1 /*
2 * Copyright (c) 1999, 2022, 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 /** Visitor argument: the current precedence level.
174 */
175 int prec;
176
177 /** Visitor method: print expression tree.
178 * @param prec The current precedence level.
179 */
180 public void printExpr(JCTree tree, int prec) throws IOException {
181 int prevPrec = this.prec;
182 try {
183 this.prec = prec;
184 if (tree == null) print("/*missing*/");
185 else {
186 tree.accept(this);
187 }
188 } catch (UncheckedIOException ex) {
189 throw ex.getCause();
190 } finally {
191 this.prec = prevPrec;
192 }
193 }
194
195 /** Derived visitor method: print expression tree at minimum precedence level
196 * for expression.
197 */
198 public void printExpr(JCTree tree) throws IOException {
199 printExpr(tree, TreeInfo.noPrec);
200 }
201
202 /** Derived visitor method: print statement tree.
203 */
204 public void printStat(JCTree tree) throws IOException {
205 printExpr(tree, TreeInfo.notExpression);
206 }
207
208 /** Derived visitor method: print list of expression trees, separated by given string.
209 * @param sep the separator string
210 */
211 public <T extends JCTree> void printExprs(List<T> trees, String sep) throws IOException {
212 if (trees.nonEmpty()) {
213 printExpr(trees.head);
214 for (List<T> l = trees.tail; l.nonEmpty(); l = l.tail) {
215 print(sep);
216 printExpr(l.head);
217 }
218 }
219 }
220
221 /** Derived visitor method: print list of expression trees, separated by commas.
222 */
223 public <T extends JCTree> void printExprs(List<T> trees) throws IOException {
224 printExprs(trees, ", ");
225 }
226
227
228 /** Derived visitor method: print pattern.
229 */
230
231 public void printPattern(JCTree tree) throws IOException {
232 printExpr(tree);
233 }
234
235 /** Derived visitor method: print list of statements, each on a separate line.
236 */
237 public void printStats(List<? extends JCTree> trees) throws IOException {
238 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail) {
239 align();
240 printStat(l.head);
241 println();
242 }
243 }
244
245 /** Print a set of modifiers.
246 */
247 public void printFlags(long flags) throws IOException {
248 if ((flags & SYNTHETIC) != 0) print("/*synthetic*/ ");
249 print(TreeInfo.flagNames(flags));
250 if ((flags & ExtendedStandardFlags) != 0) print(" ");
251 if ((flags & ANNOTATION) != 0) print("@");
252 }
253
254 public void printAnnotations(List<JCAnnotation> trees) throws IOException {
255 for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail) {
256 printStat(l.head);
257 println();
258 align();
259 }
260 }
261
262 public void printTypeAnnotations(List<JCAnnotation> trees) throws IOException {
263 for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail) {
264 printExpr(l.head);
265 print(" ");
266 }
267 }
268
269 /** Print documentation comment, if it exists
270 * @param tree The tree for which a documentation comment should be printed.
271 */
272 public void printDocComment(JCTree tree) throws IOException {
273 if (docComments != null) {
274 String dc = docComments.getCommentText(tree);
275 if (dc != null) {
276 print("/**"); println();
277 int pos = 0;
278 int endpos = lineEndPos(dc, pos);
279 while (pos < dc.length()) {
280 align();
281 print(" *");
282 if (pos < dc.length() && dc.charAt(pos) > ' ') print(" ");
283 print(dc.substring(pos, endpos)); println();
284 pos = endpos + 1;
285 endpos = lineEndPos(dc, pos);
286 }
287 align(); print(" */"); println();
288 align();
289 }
290 }
291 }
292 //where
293 static int lineEndPos(String s, int start) {
294 int pos = s.indexOf('\n', start);
295 if (pos < 0) pos = s.length();
296 return pos;
297 }
298
299 /** If type parameter list is non-empty, print it enclosed in
300 * {@literal "<...>"} brackets.
301 */
302 public void printTypeParameters(List<JCTypeParameter> trees) throws IOException {
303 if (trees.nonEmpty()) {
304 print("<");
305 printExprs(trees);
306 print(">");
307 }
308 }
309
310 /** Print a block.
311 */
312 public void printBlock(List<? extends JCTree> stats) throws IOException {
313 print("{");
314 println();
315 indent();
316 printStats(stats);
317 undent();
318 align();
319 print("}");
320 }
321
322 /** Print a block.
323 */
324 public void printEnumBody(List<JCTree> stats) throws IOException {
325 print("{");
326 println();
327 indent();
328 boolean first = true;
329 for (List<JCTree> l = stats; l.nonEmpty(); l = l.tail) {
330 if (isEnumerator(l.head)) {
331 if (!first) {
332 print(",");
333 println();
334 }
335 align();
336 printStat(l.head);
337 first = false;
338 }
339 }
340 print(";");
341 println();
342 for (List<JCTree> l = stats; l.nonEmpty(); l = l.tail) {
343 if (!isEnumerator(l.head)) {
344 align();
345 printStat(l.head);
346 println();
347 }
348 }
349 undent();
350 align();
351 print("}");
352 }
353
354 /** Is the given tree an enumerator definition? */
355 boolean isEnumerator(JCTree t) {
356 return t.hasTag(VARDEF) && (((JCVariableDecl) t).mods.flags & ENUM) != 0;
357 }
358
359 /** Print unit consisting of package clause and import statements in toplevel,
360 * followed by class definition. if class definition == null,
361 * print all definitions in toplevel.
