1 /*
2 * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.tree;
27
28 import java.io.*;
29
30 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
31 import com.sun.source.tree.ModuleTree.ModuleKind;
32 import com.sun.tools.javac.code.*;
33 import com.sun.tools.javac.tree.JCTree.*;
34 import com.sun.tools.javac.util.*;
35
36 import static com.sun.tools.javac.code.Flags.*;
37 import static com.sun.tools.javac.code.Flags.ANNOTATION;
38 import static com.sun.tools.javac.tree.JCTree.Tag.*;
39
40 /** Prints out a tree as an indented Java source program.
41 *
42 * <p><b>This is NOT part of any supported API.
43 * If you write code that depends on this, you do so at your own risk.
44 * This code and its internal interfaces are subject to change or
45 * deletion without notice.</b>
46 */
47 public class Pretty extends JCTree.Visitor {
48
49 public Pretty(Writer out, boolean sourceOutput) {
50 this.out = out;
51 this.sourceOutput = sourceOutput;
52 }
53
54 /** Set when we are producing source output. If we're not
55 * producing source output, we can sometimes give more detail in
56 * the output even though that detail would not be valid java
57 * source.
58 */
59 private final boolean sourceOutput;
60
61 /** The output stream on which trees are printed.
62 */
63 Writer out;
64
65 /** Indentation width (can be reassigned from outside).
66 */
67 public int width = 4;
68
69 /** The current left margin.
70 */
71 int lmargin = 0;
72
73 /** The enclosing class name.
74 */
75 Name enclClassName;
76
77 /** A table mapping trees to their documentation comments
78 * (can be null)
79 */
80 DocCommentTable docComments = null;
81
82 /**
83 * A string sequence to be used when Pretty output should be constrained
84 * to fit into a given size
85 */
86 private static final String trimSequence = "[...]";
87
88 /**
89 * Max number of chars to be generated when output should fit into a single line
90 */
91 private static final int PREFERRED_LENGTH = 20;
92
93 /** Align code to be indented to left margin.
94 */
95 void align() throws IOException {
96 for (int i = 0; i < lmargin; i++) out.write(" ");
97 }
98
99 /** Increase left margin by indentation width.
100 */
101 void indent() {
102 lmargin = lmargin + width;
103 }
104
105 /** Decrease left margin by indentation width.
106 */
107 void undent() {
108 lmargin = lmargin - width;
109 }
110
111 /** Enter a new precedence level. Emit a `(' if new precedence level
112 * is less than precedence level so far.
113 * @param contextPrec The precedence level in force so far.
114 * @param ownPrec The new precedence level.
115 */
116 void open(int contextPrec, int ownPrec) throws IOException {
117 if (ownPrec < contextPrec) out.write("(");
118 }
119
120 /** Leave precedence level. Emit a `(' if inner precedence level
121 * is less than precedence level we revert to.
122 * @param contextPrec The precedence level we revert to.
123 * @param ownPrec The inner precedence level.
124 */
125 void close(int contextPrec, int ownPrec) throws IOException {
126 if (ownPrec < contextPrec) out.write(")");
127 }
128
129 /** Print string, replacing all non-ascii character with unicode escapes.
130 */
131 public void print(Object s) throws IOException {
132 out.write(Convert.escapeUnicode(s.toString()));
133 }
134
135 /** Print new line.
136 */
137 public void println() throws IOException {
138 out.write(lineSep);
139 }
140
141 public static String toSimpleString(JCTree tree) {
142 return toSimpleString(tree, PREFERRED_LENGTH);
143 }
144
145 public static String toSimpleString(JCTree tree, int maxLength) {
146 StringWriter s = new StringWriter();
147 try {
148 new Pretty(s, false).printExpr(tree);
149 }
150 catch (IOException e) {
151 // should never happen, because StringWriter is defined
152 // never to throw any IOExceptions
153 throw new AssertionError(e);
154 }
155 //we need to (i) replace all line terminators with a space and (ii) remove
156 //occurrences of 'missing' in the Pretty output (generated when types are missing)
157 String res = s.toString().trim().replaceAll("\\s+", " ").replaceAll("/\\*missing\\*/", "");
158 if (res.length() < maxLength) {
159 return res;
160 } else {
161 int head = (maxLength - trimSequence.length()) * 2 / 3;
162 int tail = maxLength - trimSequence.length() - head;
163 return res.substring(0, head) + trimSequence + res.substring(res.length() - tail);
164 }
165 }
166
167 String lineSep = System.getProperty("line.separator");
168
169 /* ************************************************************************
170 * Traversal methods
171 *************************************************************************/
172
173 /** Exception to propagate IOException through visitXYZ methods */
174 private static class UncheckedIOException extends Error {
175 static final long serialVersionUID = -4032692679158424751L;
176 UncheckedIOException(IOException e) {
177 super(e.getMessage(), e);
178 }
179 }
180
181 /** Visitor argument: the current precedence level.
182 */
183 int prec;
184
185 /** Visitor method: print expression tree.
186 * @param prec The current precedence level.
187 */
188 public void printExpr(JCTree tree, int prec) throws IOException {
189 int prevPrec = this.prec;
190 try {
191 this.prec = prec;
192 if (tree == null) print("/*missing*/");
193 else {
194 tree.accept(this);
195 }
196 } catch (UncheckedIOException ex) {
197 IOException e = new IOException(ex.getMessage());
198 e.initCause(ex);
199 throw e;
200 } finally {
201 this.prec = prevPrec;
202 }
203 }
204
205 /** Derived visitor method: print expression tree at minimum precedence level
206 * for expression.
207 */
208 public void printExpr(JCTree tree) throws IOException {
209 printExpr(tree, TreeInfo.noPrec);
210 }
211
212 /** Derived visitor method: print statement tree.
213 */
214 public void printStat(JCTree tree) throws IOException {
215 printExpr(tree, TreeInfo.notExpression);
216 }
217
218 /** Derived visitor method: print list of expression trees, separated by given string.
