author | jjg |
Wed, 03 Aug 2016 16:01:09 -0700 | |
changeset 40232 | 4995ab1a4558 |
parent 36494 | 4175f47b2a50 |
child 40771 | bf0e92ede33f |
permissions | -rw-r--r-- |
33362 | 1 |
/* |
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* Copyright (c) 2015, 2016, 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.tools.javac.code.Source; |
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import com.sun.tools.javac.parser.Scanner; |
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import com.sun.tools.javac.parser.ScannerFactory; |
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import com.sun.tools.javac.parser.Tokens.Token; |
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import com.sun.tools.javac.parser.Tokens.TokenKind; |
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import com.sun.tools.javac.util.Context; |
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import com.sun.tools.javac.util.JCDiagnostic; |
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import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; |
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import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
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import com.sun.tools.javac.util.Log; |
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import java.io.PrintWriter; |
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import java.io.StringWriter; |
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import java.util.ArrayDeque; |
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import java.util.Deque; |
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import java.util.EnumMap; |
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import java.util.Iterator; |
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import jdk.jshell.SourceCodeAnalysis.Completeness; |
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import com.sun.source.tree.Tree; |
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import static jdk.jshell.CompletenessAnalyzer.TK.*; |
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import jdk.jshell.TaskFactory.ParseTask; |
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import java.util.List; |
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||
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/** |
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* Low level scanner to determine completeness of input. |
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* @author Robert Field |
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*/ |
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class CompletenessAnalyzer { |
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private final ScannerFactory scannerFactory; |
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private final JShell proc; |
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private static Completeness error() { |
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return Completeness.UNKNOWN; // For breakpointing |
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} |
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static class CaInfo { |
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CaInfo(Completeness status, int unitEndPos) { |
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this.status = status; |
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this.unitEndPos = unitEndPos; |
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} |
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final int unitEndPos; |
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final Completeness status; |
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} |
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CompletenessAnalyzer(JShell proc) { |
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this.proc = proc; |
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Context context = new Context(); |
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Log log = CaLog.createLog(context); |
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context.put(Log.class, log); |
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context.put(Source.class, Source.JDK1_9); |
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scannerFactory = ScannerFactory.instance(context); |
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} |
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CaInfo scan(String s) { |
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try { |
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Scanner scanner = scannerFactory.newScanner(s, false); |
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Matched in = new Matched(scanner); |
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Parser parser = new Parser(in, proc, s); |
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Completeness stat = parser.parseUnit(); |
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int endPos = stat == Completeness.UNKNOWN |
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? s.length() |
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: in.prevCT.endPos; |
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return new CaInfo(stat, endPos); |
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} catch (SyntaxException ex) { |