362 * @param tree The toplevel tree
363 * @param cdef The class definition, which is assumed to be part of the
364 * toplevel tree.
365 */
366 public void printUnit(JCCompilationUnit tree, JCClassDecl cdef) throws IOException {
367 docComments = tree.docComments;
368 printDocComment(tree);
369
370 boolean firstImport = true;
371 for (List<JCTree> l = tree.defs;
372 l.nonEmpty() &&
373 (cdef == null ||
374 l.head.hasTag(IMPORT) || l.head.hasTag(PACKAGEDEF));
375 l = l.tail) {
376 if (l.head.hasTag(IMPORT)) {
377 JCImport imp = (JCImport)l.head;
378 Name name = TreeInfo.name(imp.qualid);
379 if (name == name.table.names.asterisk ||
380 cdef == null ||
381 isUsed(TreeInfo.symbol(imp.qualid), cdef)) {
382 if (firstImport) {
383 firstImport = false;
384 println();
385 }
386 printStat(imp);
387 }
388 } else {
389 printStat(l.head);
390 }
391 }
392 if (cdef != null) {
393 printStat(cdef);
394 println();
395 }
396 }
397 // where
398 boolean isUsed(final Symbol t, JCTree cdef) {
399 class UsedVisitor extends TreeScanner {
400 public void scan(JCTree tree) {
401 if (tree!=null && !result) tree.accept(this);
402 }
403 boolean result = false;
404 public void visitIdent(JCIdent tree) {
405 if (tree.sym == t) result = true;
406 }
407 }
408 UsedVisitor v = new UsedVisitor();
409 v.scan(cdef);
410 return v.result;
411 }
412
413 /**************************************************************************
414 * Visitor methods
415 *************************************************************************/
416
417 public void visitTopLevel(JCCompilationUnit tree) {
418 try {
419 printUnit(tree, null);
420 } catch (IOException e) {
421 throw new UncheckedIOException(e);
422 }
423 }
424
425 public void visitPackageDef(JCPackageDecl tree) {
426 try {
427 printDocComment(tree);
428 printAnnotations(tree.annotations);
429 if (tree.pid != null) {
430 print("package ");
431 printExpr(tree.pid);
432 print(";");
433 println();
434 }
435 } catch (IOException e) {
436 throw new UncheckedIOException(e);
437 }
438 }
439
440 @Override
441 public void visitModuleDef(JCModuleDecl tree) {
442 try {
443 printDocComment(tree);
444 printAnnotations(tree.mods.annotations);
445 if (tree.getModuleType() == ModuleKind.OPEN) {
446 print("open ");
447 }
448 print("module ");
449 printExpr(tree.qualId);
450 if (tree.directives == null) {
451 print(";");
452 } else {
453 print(" ");
454 printBlock(tree.directives);
455 }
456 println();
457 } catch (IOException e) {
458 throw new UncheckedIOException(e);
459 }
460 }
461
462 @Override
463 public void visitExports(JCExports tree) {
464 try {
465 print("exports ");
466 printExpr(tree.qualid);
467 if (tree.moduleNames != null) {
468 print(" to ");
469 printExprs(tree.moduleNames);
470 }
471 print(";");
472 } catch (IOException e) {
473 throw new UncheckedIOException(e);
474 }
475 }
476
477 @Override
478 public void visitOpens(JCOpens tree) {
479 try {
480 print("opens ");
481 printExpr(tree.qualid);
482 if (tree.moduleNames != null) {
483 print(" to ");
484 printExprs(tree.moduleNames);
485 }
486 print(";");
487 } catch (IOException e) {
488 throw new UncheckedIOException(e);
489 }
490 }
491
492 @Override
493 public void visitProvides(JCProvides tree) {
494 try {
495 print("provides ");
496 printExpr(tree.serviceName);
497 print(" with ");
498 printExprs(tree.implNames);
499 print(";");
500 } catch (IOException e) {
501 throw new UncheckedIOException(e);
502 }
503 }
504
505 @Override
506 public void visitRequires(JCRequires tree) {
507 try {
508 print("requires ");
509 if (tree.isStaticPhase)
510 print("static ");
511 if (tree.isTransitive)
512 print("transitive ");
513 printExpr(tree.moduleName);
514 print(";");
515 } catch (IOException e) {
516 throw new UncheckedIOException(e);
517 }
518 }
519
520 @Override
521 public void visitUses(JCUses tree) {
522 try {
523 print("uses ");
524 printExpr(tree.qualid);
525 print(";");
526 } catch (IOException e) {
527 throw new UncheckedIOException(e);
528 }
529 }
530
531 public void visitImport(JCImport tree) {
532 try {
533 print("import ");
534 if (tree.staticImport) print("static ");
535 printExpr(tree.qualid);
536 print(";");
537 println();
538 } catch (IOException e) {
539 throw new UncheckedIOException(e);
540 }
541 }
542
543 public void visitClassDef(JCClassDecl tree) {
544 try {
545 println(); align();
546 printDocComment(tree);
547 printAnnotations(tree.mods.annotations);
548 printFlags(tree.mods.flags & ~INTERFACE);