219 * @param sep the separator string
220 */
221 public <T extends JCTree> void printExprs(List<T> trees, String sep) throws IOException {
222 if (trees.nonEmpty()) {
223 printExpr(trees.head);
224 for (List<T> l = trees.tail; l.nonEmpty(); l = l.tail) {
225 print(sep);
226 printExpr(l.head);
227 }
228 }
229 }
230
231 /** Derived visitor method: print list of expression trees, separated by commas.
232 */
233 public <T extends JCTree> void printExprs(List<T> trees) throws IOException {
234 printExprs(trees, ", ");
235 }
236
237
238 /** Derived visitor method: print pattern.
239 */
240
241 public void printPattern(JCTree tree) throws IOException {
242 printExpr(tree);
243 }
244
245 /** Derived visitor method: print list of statements, each on a separate line.
246 */
247 public void printStats(List<? extends JCTree> trees) throws IOException {
248 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail) {
249 align();
250 printStat(l.head);
251 println();
252 }
253 }
254
255 /** Print a set of modifiers.
256 */
257 public void printFlags(long flags) throws IOException {
258 if ((flags & SYNTHETIC) != 0) print("/*synthetic*/ ");
259 print(TreeInfo.flagNames(flags));
260 if ((flags & ExtendedStandardFlags) != 0) print(" ");
261 if ((flags & ANNOTATION) != 0) print("@");
262 }
263
264 public void printAnnotations(List<JCAnnotation> trees) throws IOException {
265 for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail) {
266 printStat(l.head);
267 println();
268 align();
269 }
270 }
271
272 public void printTypeAnnotations(List<JCAnnotation> trees) throws IOException {
273 for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail) {
274 printExpr(l.head);
275 print(" ");
276 }
277 }
278
279 /** Print documentation comment, if it exists
280 * @param tree The tree for which a documentation comment should be printed.
281 */
282 public void printDocComment(JCTree tree) throws IOException {
283 if (docComments != null) {
284 String dc = docComments.getCommentText(tree);
285 if (dc != null) {
286 print("/**"); println();
287 int pos = 0;
288 int endpos = lineEndPos(dc, pos);
289 while (pos < dc.length()) {
290 align();
291 print(" *");
292 if (pos < dc.length() && dc.charAt(pos) > ' ') print(" ");
293 print(dc.substring(pos, endpos)); println();
294 pos = endpos + 1;
295 endpos = lineEndPos(dc, pos);
296 }
297 align(); print(" */"); println();
298 align();
299 }
300 }
301 }
302 //where
303 static int lineEndPos(String s, int start) {
304 int pos = s.indexOf('\n', start);
305 if (pos < 0) pos = s.length();
306 return pos;
307 }
308
309 /** If type parameter list is non-empty, print it enclosed in
310 * {@literal "<...>"} brackets.
311 */
312 public void printTypeParameters(List<JCTypeParameter> trees) throws IOException {
313 if (trees.nonEmpty()) {
314 print("<");
315 printExprs(trees);
316 print(">");
317 }
318 }
319
320 /** Print a block.
321 */
322 public void printBlock(List<? extends JCTree> stats) throws IOException {
323 print("{");
324 println();
325 indent();
326 printStats(stats);
327 undent();
328 align();
329 print("}");
330 }
331
332 /** Print a block.
333 */
334 public void printEnumBody(List<JCTree> stats) throws IOException {
335 print("{");
336 println();
337 indent();
338 boolean first = true;
339 for (List<JCTree> l = stats; l.nonEmpty(); l = l.tail) {
340 if (isEnumerator(l.head)) {
341 if (!first) {
342 print(",");
343 println();
344 }
345 align();
346 printStat(l.head);
347 first = false;
348 }
349 }
350 print(";");
351 println();
352 for (List<JCTree> l = stats; l.nonEmpty(); l = l.tail) {
353 if (!isEnumerator(l.head)) {
354 align();
355 printStat(l.head);
356 println();
357 }
358 }
359 undent();
360 align();
361 print("}");
362 }
363
364 /** Is the given tree an enumerator definition? */
365 boolean isEnumerator(JCTree t) {
366 return t.hasTag(VARDEF) && (((JCVariableDecl) t).mods.flags & ENUM) != 0;
367 }
368
369 /** Print unit consisting of package clause and import statements in toplevel,
370 * followed by class definition. if class definition == null,
371 * print all definitions in toplevel.
372 * @param tree The toplevel tree
373 * @param cdef The class definition, which is assumed to be part of the
374 * toplevel tree.
