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.var);
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 if (tree.var != null) {
949 print(" ");
950 print(tree.var.name);
951 }
952 } catch (IOException e) {
953 throw new UncheckedIOException(e);
954 }
955 }
956
957 public void visitSynchronized(JCSynchronized tree) {
958 try {
959 print("synchronized ");
960 if (tree.lock.hasTag(PARENS)) {
961 printExpr(tree.lock);
962 } else {
963 print("(");
964 printExpr(tree.lock);
965 print(")");
966 }
967 print(" ");
968 printStat(tree.body);
969 } catch (IOException e) {
970 throw new UncheckedIOException(e);
971 }
972 }
973
974 public void visitTry(JCTry tree) {
975 try {
976 print("try ");
977 if (tree.resources.nonEmpty()) {
978 print("(");
979 boolean first = true;
980 for (JCTree var : tree.resources) {
981 if (!first) {
982 println();
983 indent();
984 }
985 printStat(var);
986 first = false;
987 }
988 print(") ");
989 }
990 printStat(tree.body);
991 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
992 printStat(l.head);
993 }
994 if (tree.finalizer != null) {
995 print(" finally ");
996 printStat(tree.finalizer);
997 }
998 } catch (IOException e) {
999 throw new UncheckedIOException(e);
1000 }
1001 }
1002
1003 public void visitCatch(JCCatch tree) {
1004 try {
1005 print(" catch (");
1006 printExpr(tree.param);
1007 print(") ");
1008 printStat(tree.body);
1009 } catch (IOException e) {
1010 throw new UncheckedIOException(e);
1011 }
1012 }
1013
1014 public void visitConditional(JCConditional tree) {
1015 try {
1016 open(prec, TreeInfo.condPrec);
1017 printExpr(tree.cond, TreeInfo.condPrec + 1);
1018 print(" ? ");
1019 printExpr(tree.truepart);
1020 print(" : ");
1021 printExpr(tree.falsepart, TreeInfo.condPrec);
1022 close(prec, TreeInfo.condPrec);
1023 } catch (IOException e) {
1024 throw new UncheckedIOException(e);
1025 }
1026 }
1027
1028 public void visitIf(JCIf tree) {
1029 try {
1030 print("if ");
1031 if (tree.cond.hasTag(PARENS)) {
1032 printExpr(tree.cond);
1033 } else {
1034 print("(");
1035 printExpr(tree.cond);
1036 print(")");
1037 }
1038 print(" ");
1039 printStat(tree.thenpart);
1040 if (tree.elsepart != null) {
1041 print(" else ");
1042 printStat(tree.elsepart);
1043 }
1044 } catch (IOException e) {
1045 throw new UncheckedIOException(e);
1046 }
1047 }
1048
1049 public void visitExec(JCExpressionStatement tree) {
1050 try {
1051 printExpr(tree.expr);
1052 if (prec == TreeInfo.notExpression) print(";");
1053 } catch (IOException e) {
1054 throw new UncheckedIOException(e);
1055 }
1056 }
1057
1058 public void visitBreak(JCBreak tree) {
1059 try {
1060 print("break");
1061 if (tree.label != null) print(" " + tree.label);
1062 print(";");
1063 } catch (IOException e) {
1064 throw new UncheckedIOException(e);
1065 }
1066 }
1067
1068 public void visitYield(JCYield tree) {
1069 try {
1070 print("yield");
1071 print(" ");
1072 printExpr(tree.value);
1073 print(";");
1074 } catch (IOException e) {
1075 throw new UncheckedIOException(e);
1076 }
1077 }
1078
1079 public void visitContinue(JCContinue tree) {
1080 try {
1081 print("continue");
1082 if (tree.label != null) print(" " + tree.label);
1083 print(";");
1084 } catch (IOException e) {
1085 throw new UncheckedIOException(e);
1086 }
1087 }
1088
1089 public void visitReturn(JCReturn tree) {
1090 try {
1091 print("return");
1092 if (tree.expr != null) {
1093 print(" ");
1094 printExpr(tree.expr);
1095 }
1096 print(";");
1097 } catch (IOException e) {