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return new CaInfo(error(), s.length()); |
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} |
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} |
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@SuppressWarnings("serial") // serialVersionUID intentionally omitted |
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private static class SyntaxException extends RuntimeException { |
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} |
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private static void die() { |
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throw new SyntaxException(); |
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} |
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/** |
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* Subclass of Log used by compiler API to die on error and ignore |
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* other messages |
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*/ |
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private static class CaLog extends Log { |
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private static CaLog createLog(Context context) { |
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PrintWriter pw = new PrintWriter(new StringWriter()); |
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4995ab1a4558
8162359: javac should use stdout for --help and --version
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parents:
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CaLog log = new CaLog(context, pw); |
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context.put(logKey, log); |
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return log; |
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} |
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4995ab1a4558
8162359: javac should use stdout for --help and --version
jjg
parents:
36494
diff
changeset
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private CaLog(Context context, PrintWriter pw) { |
4995ab1a4558
8162359: javac should use stdout for --help and --version
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parents:
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super(context, pw); |
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} |
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@Override |
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public void error(String key, Object... args) { |
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die(); |
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} |
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@Override |
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public void error(DiagnosticPosition pos, String key, Object... args) { |
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die(); |
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} |
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@Override |
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public void error(DiagnosticFlag flag, DiagnosticPosition pos, String key, Object... args) { |
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die(); |
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} |
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@Override |
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public void error(int pos, String key, Object... args) { |
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die(); |
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} |
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@Override |
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public void error(DiagnosticFlag flag, int pos, String key, Object... args) { |
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die(); |
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} |
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@Override |
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public void report(JCDiagnostic diagnostic) { |
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// Ignore |
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} |
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} |
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// Location position kinds -- a token is ... |
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private static final int XEXPR = 0b1; // OK in expression (not first) |
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private static final int XDECL = 0b10; // OK in declaration (not first) |
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private static final int XSTMT = 0b100; // OK in statement framework (not first) |
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private static final int XEXPR1o = 0b1000; // OK first in expression |
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private static final int XDECL1o = 0b10000; // OK first in declaration |
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private static final int XSTMT1o = 0b100000; // OK first or only in statement framework |
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private static final int XEXPR1 = XEXPR1o | XEXPR; // OK in expression (anywhere) |