375 */
376 public void printUnit(JCCompilationUnit tree, JCClassDecl cdef) throws IOException {
377 docComments = tree.docComments;
378 printDocComment(tree);
379
380 boolean firstImport = true;
381 for (List<JCTree> l = tree.defs;
382 l.nonEmpty() &&
383 (cdef == null ||
384 l.head.hasTag(IMPORT) || l.head.hasTag(PACKAGEDEF));
385 l = l.tail) {
386 if (l.head.hasTag(IMPORT)) {
387 JCImport imp = (JCImport)l.head;
388 Name name = TreeInfo.name(imp.qualid);
389 if (name == name.table.names.asterisk ||
390 cdef == null ||
391 isUsed(TreeInfo.symbol(imp.qualid), cdef)) {
392 if (firstImport) {
393 firstImport = false;
394 println();
395 }
396 printStat(imp);
397 }
398 } else {
399 printStat(l.head);
400 }
401 }
402 if (cdef != null) {
403 printStat(cdef);
404 println();
405 }
406 }
407 // where
408 boolean isUsed(final Symbol t, JCTree cdef) {
409 class UsedVisitor extends TreeScanner {
410 public void scan(JCTree tree) {
411 if (tree!=null && !result) tree.accept(this);
412 }
413 boolean result = false;
414 public void visitIdent(JCIdent tree) {
415 if (tree.sym == t) result = true;
416 }
417 }
418 UsedVisitor v = new UsedVisitor();
419 v.scan(cdef);
420 return v.result;
421 }
422
423 /**************************************************************************
424 * Visitor methods
425 *************************************************************************/
426
427 public void visitTopLevel(JCCompilationUnit tree) {
428 try {
429 printUnit(tree, null);
430 } catch (IOException e) {
431 throw new UncheckedIOException(e);
432 }
433 }
434
435 public void visitPackageDef(JCPackageDecl tree) {
436 try {
437 printDocComment(tree);
438 printAnnotations(tree.annotations);
439 if (tree.pid != null) {
440 print("package ");
441 printExpr(tree.pid);
442 print(";");
443 println();
444 }
445 } catch (IOException e) {
446 throw new UncheckedIOException(e);
447 }
448 }
449
450 @Override
451 public void visitModuleDef(JCModuleDecl tree) {
452 try {
453 printDocComment(tree);
454 printAnnotations(tree.mods.annotations);
455 if (tree.getModuleType() == ModuleKind.OPEN) {
456 print("open ");
457 }
458 print("module ");
459 printExpr(tree.qualId);
460 if (tree.directives == null) {
461 print(";");
462 } else {
463 print(" ");
464 printBlock(tree.directives);
465 }
466 println();
467 } catch (IOException e) {
468 throw new UncheckedIOException(e);
469 }
470 }
471
472 @Override
473 public void visitExports(JCExports tree) {
474 try {
475 print("exports ");
476 printExpr(tree.qualid);
477 if (tree.moduleNames != null) {
478 print(" to ");
479 printExprs(tree.moduleNames);
480 }
481 print(";");
482 } catch (IOException e) {
483 throw new UncheckedIOException(e);
484 }
485 }
486
487 @Override
488 public void visitOpens(JCOpens tree) {
489 try {
490 print("opens ");
491 printExpr(tree.qualid);
492 if (tree.moduleNames != null) {
493 print(" to ");
494 printExprs(tree.moduleNames);
495 }
496 print(";");
497 } catch (IOException e) {
498 throw new UncheckedIOException(e);
499 }
500 }
501
502 @Override
503 public void visitProvides(JCProvides tree) {
504 try {
505 print("provides ");
506 printExpr(tree.serviceName);
507 print(" with ");
508 printExprs(tree.implNames);
509 print(";");
510 } catch (IOException e) {
511 throw new UncheckedIOException(e);
512 }
513 }
514
515 @Override
516 public void visitRequires(JCRequires tree) {
517 try {
518 print("requires ");
519 if (tree.isStaticPhase)
520 print("static ");
521 if (tree.isTransitive)
522 print("transitive ");
523 printExpr(tree.moduleName);
524 print(";");
525 } catch (IOException e) {
526 throw new UncheckedIOException(e);
527 }
528 }
529
530 @Override
531 public void visitUses(JCUses tree) {
532 try {
533 print("uses ");
534 printExpr(tree.qualid);
535 print(";");
536 } catch (IOException e) {
537 throw new UncheckedIOException(e);
538 }
539 }
540
541 public void visitImport(JCImport tree) {
542 try {
543 print("import ");
544 if (tree.staticImport) print("static ");
545 printExpr(tree.qualid);
546 print(";");
547 println();
548 } catch (IOException e) {
549 throw new UncheckedIOException(e);
550 }
551 }
552
553 public void visitClassDef(JCClassDecl tree) {
554 try {
555 println(); align();
556 printDocComment(tree);
557 printAnnotations(tree.mods.annotations);
558 printFlags(tree.mods.flags & ~INTERFACE);
559 Name enclClassNamePrev = enclClassName;
560 enclClassName = tree.name;
561 if ((tree.mods.flags & INTERFACE) != 0) {
562 print("interface " + tree.name);
563 printTypeParameters(tree.typarams);
564 if (tree.implementing.nonEmpty()) {
565 print(" extends ");
566 printExprs(tree.implementing);
567 }
568 if (tree.permitting.nonEmpty()) {
569 print(" permits ");
570 printExprs(tree.permitting);
571 }
572 } else {
573 if ((tree.mods.flags & ENUM) != 0)
574 print("enum " + tree.name);
575 else
576 print("class " + tree.name);
577 printTypeParameters(tree.typarams);
578 if (tree.extending != null) {
579 print(" extends ");
580 printExpr(tree.extending);
581 }
582 if (tree.implementing.nonEmpty()) {
583 print(" implements ");