1098 throw new UncheckedIOException(e);
1099 }
1100 }
1101
1102 public void visitThrow(JCThrow tree) {
1103 try {
1104 print("throw ");
1105 printExpr(tree.expr);
1106 print(";");
1107 } catch (IOException e) {
1108 throw new UncheckedIOException(e);
1109 }
1110 }
1111
1112 public void visitAssert(JCAssert tree) {
1113 try {
1114 print("assert ");
1115 printExpr(tree.cond);
1116 if (tree.detail != null) {
1117 print(" : ");
1118 printExpr(tree.detail);
1119 }
1120 print(";");
1121 } catch (IOException e) {
1122 throw new UncheckedIOException(e);
1123 }
1124 }
1125
1126 public void visitApply(JCMethodInvocation tree) {
1127 try {
1128 if (!tree.typeargs.isEmpty()) {
1129 if (tree.meth.hasTag(SELECT)) {
1130 JCFieldAccess left = (JCFieldAccess)tree.meth;
1131 printExpr(left.selected);
1132 print(".<");
1133 printExprs(tree.typeargs);
1134 print(">" + left.name);
1135 } else {
1136 print("<");
1137 printExprs(tree.typeargs);
1138 print(">");
1139 printExpr(tree.meth);
1140 }
1141 } else {
1142 printExpr(tree.meth);
1143 }
1144 print("(");
1145 printExprs(tree.args);
1146 print(")");
1147 } catch (IOException e) {
1148 throw new UncheckedIOException(e);
1149 }
1150 }
1151
1152 public void visitNewClass(JCNewClass tree) {
1153 try {
1154 if (tree.encl != null) {
1155 printExpr(tree.encl);
1156 print(".");
1157 }
1158 print("new ");
1159 if (!tree.typeargs.isEmpty()) {
1160 print("<");
1161 printExprs(tree.typeargs);
1162 print(">");
1163 }
1164 if (tree.def != null && tree.def.mods.annotations.nonEmpty()) {
1165 printTypeAnnotations(tree.def.mods.annotations);
1166 }
1167 printExpr(tree.clazz);
1168 print("(");
1169 printExprs(tree.args);
1170 print(")");
1171 if (tree.def != null) {
1172 Name enclClassNamePrev = enclClassName;
1173 enclClassName =
1174 tree.def.name != null ? tree.def.name :
1175 tree.type != null && tree.type.tsym.name != tree.type.tsym.name.table.names.empty
1176 ? tree.type.tsym.name : null;
1177 if ((tree.def.mods.flags & Flags.ENUM) != 0) print("/*enum*/");
1178 printBlock(tree.def.defs);
1179 enclClassName = enclClassNamePrev;
1180 }
1181 } catch (IOException e) {
1182 throw new UncheckedIOException(e);
1183 }
1184 }
1185
1186 public void visitNewArray(JCNewArray tree) {
1187 try {
1188 if (tree.elemtype != null) {
1189 print("new ");
1190 JCTree elem = tree.elemtype;
1191 printBaseElementType(elem);
1192
1193 if (!tree.annotations.isEmpty()) {
1194 print(' ');
1195 printTypeAnnotations(tree.annotations);
1196 }
1197 if (tree.elems != null) {
1198 print("[]");
1199 }
1200
1201 int i = 0;
1202 List<List<JCAnnotation>> da = tree.dimAnnotations;
1203 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1204 if (da.size() > i && !da.get(i).isEmpty()) {
1205 print(' ');
1206 printTypeAnnotations(da.get(i));
1207 }
1208 print("[");
1209 i++;
1210 printExpr(l.head);
1211 print("]");
1212 }
1213 printBrackets(elem);
1214 }
1215 if (tree.elems != null) {
1216 print("{");
1217 printExprs(tree.elems);
1218 print("}");
1219 }
1220 } catch (IOException e) {
1221 throw new UncheckedIOException(e);
1222 }
1223 }
1224
1225 public void visitLambda(JCLambda tree) {
1226 try {
1227 print("(");
1228 if (tree.paramKind == JCLambda.ParameterKind.EXPLICIT) {
1229 printExprs(tree.params);
1230 } else {
1231 String sep = "";
1232 for (JCVariableDecl param : tree.params) {
1233 print(sep);
1234 print(param.name);
1235 sep = ",";
1236 }
1237 }
1238 print(")->");
1239 printExpr(tree.body);
1240 } catch (IOException e) {
