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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.backends.paths.TargetDir;
import org.shedlang.compiler.config.ConfigChecker;
import org.shedlang.compiler.config.ProfileConfig;
import org.shedlang.compiler.config.ProjectConfig;
import org.shedlang.compiler.parser.Parser;
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 org.zwobble.sourcetext.SourceText;
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.StreamSupport;
import static org.shedlang.compiler.parser.Tokeniser.tokenise;
import static org.shedlang.compiler.typechecker.NamespaceDependencyLineariser.orderNamespaces;
public class ShedCompiler {
public void compile(
Path projectRoot,
Backend backend,
Optional<String> profileName
) throws IOException, InterruptedException {
var config = ProjectConfig.read(projectRoot);
var projectRoots = findProjectRoots(config);
var untypedNamespaceNodes = projectRoots.stream()
.flatMap(root -> {
var sourceRoot = root.resolve("src");
try {
var sourceFilePaths = collectSourceFilePaths(sourceRoot);
return parseSource(sourceRoot, sourceFilePaths).stream();
} catch (IOException exception) {
throw new RuntimeException(exception);
}
})
.toList();
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 : orderNamespaces(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);
var profileConfig = profileName.map(config::profile)
.orElse(ProfileConfig.DEFAULT);
backend.compile(
config,
profileConfig,
namespaces,
typeInfos,
new TargetDir(
config.targetDir()
.resolve(backend.targetName())
.resolve(profileConfig.name())
)
);
}
/**
* Find the roots of any projects that require compilation, including
* transitive dependencies.
*/
private LinkedHashSet<Path> findProjectRoots(ProjectConfig config) throws IOException {
var projectRoots = new LinkedHashSet<Path>();
var pendingProjects = new ArrayDeque<Path>();
pendingProjects.add(config.root());
// TODO: detect cycles
while (!pendingProjects.isEmpty()) {
var projectRoot = pendingProjects.removeFirst();
if (projectRoots.add(projectRoot)) {
var projectConfig = ProjectConfig.read(projectRoot);
for (var dependency : projectConfig.dependencies()) {
pendingProjects.add(dependency.path());
}
}
}
return projectRoots;
}
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) {
// TODO: handle path -> namespace name properly and test
var namespaceNameParts = StreamSupport.stream(sourceRoot.relativize(sourceFilePath).spliterator(), false)
.map(element -> {
var string = element.toString();
var lastDotIndex = string.lastIndexOf('.');
if (lastDotIndex == -1) {
return string;
} else {
return string.substring(0, lastDotIndex);
}
})
.toList();
var namespaceName = new NamespaceName(namespaceNameParts);
var sourceContents = Files.readString(sourceFilePath, StandardCharsets.UTF_8);
var sourceText = SourceText.fromString(sourceFilePath.toString(), sourceContents);
var tokens = tokenise(sourceText);
var untypedNode = Parser.parseNamespace(tokens, namespaceName);
untypedNamespaceNodes.add(untypedNode);
}
return untypedNamespaceNodes;
}
}
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