584 printExprs(tree.implementing);
585 }
586 if (tree.permitting.nonEmpty()) {
587 print(" permits ");
588 printExprs(tree.permitting);
589 }
590 }
591 print(" ");
592 if ((tree.mods.flags & ENUM) != 0) {
593 printEnumBody(tree.defs);
594 } else {
595 printBlock(tree.defs);
596 }
597 enclClassName = enclClassNamePrev;
598 } catch (IOException e) {
599 throw new UncheckedIOException(e);
600 }
601 }
602
603 public void visitMethodDef(JCMethodDecl tree) {
604 try {
605 // when producing source output, omit anonymous constructors
606 if (tree.name == tree.name.table.names.init &&
607 enclClassName == null &&
608 sourceOutput) return;
609 println(); align();
610 printDocComment(tree);
611 printExpr(tree.mods);
612 printTypeParameters(tree.typarams);
613 if (tree.name == tree.name.table.names.init) {
614 print(enclClassName != null ? enclClassName : tree.name);
615 } else {
616 printExpr(tree.restype);
617 print(" " + tree.name);
618 }
619 print("(");
620 if (tree.recvparam!=null) {
621 printExpr(tree.recvparam);
622 if (tree.params.size() > 0) {
623 print(", ");
624 }
625 }
626 printExprs(tree.params);
627 print(")");
628 if (tree.thrown.nonEmpty()) {
629 print(" throws ");
630 printExprs(tree.thrown);
631 }
632 if (tree.defaultValue != null) {
633 print(" default ");
634 printExpr(tree.defaultValue);
635 }
636 if (tree.body != null) {
637 print(" ");
638 printStat(tree.body);
639 } else {
640 print(";");
641 }
642 } catch (IOException e) {
643 throw new UncheckedIOException(e);
644 }
645 }
646
647 public void visitVarDef(JCVariableDecl tree) {
648 try {
649 if (docComments != null && docComments.hasComment(tree)) {
650 println(); align();
651 }
652 printDocComment(tree);
653 if ((tree.mods.flags & ENUM) != 0) {
654 print("/*public static final*/ ");
655 print(tree.name);
656 if (tree.init != null) {
657 if (tree.init.hasTag(NEWCLASS)) {
658 JCNewClass init = (JCNewClass) tree.init;
659 if (sourceOutput) {
660 print(" /*enum*/ ");
661 if (init.args != null && init.args.nonEmpty()) {
662 print("(");
663 print(init.args);
664 print(")");
665 }
666 if (init.def != null && init.def.defs != null) {
667 print(" ");
668 printBlock(init.def.defs);
669 }
670 return;
671 }else {
672 print(" /* = ");
673 print("new ");
674 if (init.def != null && init.def.mods.annotations.nonEmpty()) {
675 printTypeAnnotations(init.def.mods.annotations);
676 }
677 printExpr(init.clazz);
678 print("(");
679 printExprs(init.args);
680 print(")");
681 print(" */");
682 print(" /*enum*/ ");
683 if (init.args != null && init.args.nonEmpty()) {
684 print("(");
685 printExprs(init.args);
686 print(")");
687 }
688 if (init.def != null && init.def.defs != null) {
689 print(" ");
690 printBlock(init.def.defs);
691 }
692 return;
693 }
694 }
695 print(" /* = ");
696 printExpr(tree.init);
697 print(" */");
698 }
699 } else {
700 printExpr(tree.mods);
701 if ((tree.mods.flags & VARARGS) != 0) {
702 JCTree vartype = tree.vartype;
703 List<JCAnnotation> tas = null;
704 if (vartype instanceof JCAnnotatedType annotatedType) {
705 tas = annotatedType.annotations;
706 vartype = annotatedType.underlyingType;
707 }
708 printExpr(((JCArrayTypeTree) vartype).elemtype);
709 if (tas != null) {
710 print(' ');
711 printTypeAnnotations(tas);
712 }
713 print("... " + tree.name);
714 } else {
715 printExpr(tree.vartype);
716 print(" " + tree.name);
717 }
718 if (tree.init != null) {
719 print(" = ");
720 printExpr(tree.init);
721 }
722 if (prec == TreeInfo.notExpression) print(";");
723 }
724 } catch (IOException e) {
725 throw new UncheckedIOException(e);
726 }
727 }
728
729 public void visitSkip(JCSkip tree) {
730 try {
731 print(";");
732 } catch (IOException e) {
733 throw new UncheckedIOException(e);
734 }
735 }
736
737 public void visitBlock(JCBlock tree) {
738 try {
739 printFlags(tree.flags);
740 printBlock(tree.stats);
741 } catch (IOException e) {
742 throw new UncheckedIOException(e);
743 }
744 }
745
746 public void visitDoLoop(JCDoWhileLoop tree) {
747 try {
748 print("do ");
749 printStat(tree.body);
750 align();
751 print(" while ");
752 if (tree.cond.hasTag(PARENS)) {
753 printExpr(tree.cond);
754 } else {
755 print("(");
756 printExpr(tree.cond);
757 print(")");
758 }
759 print(";");
760 } catch (IOException e) {
761 throw new UncheckedIOException(e);
762 }
763 }
764
765 public void visitWhileLoop(JCWhileLoop tree) {
766 try {
767 print("while ");
768 if (tree.cond.hasTag(PARENS)) {
769 printExpr(tree.cond);
770 } else {
771 print("(");
772 printExpr(tree.cond);
773 print(")");
774 }
775 print(" ");
776 printStat(tree.body);
777 } catch (IOException e) {
778 throw new UncheckedIOException(e);
779 }
780 }
781
782 public void visitForLoop(JCForLoop tree) {
783 try {
784 print("for (");
785 if (tree.init.nonEmpty()) {
786 if (tree.init.head.hasTag(VARDEF)) {
787 printExpr(tree.init.head);
788 for (List<JCStatement> l = tree.init.tail; l.nonEmpty(); l = l.tail) {
789 JCVariableDecl vdef = (JCVariableDecl)l.head;
790 print(", " + vdef.name);
791 if (vdef.init != null) {
792 print(" = ");
793 printExpr(vdef.init);