549 Name enclClassNamePrev = enclClassName;
550 enclClassName = tree.name;
551 if ((tree.mods.flags & INTERFACE) != 0) {
552 print("interface " + tree.name);
553 printTypeParameters(tree.typarams);
554 if (tree.implementing.nonEmpty()) {
555 print(" extends ");
556 printExprs(tree.implementing);
557 }
558 if (tree.permitting.nonEmpty()) {
559 print(" permits ");
560 printExprs(tree.permitting);
561 }
562 } else {
563 if ((tree.mods.flags & ENUM) != 0)
564 print("enum " + tree.name);
565 else
566 print("class " + tree.name);
567 printTypeParameters(tree.typarams);
568 if (tree.extending != null) {
569 print(" extends ");
570 printExpr(tree.extending);
571 }
572 if (tree.implementing.nonEmpty()) {
573 print(" implements ");
574 printExprs(tree.implementing);
575 }
576 if (tree.permitting.nonEmpty()) {
577 print(" permits ");
578 printExprs(tree.permitting);
579 }
580 }
581 print(" ");
582 if ((tree.mods.flags & ENUM) != 0) {
583 printEnumBody(tree.defs);
584 } else {
585 printBlock(tree.defs);
586 }
587 enclClassName = enclClassNamePrev;
588 } catch (IOException e) {
589 throw new UncheckedIOException(e);
590 }
591 }
592
593 public void visitMethodDef(JCMethodDecl tree) {
594 try {
595 // when producing source output, omit anonymous constructors
596 if (tree.name == tree.name.table.names.init &&
597 enclClassName == null &&
598 sourceOutput) return;
599 println(); align();
600 printDocComment(tree);
601 printExpr(tree.mods);
602 printTypeParameters(tree.typarams);
603 if (tree.name == tree.name.table.names.init) {
604 print(enclClassName != null ? enclClassName : tree.name);
605 } else {
606 printExpr(tree.restype);
607 print(" " + tree.name);
608 }
609 print("(");
610 if (tree.recvparam!=null) {
611 printExpr(tree.recvparam);
612 if (tree.params.size() > 0) {
613 print(", ");
614 }
615 }
616 printExprs(tree.params);
617 print(")");
618 if (tree.thrown.nonEmpty()) {
619 print(" throws ");
620 printExprs(tree.thrown);
621 }
622 if (tree.defaultValue != null) {
623 print(" default ");
624 printExpr(tree.defaultValue);
625 }
626 if (tree.body != null) {
627 print(" ");
628 printStat(tree.body);
629 } else {
630 print(";");
631 }
632 } catch (IOException e) {
633 throw new UncheckedIOException(e);
634 }
635 }
636
637 public void visitVarDef(JCVariableDecl tree) {
638 try {
639 if (docComments != null && docComments.hasComment(tree)) {
640 println(); align();
641 }
642 printDocComment(tree);
643 if ((tree.mods.flags & ENUM) != 0) {
644 print("/*public static final*/ ");
645 print(tree.name);
646 if (tree.init != null) {
647 if (tree.init.hasTag(NEWCLASS)) {
648 JCNewClass init = (JCNewClass) tree.init;
649 if (sourceOutput) {
650 print(" /*enum*/ ");
651 if (init.args != null && init.args.nonEmpty()) {
652 print("(");
653 print(init.args);
654 print(")");
655 }
656 if (init.def != null && init.def.defs != null) {
657 print(" ");
658 printBlock(init.def.defs);
659 }
660 return;
661 }else {
662 print(" /* = ");
663 print("new ");
664 if (init.def != null && init.def.mods.annotations.nonEmpty()) {
665 printTypeAnnotations(init.def.mods.annotations);
666 }
667 printExpr(init.clazz);
668 print("(");
669 printExprs(init.args);
670 print(")");
671 print(" */");
672 print(" /*enum*/ ");
673 if (init.args != null && init.args.nonEmpty()) {
674 print("(");
675 printExprs(init.args);
676 print(")");
677 }
678 if (init.def != null && init.def.defs != null) {
679 print(" ");
680 printBlock(init.def.defs);
681 }
682 return;
683 }
684 }
685 print(" /* = ");
686 printExpr(tree.init);
687 print(" */");
688 }
689 } else {
690 printExpr(tree.mods);
691 if ((tree.mods.flags & VARARGS) != 0) {
692 JCTree vartype = tree.vartype;
693 List<JCAnnotation> tas = null;
694 if (vartype instanceof JCAnnotatedType annotatedType) {
695 tas = annotatedType.annotations;
696 vartype = annotatedType.underlyingType;
697 }
698 printExpr(((JCArrayTypeTree) vartype).elemtype);
699 if (tas != null) {
700 print(' ');
701 printTypeAnnotations(tas);
702 }
703 print("... " + tree.name);
704 } else {
705 printExpr(tree.vartype);
706 print(" " + tree.name);
707 }
708 if (tree.init != null) {
709 print(" = ");
710 printExpr(tree.init);
711 }
712 if (prec == TreeInfo.notExpression) print(";");
713 }
714 } catch (IOException e) {
715 throw new UncheckedIOException(e);
716 }
717 }
718
719 public void visitSkip(JCSkip tree) {
720 try {
721 print(";");
722 } catch (IOException e) {