1241 throw new UncheckedIOException(e);
1242 }
1243 }
1244
1245 public void visitParens(JCParens tree) {
1246 try {
1247 print("(");
1248 printExpr(tree.expr);
1249 print(")");
1250 } catch (IOException e) {
1251 throw new UncheckedIOException(e);
1252 }
1253 }
1254
1255 public void visitAssign(JCAssign tree) {
1256 try {
1257 open(prec, TreeInfo.assignPrec);
1258 printExpr(tree.lhs, TreeInfo.assignPrec + 1);
1259 print(" = ");
1260 printExpr(tree.rhs, TreeInfo.assignPrec);
1261 close(prec, TreeInfo.assignPrec);
1262 } catch (IOException e) {
1263 throw new UncheckedIOException(e);
1264 }
1265 }
1266
1267 public String operatorName(JCTree.Tag tag) {
1268 switch(tag) {
1269 case POS: return "+";
1270 case NEG: return "-";
1271 case NOT: return "!";
1272 case COMPL: return "~";
1273 case PREINC: return "++";
1274 case PREDEC: return "--";
1275 case POSTINC: return "++";
1276 case POSTDEC: return "--";
1277 case NULLCHK: return "<*nullchk*>";
1278 case OR: return "||";
1279 case AND: return "&&";
1280 case EQ: return "==";
1281 case NE: return "!=";
1282 case LT: return "<";
1283 case GT: return ">";
1284 case LE: return "<=";
1285 case GE: return ">=";
1286 case BITOR: return "|";
1287 case BITXOR: return "^";
1288 case BITAND: return "&";
1289 case SL: return "<<";
1290 case SR: return ">>";
1291 case USR: return ">>>";
1292 case PLUS: return "+";
1293 case MINUS: return "-";
1294 case MUL: return "*";
1295 case DIV: return "/";
1296 case MOD: return "%";
1297 default: throw new Error();
1298 }
1299 }
1300
1301 public void visitAssignop(JCAssignOp tree) {
1302 try {
1303 open(prec, TreeInfo.assignopPrec);
1304 printExpr(tree.lhs, TreeInfo.assignopPrec + 1);
1305 print(" " + operatorName(tree.getTag().noAssignOp()) + "= ");
1306 printExpr(tree.rhs, TreeInfo.assignopPrec);
1307 close(prec, TreeInfo.assignopPrec);
1308 } catch (IOException e) {
1309 throw new UncheckedIOException(e);
1310 }
1311 }
1312
1313 public void visitUnary(JCUnary tree) {
1314 try {
1315 int ownprec = TreeInfo.opPrec(tree.getTag());
1316 String opname = operatorName(tree.getTag());
1317 open(prec, ownprec);
1318 if (!tree.getTag().isPostUnaryOp()) {
1319 print(opname);
1320 printExpr(tree.arg, ownprec);
1321 } else {
1322 printExpr(tree.arg, ownprec);
1323 print(opname);
1324 }
1325 close(prec, ownprec);
1326 } catch (IOException e) {
1327 throw new UncheckedIOException(e);
1328 }
1329 }
1330
1331 public void visitBinary(JCBinary tree) {
1332 try {
1333 int ownprec = TreeInfo.opPrec(tree.getTag());
1334 String opname = operatorName(tree.getTag());
1335 open(prec, ownprec);
1336 printExpr(tree.lhs, ownprec);
1337 print(" " + opname + " ");
1338 printExpr(tree.rhs, ownprec + 1);
1339 close(prec, ownprec);
1340 } catch (IOException e) {
1341 throw new UncheckedIOException(e);
1342 }
1343 }
1344
1345 public void visitTypeCast(JCTypeCast tree) {
1346 try {
1347 open(prec, TreeInfo.prefixPrec);
1348 print("(");
1349 printExpr(tree.clazz);
1350 print(")");
1351 printExpr(tree.expr, TreeInfo.prefixPrec);
1352 close(prec, TreeInfo.prefixPrec);
1353 } catch (IOException e) {
1354 throw new UncheckedIOException(e);
1355 }
1356 }
1357
1358 public void visitTypeTest(JCInstanceOf tree) {
1359 try {
1360 open(prec, TreeInfo.ordPrec);
1361 printExpr(tree.expr, TreeInfo.ordPrec);
1362 print(" instanceof ");
1363 if (tree.pattern instanceof JCPattern) {
1364 printPattern(tree.pattern);
1365 } else {
1366 printExpr(tree.getType(), TreeInfo.ordPrec + 1);
1367 }