794 }
795 }
796 } else {
797 printExprs(tree.init);
798 }
799 }
800 print("; ");
801 if (tree.cond != null) printExpr(tree.cond);
802 print("; ");
803 printExprs(tree.step);
804 print(") ");
805 printStat(tree.body);
806 } catch (IOException e) {
807 throw new UncheckedIOException(e);
808 }
809 }
810
811 public void visitForeachLoop(JCEnhancedForLoop tree) {
812 try {
813 print("for (");
814 printExpr(tree.var);
815 print(" : ");
816 printExpr(tree.expr);
817 print(") ");
818 printStat(tree.body);
819 } catch (IOException e) {
820 throw new UncheckedIOException(e);
821 }
822 }
823
824 public void visitLabelled(JCLabeledStatement tree) {
825 try {
826 print(tree.label + ": ");
827 printStat(tree.body);
828 } catch (IOException e) {
829 throw new UncheckedIOException(e);
830 }
831 }
832
833 public void visitSwitch(JCSwitch tree) {
834 try {
835 print("switch ");
836 if (tree.selector.hasTag(PARENS)) {
837 printExpr(tree.selector);
838 } else {
839 print("(");
840 printExpr(tree.selector);
841 print(")");
842 }
843 print(" {");
844 println();
845 printStats(tree.cases);
846 align();
847 print("}");
848 } catch (IOException e) {
849 throw new UncheckedIOException(e);
850 }
851 }
852
853 public void visitCase(JCCase tree) {
854 try {
855 if (tree.labels.size() == 1 && tree.labels.get(0).hasTag(DEFAULTCASELABEL)) {
856 print("default");
857 } else {
858 print("case ");
859 printExprs(tree.labels);
860 }
861 if (tree.caseKind == JCCase.STATEMENT) {
862 print(":");
863 println();
864 indent();
865 printStats(tree.stats);
866 undent();
867 align();
868 } else {
869 print(" -> ");
870 if (tree.stats.size() == 1) {
871 printStat(tree.stats.head);
872 } else {
873 printBlock(tree.stats);
874 }
875 }
876 } catch (IOException e) {
877 throw new UncheckedIOException(e);
878 }
879 }
880
881 @Override
882 public void visitDefaultCaseLabel(JCTree.JCDefaultCaseLabel that) {
883 try {
884 print("default");
885 } catch (IOException e) {
886 throw new UncheckedIOException(e);
887 }
888 }
889
890 public void visitSwitchExpression(JCSwitchExpression tree) {
891 try {
892 print("switch ");
893 if (tree.selector.hasTag(PARENS)) {
894 printExpr(tree.selector);
895 } else {
896 print("(");
897 printExpr(tree.selector);
898 print(")");
899 }
900 print(" {");
901 println();
902 printStats(tree.cases);
903 align();
904 print("}");
905 } catch (IOException e) {
906 throw new UncheckedIOException(e);
907 }
908 }
909
910 public void visitBindingPattern(JCBindingPattern patt) {
911 try {
912 printExpr(patt.var);
913 } catch (IOException e) {
914 throw new UncheckedIOException(e);
915 }
916 }
917
918 @Override
919 public void visitParenthesizedPattern(JCParenthesizedPattern patt) {
920 try {
921 print("(");
922 printExpr(patt.pattern);
923 print(")");
924 } catch (IOException e) {
925 throw new UncheckedIOException(e);
926 }
927 }
928
929 @Override
930 public void visitGuardPattern(JCGuardPattern patt) {
931 try {
932 printExpr(patt.patt);
933 print(" && ");
934 printExpr(patt.expr);
935 } catch (IOException e) {
936 throw new UncheckedIOException(e);
937 }
938 }
939
940 public void visitSynchronized(JCSynchronized tree) {
941 try {
942 print("synchronized ");
943 if (tree.lock.hasTag(PARENS)) {
944 printExpr(tree.lock);
945 } else {
946 print("(");
947 printExpr(tree.lock);
948 print(")");
949 }
950 print(" ");
951 printStat(tree.body);
952 } catch (IOException e) {
953 throw new UncheckedIOException(e);
954 }
955 }
956
957 public void visitTry(JCTry tree) {
958 try {
959 print("try ");
960 if (tree.resources.nonEmpty()) {
961 print("(");
962 boolean first = true;
963 for (JCTree var : tree.resources) {
964 if (!first) {
965 println();
966 indent();
967 }
968 printStat(var);
969 first = false;
970 }
971 print(") ");
972 }
973 printStat(tree.body);
974 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
975 printStat(l.head);
976 }
977 if (tree.finalizer != null) {
978 print(" finally ");
979 printStat(tree.finalizer);
980 }
981 } catch (IOException e) {
982 throw new UncheckedIOException(e);
983 }
984 }
985
986 public void visitCatch(JCCatch tree) {
987 try {
988 print(" catch (");
989 printExpr(tree.param);
990 print(") ");
991 printStat(tree.body);
992 } catch (IOException e) {
993 throw new UncheckedIOException(e);
994 }
995 }
996
997 public void visitConditional(JCConditional tree) {
998 try {
999 open(prec, TreeInfo.condPrec);
1000 printExpr(tree.cond, TreeInfo.condPrec + 1);
1001 print(" ? ");
1002 printExpr(tree.truepart);
1003 print(" : ");
1004 printExpr(tree.falsepart, TreeInfo.condPrec);
1005 close(prec, TreeInfo.condPrec);
1006 } catch (IOException e) {
1007 throw new UncheckedIOException(e);
1008 }
1009 }
1010
1011 public void visitIf(JCIf tree) {
1012 try {
1013 print("if ");
1014 if (tree.cond.hasTag(PARENS)) {
1015 printExpr(tree.cond);
1016 } else {
1017 print("(");
1018 printExpr(tree.cond);
1019 print(")");
1020 }
1021 print(" ");
1022 printStat(tree.thenpart);
1023 if (tree.elsepart != null) {
1024 print(" else ");
1025 printStat(tree.elsepart);
1026 }
1027 } catch (IOException e) {
