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/*
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* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jshell;
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import com.sun.source.tree.ClassTree;
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import com.sun.source.tree.CompilationUnitTree;
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import com.sun.source.tree.ExpressionTree;
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import com.sun.source.tree.MethodTree;
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import com.sun.source.tree.ReturnTree;
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import com.sun.source.tree.StatementTree;
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import com.sun.source.tree.Tree;
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import com.sun.source.tree.VariableTree;
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import com.sun.source.util.SourcePositions;
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import com.sun.source.util.TreePath;
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import com.sun.source.util.Trees;
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import com.sun.tools.javac.code.Type;
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import com.sun.tools.javac.code.Type.MethodType;
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import com.sun.tools.javac.code.Types;
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import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
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import com.sun.tools.javac.util.JavacMessages;
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import com.sun.tools.javac.util.Name;
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import static jdk.jshell.Util.isDoIt;
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import jdk.jshell.Wrap.Range;
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import java.util.List;
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import java.util.Locale;
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import java.util.function.BinaryOperator;
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import javax.lang.model.type.TypeMirror;
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/**
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* Utilities for analyzing compiler API parse trees.
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* @author Robert Field
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*/
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class TreeDissector {
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private static final String OBJECT_TYPE = "Object";
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static class ExpressionInfo {
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boolean isNonVoid;
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String typeName;
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ExpressionTree tree;
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String signature;
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}
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private final TaskFactory.BaseTask bt;
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private ClassTree firstClass;
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private SourcePositions theSourcePositions = null;
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TreeDissector(TaskFactory.BaseTask bt) {
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this.bt = bt;
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}
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ClassTree firstClass() {
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if (firstClass == null) {
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firstClass = computeFirstClass();
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}
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return firstClass;
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}
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CompilationUnitTree cuTree() {
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return bt.cuTree();
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}
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Types types() {
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return bt.types();
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}
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Trees trees() {
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return bt.trees();
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}
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SourcePositions getSourcePositions() {
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if (theSourcePositions == null) {
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theSourcePositions = trees().getSourcePositions();
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}
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return theSourcePositions;
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}
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int getStartPosition(Tree tree) {
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return (int) getSourcePositions().getStartPosition(cuTree(), tree);
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}
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int getEndPosition(Tree tree) {
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return (int) getSourcePositions().getEndPosition(cuTree(), tree);
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}
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Range treeToRange(Tree tree) {
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return new Range(getStartPosition(tree), getEndPosition(tree));
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}
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Range treeListToRange(List<? extends Tree> treeList) {
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int start = Integer.MAX_VALUE;
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int end = -1;
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for (Tree t : treeList) {
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int tstart = getStartPosition(t);
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int tend = getEndPosition(t);
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if (tstart < start) {
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start = tstart;
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}
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if (tend > end) {
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end = tend;
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}
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}
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if (start == Integer.MAX_VALUE) {
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return null;
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}
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return new Range(start, end);
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}
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Tree firstClassMember() {
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if (firstClass() != null) {
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//TODO: missing classes
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for (Tree mem : firstClass().getMembers()) {
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if (mem.getKind() == Tree.Kind.VARIABLE) {
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return mem;
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}
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if (mem.getKind() == Tree.Kind.METHOD) {
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MethodTree mt = (MethodTree) mem;
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if (!isDoIt(mt.getName()) && !mt.getName().toString().equals("<init>")) {
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return mt;
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}
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}
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}
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}
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return null;
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}
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StatementTree firstStatement() {
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if (firstClass() != null) {
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for (Tree mem : firstClass().getMembers()) {
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if (mem.getKind() == Tree.Kind.METHOD) {
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MethodTree mt = (MethodTree) mem;
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if (isDoIt(mt.getName())) {
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List<? extends StatementTree> stmts = mt.getBody().getStatements();
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if (!stmts.isEmpty()) {
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return stmts.get(0);
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}
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}
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}
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}
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}
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return null;
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}
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VariableTree firstVariable() {
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if (firstClass() != null) {
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for (Tree mem : firstClass().getMembers()) {
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if (mem.getKind() == Tree.Kind.VARIABLE) {
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VariableTree vt = (VariableTree) mem;
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return vt;
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}
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}
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}
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return null;
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}
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private ClassTree computeFirstClass() {
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if (cuTree() == null) {
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return null;
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}
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for (Tree decl : cuTree().getTypeDecls()) {
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if (decl.getKind() == Tree.Kind.CLASS || decl.getKind() == Tree.Kind.INTERFACE) {
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return (ClassTree) decl;
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}
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}
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return null;
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}
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ExpressionInfo typeOfReturnStatement(JavacMessages messages, BinaryOperator<String> fullClassNameAndPackageToClass) {
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ExpressionInfo ei = new ExpressionInfo();
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Tree unitTree = firstStatement();
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if (unitTree instanceof ReturnTree) {
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ei.tree = ((ReturnTree) unitTree).getExpression();
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if (ei.tree != null) {
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TreePath viPath = trees().getPath(cuTree(), ei.tree);
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if (viPath != null) {
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TypeMirror tm = trees().getTypeMirror(viPath);
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if (tm != null) {
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Type type = (Type)tm;
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TypePrinter tp = new TypePrinter(messages, fullClassNameAndPackageToClass, type);
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ei.typeName = tp.visit(type, Locale.getDefault());
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switch (tm.getKind()) {
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case VOID:
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case NONE:
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case ERROR:
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case OTHER:
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break;
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case NULL:
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ei.isNonVoid = true;
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ei.typeName = OBJECT_TYPE;
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break;
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default: {
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ei.isNonVoid = true;
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break;
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}
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}
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}
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}
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}
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}
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return ei;
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}
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String typeOfMethod() {
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Tree unitTree = firstClassMember();
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if (unitTree instanceof JCMethodDecl) {
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JCMethodDecl mtree = (JCMethodDecl) unitTree;
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Type mt = types().erasure(mtree.type);
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if (mt instanceof MethodType) {
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return signature(types(), (MethodType) mt);
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}
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}
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return null;
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}
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static String signature(Types types, MethodType mt) {
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TDSignatureGenerator sg = new TDSignatureGenerator(types);
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sg.assembleSig(mt);
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return sg.toString();
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}
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/**
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* Signature Generation
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*/
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private static class TDSignatureGenerator extends Types.SignatureGenerator {
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/**
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* An output buffer for type signatures.
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*/
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StringBuilder sb = new StringBuilder();
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TDSignatureGenerator(Types types) {
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super(types);
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}
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@Override
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protected void append(char ch) {
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sb.append(ch);
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}
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@Override
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protected void append(byte[] ba) {
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sb.append(new String(ba));
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}
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@Override
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protected void append(Name name) {
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sb.append(name);
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}
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@Override
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public String toString() {
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return sb.toString();
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}
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}
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}
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