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private static final int XDECL1 = XDECL1o | XDECL; // OK in declaration (anywhere) |
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private static final int XSTMT1 = XSTMT1o | XSTMT; // OK in statement framework (anywhere) |
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private static final int XANY1 = XEXPR1o | XDECL1o | XSTMT1o; // Mask: first in statement, declaration, or expression |
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private static final int XTERM = 0b100000000; // Can terminate (last before EOF) |
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private static final int XSTART = 0b1000000000; // Boundary, must be XTERM before |
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private static final int XERRO = 0b10000000000; // Is an error |
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/** |
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* An extension of the compiler's TokenKind which adds our combined/processed |
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* kinds. Also associates each TK with a union of acceptable kinds of code |
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* position it can occupy. For example: IDENTIFER is XEXPR1|XDECL1|XTERM, |
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* meaning it can occur in expressions or declarations (but not in the |
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* framework of a statement and that can be the final (terminating) token |
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* in a snippet. |
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* <P> |
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* There must be a TK defined for each compiler TokenKind, an exception |
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* will |
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* be thrown if a TokenKind is defined and a corresponding TK is not. Add a |
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* new TK in the appropriate category. If it is like an existing category |
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* (e.g. a new modifier or type this may be all that is needed. If it |
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* is bracketing or modifies the acceptable positions of other tokens, |
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* please closely examine the needed changes to this scanner. |
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*/ |
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static enum TK { |
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// Special |
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EOF(TokenKind.EOF, 0), // |
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ERROR(TokenKind.ERROR, XERRO), // |
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IDENTIFIER(TokenKind.IDENTIFIER, XEXPR1|XDECL1|XTERM), // |
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UNDERSCORE(TokenKind.UNDERSCORE, XERRO), // _ |
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CLASS(TokenKind.CLASS, XEXPR|XDECL1|XTERM), // class decl and .class |
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MONKEYS_AT(TokenKind.MONKEYS_AT, XEXPR|XDECL1), // @ |
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IMPORT(TokenKind.IMPORT, XDECL1|XSTART), // import -- consider declaration |
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SEMI(TokenKind.SEMI, XSTMT1|XTERM|XSTART), // ; |
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// Shouldn't see -- error |
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PACKAGE(TokenKind.PACKAGE, XERRO), // package |
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CONST(TokenKind.CONST, XERRO), // reserved keyword -- const |
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GOTO(TokenKind.GOTO, XERRO), // reserved keyword -- goto |
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CUSTOM(TokenKind.CUSTOM, XERRO), // No uses |
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// Declarations |
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ENUM(TokenKind.ENUM, XDECL1), // enum |
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IMPLEMENTS(TokenKind.IMPLEMENTS, XDECL), // implements |
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INTERFACE(TokenKind.INTERFACE, XDECL1), // interface |
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THROWS(TokenKind.THROWS, XDECL), // throws |
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// Primarive type names |
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BOOLEAN(TokenKind.BOOLEAN, XEXPR|XDECL1), // boolean |
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BYTE(TokenKind.BYTE, XEXPR|XDECL1), // byte |
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CHAR(TokenKind.CHAR, XEXPR|XDECL1), // char |
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DOUBLE(TokenKind.DOUBLE, XEXPR|XDECL1), // double |
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FLOAT(TokenKind.FLOAT, XEXPR|XDECL1), // float |
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INT(TokenKind.INT, XEXPR|XDECL1), // int |
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LONG(TokenKind.LONG, XEXPR|XDECL1), // long |
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SHORT(TokenKind.SHORT, XEXPR|XDECL1), // short |