723 throw new UncheckedIOException(e);
724 }
725 }
726
727 public void visitBlock(JCBlock tree) {
728 try {
729 printFlags(tree.flags);
730 printBlock(tree.stats);
731 } catch (IOException e) {
732 throw new UncheckedIOException(e);
733 }
734 }
735
736 public void visitDoLoop(JCDoWhileLoop tree) {
737 try {
738 print("do ");
739 printStat(tree.body);
740 align();
741 print(" while ");
742 if (tree.cond.hasTag(PARENS)) {
743 printExpr(tree.cond);
744 } else {
745 print("(");
746 printExpr(tree.cond);
747 print(")");
748 }
749 print(";");
750 } catch (IOException e) {
751 throw new UncheckedIOException(e);
752 }
753 }
754
755 public void visitWhileLoop(JCWhileLoop tree) {
756 try {
757 print("while ");
758 if (tree.cond.hasTag(PARENS)) {
759 printExpr(tree.cond);
760 } else {
761 print("(");
762 printExpr(tree.cond);
763 print(")");
764 }
765 print(" ");
766 printStat(tree.body);
767 } catch (IOException e) {
768 throw new UncheckedIOException(e);
769 }
770 }
771
772 public void visitForLoop(JCForLoop tree) {
773 try {
774 print("for (");
775 if (tree.init.nonEmpty()) {
776 if (tree.init.head.hasTag(VARDEF)) {
777 printExpr(tree.init.head);
778 for (List<JCStatement> l = tree.init.tail; l.nonEmpty(); l = l.tail) {
779 JCVariableDecl vdef = (JCVariableDecl)l.head;
780 print(", " + vdef.name);
781 if (vdef.init != null) {
782 print(" = ");
783 printExpr(vdef.init);
784 }
785 }
786 } else {
787 printExprs(tree.init);
788 }
789 }
790 print("; ");
791 if (tree.cond != null) printExpr(tree.cond);
792 print("; ");
793 printExprs(tree.step);
794 print(") ");
795 printStat(tree.body);
796 } catch (IOException e) {
797 throw new UncheckedIOException(e);
798 }
799 }
800
801 public void visitForeachLoop(JCEnhancedForLoop tree) {
802 try {
803 print("for (");
804 printExpr(tree.varOrRecordPattern);
805 print(" : ");
806 printExpr(tree.expr);
807 print(") ");
808 printStat(tree.body);
809 } catch (IOException e) {
810 throw new UncheckedIOException(e);
811 }
812 }
813
814 public void visitLabelled(JCLabeledStatement tree) {
815 try {
816 print(tree.label + ": ");
817 printStat(tree.body);
818 } catch (IOException e) {
819 throw new UncheckedIOException(e);
820 }
821 }
822
823 public void visitSwitch(JCSwitch tree) {
824 try {
825 print("switch ");
826 if (tree.selector.hasTag(PARENS)) {
827 printExpr(tree.selector);
828 } else {
829 print("(");
830 printExpr(tree.selector);
831 print(")");
832 }
833 print(" {");
834 println();
835 printStats(tree.cases);
836 align();
837 print("}");
838 } catch (IOException e) {
839 throw new UncheckedIOException(e);
840 }
841 }
842
843 public void visitCase(JCCase tree) {
844 try {
845 if (tree.labels.size() == 1 && tree.labels.get(0).hasTag(DEFAULTCASELABEL)) {
846 print("default");
847 } else {
848 print("case ");
849 printExprs(tree.labels);
850 }
851 if (tree.caseKind == JCCase.STATEMENT) {
852 print(":");
853 println();
854 indent();
855 printStats(tree.stats);
856 undent();
857 align();
858 } else {
859 print(" -> ");
860 if (tree.stats.size() == 1) {
861 printStat(tree.stats.head);
862 } else {
863 printBlock(tree.stats);
864 }
865 }
866 } catch (IOException e) {
867 throw new UncheckedIOException(e);
868 }
869 }
870
871 @Override
872 public void visitDefaultCaseLabel(JCTree.JCDefaultCaseLabel that) {
873 try {
874 print("default");
875 } catch (IOException e) {
876 throw new UncheckedIOException(e);
877 }
878 }
879
880 @Override
881 public void visitConstantCaseLabel(JCConstantCaseLabel tree) {
882 try {
883 print(tree.expr);
884 } catch (IOException e) {
885 throw new UncheckedIOException(e);
886 }
887 }
888
889 @Override
890 public void visitPatternCaseLabel(JCPatternCaseLabel tree) {
891 try {
892 print(tree.pat);
893 if (tree.guard != null) {
894 print(" when ");
895 print(tree.guard);
896 }
897 } catch (IOException e) {
898 throw new UncheckedIOException(e);
899 }
900 }
901
902 public void visitSwitchExpression(JCSwitchExpression tree) {
903 try {
904 print("switch ");
905 if (tree.selector.hasTag(PARENS)) {
906 printExpr(tree.selector);
907 } else {
908 print("(");
909 printExpr(tree.selector);
910 print(")");
911 }
912 print(" {");
913 println();
914 printStats(tree.cases);
915 align();
916 print("}");
917 } catch (IOException e) {
918 throw new UncheckedIOException(e);
919 }
920 }
921
922 public void visitBindingPattern(JCBindingPattern patt) {
923 try {
924 printExpr(patt.var);
925 } catch (IOException e) {