1368 close(prec, TreeInfo.ordPrec);
1369 } catch (IOException e) {
1370 throw new UncheckedIOException(e);
1371 }
1372 }
1373
1374 public void visitIndexed(JCArrayAccess tree) {
1375 try {
1376 printExpr(tree.indexed, TreeInfo.postfixPrec);
1377 print("[");
1378 printExpr(tree.index);
1379 print("]");
1380 } catch (IOException e) {
1381 throw new UncheckedIOException(e);
1382 }
1383 }
1384
1385 public void visitSelect(JCFieldAccess tree) {
1386 try {
1387 printExpr(tree.selected, TreeInfo.postfixPrec);
1388 print("." + tree.name);
1389 } catch (IOException e) {
1390 throw new UncheckedIOException(e);
1391 }
1392 }
1393
1394 public void visitReference(JCMemberReference tree) {
1395 try {
1396 printExpr(tree.expr);
1397 print("::");
1398 if (tree.typeargs != null) {
1399 print("<");
1400 printExprs(tree.typeargs);
1401 print(">");
1402 }
1403 print(tree.getMode() == ReferenceMode.INVOKE ? tree.name : "new");
1404 } catch (IOException e) {
1405 throw new UncheckedIOException(e);
1406 }
1407 }
1408
1409 public void visitIdent(JCIdent tree) {
1410 try {
1411 print(tree.name);
1412 } catch (IOException e) {
1413 throw new UncheckedIOException(e);
1414 }
1415 }
1416
1417 public void visitLiteral(JCLiteral tree) {
1418 try {
1419 switch (tree.typetag) {
1420 case INT:
1421 print(tree.value.toString());
1422 break;
1423 case LONG:
1424 print(tree.value + "L");
1425 break;
1426 case FLOAT:
1427 print(tree.value + "F");
1428 break;
1429 case DOUBLE:
1430 print(tree.value.toString());
1431 break;
1432 case CHAR:
1433 print("\'" +
1434 Convert.quote(
1435 String.valueOf((char)((Number)tree.value).intValue())) +
1436 "\'");
1437 break;
1438 case BOOLEAN:
1439 print(((Number)tree.value).intValue() == 1 ? "true" : "false");
1440 break;
1441 case BOT:
1442 print("null");
1443 break;
1444 default:
1445 print("\"" + Convert.quote(tree.value.toString()) + "\"");
1446 break;
1447 }
1448 } catch (IOException e) {
1449 throw new UncheckedIOException(e);
1450 }
1451 }
1452
1453 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
1454 try {
1455 switch(tree.typetag) {
1456 case BYTE:
1457 print("byte");
1458 break;
1459 case CHAR:
1460 print("char");
1461 break;
1462 case SHORT:
1463 print("short");
1464 break;
1465 case INT:
1466 print("int");
1467 break;
1468 case LONG:
1469 print("long");
1470 break;
1471 case FLOAT:
1472 print("float");
1473 break;
1474 case DOUBLE:
1475 print("double");
1476 break;
1477 case BOOLEAN:
1478 print("boolean");
1479 break;
1480 case VOID:
1481 print("void");
1482 break;
1483 default:
1484 print("error");
1485 break;
1486 }
1487 } catch (IOException e) {
1488 throw new UncheckedIOException(e);
1489 }
1490 }
1491
1492 public void visitTypeArray(JCArrayTypeTree tree) {
1493 try {
1494 printBaseElementType(tree);
1495 printBrackets(tree);
1496 } catch (IOException e) {
1497 throw new UncheckedIOException(e);
1498 }
1499 }
1500
1501 // Prints the inner element type of a nested array
1502 private void printBaseElementType(JCTree tree) throws IOException {
1503 printExpr(TreeInfo.innermostType(tree, false));
1504 }
1505
1506 // prints the brackets of a nested array in reverse order
1507 // tree is either JCArrayTypeTree or JCAnnotatedTypeTree
1508 private void printBrackets(JCTree tree) throws IOException {
1509 JCTree elem = tree;
1510 while (true) {
1511 if (elem.hasTag(ANNOTATED_TYPE)) {
1512 JCAnnotatedType atype = (JCAnnotatedType) elem;
1513 elem = atype.underlyingType;
1514 if (elem.hasTag(TYPEARRAY)) {
1515 print(' ');