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VOID(TokenKind.VOID, XEXPR|XDECL1), // void |
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// Modifiers keywords |
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ABSTRACT(TokenKind.ABSTRACT, XDECL1), // abstract |
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FINAL(TokenKind.FINAL, XDECL1), // final |
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NATIVE(TokenKind.NATIVE, XDECL1), // native |
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STATIC(TokenKind.STATIC, XDECL1), // static |
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STRICTFP(TokenKind.STRICTFP, XDECL1), // strictfp |
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PRIVATE(TokenKind.PRIVATE, XDECL1), // private |
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PROTECTED(TokenKind.PROTECTED, XDECL1), // protected |
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PUBLIC(TokenKind.PUBLIC, XDECL1), // public |
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TRANSIENT(TokenKind.TRANSIENT, XDECL1), // transient |
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VOLATILE(TokenKind.VOLATILE, XDECL1), // volatile |
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// Declarations and type parameters (thus expressions) |
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EXTENDS(TokenKind.EXTENDS, XEXPR|XDECL), // extends |
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COMMA(TokenKind.COMMA, XEXPR|XDECL), // , |
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AMP(TokenKind.AMP, XEXPR|XDECL), // & |
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GT(TokenKind.GT, XEXPR|XDECL), // > |
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LT(TokenKind.LT, XEXPR|XDECL1), // < |
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LTLT(TokenKind.LTLT, XEXPR|XDECL1), // << |
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GTGT(TokenKind.GTGT, XEXPR|XDECL), // >> |
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GTGTGT(TokenKind.GTGTGT, XEXPR|XDECL), // >>> |
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QUES(TokenKind.QUES, XEXPR|XDECL), // ? |
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DOT(TokenKind.DOT, XEXPR|XDECL), // . |
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STAR(TokenKind.STAR, XEXPR|XDECL|XTERM), // * -- import foo.* //TODO handle these case separately, XTERM |
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// Statement keywords |
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ASSERT(TokenKind.ASSERT, XSTMT1|XSTART), // assert |
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BREAK(TokenKind.BREAK, XSTMT1|XTERM|XSTART), // break |
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CATCH(TokenKind.CATCH, XSTMT1|XSTART), // catch |
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CONTINUE(TokenKind.CONTINUE, XSTMT1|XTERM|XSTART), // continue |
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DO(TokenKind.DO, XSTMT1|XSTART), // do |
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ELSE(TokenKind.ELSE, XSTMT1|XTERM|XSTART), // else |
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FINALLY(TokenKind.FINALLY, XSTMT1|XSTART), // finally |
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FOR(TokenKind.FOR, XSTMT1|XSTART), // for |
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IF(TokenKind.IF, XSTMT1|XSTART), // if |
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RETURN(TokenKind.RETURN, XSTMT1|XTERM|XSTART), // return |
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SWITCH(TokenKind.SWITCH, XSTMT1|XSTART), // switch |
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SYNCHRONIZED(TokenKind.SYNCHRONIZED, XSTMT1|XDECL), // synchronized |
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THROW(TokenKind.THROW, XSTMT1|XSTART), // throw |
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TRY(TokenKind.TRY, XSTMT1|XSTART), // try |
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WHILE(TokenKind.WHILE, XSTMT1|XSTART), // while |
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261 |
// Statement keywords that we shouldn't see -- inside braces |
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CASE(TokenKind.CASE, XSTMT|XSTART), // case |
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DEFAULT(TokenKind.DEFAULT, XSTMT|XSTART), // default method, default case -- neither we should see |
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||
265 |
// Expressions (can terminate) |
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INTLITERAL(TokenKind.INTLITERAL, XEXPR1|XTERM), // |
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LONGLITERAL(TokenKind.LONGLITERAL, XEXPR1|XTERM), // |
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268 |
FLOATLITERAL(TokenKind.FLOATLITERAL, XEXPR1|XTERM), // |
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DOUBLELITERAL(TokenKind.DOUBLELITERAL, XEXPR1|XTERM), // |
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CHARLITERAL(TokenKind.CHARLITERAL, XEXPR1|XTERM), // |
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271 |
STRINGLITERAL(TokenKind.STRINGLITERAL, XEXPR1|XTERM), // |
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272 |
TRUE(TokenKind.TRUE, XEXPR1|XTERM), // true |