926 throw new UncheckedIOException(e);
927 }
928 }
929
930 @Override
931 public void visitParenthesizedPattern(JCParenthesizedPattern patt) {
932 try {
933 print("(");
934 printExpr(patt.pattern);
935 print(")");
936 } catch (IOException e) {
937 throw new UncheckedIOException(e);
938 }
939 }
940
941 @Override
942 public void visitRecordPattern(JCRecordPattern tree) {
943 try {
944 printExpr(tree.deconstructor);
945 print("(");
946 printExprs(tree.nested);
947 print(")");
948 } catch (IOException e) {
949 throw new UncheckedIOException(e);
950 }
951 }
952
953 public void visitSynchronized(JCSynchronized tree) {
954 try {
955 print("synchronized ");
956 if (tree.lock.hasTag(PARENS)) {
957 printExpr(tree.lock);
958 } else {
959 print("(");
960 printExpr(tree.lock);
961 print(")");
962 }
963 print(" ");
964 printStat(tree.body);
965 } catch (IOException e) {
966 throw new UncheckedIOException(e);
967 }
968 }
969
970 public void visitTry(JCTry tree) {
971 try {
972 print("try ");
973 if (tree.resources.nonEmpty()) {
974 print("(");
975 boolean first = true;
976 for (JCTree var : tree.resources) {
977 if (!first) {
978 println();
979 indent();
980 }
981 printStat(var);
982 first = false;
983 }
984 print(") ");
985 }
986 printStat(tree.body);
987 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
988 printStat(l.head);
989 }
990 if (tree.finalizer != null) {
991 print(" finally ");
992 printStat(tree.finalizer);
993 }
994 } catch (IOException e) {
995 throw new UncheckedIOException(e);
996 }
997 }
998
999 public void visitCatch(JCCatch tree) {
1000 try {
1001 print(" catch (");
1002 printExpr(tree.param);
1003 print(") ");
1004 printStat(tree.body);
1005 } catch (IOException e) {
1006 throw new UncheckedIOException(e);
1007 }
1008 }
1009
1010 public void visitConditional(JCConditional tree) {
1011 try {
1012 open(prec, TreeInfo.condPrec);
1013 printExpr(tree.cond, TreeInfo.condPrec + 1);
1014 print(" ? ");
1015 printExpr(tree.truepart);
1016 print(" : ");
1017 printExpr(tree.falsepart, TreeInfo.condPrec);
1018 close(prec, TreeInfo.condPrec);
1019 } catch (IOException e) {
1020 throw new UncheckedIOException(e);
1021 }
1022 }
1023
1024 public void visitIf(JCIf tree) {
1025 try {
1026 print("if ");
1027 if (tree.cond.hasTag(PARENS)) {
1028 printExpr(tree.cond);
1029 } else {
1030 print("(");
1031 printExpr(tree.cond);
1032 print(")");
1033 }
1034 print(" ");
1035 printStat(tree.thenpart);
1036 if (tree.elsepart != null) {
1037 print(" else ");
1038 printStat(tree.elsepart);
1039 }
1040 } catch (IOException e) {
1041 throw new UncheckedIOException(e);
1042 }
1043 }
1044
1045 public void visitExec(JCExpressionStatement tree) {
1046 try {
1047 printExpr(tree.expr);
1048 if (prec == TreeInfo.notExpression) print(";");
1049 } catch (IOException e) {
1050 throw new UncheckedIOException(e);
1051 }
1052 }
1053
1054 public void visitBreak(JCBreak tree) {
1055 try {
1056 print("break");
1057 if (tree.label != null) print(" " + tree.label);
1058 print(";");
1059 } catch (IOException e) {
1060 throw new UncheckedIOException(e);
1061 }
1062 }
1063
1064 public void visitYield(JCYield tree) {
1065 try {
1066 print("yield");
1067 print(" ");
1068 printExpr(tree.value);
1069 print(";");
1070 } catch (IOException e) {
1071 throw new UncheckedIOException(e);
1072 }
1073 }
1074
1075 public void visitContinue(JCContinue tree) {
1076 try {
1077 print("continue");
1078 if (tree.label != null) print(" " + tree.label);
1079 print(";");
1080 } catch (IOException e) {
1081 throw new UncheckedIOException(e);
1082 }
1083 }
1084
1085 public void visitReturn(JCReturn tree) {
1086 try {
1087 print("return");
1088 if (tree.expr != null) {
1089 print(" ");
1090 printExpr(tree.expr);
1091 }
1092 print(";");
1093 } catch (IOException e) {
1094 throw new UncheckedIOException(e);
1095 }
1096 }
1097
1098 public void visitThrow(JCThrow tree) {
1099 try {
1100 print("throw ");
1101 printExpr(tree.expr);
1102 print(";");
1103 } catch (IOException e) {
1104 throw new UncheckedIOException(e);
1105 }
1106 }
1107
1108 public void visitAssert(JCAssert tree) {
1109 try {
1110 print("assert ");
1111 printExpr(tree.cond);
1112 if (tree.detail != null) {
1113 print(" : ");
1114 printExpr(tree.detail);
1115 }
1116 print(";");
1117 } catch (IOException e) {
1118 throw new UncheckedIOException(e);
1119 }
1120 }
1121
1122 public void visitApply(JCMethodInvocation tree) {
1123 try {
