--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.jshell/share/classes/jdk/jshell/ReplParser.java Mon Oct 19 19:15:16 2015 +0200
@@ -0,0 +1,272 @@
+/*
+ * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.jshell;
+
+import com.sun.tools.javac.code.TypeTag;
+import com.sun.tools.javac.parser.JavacParser;
+import com.sun.tools.javac.parser.ParserFactory;
+import com.sun.tools.javac.parser.Tokens.Comment;
+import com.sun.tools.javac.parser.Tokens.Comment.CommentStyle;
+import com.sun.tools.javac.parser.Tokens.Token;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.CLASS;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.COLON;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.ENUM;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.EOF;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.INTERFACE;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.LPAREN;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.MONKEYS_AT;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.PACKAGE;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.SEMI;
+import static com.sun.tools.javac.parser.Tokens.TokenKind.VOID;
+import com.sun.tools.javac.tree.JCTree;
+import com.sun.tools.javac.tree.JCTree.JCAnnotation;
+import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
+import com.sun.tools.javac.tree.JCTree.JCExpression;
+import com.sun.tools.javac.tree.JCTree.JCExpressionStatement;
+import com.sun.tools.javac.tree.JCTree.JCModifiers;
+import com.sun.tools.javac.tree.JCTree.JCPackageDecl;
+import com.sun.tools.javac.tree.JCTree.JCStatement;
+import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
+import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
+import com.sun.tools.javac.tree.JCTree.Tag;
+import static com.sun.tools.javac.tree.JCTree.Tag.IDENT;
+import com.sun.tools.javac.util.List;
+import com.sun.tools.javac.util.ListBuffer;
+import com.sun.tools.javac.util.Name;
+import com.sun.tools.javac.util.Position;
+
+/**
+ * This is a subclass of JavacParser which overrides one method with a modified
+ * verson of that method designed to allow parsing of one "snippet" of Java
+ * code without the surrounding context of class, method, etc.
+ * Accepts an expression, a statement, an import, or the declaration of a
+ * method, variable, or type (class, interface, ...).
+ */
+class ReplParser extends JavacParser {
+
+ public ReplParser(ParserFactory fac,
+ com.sun.tools.javac.parser.Lexer S,
+ boolean keepDocComments,
+ boolean keepLineMap,
+ boolean keepEndPositions) {
+ super(fac, S, keepDocComments, keepLineMap, keepEndPositions);
+ }
+
+ /**
+ * As faithful a clone of the overridden method as possible while still
+ * achieving the goal of allowing the parse of a stand-alone snippet.
+ * As a result, some variables are assigned and never used, tests are
+ * always true, loops don't, etc. This is to allow easy transition as the
+ * underlying method changes.
+ * @return a snippet wrapped in a compilation unit
+ */
+ @Override
+ public JCCompilationUnit parseCompilationUnit() {
+ Token firstToken = token;
+ JCModifiers mods = null;
+ boolean seenImport = false;
+ boolean seenPackage = false;
+ ListBuffer<JCTree> defs = new ListBuffer<>();
+ if (token.kind == MONKEYS_AT) {
+ mods = modifiersOpt();
+ }
+
+ if (token.kind == PACKAGE) {
+ int packagePos = token.pos;
+ List<JCAnnotation> annotations = List.nil();
+ seenPackage = true;
+ if (mods != null) {
+ checkNoMods(mods.flags);
+ annotations = mods.annotations;
+ mods = null;
+ }
+ nextToken();
+ JCExpression pid = qualident(false);
+ accept(SEMI);
+ JCPackageDecl pd = F.at(packagePos).PackageDecl(annotations, pid);
+ attach(pd, firstToken.comment(CommentStyle.JAVADOC));
+ storeEnd(pd, token.pos);
+ defs.append(pd);
+ }
+
+ boolean firstTypeDecl = true;
+ while (token.kind != EOF) {
+ if (token.pos > 0 && token.pos <= endPosTable.errorEndPos) {
+ // error recovery
+ skip(true, false, false, false);
+ if (token.kind == EOF) {
+ break;
+ }
+ }
+ if (mods == null && token.kind == IMPORT) {
+ seenImport = true;
+ defs.append(importDeclaration());
+ } else {
+ Comment docComment = token.comment(CommentStyle.JAVADOC);
