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package org.javacs;
import com.sun.source.tree.*;
import com.sun.source.util.*;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import javax.lang.model.element.*;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
import org.eclipse.lsp4j.Range;
public class CompileBatch {
private final JavaCompilerService parent;
private final JavacTask task;
private final Trees trees;
private final List<CompilationUnitTree> roots;
CompileBatch(JavaCompilerService parent, Collection<URI> files) {
this.parent = parent;
this.task = batchTask(parent, files);
this.trees = Trees.instance(task);
this.roots = new ArrayList<CompilationUnitTree>();
var profiler = new Profiler();
task.addTaskListener(profiler);
try {
for (var t : task.parse()) roots.add(t);
task.analyze();
// The results of task.analyze() are unreliable when errors are present
// You can get at `Element` values using `Trees`
task.analyze();
} catch (IOException e) {
throw new RuntimeException(e);
}
profiler.print();
}
static JavacTask batchTask(JavaCompilerService parent, Collection<URI> paths) {
parent.diags.clear();
var files = new ArrayList<File>();
for (var p : paths) files.add(new File(p));
return (JavacTask)
parent.compiler.getTask(
null,
parent.fileManager,
parent.diags::add,
JavaCompilerService.options(parent.sourcePath, parent.classPath),
Collections.emptyList(),
parent.fileManager.getJavaFileObjectsFromFiles(files));
}
public List<Diagnostic<? extends JavaFileObject>> lint() {
return Collections.unmodifiableList(new ArrayList<>(parent.diags));
}
public List<TreePath> references(Element to) {
LOG.info(String.format("Search for references to `%s` in %d files...", to, roots.size()));
var result = new ArrayList<TreePath>();
for (var f : roots) {
result.addAll(referencesToElement(f, to));
}
return result;
}
public Map<URI, Index> countReferences() {
var index = new HashMap<URI, Index>();
for (var f : roots) {
var uri = f.getSourceFile().toUri();
var path = Paths.get(uri);
var refs = index(f);
FileTime modified;
try {
modified = Files.getLastModifiedTime(path);
} catch (IOException e) {
throw new RuntimeException(e);
}
var i = new Index(refs, modified.toInstant());
index.put(uri, i);
}
return index;
}
public Optional<Range> range(TreePath path) {
var uri = path.getCompilationUnit().getSourceFile().toUri();
var file = Paths.get(uri);
String contents;
try {
contents = Files.readAllLines(file).stream().collect(Collectors.joining("\n"));
} catch (IOException e) {
throw new RuntimeException(e);
}
return ParseFile.range(task, contents, path);
}
private boolean toStringEquals(Object left, Object right) {
return Objects.equals(Objects.toString(left, ""), Objects.toString(right, ""));
}
private boolean sameSymbol(Element from, Element to) {
return to != null
&& from != null
&& toStringEquals(to.getEnclosingElement(), from.getEnclosingElement())
&& toStringEquals(to, from);
}
private boolean isField(Element to) {
if (!(to instanceof VariableElement)) return false;
var field = (VariableElement) to;
return field.getEnclosingElement() instanceof TypeElement;
}
private Optional<TreePath> ref(TreePath from) {
var root = from.getCompilationUnit();
var lines = root.getLineMap();
var to = trees.getElement(from);
// Skip elements we can't find
if (to == null) {
// LOG.warning(String.format("No element for `%s`", from.getLeaf()));
return Optional.empty();
}
// Skip non-methods
if (!(to instanceof ExecutableElement || to instanceof TypeElement || isField(to))) {
return Optional.empty();
}
// TODO skip anything not on source path
var result = trees.getPath(to);
if (result == null) {
// LOG.warning(String.format("Element `%s` has no TreePath", to));
return Optional.empty();
}
return Optional.of(result);
}
private List<TreePath> referencesToElement(CompilationUnitTree root, Element to) {
var trees = Trees.instance(task);
var results = new ArrayList<TreePath>();
class FindReferencesElement extends TreePathScanner<Void, Void> {
void check(TreePath from) {
var found = trees.getElement(from);
if (sameSymbol(found, to)) {
results.add(from);
}
}
@Override
public Void visitMemberReference(MemberReferenceTree t, Void __) {
check(getCurrentPath());
return super.visitMemberReference(t, null);
}
@Override
public Void visitMemberSelect(MemberSelectTree t, Void __) {
check(getCurrentPath());
return super.visitMemberSelect(t, null);
}
@Override
public Void visitIdentifier(IdentifierTree t, Void __) {
check(getCurrentPath());
return super.visitIdentifier(t, null);
}
@Override
public Void visitNewClass(NewClassTree t, Void __) {
check(getCurrentPath());
return super.visitNewClass(t, null);
}
}
new FindReferencesElement().scan(root, null);
LOG.info(
String.format(
"...found %d references in %s", results.size(), Parser.fileName(root.getSourceFile().toUri())));
return results;
}
private List<Ptr> index(CompilationUnitTree root) {
var refs = new ArrayList<Ptr>();
class IndexFile extends TreePathScanner<Void, Void> {
void check(TreePath from) {
ref(from).map(Ptr::new).ifPresent(refs::add);
}
@Override
public Void visitMemberReference(MemberReferenceTree t, Void __) {
check(getCurrentPath());
return super.visitMemberReference(t, null);
}
@Override
public Void visitMemberSelect(MemberSelectTree t, Void __) {
check(getCurrentPath());
return super.visitMemberSelect(t, null);
}
@Override
public Void visitIdentifier(IdentifierTree t, Void __) {
check(getCurrentPath());
return super.visitIdentifier(t, null);
}
@Override
public Void visitNewClass(NewClassTree t, Void __) {
check(getCurrentPath());
return super.visitNewClass(t, null);
}
}
new IndexFile().scan(root, null);
if (refs.size() > 0)
LOG.info(
String.format(
"Found %d refs in %s", refs.size(), Paths.get(root.getSourceFile().toUri()).getFileName()));
return refs;
}
private static final Logger LOG = Logger.getLogger("main");
}
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