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FALSE(TokenKind.FALSE, XEXPR1|XTERM), // false |
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NULL(TokenKind.NULL, XEXPR1|XTERM), // null |
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THIS(TokenKind.THIS, XEXPR1|XTERM), // this -- shouldn't see |
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||
277 |
// Expressions maybe terminate //TODO handle these case separately |
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278 |
PLUSPLUS(TokenKind.PLUSPLUS, XEXPR1|XTERM), // ++ |
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279 |
SUBSUB(TokenKind.SUBSUB, XEXPR1|XTERM), // -- |
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280 |
||
281 |
// Expressions cannot terminate |
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282 |
INSTANCEOF(TokenKind.INSTANCEOF, XEXPR), // instanceof |
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283 |
NEW(TokenKind.NEW, XEXPR1), // new |
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SUPER(TokenKind.SUPER, XEXPR1|XDECL), // super -- shouldn't see as rec. But in type parameters |
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285 |
ARROW(TokenKind.ARROW, XEXPR), // -> |
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286 |
COLCOL(TokenKind.COLCOL, XEXPR), // :: |
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287 |
LPAREN(TokenKind.LPAREN, XEXPR), // ( |
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RPAREN(TokenKind.RPAREN, XEXPR), // ) |
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LBRACE(TokenKind.LBRACE, XEXPR), // { |
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RBRACE(TokenKind.RBRACE, XEXPR), // } |
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291 |
LBRACKET(TokenKind.LBRACKET, XEXPR), // [ |
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292 |
RBRACKET(TokenKind.RBRACKET, XEXPR), // ] |
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293 |
ELLIPSIS(TokenKind.ELLIPSIS, XEXPR), // ... |
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294 |
EQ(TokenKind.EQ, XEXPR), // = |
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295 |
BANG(TokenKind.BANG, XEXPR1), // ! |
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296 |
TILDE(TokenKind.TILDE, XEXPR1), // ~ |
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297 |
COLON(TokenKind.COLON, XEXPR|XTERM), // : |
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298 |
EQEQ(TokenKind.EQEQ, XEXPR), // == |
|
299 |
LTEQ(TokenKind.LTEQ, XEXPR), // <= |
|
300 |
GTEQ(TokenKind.GTEQ, XEXPR), // >= |
|
301 |
BANGEQ(TokenKind.BANGEQ, XEXPR), // != |
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302 |
AMPAMP(TokenKind.AMPAMP, XEXPR), // && |
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303 |
BARBAR(TokenKind.BARBAR, XEXPR), // || |
|
304 |
PLUS(TokenKind.PLUS, XEXPR1), // + |
|
305 |
SUB(TokenKind.SUB, XEXPR1), // - |
|
306 |
SLASH(TokenKind.SLASH, XEXPR), // / |
|
307 |
BAR(TokenKind.BAR, XEXPR), // | |
|
308 |
CARET(TokenKind.CARET, XEXPR), // ^ |
|
309 |
PERCENT(TokenKind.PERCENT, XEXPR), // % |
|
310 |
PLUSEQ(TokenKind.PLUSEQ, XEXPR), // += |
|
311 |
SUBEQ(TokenKind.SUBEQ, XEXPR), // -= |
|
312 |
STAREQ(TokenKind.STAREQ, XEXPR), // *= |
|
313 |
SLASHEQ(TokenKind.SLASHEQ, XEXPR), // /= |
|
314 |
AMPEQ(TokenKind.AMPEQ, XEXPR), // &= |
|
315 |
BAREQ(TokenKind.BAREQ, XEXPR), // |= |
|
316 |
CARETEQ(TokenKind.CARETEQ, XEXPR), // ^= |
|
317 |
PERCENTEQ(TokenKind.PERCENTEQ, XEXPR), // %= |
|
318 |
LTLTEQ(TokenKind.LTLTEQ, XEXPR), // <<= |
|
319 |
GTGTEQ(TokenKind.GTGTEQ, XEXPR), // >>= |
|
320 |
GTGTGTEQ(TokenKind.GTGTGTEQ, XEXPR), // >>>= |
|
321 |
||
322 |
// combined/processed kinds |
|
323 |
UNMATCHED(XERRO), |
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324 |
PARENS(XEXPR1|XDECL|XSTMT|XTERM), |
|
325 |
BRACKETS(XEXPR|XDECL|XTERM), |
|
326 |
BRACES(XSTMT1|XEXPR|XTERM); |
|
327 |
||
328 |
static final EnumMap<TokenKind,TK> tokenKindToTKMap = new EnumMap<>(TokenKind.class); |
|
329 |
||
330 |
final TokenKind tokenKind; |
|
331 |
final int belongs; |
|
332 |
||
333 |
TK(int b) { |
|
334 |
this.tokenKind = null; |
|
335 |
this.belongs = b; |
|
336 |
} |
|
337 |
||
338 |
TK(TokenKind tokenKind, int b) { |
|
339 |
this.tokenKind = tokenKind; |
|
340 |
this.belongs = b; |
|
341 |
} |
|
342 |
||
343 |
private static TK tokenKindToTK(TokenKind kind) { |
|
344 |
TK tk = tokenKindToTKMap.get(kind); |
|
345 |
if (tk == null) { |
|
346 |
System.err.printf("No corresponding %s for %s: %s\n", |
|
347 |
TK.class.getCanonicalName(), |
|
348 |
TokenKind.class.getCanonicalName(), |
|
349 |
kind); |
|
350 |
throw new InternalError("No corresponding TK for TokenKind: " + kind); |
|
351 |
} |
|
352 |
return tk; |
|
353 |
} |
|
354 |
||
355 |
boolean isOkToTerminate() { |
|
356 |
return (belongs & XTERM) != 0; |
|
357 |
} |
|
358 |
||
359 |
boolean isExpression() { |
|
360 |
return (belongs & XEXPR) != 0; |
|
361 |
} |
|
362 |
||
363 |
boolean isDeclaration() { |
|
364 |
return (belongs & XDECL) != 0; |
|
365 |
} |
|
366 |
||
367 |
boolean isError() { |
|
368 |
return (belongs & XERRO) != 0; |
|
369 |
} |
|
370 |
||
371 |
boolean isStart() { |
|
372 |
return (belongs & XSTART) != 0; |
|
373 |
} |
|
374 |
||
375 |
/** |
|
376 |
* After construction, check that all compiler TokenKind values have |
|
377 |
* corresponding TK values. |