1124 if (!tree.typeargs.isEmpty()) {
1125 if (tree.meth.hasTag(SELECT)) {
1126 JCFieldAccess left = (JCFieldAccess)tree.meth;
1127 printExpr(left.selected);
1128 print(".<");
1129 printExprs(tree.typeargs);
1130 print(">" + left.name);
1131 } else {
1132 print("<");
1133 printExprs(tree.typeargs);
1134 print(">");
1135 printExpr(tree.meth);
1136 }
1137 } else {
1138 printExpr(tree.meth);
1139 }
1140 print("(");
1141 printExprs(tree.args);
1142 print(")");
1143 } catch (IOException e) {
1144 throw new UncheckedIOException(e);
1145 }
1146 }
1147
1148 public void visitNewClass(JCNewClass tree) {
1149 try {
1150 if (tree.encl != null) {
1151 printExpr(tree.encl);
1152 print(".");
1153 }
1154 print("new ");
1155 if (!tree.typeargs.isEmpty()) {
1156 print("<");
1157 printExprs(tree.typeargs);
1158 print(">");
1159 }
1160 if (tree.def != null && tree.def.mods.annotations.nonEmpty()) {
1161 printTypeAnnotations(tree.def.mods.annotations);
1162 }
1163 printExpr(tree.clazz);
1164 print("(");
1165 printExprs(tree.args);
1166 print(")");
1167 if (tree.def != null) {
1168 Name enclClassNamePrev = enclClassName;
1169 enclClassName =
1170 tree.def.name != null ? tree.def.name :
1171 tree.type != null && tree.type.tsym.name != tree.type.tsym.name.table.names.empty
1172 ? tree.type.tsym.name : null;
1173 if ((tree.def.mods.flags & Flags.ENUM) != 0) print("/*enum*/");
1174 printBlock(tree.def.defs);
1175 enclClassName = enclClassNamePrev;
1176 }
1177 } catch (IOException e) {
1178 throw new UncheckedIOException(e);
1179 }
1180 }
1181
1182 public void visitNewArray(JCNewArray tree) {
1183 try {
1184 if (tree.elemtype != null) {
1185 print("new ");
1186 JCTree elem = tree.elemtype;
1187 printBaseElementType(elem);
1188
1189 if (!tree.annotations.isEmpty()) {
1190 print(' ');
1191 printTypeAnnotations(tree.annotations);
1192 }
1193 if (tree.elems != null) {
1194 print("[]");
1195 }
1196
1197 int i = 0;
1198 List<List<JCAnnotation>> da = tree.dimAnnotations;
1199 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1200 if (da.size() > i && !da.get(i).isEmpty()) {
1201 print(' ');
1202 printTypeAnnotations(da.get(i));
1203 }
1204 print("[");
1205 i++;
1206 printExpr(l.head);
1207 print("]");
1208 }
1209 printBrackets(elem);
1210 }
1211 if (tree.elems != null) {
1212 print("{");
1213 printExprs(tree.elems);
1214 print("}");
1215 }
1216 } catch (IOException e) {
1217 throw new UncheckedIOException(e);
1218 }
1219 }
1220
1221 public void visitLambda(JCLambda tree) {
1222 try {
1223 print("(");
1224 if (tree.paramKind == JCLambda.ParameterKind.EXPLICIT) {
1225 printExprs(tree.params);
1226 } else {
1227 String sep = "";
1228 for (JCVariableDecl param : tree.params) {
1229 print(sep);
1230 print(param.name);
1231 sep = ",";
1232 }
1233 }
1234 print(")->");
1235 printExpr(tree.body);
1236 } catch (IOException e) {
1237 throw new UncheckedIOException(e);
1238 }
1239 }
1240
1241 public void visitParens(JCParens tree) {
1242 try {
1243 print("(");
1244 printExpr(tree.expr);
1245 print(")");
1246 } catch (IOException e) {
1247 throw new UncheckedIOException(e);
1248 }
1249 }
1250
1251 public void visitAssign(JCAssign tree) {
1252 try {
1253 open(prec, TreeInfo.assignPrec);
1254 printExpr(tree.lhs, TreeInfo.assignPrec + 1);
1255 print(" = ");
1256 printExpr(tree.rhs, TreeInfo.assignPrec);
1257 close(prec, TreeInfo.assignPrec);
1258 } catch (IOException e) {
1259 throw new UncheckedIOException(e);
1260 }
1261 }
1262
1263 public String operatorName(JCTree.Tag tag) {
1264 switch(tag) {
1265 case POS: return "+";
1266 case NEG: return "-";
1267 case NOT: return "!";
1268 case COMPL: return "~";
1269 case PREINC: return "++";
1270 case PREDEC: return "--";
1271 case POSTINC: return "++";
1272 case POSTDEC: return "--";
1273 case NULLCHK: return "<*nullchk*>";
1274 case OR: return "||";
1275 case AND: return "&&";
1276 case EQ: return "==";
1277 case NE: return "!=";
1278 case LT: return "<";
1279 case GT: return ">";
1280 case LE: return "<=";
1281 case GE: return ">=";
1282 case BITOR: return "|";
1283 case BITXOR: return "^";
1284 case BITAND: return "&";
1285 case SL: return "<<";
1286 case SR: return ">>";
1287 case USR: return ">>>";
1288 case PLUS: return "+";
1289 case MINUS: return "-";
1290 case MUL: return "*";
1291 case DIV: return "/";
1292 case MOD: return "%";
1293 default: throw new Error();
1294 }
1295 }
1296
1297 public void visitAssignop(JCAssignOp tree) {
1298 try {