1028 throw new UncheckedIOException(e);
1029 }
1030 }
1031
1032 public void visitExec(JCExpressionStatement tree) {
1033 try {
1034 printExpr(tree.expr);
1035 if (prec == TreeInfo.notExpression) print(";");
1036 } catch (IOException e) {
1037 throw new UncheckedIOException(e);
1038 }
1039 }
1040
1041 public void visitBreak(JCBreak tree) {
1042 try {
1043 print("break");
1044 if (tree.label != null) print(" " + tree.label);
1045 print(";");
1046 } catch (IOException e) {
1047 throw new UncheckedIOException(e);
1048 }
1049 }
1050
1051 public void visitYield(JCYield tree) {
1052 try {
1053 print("yield");
1054 print(" ");
1055 printExpr(tree.value);
1056 print(";");
1057 } catch (IOException e) {
1058 throw new UncheckedIOException(e);
1059 }
1060 }
1061
1062 public void visitContinue(JCContinue tree) {
1063 try {
1064 print("continue");
1065 if (tree.label != null) print(" " + tree.label);
1066 print(";");
1067 } catch (IOException e) {
1068 throw new UncheckedIOException(e);
1069 }
1070 }
1071
1072 public void visitReturn(JCReturn tree) {
1073 try {
1074 print("return");
1075 if (tree.expr != null) {
1076 print(" ");
1077 printExpr(tree.expr);
1078 }
1079 print(";");
1080 } catch (IOException e) {
1081 throw new UncheckedIOException(e);
1082 }
1083 }
1084
1085 public void visitThrow(JCThrow tree) {
1086 try {
1087 print("throw ");
1088 printExpr(tree.expr);
1089 print(";");
1090 } catch (IOException e) {
1091 throw new UncheckedIOException(e);
1092 }
1093 }
1094
1095 public void visitAssert(JCAssert tree) {
1096 try {
1097 print("assert ");
1098 printExpr(tree.cond);
1099 if (tree.detail != null) {
1100 print(" : ");
1101 printExpr(tree.detail);
1102 }
1103 print(";");
1104 } catch (IOException e) {
1105 throw new UncheckedIOException(e);
1106 }
1107 }
1108
1109 public void visitApply(JCMethodInvocation tree) {
1110 try {
1111 if (!tree.typeargs.isEmpty()) {
1112 if (tree.meth.hasTag(SELECT)) {
1113 JCFieldAccess left = (JCFieldAccess)tree.meth;
1114 printExpr(left.selected);
1115 print(".<");
1116 printExprs(tree.typeargs);
1117 print(">" + left.name);
1118 } else {
1119 print("<");
1120 printExprs(tree.typeargs);
1121 print(">");
1122 printExpr(tree.meth);
1123 }
1124 } else {
1125 printExpr(tree.meth);
1126 }
1127 print("(");
1128 printExprs(tree.args);
1129 print(")");
1130 } catch (IOException e) {
1131 throw new UncheckedIOException(e);
1132 }
1133 }
1134
1135 public void visitNewClass(JCNewClass tree) {
1136 try {
1137 if (tree.encl != null) {
1138 printExpr(tree.encl);
1139 print(".");
1140 }
1141 print("new ");
1142 if (!tree.typeargs.isEmpty()) {
1143 print("<");
1144 printExprs(tree.typeargs);
1145 print(">");
1146 }
1147 if (tree.def != null && tree.def.mods.annotations.nonEmpty()) {
1148 printTypeAnnotations(tree.def.mods.annotations);
1149 }
1150 printExpr(tree.clazz);
1151 print("(");
1152 printExprs(tree.args);
1153 print(")");
1154 if (tree.def != null) {
1155 Name enclClassNamePrev = enclClassName;
1156 enclClassName =
1157 tree.def.name != null ? tree.def.name :
1158 tree.type != null && tree.type.tsym.name != tree.type.tsym.name.table.names.empty
1159 ? tree.type.tsym.name : null;
1160 if ((tree.def.mods.flags & Flags.ENUM) != 0) print("/*enum*/");
1161 printBlock(tree.def.defs);
1162 enclClassName = enclClassNamePrev;
1163 }
1164 } catch (IOException e) {
1165 throw new UncheckedIOException(e);
1166 }
1167 }
1168
1169 public void visitNewArray(JCNewArray tree) {
1170 try {
1171 if (tree.elemtype != null) {
1172 print("new ");
1173 JCTree elem = tree.elemtype;
1174 printBaseElementType(elem);
1175
1176 if (!tree.annotations.isEmpty()) {
1177 print(' ');
1178 printTypeAnnotations(tree.annotations);
1179 }
1180 if (tree.elems != null) {
1181 print("[]");
1182 }
1183
1184 int i = 0;
1185 List<List<JCAnnotation>> da = tree.dimAnnotations;
1186 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1187 if (da.size() > i && !da.get(i).isEmpty()) {
1188 print(' ');
1189 printTypeAnnotations(da.get(i));
1190 }
1191 print("[");
1192 i++;
1193 printExpr(l.head);
1194 print("]");
1195 }
1196 printBrackets(elem);
1197 }
1198 if (tree.elems != null) {
1199 print("{");
1200 printExprs(tree.elems);
1201 print("}");
1202 }
1203 } catch (IOException e) {
1204 throw new UncheckedIOException(e);
1205 }
1206 }
1207
1208 public void visitLambda(JCLambda tree) {
1209 try {
1210 print("(");
1211 if (tree.paramKind == JCLambda.ParameterKind.EXPLICIT) {
1212 printExprs(tree.params);
1213 } else {
1214 String sep = "";
1215 for (JCVariableDecl param : tree.params) {
1216 print(sep);
1217 print(param.name);
1218 sep = ",";
1219 }
1220 }
1221 print(")->");
1222 printExpr(tree.body);
1223 } catch (IOException e) {
1224 throw new UncheckedIOException(e);
1225 }
1226 }
1227
1228 public void visitParens(JCParens tree) {
1229 try {
1230 print("(");
1231 printExpr(tree.expr);
1232 print(")");
1233 } catch (IOException e) {
1234 throw new UncheckedIOException(e);
1235 }
1236 }
1237
1238 public void visitAssign(JCAssign tree) {
1239 try {
1240 open(prec, TreeInfo.assignPrec);