1516 printTypeAnnotations(atype.annotations);
1517 }
1518 }
1519 if (elem.hasTag(TYPEARRAY)) {
1520 print("[]");
1521 elem = ((JCArrayTypeTree)elem).elemtype;
1522 } else {
1523 break;
1524 }
1525 }
1526 }
1527
1528 public void visitTypeApply(JCTypeApply tree) {
1529 try {
1530 printExpr(tree.clazz);
1531 print("<");
1532 printExprs(tree.arguments);
1533 print(">");
1534 } catch (IOException e) {
1535 throw new UncheckedIOException(e);
1536 }
1537 }
1538
1539 public void visitTypeUnion(JCTypeUnion tree) {
1540 try {
1541 printExprs(tree.alternatives, " | ");
1542 } catch (IOException e) {
1543 throw new UncheckedIOException(e);
1544 }
1545 }
1546
1547 public void visitTypeIntersection(JCTypeIntersection tree) {
1548 try {
1549 printExprs(tree.bounds, " & ");
1550 } catch (IOException e) {
1551 throw new UncheckedIOException(e);
1552 }
1553 }
1554
1555 public void visitTypeParameter(JCTypeParameter tree) {
1556 try {
1557 if (tree.annotations.nonEmpty()) {
1558 this.printTypeAnnotations(tree.annotations);
1559 }
1560 print(tree.name);
1561 if (tree.bounds.nonEmpty()) {
1562 print(" extends ");
1563 printExprs(tree.bounds, " & ");
1564 }
1565 } catch (IOException e) {
1566 throw new UncheckedIOException(e);
1567 }
1568 }
1569
1570 @Override
1571 public void visitWildcard(JCWildcard tree) {
1572 try {
1573 print(tree.kind);
1574 if (tree.kind.kind != BoundKind.UNBOUND)
1575 printExpr(tree.inner);
1576 } catch (IOException e) {
1577 throw new UncheckedIOException(e);
1578 }
1579 }
1580
1581 @Override
1582 public void visitTypeBoundKind(TypeBoundKind tree) {
1583 try {
1584 print(String.valueOf(tree.kind));
1585 } catch (IOException e) {
1586 throw new UncheckedIOException(e);
1587 }
1588 }
1589
1590 public void visitErroneous(JCErroneous tree) {
1591 try {
1592 print("(ERROR)");
1593 } catch (IOException e) {
1594 throw new UncheckedIOException(e);
1595 }
1596 }
1597
1598 public void visitLetExpr(LetExpr tree) {
1599 try {
1600 print("(let " + tree.defs + " in " + tree.expr + ")");
1601 } catch (IOException e) {
1602 throw new UncheckedIOException(e);
1603 }
1604 }
1605
1606 public void visitModifiers(JCModifiers mods) {
1607 try {
1608 printAnnotations(mods.annotations);
1609 printFlags(mods.flags);
1610 } catch (IOException e) {
1611 throw new UncheckedIOException(e);
1612 }
1613 }
1614
1615 public void visitAnnotation(JCAnnotation tree) {
1616 try {
1617 print("@");
1618 printExpr(tree.annotationType);
1619 if (!tree.args.isEmpty()) {
1620 print("(");
1621 printExprs(tree.args);
1622 print(")");
1623 }
1624 } catch (IOException e) {
1625 throw new UncheckedIOException(e);
1626 }
1627 }
1628
1629 public void visitAnnotatedType(JCAnnotatedType tree) {
1630 try {
1631 if (tree.underlyingType.hasTag(SELECT)) {
1632 JCFieldAccess access = (JCFieldAccess) tree.underlyingType;
1633 printExpr(access.selected, TreeInfo.postfixPrec);
1634 print(".");
1635 printTypeAnnotations(tree.annotations);
1636 print(access.name);
1637 } else if (tree.underlyingType.hasTag(TYPEARRAY)) {
1638 printBaseElementType(tree);
1639 printBrackets(tree);
1640 } else {
1641 printTypeAnnotations(tree.annotations);
1642 printExpr(tree.underlyingType);
1643 }
1644 } catch (IOException e) {
1645 throw new UncheckedIOException(e);
1646 }
1647 }
1648
1649 public void visitTree(JCTree tree) {
1650 try {
1651 print("(UNKNOWN: " + tree.getTag() + ")");
1652 println();
1653 } catch (IOException e) {
1654 throw new UncheckedIOException(e);
1655 }
1656 }
1657
1658 }