1299 open(prec, TreeInfo.assignopPrec);
1300 printExpr(tree.lhs, TreeInfo.assignopPrec + 1);
1301 print(" " + operatorName(tree.getTag().noAssignOp()) + "= ");
1302 printExpr(tree.rhs, TreeInfo.assignopPrec);
1303 close(prec, TreeInfo.assignopPrec);
1304 } catch (IOException e) {
1305 throw new UncheckedIOException(e);
1306 }
1307 }
1308
1309 public void visitUnary(JCUnary tree) {
1310 try {
1311 int ownprec = TreeInfo.opPrec(tree.getTag());
1312 String opname = operatorName(tree.getTag());
1313 open(prec, ownprec);
1314 if (!tree.getTag().isPostUnaryOp()) {
1315 print(opname);
1316 printExpr(tree.arg, ownprec);
1317 } else {
1318 printExpr(tree.arg, ownprec);
1319 print(opname);
1320 }
1321 close(prec, ownprec);
1322 } catch (IOException e) {
1323 throw new UncheckedIOException(e);
1324 }
1325 }
1326
1327 public void visitBinary(JCBinary tree) {
1328 try {
1329 int ownprec = TreeInfo.opPrec(tree.getTag());
1330 String opname = operatorName(tree.getTag());
1331 open(prec, ownprec);
1332 printExpr(tree.lhs, ownprec);
1333 print(" " + opname + " ");
1334 printExpr(tree.rhs, ownprec + 1);
1335 close(prec, ownprec);
1336 } catch (IOException e) {
1337 throw new UncheckedIOException(e);
1338 }
1339 }
1340
1341 public void visitTypeCast(JCTypeCast tree) {
1342 try {
1343 open(prec, TreeInfo.prefixPrec);
1344 print("(");
1345 printExpr(tree.clazz);
1346 print(")");
1347 printExpr(tree.expr, TreeInfo.prefixPrec);
1348 close(prec, TreeInfo.prefixPrec);
1349 } catch (IOException e) {
1350 throw new UncheckedIOException(e);
1351 }
1352 }
1353
1354 public void visitTypeTest(JCInstanceOf tree) {
1355 try {
1356 open(prec, TreeInfo.ordPrec);
1357 printExpr(tree.expr, TreeInfo.ordPrec);
1358 print(" instanceof ");
1359 if (tree.pattern instanceof JCPattern) {
1360 printPattern(tree.pattern);
1361 } else {
1362 printExpr(tree.getType(), TreeInfo.ordPrec + 1);
1363 }
1364 close(prec, TreeInfo.ordPrec);
1365 } catch (IOException e) {
1366 throw new UncheckedIOException(e);
1367 }
1368 }
1369
1370 public void visitIndexed(JCArrayAccess tree) {
1371 try {
1372 printExpr(tree.indexed, TreeInfo.postfixPrec);
1373 print("[");
1374 printExpr(tree.index);
1375 print("]");
1376 } catch (IOException e) {
1377 throw new UncheckedIOException(e);
1378 }
1379 }
1380
1381 public void visitSelect(JCFieldAccess tree) {
1382 try {
1383 printExpr(tree.selected, TreeInfo.postfixPrec);
1384 print("." + tree.name);
1385 } catch (IOException e) {
1386 throw new UncheckedIOException(e);
1387 }
1388 }
1389
1390 public void visitReference(JCMemberReference tree) {
1391 try {
1392 printExpr(tree.expr);
1393 print("::");
1394 if (tree.typeargs != null) {
1395 print("<");
1396 printExprs(tree.typeargs);
1397 print(">");
1398 }
1399 print(tree.getMode() == ReferenceMode.INVOKE ? tree.name : "new");
1400 } catch (IOException e) {
1401 throw new UncheckedIOException(e);
1402 }
1403 }
1404
1405 public void visitIdent(JCIdent tree) {
1406 try {
1407 print(tree.name);
1408 } catch (IOException e) {
1409 throw new UncheckedIOException(e);
1410 }
1411 }
1412
1413 public void visitLiteral(JCLiteral tree) {
1414 try {
1415 switch (tree.typetag) {
1416 case INT:
1417 print(tree.value.toString());
1418 break;
1419 case LONG:
1420 print(tree.value + "L");
1421 break;
1422 case FLOAT:
1423 print(tree.value + "F");
1424 break;
1425 case DOUBLE:
1426 print(tree.value.toString());
1427 break;
1428 case CHAR:
1429 print("\'" +
1430 Convert.quote(
1431 String.valueOf((char)((Number)tree.value).intValue())) +
1432 "\'");
1433 break;
1434 case BOOLEAN:
1435 print(((Number)tree.value).intValue() == 1 ? "true" : "false");
1436 break;
1437 case BOT:
1438 print("null");
1439 break;
1440 default:
1441 print("\"" + Convert.quote(tree.value.toString()) + "\"");
1442 break;
1443 }
1444 } catch (IOException e) {
1445 throw new UncheckedIOException(e);
1446 }
1447 }
1448
1449 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
1450 try {
1451 switch(tree.typetag) {
1452 case BYTE:
1453 print("byte");
1454 break;
1455 case CHAR:
1456 print("char");
1457 break;
1458 case SHORT:
1459 print("short");
1460 break;
1461 case INT:
1462 print("int");
1463 break;
1464 case LONG:
1465 print("long");
1466 break;
1467 case FLOAT:
1468 print("float");
1469 break;
1470 case DOUBLE:
1471 print("double");
1472 break;
1473 case BOOLEAN:
1474 print("boolean");
1475 break;
1476 case VOID:
1477 print("void");
1478 break;
1479 default:
1480 print("error");
