Types.metaType(Types.BOOL)),
Map.entry("Int", Types.metaType(Types.INT)),
Map.entry("Io", Types.effectType(Effects.IO)),
Map.entry("String", Types.metaType(Types.STRING)),
Map.entry("Unit", Types.metaType(Types.UNIT)),
Map.entry(ShedBuiltins.PRINT_NAME, ShedBuiltins.PRINT_TYPE)
));
for (var untypedNamespaceNode : orderSourceFiles(untypedNamespaceNodes)) {
var typeCheckNamespaceResult = TypeChecker.typeCheckNamespace(untypedNamespaceNode, typeCheckerContext);
typeCheckerContext = typeCheckNamespaceResult.context();
var shidNamespace = ShidCodeGen.compileNamespace(typeCheckNamespaceResult.value());
namespaces.add(shidNamespace);
}
var typeInfos = typeCheckerContext.toTypeInfos();
ConfigChecker.configCheck(config, typeInfos);
backend.compile(
config,
namespaces,
typeInfos,
config.targetDir().resolve(backend.name())
);
}
private List<Path> collectSourceFilePaths(Path sourceRoot) throws IOException {
var paths = new ArrayList<Path>();
Files.walkFileTree(sourceRoot, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(
Path file,
BasicFileAttributes attrs
) {
if (file.getFileName().toString().endsWith(".shed")) {
paths.add(file);
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(
Path dir,
IOException exc
) {
return FileVisitResult.CONTINUE;
}
});
paths.sort(Comparator.naturalOrder());
return paths;
}
private List<UntypedNamespaceNode> parseSource(
Path sourceRoot,
List<Path> sourceFilePaths
) throws IOException {
var untypedNamespaceNodes = new ArrayList<UntypedNamespaceNode>();
for (var sourceFilePath : sourceFilePaths) {
var namespaceNameParts = StreamSupport.stream(sourceRoot.relativize(sourceFilePath).spliterator(), false)
.map(element -> {
var string = element.toString();
return string.substring(0, string.lastIndexOf('.'));
})
.toList();
var namespaceName = new NamespaceName(namespaceNameParts);
var sourceContents = Files.readString(sourceFilePath, StandardCharsets.UTF_8);
var source = Sources.file(sourceFilePath.toString(), sourceContents);
var tokens = tokenise(source);
var untypedNode = Parser.parseNamespace(tokens, namespaceName);
untypedNamespaceNodes.add(untypedNode);
}
return untypedNamespaceNodes;
}
private List<UntypedNamespaceNode> orderSourceFiles(
List<UntypedNamespaceNode> untypedNamespaceNodes
) {
var nodesByName = untypedNamespaceNodes.stream()
.collect(Collectors.toMap(x -> x.namespaceName(), x -> x));
var seen = new HashSet<NamespaceName>();
var ordered = new ArrayList<UntypedNamespaceNode>();
// TODO: test this!
// TODO: handle infinite loops
// TODO: handle missing namespaces
var adder = new Object() {
private void add(NamespaceName name) {
if (!seen.contains(name)) {
var untypedNamespaceNode = nodesByName.get(name);
for (var import_ : untypedNamespaceNode.imports()) {
add(import_.namespaceName());
}
seen.add(name);
ordered.add(untypedNamespaceNode);
}
}
};
for (var untypedNamespaceNode : untypedNamespaceNodes) {
adder.add(untypedNamespaceNode.namespaceName());
}
return ordered;
}
}
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