1 /*
2 * Copyright (c) 2009, 2019, 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.code;
27
28 import java.util.Locale;
29
30 import com.sun.tools.javac.api.Messages;
31 import com.sun.tools.javac.code.Type.ArrayType;
32 import com.sun.tools.javac.code.Symbol.*;
33 import com.sun.tools.javac.code.Type.*;
34 import com.sun.tools.javac.util.List;
35 import com.sun.tools.javac.util.ListBuffer;
36
37 import static com.sun.tools.javac.code.BoundKind.*;
38 import static com.sun.tools.javac.code.Flags.*;
39 import static com.sun.tools.javac.code.Kinds.Kind.*;
40 import static com.sun.tools.javac.code.TypeTag.CLASS;
41 import static com.sun.tools.javac.code.TypeTag.FORALL;
42
43 /**
44 * A combined type/symbol visitor for generating non-trivial localized string
45 * representation of types and symbols.
46 *
47 * <p><b>This is NOT part of any supported API.
48 * If you write code that depends on this, you do so at your own risk.
49 * This code and its internal interfaces are subject to change or
50 * deletion without notice.</b>
51 */
52 public abstract class Printer implements Type.Visitor<String, Locale>, Symbol.Visitor<String, Locale> {
53
54 List<Type> seenCaptured = List.nil();
55 static final int PRIME = 997; // largest prime less than 1000
56
57 protected Printer() { }
58
59 /**
60 * This method should be overridden in order to provide proper i18n support.
61 *
62 * @param locale the locale in which the string is to be rendered
63 * @param key the key corresponding to the message to be displayed
64 * @param args a list of optional arguments
65 * @return localized string representation
66 */
67 protected abstract String localize(Locale locale, String key, Object... args);
68
69 /**
70 * Maps a captured type into an unique identifier.
71 *
72 * @param t the captured type for which an id is to be retrieved
73 * @param locale locale settings
74 * @return unique id representing this captured type
75 */
76 protected abstract String capturedVarId(CapturedType t, Locale locale);
77
78 /**
79 * Create a printer with default i18n support provided by Messages. By default,
80 * captured types ids are generated using hashcode.
81 *
82 * @param messages Messages class to be used for i18n
83 * @return printer visitor instance
84 */
85 public static Printer createStandardPrinter(final Messages messages) {
86 return new Printer() {
87 @Override
88 protected String localize(Locale locale, String key, Object... args) {
89 return messages.getLocalizedString(locale, key, args);
90 }
91
92 @Override
93 protected String capturedVarId(CapturedType t, Locale locale) {
94 return (t.hashCode() & 0xFFFFFFFFL) % PRIME + "";
95 }};
96 }
97
98 /**
99 * Get a localized string representation for all the types in the input list.
100 *
101 * @param ts types to be displayed
102 * @param locale the locale in which the string is to be rendered
103 * @return localized string representation
104 */
105 public String visitTypes(List<Type> ts, Locale locale) {
106 ListBuffer<String> sbuf = new ListBuffer<>();
107 for (Type t : ts) {
108 sbuf.append(visit(t, locale));
109 }
110 return sbuf.toList().toString();
111 }
112
113 /**
114 * * Get a localized string representation for all the symbols in the input list.
115 *
116 * @param ts symbols to be displayed
117 * @param locale the locale in which the string is to be rendered
118 * @return localized string representation
119 */
120 public String visitSymbols(List<Symbol> ts, Locale locale) {
121 ListBuffer<String> sbuf = new ListBuffer<>();
122 for (Symbol t : ts) {
123 sbuf.append(visit(t, locale));
124 }
125 return sbuf.toList().toString();
126 }
127
128 /**
129 * Get a localized string representation for a given type.
130 *
131 * @param t type to be displayed
132 * @param locale the locale in which the string is to be rendered
133 * @return localized string representation
134 */
135 public String visit(Type t, Locale locale) {
136 return t.accept(this, locale);
137 }
138
139 /**
140 * Get a localized string representation for a given symbol.