|
378 |
*/ |
|
379 |
static { |
|
380 |
for (TK tk : TK.values()) { |
|
381 |
if (tk.tokenKind != null) { |
|
382 |
tokenKindToTKMap.put(tk.tokenKind, tk); |
|
383 |
} |
|
384 |
} |
|
385 |
for (TokenKind kind : TokenKind.values()) { |
|
386 |
tokenKindToTK(kind); // assure they can be retrieved without error |
|
387 |
} |
|
388 |
} |
|
389 |
} |
|
390 |
||
391 |
/** |
|
392 |
* A completeness scanner token. |
|
393 |
*/ |
|
394 |
private static class CT { |
|
395 |
||
396 |
/** The token kind */ |
|
397 |
public final TK kind; |
|
398 |
||
399 |
/** The end position of this token */ |
|
400 |
public final int endPos; |
|
401 |
||
402 |
/** The error message **/ |
|
403 |
public final String message; |
|
404 |
||
405 |
private CT(TK tk, Token tok, String msg) { |
|
406 |
this.kind = tk; |
|
407 |
this.endPos = tok.endPos; |
|
408 |
this.message = msg; |
|
409 |
//throw new InternalError(msg); /* for debugging */ |
|
410 |
} |
|
411 |
||
412 |
private CT(TK tk, Token tok) { |
|
413 |
this.kind = tk; |
|
414 |
this.endPos = tok.endPos; |
|
415 |
this.message = null; |
|
416 |
} |
|
417 |
||
418 |
private CT(TK tk, int endPos) { |
|
419 |
this.kind = tk; |
|
420 |
this.endPos = endPos; |
|
421 |
this.message = null; |
|
422 |
} |
|
423 |
} |
|
424 |
||
425 |
/** |
|
426 |
* Look for matching tokens (like parens) and other special cases, like "new" |
|
427 |
*/ |
|
428 |
private static class Matched implements Iterator<CT> { |
|
429 |
||
430 |
private final Scanner scanner; |
|
431 |
private Token current; |
|
432 |
private CT prevCT; |
|
433 |
private CT currentCT; |
|
434 |
private final Deque<Token> stack = new ArrayDeque<>(); |
|
435 |
||
436 |
Matched(Scanner scanner) { |
|
437 |
this.scanner = scanner; |
|
438 |
advance(); |
|
439 |
prevCT = currentCT = new CT(SEMI, 0); // So is valid for testing |
|
440 |
} |
|
441 |
||
442 |
@Override |
|
443 |
public boolean hasNext() { |
|
444 |
return currentCT.kind != EOF; |
|
445 |
} |
|
446 |
||
447 |
private Token advance() { |
|
448 |
Token prev = current; |
|
449 |
scanner.nextToken(); |
|
450 |
current = scanner.token(); |
|
451 |
return prev; |
|
452 |
} |
|
453 |
||
454 |
@Override |
|
455 |
public CT next() { |
|
456 |
prevCT = currentCT; |
|
457 |
currentCT = nextCT(); |
|
458 |
return currentCT; |
|
459 |
} |
|
460 |
||
461 |
private CT match(TK tk, TokenKind open) { |
|
462 |
Token tok = advance(); |
|
463 |
db("match desired-tk=%s, open=%s, seen-tok=%s", tk, open, tok.kind); |
|
464 |
if (stack.isEmpty()) { |
|
465 |
return new CT(ERROR, tok, "Encountered '" + tok + "' with no opening '" + open + "'"); |
|
466 |
} |
|
467 |
Token p = stack.pop(); |
|
468 |
if (p.kind != open) { |
|
469 |
return new CT(ERROR, tok, "No match for '" + p + "' instead encountered '" + tok + "'"); |
|
470 |
} |
|
471 |
return new CT(tk, tok); |
|
472 |
} |
|
473 |
||
474 |
private void db(String format, Object ... args) { |
|
475 |
// System.err.printf(format, args); |
|
476 |
// System.err.printf(" -- stack("); |
|
477 |
// if (stack.isEmpty()) { |
|
478 |
// |
|
479 |
// } else { |
|
480 |
// for (Token tok : stack) { |
|
481 |
// System.err.printf("%s ", tok.kind); |
|
482 |
// } |
|
483 |
// } |
|
484 |
// System.err.printf(") current=%s / currentCT=%s\n", current.kind, currentCT.kind); |
|
485 |
} |
|
486 |
||
487 |
/** |
|
488 |
* @return the next scanner token |
|
489 |
*/ |
|
490 |
private CT nextCT() { |
|
491 |
// TODO Annotations? |
|
492 |
TK prevTK = currentCT.kind; |
|
493 |
while (true) { |
|
494 |
db("nextCT"); |
|
495 |
CT ct; |
|
496 |
switch (current.kind) { |
|
497 |
case EOF: |
|
498 |
db("eof"); |
|
499 |
if (stack.isEmpty()) { |
|
500 |
ct = new CT(EOF, current); |
|
501 |
} else { |
|
502 |
TokenKind unmatched = stack.pop().kind; |
|
503 |
stack.clear(); // So we will get EOF next time |
|
504 |
ct = new CT(UNMATCHED, current, "Unmatched " + unmatched); |
|
505 |
} |
|
506 |
break; |
|
507 |
case LPAREN: |
|
508 |
case LBRACE: |
|
509 |
case LBRACKET: |
|
510 |
stack.push(advance()); |
|
511 |
prevTK = SEMI; // new start |
|
512 |
continue; |
|
513 |
case RPAREN: |
|
514 |
ct = match(PARENS, TokenKind.LPAREN); |
|
515 |
break; |
|
516 |
case RBRACE: |
|
517 |
ct = match(BRACES, TokenKind.LBRACE); |
|
518 |
break; |
|
519 |
case RBRACKET: |
|
520 |
ct = match(BRACKETS, TokenKind.LBRACKET); |
|
521 |
break; |
|
522 |
default: |
|
523 |
ct = new CT(TK.tokenKindToTK(current.kind), advance()); |
|
524 |
break; |
|
525 |
} |
|
526 |
if (ct.kind.isStart() && !prevTK.isOkToTerminate()) { |
|
527 |
return new CT(ERROR, current, "No '" + prevTK + "' before '" + ct.kind + "'"); |
|
528 |
} |
|
529 |
if (stack.isEmpty() || ct.kind.isError()) { |
|
530 |
return ct; |
|
531 |
} |
|
532 |
prevTK = ct.kind; |
|
533 |
} |
|
534 |
} |
|
535 |
} |
|
536 |
||
537 |
/** |
|
538 |
* Fuzzy parser based on token kinds |
|
539 |
*/ |
|
540 |
private static class Parser { |
|
541 |
||
542 |
final Matched in; |
|
543 |
CT token; |
|
544 |
Completeness checkResult; |
|
545 |
||
546 |
final JShell proc; |
|
547 |
final String scannedInput; |
|
548 |
||
549 |
||
550 |
||
551 |
Parser(Matched in, JShell proc, String scannedInput) { |
|
552 |
this.in = in; |
|
553 |
nextToken(); |
|
554 |
||
555 |
this.proc = proc; |
|
556 |
this.scannedInput = scannedInput; |
|
557 |
} |
|
558 |
||
559 |
final void nextToken() { |
|
560 |