+ if (firstTypeDecl && !seenImport && !seenPackage) {
+ docComment = firstToken.comment(CommentStyle.JAVADOC);
+ }
+ List<? extends JCTree> udefs = replUnit(mods, docComment);
+ // if (def instanceof JCExpressionStatement)
+ // def = ((JCExpressionStatement)def).expr;
+ for (JCTree def : udefs) {
+ defs.append(def);
+ }
+ mods = null;
+ firstTypeDecl = false;
+ }
+ break; // Remove to process more than one snippet
+ }
+ List<JCTree> rdefs = defs.toList();
+ class ReplUnit extends JCCompilationUnit {
+
+ public ReplUnit(List<JCTree> defs) {
+ super(defs);
+ }
+ }
+ JCCompilationUnit toplevel = new ReplUnit(rdefs);
+ if (rdefs.isEmpty()) {
+ storeEnd(toplevel, S.prevToken().endPos);
+ }
+ toplevel.lineMap = S.getLineMap();
+ this.endPosTable.setParser(null); // remove reference to parser
+ toplevel.endPositions = this.endPosTable;
+ return toplevel;
+ }
+
+ @SuppressWarnings("fallthrough")
+ List<? extends JCTree> replUnit(JCModifiers pmods, Comment dc) {
+ switch (token.kind) {
+ case EOF:
+ return List.nil();
+ case RBRACE:
+ case CASE:
+ case DEFAULT:
+ // These are illegal, fall through to handle as illegal statement
+ case LBRACE:
+ case IF:
+ case FOR:
+ case WHILE:
+ case DO:
+ case TRY:
+ case SWITCH:
+ case RETURN:
+ case THROW:
+ case BREAK:
+ case CONTINUE:
+ case SEMI:
+ case ELSE:
+ case FINALLY:
+ case CATCH:
+ case ASSERT:
+ return List.<JCTree>of(parseStatement());
+ case SYNCHRONIZED:
+ if (peekToken(LPAREN)) {
+ return List.<JCTree>of(parseStatement());
+ }
+ //fall-through
+ default:
+ JCModifiers mods = modifiersOpt(pmods);
+ if (token.kind == CLASS
+ || token.kind == INTERFACE
+ || token.kind == ENUM) {
+ return List.<JCTree>of(classOrInterfaceOrEnumDeclaration(mods, dc));
+ } else {
+ int pos = token.pos;
+ List<JCTypeParameter> typarams = typeParametersOpt();
+ // if there are type parameters but no modifiers, save the start
+ // position of the method in the modifiers.
+ if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
+ mods.pos = pos;
+ storeEnd(mods, pos);
+ }
+ List<JCAnnotation> annosAfterParams = annotationsOpt(Tag.ANNOTATION);
+
+ if (annosAfterParams.nonEmpty()) {
+ checkAnnotationsAfterTypeParams(annosAfterParams.head.pos);
+ mods.annotations = mods.annotations.appendList(annosAfterParams);
+ if (mods.pos == Position.NOPOS) {
+ mods.pos = mods.annotations.head.pos;
+ }
+ }
+
+ Token prevToken = token;
+ pos = token.pos;
+ JCExpression t;
+ boolean isVoid = token.kind == VOID;
+ if (isVoid) {
+ t = to(F.at(pos).TypeIdent(TypeTag.VOID));
+ nextToken();
+ } else {
+ // return type of method, declared type of variable, or an expression
+ t = term(EXPR | TYPE);
+ }
+ if (token.kind == COLON && t.hasTag(IDENT)) {
+ // labelled statement
+ nextToken();
+ JCStatement stat = parseStatement();
+ return List.<JCTree>of(F.at(pos).Labelled(prevToken.name(), stat));
+ } else if ((isVoid || (lastmode & TYPE) != 0) && LAX_IDENTIFIER.accepts(token.kind)) {
+ // we have "Type Ident", so we can assume it is variable or method declaration
+ pos = token.pos;
+ Name name = ident();
+ if (token.kind == LPAREN) {
+ // method declaration
+ //mods.flags |= Flags.STATIC;
+ return List.of(methodDeclaratorRest(
+ pos, mods, t, name, typarams,
+ false, isVoid, dc));
+ } else if (!isVoid && typarams.isEmpty()) {
+ // variable declaration
+ //mods.flags |= Flags.STATIC;
+ List<JCTree> defs
+ = variableDeclaratorsRest(pos, mods, t, name, false, dc,
+ new ListBuffer<JCTree>()).toList();
+ accept(SEMI);
+ storeEnd(defs.last(), S.prevToken().endPos);
+ return defs;
+ } else {
+ // malformed declaration, return error
+ pos = token.pos;
+ List<JCTree> err = isVoid
+ ? List.<JCTree>of(toP(F.at(pos).MethodDef(mods, name, t, typarams,
+ List.<JCVariableDecl>nil(), List.<JCExpression>nil(), null, null)))
+ : null;
+ return List.<JCTree>of(syntaxError(token.pos, err, "expected", LPAREN));
+ }
+ } else if (!typarams.isEmpty()) {
+ // type parameters on non-variable non-method -- error
+ return List.<JCTree>of(syntaxError(token.pos, "illegal.start.of.type"));
+ } else {
+ // expression-statement or expression to evaluate
+ JCExpressionStatement expr = toP(F.at(pos).Exec(t));
+ return List.<JCTree>of(expr);
+ }
+
+ }
+ }
+ }
+}