1241 printExpr(tree.lhs, TreeInfo.assignPrec + 1);
1242 print(" = ");
1243 printExpr(tree.rhs, TreeInfo.assignPrec);
1244 close(prec, TreeInfo.assignPrec);
1245 } catch (IOException e) {
1246 throw new UncheckedIOException(e);
1247 }
1248 }
1249
1250 public String operatorName(JCTree.Tag tag) {
1251 switch(tag) {
1252 case POS: return "+";
1253 case NEG: return "-";
1254 case NOT: return "!";
1255 case COMPL: return "~";
1256 case PREINC: return "++";
1257 case PREDEC: return "--";
1258 case POSTINC: return "++";
1259 case POSTDEC: return "--";
1260 case NULLCHK: return "<*nullchk*>";
1261 case OR: return "||";
1262 case AND: return "&&";
1263 case EQ: return "==";
1264 case NE: return "!=";
1265 case LT: return "<";
1266 case GT: return ">";
1267 case LE: return "<=";
1268 case GE: return ">=";
1269 case BITOR: return "|";
1270 case BITXOR: return "^";
1271 case BITAND: return "&";
1272 case SL: return "<<";
1273 case SR: return ">>";
1274 case USR: return ">>>";
1275 case PLUS: return "+";
1276 case MINUS: return "-";
1277 case MUL: return "*";
1278 case DIV: return "/";
1279 case MOD: return "%";
1280 default: throw new Error();
1281 }
1282 }
1283
1284 public void visitAssignop(JCAssignOp tree) {
1285 try {
1286 open(prec, TreeInfo.assignopPrec);
1287 printExpr(tree.lhs, TreeInfo.assignopPrec + 1);
1288 print(" " + operatorName(tree.getTag().noAssignOp()) + "= ");
1289 printExpr(tree.rhs, TreeInfo.assignopPrec);
1290 close(prec, TreeInfo.assignopPrec);
1291 } catch (IOException e) {
1292 throw new UncheckedIOException(e);
1293 }
1294 }
1295
1296 public void visitUnary(JCUnary tree) {
1297 try {
1298 int ownprec = TreeInfo.opPrec(tree.getTag());
1299 String opname = operatorName(tree.getTag());
1300 open(prec, ownprec);
1301 if (!tree.getTag().isPostUnaryOp()) {
1302 print(opname);
1303 printExpr(tree.arg, ownprec);
1304 } else {
1305 printExpr(tree.arg, ownprec);
1306 print(opname);
1307 }
1308 close(prec, ownprec);
1309 } catch (IOException e) {
1310 throw new UncheckedIOException(e);
1311 }
1312 }
1313
1314 public void visitBinary(JCBinary tree) {
1315 try {
1316 int ownprec = TreeInfo.opPrec(tree.getTag());
1317 String opname = operatorName(tree.getTag());
1318 open(prec, ownprec);
1319 printExpr(tree.lhs, ownprec);
1320 print(" " + opname + " ");
1321 printExpr(tree.rhs, ownprec + 1);
1322 close(prec, ownprec);
1323 } catch (IOException e) {
1324 throw new UncheckedIOException(e);
1325 }
1326 }
1327
1328 public void visitTypeCast(JCTypeCast tree) {
1329 try {
1330 open(prec, TreeInfo.prefixPrec);
1331 print("(");
1332 printExpr(tree.clazz);
1333 print(")");
1334 printExpr(tree.expr, TreeInfo.prefixPrec);
1335 close(prec, TreeInfo.prefixPrec);
1336 } catch (IOException e) {
1337 throw new UncheckedIOException(e);
1338 }
1339 }
1340
1341 public void visitTypeTest(JCInstanceOf tree) {
1342 try {
1343 open(prec, TreeInfo.ordPrec);
1344 printExpr(tree.expr, TreeInfo.ordPrec);
1345 print(" instanceof ");
1346 if (tree.pattern instanceof JCPattern) {
1347 printPattern(tree.pattern);
1348 } else {
1349 printExpr(tree.getType(), TreeInfo.ordPrec + 1);
1350 }
1351 close(prec, TreeInfo.ordPrec);
1352 } catch (IOException e) {
1353 throw new UncheckedIOException(e);
1354 }
1355 }
1356
1357 public void visitIndexed(JCArrayAccess tree) {
1358 try {
1359 printExpr(tree.indexed, TreeInfo.postfixPrec);
1360 print("[");
1361 printExpr(tree.index);
1362 print("]");
1363 } catch (IOException e) {
1364 throw new UncheckedIOException(e);
1365 }
1366 }
1367
1368 public void visitSelect(JCFieldAccess tree) {
1369 try {
1370 printExpr(tree.selected, TreeInfo.postfixPrec);
1371 print("." + tree.name);
1372 } catch (IOException e) {
1373 throw new UncheckedIOException(e);
1374 }
1375 }
1376
1377 public void visitReference(JCMemberReference tree) {
1378 try {
1379 printExpr(tree.expr);
1380 print("::");
1381 if (tree.typeargs != null) {
1382 print("<");
1383 printExprs(tree.typeargs);
1384 print(">");
1385 }
1386 print(tree.getMode() == ReferenceMode.INVOKE ? tree.name : "new");
1387 } catch (IOException e) {
1388 throw new UncheckedIOException(e);
1389 }
1390 }
1391
1392 public void visitIdent(JCIdent tree) {
1393 try {
1394 print(tree.name);
1395 } catch (IOException e) {
1396 throw new UncheckedIOException(e);
1397 }
1398 }
1399
1400 public void visitLiteral(JCLiteral tree) {
1401 try {
1402 switch (tree.typetag) {
1403 case INT:
1404 print(tree.value.toString());
1405 break;
1406 case LONG:
1407 print(tree.value + "L");
1408 break;
1409 case FLOAT:
1410 print(tree.value + "F");
1411 break;
1412 case DOUBLE:
1413 print(tree.value.toString());
1414 break;
1415 case CHAR:
1416 print("\'" +
1417 Convert.quote(
1418 String.valueOf((char)((Number)tree.value).intValue())) +
1419 "\'");
1420 break;
1421 case BOOLEAN:
1422 print(((Number)tree.value).intValue() == 1 ? "true" : "false");
1423 break;
1424 case BOT:
1425 print("null");
1426 break;
1427 default:
1428 print("\"" + Convert.quote(tree.value.toString()) + "\"");
1429 break;
1430 }
1431 } catch (IOException e) {