in.next(); |
|
561 |
token = in.currentCT; |
|
562 |
} |
|
563 |
||
564 |
boolean shouldAbort(TK tk) { |
|
565 |
if (token.kind == tk) { |
|
566 |
nextToken(); |
|
567 |
return false; |
|
568 |
} |
|
569 |
switch (token.kind) { |
|
570 |
case EOF: |
|
571 |
checkResult = ((tk == SEMI) && in.prevCT.kind.isOkToTerminate()) |
|
572 |
? Completeness.COMPLETE_WITH_SEMI |
|
573 |
: Completeness.DEFINITELY_INCOMPLETE; |
|
574 |
return true; |
|
575 |
case UNMATCHED: |
|
576 |
checkResult = Completeness.DEFINITELY_INCOMPLETE; |
|
577 |
return true; |
|
578 |
default: |
|
579 |
checkResult = error(); |
|
580 |
return true; |
|
581 |
||
582 |
} |
|
583 |
} |
|
584 |
||
585 |
Completeness lastly(TK tk) { |
|
586 |
if (shouldAbort(tk)) return checkResult; |
|
587 |
return Completeness.COMPLETE; |
|
588 |
} |
|
589 |
||
590 |
Completeness optionalFinalSemi() { |
|
591 |
if (!shouldAbort(SEMI)) return Completeness.COMPLETE; |
|
592 |
if (checkResult == Completeness.COMPLETE_WITH_SEMI) return Completeness.COMPLETE; |
|
593 |
return checkResult; |
|
594 |
} |
|
595 |
||
596 |
boolean shouldAbort(Completeness flags) { |
|
597 |
checkResult = flags; |
|
598 |
return flags != Completeness.COMPLETE; |
|
599 |
} |
|
600 |
||
601 |
public Completeness parseUnit() { |
|
602 |
//System.err.printf("%s: belongs %o XANY1 %o\n", token.kind, token.kind.belongs, token.kind.belongs & XANY1); |
|
603 |
switch (token.kind.belongs & XANY1) { |
|
604 |
case XEXPR1o: |
|
605 |
return parseExpressionOptionalSemi(); |
|
606 |
case XSTMT1o: { |
|
607 |
Completeness stat = parseSimpleStatement(); |
|
608 |
return stat==null? error() : stat; |
|
609 |
} |
|
610 |
case XDECL1o: |
|
611 |
return parseDeclaration(); |
|
612 |
case XSTMT1o | XDECL1o: |
|
613 |
case XEXPR1o | XDECL1o: |
|
614 |
return disambiguateDeclarationVsExpression(); |
|
615 |
case 0: |
|
616 |
if ((token.kind.belongs & XERRO) != 0) { |
|
617 |
return parseExpressionStatement(); // Let this gen the status |
|
618 |
} |
|
619 |
return error(); |
|
620 |
default: |
|
621 |
throw new InternalError("Case not covered " + token.kind.belongs + " in " + token.kind); |
|
622 |
} |
|
623 |
} |
|
624 |
||
625 |
public Completeness parseDeclaration() { |
|
626 |
boolean isImport = token.kind == IMPORT; |
|
627 |
while (token.kind.isDeclaration()) { |
|
628 |
nextToken(); |
|
629 |
} |
|
630 |
switch (token.kind) { |
|
631 |
case EQ: |
|
632 |
// Check for array initializer |
|
633 |
nextToken(); |
|
634 |
if (token.kind == BRACES) { |
|
635 |
nextToken(); |
|
636 |
return lastly(SEMI); |
|
637 |
} |
|
638 |
return parseExpressionStatement(); |
|
639 |
case BRACES: |
|
640 |
case SEMI: |
|
641 |
nextToken(); |
|
642 |
return Completeness.COMPLETE; |
|
643 |
case UNMATCHED: |
|
644 |
nextToken(); |
|
645 |
return Completeness.DEFINITELY_INCOMPLETE; |
|
646 |
case EOF: |
|
647 |
switch (in.prevCT.kind) { |
|
648 |
case BRACES: |
|
649 |
case SEMI: |
|
650 |
return Completeness.COMPLETE; |
|
651 |
case IDENTIFIER: |
|
652 |
case BRACKETS: |
|
653 |
return Completeness.COMPLETE_WITH_SEMI; |
|
654 |
case STAR: |
|
655 |
if (isImport) { |
|
656 |
return Completeness.COMPLETE_WITH_SEMI; |
|
657 |
} else { |
|
658 |
return Completeness.DEFINITELY_INCOMPLETE; |
|
659 |
} |
|
660 |
default: |
|
661 |
return Completeness.DEFINITELY_INCOMPLETE; |
|
662 |
} |
|
663 |
default: |
|
664 |
return error(); |
|
665 |
} |
|
666 |
} |
|
667 |
||
668 |
public Completeness disambiguateDeclarationVsExpression() { |
|
669 |
// String folding messes up position information. |
|
670 |
ParseTask pt = proc.taskFactory.new ParseTask(scannedInput); |
|
671 |
List<? extends Tree> units = pt.units(); |
|
672 |
if (units.isEmpty()) { |
|
673 |
return error(); |
|
674 |
} |
|
675 |
Tree unitTree = units.get(0); |
|
676 |
switch (unitTree.getKind()) { |
|
677 |
case EXPRESSION_STATEMENT: |
|
678 |
return parseExpressionOptionalSemi(); |
|
679 |
case LABELED_STATEMENT: |
|
680 |
if (shouldAbort(IDENTIFIER)) return checkResult; |
|
681 |
if (shouldAbort(COLON)) return checkResult; |
|
682 |
return parseStatement(); |
|
683 |
case VARIABLE: |
|
684 |
case IMPORT: |
|
685 |
case CLASS: |
|
686 |
case ENUM: |
|
687 |
case ANNOTATION_TYPE: |
|
688 |
case INTERFACE: |
|
689 |
case METHOD: |
|
690 |
return parseDeclaration(); |
|
691 |
default: |
|
692 |
return error(); |
|
693 |
} |
|
694 |
} |
|
695 |
||
696 |
// public Status parseExpressionOrDeclaration() { |
|
697 |
// if (token.kind == IDENTIFIER) { |
|
698 |
// nextToken(); |
|
699 |
// switch (token.kind) { |
|
700 |
// case IDENTIFIER: |
|
701 |
// return parseDeclaration(); |
|
702 |
// } |
|
703 |
// } |
|
704 |
// while (token.kind.isExpressionOrDeclaration()) { |
|
705 |
// if (!token.kind.isExpression()) { |
|
706 |
// return parseDeclaration(); |
|
707 |
// } |
|
708 |
// if (!token.kind.isDeclaration()) { |
|
709 |
// // Expression not declaration |
|
710 |
// if (token.kind == EQ) { |
|
711 |
// // Check for array initializer |
|
712 |
// nextToken(); |
|
713 |
// if (token.kind == BRACES) { |
|
714 |
// nextToken(); |
|
715 |
// return lastly(SEMI); |
|
716 |
// } |
|
717 |
// } |
|
718 |
// return parseExpressionStatement(); |
|
719 |
// } |
|
720 |
// nextToken(); |
|
721 |
// } |
|
722 |
// switch (token.kind) { |
|
723 |
// case BRACES: |
|
724 |
// case SEMI: |
|
725 |
// nextToken(); |
|
726 |
