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package jdk.jshell;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.StatementTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.SourcePositions;
import com.sun.source.util.Trees;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Type.MethodType;
import com.sun.tools.javac.code.Types;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.util.Name;
import static jdk.jshell.Util.isDoIt;
import jdk.jshell.TaskFactory.AnalyzeTask;
import jdk.jshell.Wrap.Range;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Stream;
import javax.lang.model.type.TypeMirror;
import jdk.jshell.TypePrinter.AnonymousTypeKind;
import jdk.jshell.Util.Pair;
/**
* Utilities for analyzing compiler API parse trees.
* @author Robert Field
*/
class TreeDissector {
private final TaskFactory.BaseTask bt;
private final ClassTree targetClass;
private final CompilationUnitTree targetCompilationUnit;
private SourcePositions theSourcePositions = null;
private TreeDissector(TaskFactory.BaseTask bt, CompilationUnitTree targetCompilationUnit, ClassTree targetClass) {
this.bt = bt;
this.targetCompilationUnit = targetCompilationUnit;
this.targetClass = targetClass;
}
static TreeDissector createByFirstClass(TaskFactory.BaseTask bt) {
Pair<CompilationUnitTree, ClassTree> pair = classes(bt.firstCuTree())
.findFirst().orElseGet(() -> new Pair<>(bt.firstCuTree(), null));
return new TreeDissector(bt, pair.first, pair.second);
}
private static final Predicate<? super Tree> isClassOrInterface =
t -> t.getKind() == Tree.Kind.CLASS || t.getKind() == Tree.Kind.INTERFACE;
private static Stream<Pair<CompilationUnitTree, ClassTree>> classes(CompilationUnitTree cut) {
return cut == null
? Stream.empty()
: cut.getTypeDecls().stream()
.filter(isClassOrInterface)
.map(decl -> new Pair<>(cut, (ClassTree)decl));
}
private static Stream<Pair<CompilationUnitTree, ClassTree>> classes(Iterable<? extends CompilationUnitTree> cuts) {
return Util.stream(cuts)
.flatMap(TreeDissector::classes);
}
static TreeDissector createBySnippet(TaskFactory.BaseTask bt, Snippet si) {
String name = si.className();
Pair<CompilationUnitTree, ClassTree> pair = classes(bt.cuTrees())
.filter(p -> p.second.getSimpleName().contentEquals(name))
.findFirst().orElseThrow(() ->
new IllegalArgumentException("Class " + name + " is not found."));
return new TreeDissector(bt, pair.first, pair.second);
}
Types types() {
return bt.types();
}
Trees trees() {
return bt.trees();
}
SourcePositions getSourcePositions() {
if (theSourcePositions == null) {
theSourcePositions = trees().getSourcePositions();
}
return theSourcePositions;
}
int getStartPosition(Tree tree) {
return (int) getSourcePositions().getStartPosition(targetCompilationUnit, tree);
}
int getEndPosition(Tree tree) {
return (int) getSourcePositions().getEndPosition(targetCompilationUnit, tree);
}
Range treeToRange(Tree tree) {
return new Range(getStartPosition(tree), getEndPosition(tree));
}
Range treeListToRange(List<? extends Tree> treeList) {
int start = Integer.MAX_VALUE;
int end = -1;
for (Tree t : treeList) {
int tstart = getStartPosition(t);
int tend = getEndPosition(t);
if (tstart < start) {
start = tstart;
}
if (tend > end) {
end = tend;
}
}
if (start == Integer.MAX_VALUE) {
return null;
}
return new Range(start, end);
}
MethodTree method(MethodSnippet msn) {
if (targetClass == null) {
return null;
}
OuterWrap ow = msn.outerWrap();
if (!(ow instanceof OuterSnippetsClassWrap)) {
return null;
}
int ordinal = ((OuterSnippetsClassWrap) ow).ordinal(msn);
if (ordinal < 0) {
return null;
}
int count = 0;
String name = msn.name();
for (Tree mem : targetClass.getMembers()) {
if (mem.getKind() == Tree.Kind.METHOD) {
MethodTree mt = (MethodTree) mem;
if (mt.getName().toString().equals(name)) {
if (count == ordinal) {
return mt;
}
++count;
}
}
}
return null;
}
StatementTree firstStatement() {
if (targetClass != null) {
for (Tree mem : targetClass.getMembers()) {
if (mem.getKind() == Tree.Kind.METHOD) {
MethodTree mt = (MethodTree) mem;
if (isDoIt(mt.getName())) {
List<? extends StatementTree> stmts = mt.getBody().getStatements();
if (!stmts.isEmpty()) {
return stmts.get(0);
}
}
}
}
}
return null;
}
VariableTree firstVariable() {
if (targetClass != null) {
for (Tree mem : targetClass.getMembers()) {
if (mem.getKind() == Tree.Kind.VARIABLE) {
VariableTree vt = (VariableTree) mem;
return vt;
}
}
}
return null;
}
String typeOfMethod(MethodSnippet msn) {
Tree unitTree = method(msn);
if (unitTree instanceof JCMethodDecl) {
JCMethodDecl mtree = (JCMethodDecl) unitTree;
Type mt = types().erasure(mtree.type);
if (mt instanceof MethodType) {
return signature(types(), (MethodType) mt);
}
}
return null;
}
static String signature(Types types, MethodType mt) {
TDSignatureGenerator sg = new TDSignatureGenerator(types);
sg.assembleSig(mt);
return sg.toString();
}
public static String printType(AnalyzeTask at, JShell state, TypeMirror type) {
Type typeImpl = (Type) type;
try {
TypePrinter tp = new TypePrinter(at.messages(),
/**代码未完, 请加载全部代码(NowJava.com).**/