1481 break;
1482 }
1483 } catch (IOException e) {
1484 throw new UncheckedIOException(e);
1485 }
1486 }
1487
1488 public void visitTypeArray(JCArrayTypeTree tree) {
1489 try {
1490 printBaseElementType(tree);
1491 printBrackets(tree);
1492 } catch (IOException e) {
1493 throw new UncheckedIOException(e);
1494 }
1495 }
1496
1497 // Prints the inner element type of a nested array
1498 private void printBaseElementType(JCTree tree) throws IOException {
1499 printExpr(TreeInfo.innermostType(tree, false));
1500 }
1501
1502 // prints the brackets of a nested array in reverse order
1503 // tree is either JCArrayTypeTree or JCAnnotatedTypeTree
1504 private void printBrackets(JCTree tree) throws IOException {
1505 JCTree elem = tree;
1506 while (true) {
1507 if (elem.hasTag(ANNOTATED_TYPE)) {
1508 JCAnnotatedType atype = (JCAnnotatedType) elem;
1509 elem = atype.underlyingType;
1510 if (elem.hasTag(TYPEARRAY)) {
1511 print(' ');
1512 printTypeAnnotations(atype.annotations);
1513 }
1514 }
1515 if (elem.hasTag(TYPEARRAY)) {
1516 print("[]");
1517 elem = ((JCArrayTypeTree)elem).elemtype;
1518 } else {
1519 break;
1520 }
1521 }
1522 }
1523
1524 public void visitTypeApply(JCTypeApply tree) {
1525 try {
1526 printExpr(tree.clazz);
1527 print("<");
1528 printExprs(tree.arguments);
1529 print(">");
1530 } catch (IOException e) {
1531 throw new UncheckedIOException(e);
1532 }
1533 }
1534
1535 public void visitTypeUnion(JCTypeUnion tree) {
1536 try {
1537 printExprs(tree.alternatives, " | ");
1538 } catch (IOException e) {
1539 throw new UncheckedIOException(e);
1540 }
1541 }
1542
1543 public void visitTypeIntersection(JCTypeIntersection tree) {
1544 try {
1545 printExprs(tree.bounds, " & ");
1546 } catch (IOException e) {
1547 throw new UncheckedIOException(e);
1548 }
1549 }
1550
1551 public void visitTypeParameter(JCTypeParameter tree) {
1552 try {
1553 if (tree.annotations.nonEmpty()) {
1554 this.printTypeAnnotations(tree.annotations);
1555 }
1556 print(tree.name);
1557 if (tree.bounds.nonEmpty()) {
1558 print(" extends ");
1559 printExprs(tree.bounds, " & ");
1560 }
1561 } catch (IOException e) {
1562 throw new UncheckedIOException(e);
1563 }
1564 }
1565
1566 @Override
1567 public void visitWildcard(JCWildcard tree) {
1568 try {
1569 print(tree.kind);
1570 if (tree.kind.kind != BoundKind.UNBOUND)
1571 printExpr(tree.inner);
1572 } catch (IOException e) {
1573 throw new UncheckedIOException(e);
1574 }
1575 }
1576
1577 @Override
1578 public void visitTypeBoundKind(TypeBoundKind tree) {
1579 try {
1580 print(String.valueOf(tree.kind));
1581 } catch (IOException e) {
1582 throw new UncheckedIOException(e);
1583 }
1584 }
1585
1586 public void visitErroneous(JCErroneous tree) {
1587 try {
1588 print("(ERROR)");
1589 } catch (IOException e) {
1590 throw new UncheckedIOException(e);
1591 }
1592 }
1593
1594 public void visitLetExpr(LetExpr tree) {
1595 try {
1596 print("(let " + tree.defs + " in " + tree.expr + ")");
1597 } catch (IOException e) {
1598 throw new UncheckedIOException(e);
1599 }
1600 }
1601
1602 public void visitModifiers(JCModifiers mods) {
1603 try {
1604 printAnnotations(mods.annotations);
1605 printFlags(mods.flags);
1606 } catch (IOException e) {
1607 throw new UncheckedIOException(e);
1608 }
1609 }
1610
1611 public void visitAnnotation(JCAnnotation tree) {
1612 try {
1613 print("@");
1614 printExpr(tree.annotationType);
1615 if (!tree.args.isEmpty()) {
1616 print("(");
1617 printExprs(tree.args);
1618 print(")");
1619 }
1620 } catch (IOException e) {
1621 throw new UncheckedIOException(e);
1622 }
1623 }
1624
1625 public void visitAnnotatedType(JCAnnotatedType tree) {
1626 try {
1627 if (tree.underlyingType.hasTag(SELECT)) {
1628 JCFieldAccess access = (JCFieldAccess) tree.underlyingType;
1629 printExpr(access.selected, TreeInfo.postfixPrec);
1630 print(".");
1631 printTypeAnnotations(tree.annotations);
1632 print(access.name);
1633 } else if (tree.underlyingType.hasTag(TYPEARRAY)) {
1634 printBaseElementType(tree);
1635 printBrackets(tree);
1636 } else {
1637 printTypeAnnotations(tree.annotations);
1638 printExpr(tree.underlyingType);
1639 }
1640 } catch (IOException e) {
1641 throw new UncheckedIOException(e);
1642 }
1643 }
1644
1645 public void visitTree(JCTree tree) {
1646 try {
1647 print("(UNKNOWN: " + tree.getTag() + ")");
1648 println();
1649 } catch (IOException e) {
1650 throw new UncheckedIOException(e);
1651 }
1652 }
1653
1654 }