// return Status.COMPLETE; |
|
727 |
// case UNMATCHED: |
|
728 |
// nextToken(); |
|
729 |
// return Status.DEFINITELY_INCOMPLETE; |
|
730 |
// case EOF: |
|
731 |
// if (in.prevCT.kind.isOkToTerminate()) { |
|
732 |
// return Status.COMPLETE_WITH_SEMI; |
|
733 |
// } else { |
|
734 |
// return Status.DEFINITELY_INCOMPLETE; |
|
735 |
// } |
|
736 |
// default: |
|
737 |
// return error(); |
|
738 |
// } |
|
739 |
// } |
|
740 |
||
741 |
public Completeness parseExpressionStatement() { |
|
742 |
if (shouldAbort(parseExpression())) return checkResult; |
|
743 |
return lastly(SEMI); |
|
744 |
} |
|
745 |
||
746 |
public Completeness parseExpressionOptionalSemi() { |
|
747 |
if (shouldAbort(parseExpression())) return checkResult; |
|
748 |
return optionalFinalSemi(); |
|
749 |
} |
|
750 |
||
751 |
public Completeness parseExpression() { |
|
752 |
while (token.kind.isExpression()) |
|
753 |
nextToken(); |
|
754 |
return Completeness.COMPLETE; |
|
755 |
} |
|
756 |
||
757 |
public Completeness parseStatement() { |
|
758 |
Completeness stat = parseSimpleStatement(); |
|
759 |
if (stat == null) { |
|
760 |
return parseExpressionStatement(); |
|
761 |
} |
|
762 |
return stat; |
|
763 |
} |
|
764 |
||
765 |
/** |
|
766 |
* Statement = Block | IF ParExpression Statement [ELSE Statement] | FOR |
|
767 |
* "(" ForInitOpt ";" [Expression] ";" ForUpdateOpt ")" Statement | FOR |
|
768 |
* "(" FormalParameter : Expression ")" Statement | WHILE ParExpression |
|
769 |
* Statement | DO Statement WHILE ParExpression ";" | TRY Block ( |
|
770 |
* Catches | [Catches] FinallyPart ) | TRY "(" ResourceSpecification |
|
771 |
* ";"opt ")" Block [Catches] [FinallyPart] | SWITCH ParExpression "{" |
|
772 |
* SwitchBlockStatementGroups "}" | SYNCHRONIZED ParExpression Block | |
|
773 |
* RETURN [Expression] ";" | THROW Expression ";" | BREAK [Ident] ";" | |
|
774 |
* CONTINUE [Ident] ";" | ASSERT Expression [ ":" Expression ] ";" | ";" |
|
775 |
*/ |
|
776 |
public Completeness parseSimpleStatement() { |
|
777 |
switch (token.kind) { |
|
778 |
case BRACES: |
|
779 |
return lastly(BRACES); |
|
780 |
case IF: { |
|
781 |
nextToken(); |
|
782 |
if (shouldAbort(PARENS)) return checkResult; |
|
783 |
Completeness thenpart = parseStatement(); |
|
784 |
if (shouldAbort(thenpart)) return thenpart; |
|
785 |
if (token.kind == ELSE) { |
|
786 |
nextToken(); |
|
787 |
return parseStatement(); |
|
788 |
} |
|
789 |
return thenpart; |
|
790 |
||
791 |
} |
|
792 |
case FOR: { |
|
793 |
nextToken(); |
|
794 |
if (shouldAbort(PARENS)) return checkResult; |
|
795 |
if (shouldAbort(parseStatement())) return checkResult; |
|
796 |
return Completeness.COMPLETE; |
|
797 |
} |
|
798 |
case WHILE: { |
|
799 |
nextToken(); |
|
800 |
if (shouldAbort(PARENS)) return error(); |
|
801 |
return parseStatement(); |
|
802 |
} |
|
803 |
case DO: { |
|
804 |
nextToken(); |
|
805 |
switch (parseStatement()) { |
|
806 |
case DEFINITELY_INCOMPLETE: |
|
807 |
case CONSIDERED_INCOMPLETE: |
|
808 |
case COMPLETE_WITH_SEMI: |
|
809 |
return Completeness.DEFINITELY_INCOMPLETE; |
|
810 |
case UNKNOWN: |
|
811 |
return error(); |
|
812 |
case COMPLETE: |
|
813 |
break; |
|
814 |
} |
|
815 |
if (shouldAbort(WHILE)) return checkResult; |
|
816 |
if (shouldAbort(PARENS)) return checkResult; |
|
817 |
return lastly(SEMI); |
|
818 |
} |
|
819 |
case TRY: { |
|
820 |
boolean hasResources = false; |
|
821 |
nextToken(); |
|
822 |
if (token.kind == PARENS) { |
|
823 |
nextToken(); |
|
824 |
hasResources = true; |
|
825 |
} |
|
826 |
if (shouldAbort(BRACES)) return checkResult; |
|
827 |
if (token.kind == CATCH || token.kind == FINALLY) { |
|
828 |
while (token.kind == CATCH) { |
|
829 |
if (shouldAbort(CATCH)) return checkResult; |
|
830 |
if (shouldAbort(PARENS)) return checkResult; |
|
831 |
if (shouldAbort(BRACES)) return checkResult; |
|
832 |
} |
|
833 |
if (token.kind == FINALLY) { |
|
834 |
if (shouldAbort(FINALLY)) return checkResult; |
|
835 |
if (shouldAbort(BRACES)) return checkResult; |
|
836 |
} |
|
837 |
} else if (!hasResources) { |
|
838 |
if (token.kind == EOF) { |
|
839 |
return Completeness.DEFINITELY_INCOMPLETE; |
|
840 |
} else { |
|
841 |
return error(); |
|
842 |
} |
|
843 |
} |
|
844 |
return Completeness.COMPLETE; |
|
845 |
} |
|
846 |
case SWITCH: { |
|
847 |
nextToken(); |
|
848 |
if (shouldAbort(PARENS)) return checkResult; |
|
849 |
return lastly(BRACES); |
|
850 |
} |
|
851 |
case SYNCHRONIZED: { |
|
852 |
nextToken(); |
|
853 |
if (shouldAbort(PARENS)) return checkResult; |
|
854 |
return lastly(BRACES); |
|
855 |
} |
|
856 |
case THROW: { |
|
857 |
nextToken(); |
|
858 |
if (shouldAbort(parseExpression())) return checkResult; |
|
859 |
return lastly(SEMI); |
|
860 |
} |
|
861 |
case SEMI: |
|
862 |
return lastly(SEMI); |
|
863 |
case ASSERT: |
|
864 |
nextToken(); |
|
865 |
// Crude expression parsing just happily eats the optional colon |
|
866 |
return parseExpressionStatement(); |
|
867 |
case RETURN: |
|
868 |
case BREAK: |
|
869 |
case CONTINUE: |
|
870 |
nextToken(); |
|
871 |
return parseExpressionStatement(); |
|
872 |
// What are these doing here? |
|
873 |
case ELSE: |
|
874 |
case FINALLY: |
|
875 |
case CATCH: |
|
876 |
return error(); |
|
877 |
case EOF: |
|
878 |
return Completeness.CONSIDERED_INCOMPLETE; |
|
879 |
default: |
|
880 |
return null; |
|
881 |
} |
|
882 |
} |
|
883 |
} |
|
884 |
} |