1432 throw new UncheckedIOException(e);
1433 }
1434 }
1435
1436 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
1437 try {
1438 switch(tree.typetag) {
1439 case BYTE:
1440 print("byte");
1441 break;
1442 case CHAR:
1443 print("char");
1444 break;
1445 case SHORT:
1446 print("short");
1447 break;
1448 case INT:
1449 print("int");
1450 break;
1451 case LONG:
1452 print("long");
1453 break;
1454 case FLOAT:
1455 print("float");
1456 break;
1457 case DOUBLE:
1458 print("double");
1459 break;
1460 case BOOLEAN:
1461 print("boolean");
1462 break;
1463 case VOID:
1464 print("void");
1465 break;
1466 default:
1467 print("error");
1468 break;
1469 }
1470 } catch (IOException e) {
1471 throw new UncheckedIOException(e);
1472 }
1473 }
1474
1475 public void visitTypeArray(JCArrayTypeTree tree) {
1476 try {
1477 printBaseElementType(tree);
1478 printBrackets(tree);
1479 } catch (IOException e) {
1480 throw new UncheckedIOException(e);
1481 }
1482 }
1483
1484 // Prints the inner element type of a nested array
1485 private void printBaseElementType(JCTree tree) throws IOException {
1486 printExpr(TreeInfo.innermostType(tree, false));
1487 }
1488
1489 // prints the brackets of a nested array in reverse order
1490 // tree is either JCArrayTypeTree or JCAnnotatedTypeTree
1491 private void printBrackets(JCTree tree) throws IOException {
1492 JCTree elem = tree;
1493 while (true) {
1494 if (elem.hasTag(ANNOTATED_TYPE)) {
1495 JCAnnotatedType atype = (JCAnnotatedType) elem;
1496 elem = atype.underlyingType;
1497 if (elem.hasTag(TYPEARRAY)) {
1498 print(' ');
1499 printTypeAnnotations(atype.annotations);
1500 }
1501 }
1502 if (elem.hasTag(TYPEARRAY)) {
1503 print("[]");
1504 elem = ((JCArrayTypeTree)elem).elemtype;
1505 } else {
1506 break;
1507 }
1508 }
1509 }
1510
1511 public void visitTypeApply(JCTypeApply tree) {
1512 try {
1513 printExpr(tree.clazz);
1514 print("<");
1515 printExprs(tree.arguments);
1516 print(">");
1517 } catch (IOException e) {
1518 throw new UncheckedIOException(e);
1519 }
1520 }
1521
1522 public void visitTypeUnion(JCTypeUnion tree) {
1523 try {
1524 printExprs(tree.alternatives, " | ");
1525 } catch (IOException e) {
1526 throw new UncheckedIOException(e);
1527 }
1528 }
1529
1530 public void visitTypeIntersection(JCTypeIntersection tree) {
1531 try {
1532 printExprs(tree.bounds, " & ");
1533 } catch (IOException e) {
1534 throw new UncheckedIOException(e);
1535 }
1536 }
1537
1538 public void visitTypeParameter(JCTypeParameter tree) {
1539 try {
1540 if (tree.annotations.nonEmpty()) {
1541 this.printTypeAnnotations(tree.annotations);
1542 }
1543 print(tree.name);
1544 if (tree.bounds.nonEmpty()) {
1545 print(" extends ");
1546 printExprs(tree.bounds, " & ");
1547 }
1548 } catch (IOException e) {
1549 throw new UncheckedIOException(e);
1550 }
1551 }
1552
1553 @Override
1554 public void visitWildcard(JCWildcard tree) {
1555 try {
1556 print(tree.kind);
1557 if (tree.kind.kind != BoundKind.UNBOUND)
1558 printExpr(tree.inner);
1559 } catch (IOException e) {
1560 throw new UncheckedIOException(e);
1561 }
1562 }
1563
1564 @Override
1565 public void visitTypeBoundKind(TypeBoundKind tree) {
1566 try {
1567 print(String.valueOf(tree.kind));
1568 } catch (IOException e) {
1569 throw new UncheckedIOException(e);
1570 }
1571 }
1572
1573 public void visitErroneous(JCErroneous tree) {
1574 try {
1575 print("(ERROR)");
1576 } catch (IOException e) {
1577 throw new UncheckedIOException(e);
1578 }
1579 }
1580
1581 public void visitLetExpr(LetExpr tree) {
1582 try {
1583 print("(let " + tree.defs + " in " + tree.expr + ")");
1584 } catch (IOException e) {
1585 throw new UncheckedIOException(e);
1586 }
1587 }
1588
1589 public void visitModifiers(JCModifiers mods) {
1590 try {
1591 printAnnotations(mods.annotations);
1592 printFlags(mods.flags);
1593 } catch (IOException e) {
1594 throw new UncheckedIOException(e);
1595 }
1596 }
1597
1598 public void visitAnnotation(JCAnnotation tree) {
1599 try {
1600 print("@");
1601 printExpr(tree.annotationType);
1602 if (!tree.args.isEmpty()) {
1603 print("(");
1604 printExprs(tree.args);
1605 print(")");
1606 }
1607 } catch (IOException e) {
1608 throw new UncheckedIOException(e);
1609 }
1610 }
1611
1612 public void visitAnnotatedType(JCAnnotatedType tree) {
1613 try {
1614 if (tree.underlyingType.hasTag(SELECT)) {
1615 JCFieldAccess access = (JCFieldAccess) tree.underlyingType;
1616 printExpr(access.selected, TreeInfo.postfixPrec);
1617 print(".");
1618 printTypeAnnotations(tree.annotations);
1619 print(access.name);
1620 } else if (tree.underlyingType.hasTag(TYPEARRAY)) {
1621 printBaseElementType(tree);
1622 printBrackets(tree);
1623 } else {
1624 printTypeAnnotations(tree.annotations);
1625 printExpr(tree.underlyingType);
1626 }
1627 } catch (IOException e) {
1628 throw new UncheckedIOException(e);
1629 }
1630 }
1631
1632 public void visitTree(JCTree tree) {
1633 try {
1634 print("(UNKNOWN: " + tree.getTag() + ")");
1635 println();
1636 } catch (IOException e) {
1637 throw new UncheckedIOException(e);
1638 }
1639 }
1640
1641 }