141 *
142 * @param s symbol to be displayed
143 * @param locale the locale in which the string is to be rendered
144 * @return localized string representation
145 */
146 public String visit(Symbol s, Locale locale) {
147 return s.accept(this, locale);
148 }
149
150 @Override
151 public String visitCapturedType(CapturedType t, Locale locale) {
152 if (seenCaptured.contains(t))
153 return printAnnotations(t) +
154 localize(locale, "compiler.misc.type.captureof.1",
155 capturedVarId(t, locale));
156 else {
157 try {
158 seenCaptured = seenCaptured.prepend(t);
159 return printAnnotations(t) +
160 localize(locale, "compiler.misc.type.captureof",
161 capturedVarId(t, locale),
162 visit(t.wildcard, locale));
163 }
164 finally {
165 seenCaptured = seenCaptured.tail;
166 }
167 }
168 }
169
170 @Override
171 public String visitForAll(ForAll t, Locale locale) {
172 return printAnnotations(t) + "<" + visitTypes(t.tvars, locale) +
173 ">" + visit(t.qtype, locale);
174 }
175
176 @Override
177 public String visitUndetVar(UndetVar t, Locale locale) {
178 if (t.getInst() != null) {
179 return printAnnotations(t) + visit(t.getInst(), locale);
180 } else {
181 return printAnnotations(t) + visit(t.qtype, locale) + "?";
182 }
183 }
184
185 @Override
186 public String visitArrayType(ArrayType t, Locale locale) {
187 StringBuilder res = new StringBuilder();
188 printBaseElementType(t, res, locale);
189 printBrackets(t, res, locale);
190 return res.toString();
191 }
192
193 private String printAnnotations(Type t) {
194 return printAnnotations(t, false);
195 }
196
197 private String printAnnotations(Type t, boolean prefix) {
198 StringBuilder sb = new StringBuilder();
199 List<Attribute.TypeCompound> annos = t.getAnnotationMirrors();
200 if (!annos.isEmpty()) {
201 if (prefix) sb.append(' ');
202 sb.append(annos);
203 sb.append(' ');
204 }
205 return sb.toString();
206 }
207
208 private void printBaseElementType(Type t, StringBuilder sb, Locale locale) {
209 Type arrel = t;
210 while (arrel.hasTag(TypeTag.ARRAY)) {
211 arrel = ((ArrayType) arrel).elemtype;
212 }
213 sb.append(visit(arrel, locale));
214 }
215
216 private void printBrackets(Type t, StringBuilder sb, Locale locale) {
217 Type arrel = t;
218 while (arrel.hasTag(TypeTag.ARRAY)) {
219 sb.append(printAnnotations(arrel, true));
220 sb.append("[]");
221 arrel = ((ArrayType) arrel).elemtype;
222 }
223 }
224
225 @Override
226 public String visitClassType(ClassType t, Locale locale) {
227 StringBuilder buf = new StringBuilder();
228 if (t.getEnclosingType().hasTag(CLASS) && t.tsym.owner.kind == TYP) {
229 buf.append(visit(t.getEnclosingType(), locale));
230 buf.append('.');
231 buf.append(printAnnotations(t));
232 buf.append(className(t, false, locale));
233 } else {
234 buf.append(printAnnotations(t));
235 buf.append(className(t, true, locale));
236 }
237 boolean isReferenceProjection;
238 try {
239 isReferenceProjection = t.isReferenceProjection();
240 } catch (CompletionFailure cf) {
241 isReferenceProjection = false; // handle missing types gracefully.
242 }
243 if (isReferenceProjection) {
244 buf.append('.');
245 buf.append(t.tsym.name.table.names.ref);
246 }
247 if (t.getTypeArguments().nonEmpty()) {
248 buf.append('<');
249 buf.append(visitTypes(t.getTypeArguments(), locale));
250 buf.append('>');
251 }
252 return buf.toString();
253 }
254
255 @Override
256 public String visitMethodType(MethodType t, Locale locale) {
257 return "(" + printMethodArgs(t.argtypes, false, locale) + ")" +
258 visit(t.restype, locale);
259 }
260
261 @Override
262 public String visitPackageType(PackageType t, Locale locale) {
263 return t.tsym.getQualifiedName().toString();
264 }
265
266 @Override
267 public String visitWildcardType(WildcardType t, Locale locale) {
268 StringBuilder s = new StringBuilder();
269 s.append(t.kind);
270 if (t.kind != UNBOUND) {
271 s.append(printAnnotations(t));
272 s.append(visit(t.type, locale));
273 }
274 return s.toString();
275 }
276
277 @Override
278 public String visitErrorType(ErrorType t, Locale locale) {
279 return visitType(t, locale);
280 }
281
282 @Override
283 public String visitTypeVar(TypeVar t, Locale locale) {
284 return visitType(t, locale);
285 }
286
287 @Override
288 public String visitModuleType(ModuleType t, Locale locale) {
289 return visitType(t, locale);
290 }
291
292 public String visitType(Type t, Locale locale) {
293 String s = (t.tsym == null || t.tsym.name == null)
294 ? localize(locale, "compiler.misc.type.none")
295 : t.tsym.name.toString();
296 return s;
297 }
298
299 /**
300 * Converts a class name into a (possibly localized) string. Anonymous
301 * inner classes get converted into a localized string.
302 *
303 * @param t the type of the class whose name is to be rendered
304 * @param longform if set, the class' fullname is displayed - if unset the
305 * short name is chosen (w/o package)
306 * @param locale the locale in which the string is to be rendered
307 * @return localized string representation
308 */
309 protected String className(ClassType t, boolean longform, Locale locale) {
310 Symbol sym = t.tsym;
311 if (sym.name.length() == 0 && (sym.flags() & COMPOUND) != 0) {
312 StringBuilder s = new StringBuilder(visit(t.supertype_field, locale));
313 for (List<Type> is = t.interfaces_field; is.nonEmpty(); is = is.tail) {
314 s.append('&');
315 s.append(visit(is.head, locale));
316 }
317 return s.toString();
318 } else if (sym.name.length() == 0) {
319 String s;
320 ClassType norm = (ClassType) t.tsym.type;
321 if (norm == null) {
322 s = localize(locale, "compiler.misc.anonymous.class", (Object) null);
323 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
324 s = localize(locale, "compiler.misc.anonymous.class",
325 visit(norm.interfaces_field.head, locale));
326 } else {
327 s = localize(locale, "compiler.misc.anonymous.class",
328 visit(norm.supertype_field, locale));
329 }
330 return s;
331 }
332 String s;
333 if (longform) {
334 s = sym.getQualifiedName().toString();
335 } else {
336 s = sym.name.toString();
337 }
338
339 return s;
340 }
341
342 /**
343 * Converts a set of method argument types into their corresponding
344 * localized string representation.
345 *
346 * @param args arguments to be rendered
347 * @param varArgs if true, the last method argument is regarded as a vararg
348 * @param locale the locale in which the string is to be rendered
349 * @return localized string representation
350 */
351 protected String printMethodArgs(List<Type> args, boolean varArgs, Locale locale) {
352 if (!varArgs) {
353 return visitTypes(args, locale);
354 } else {
355 StringBuilder buf = new StringBuilder();
356 while (args.tail.nonEmpty()) {
357 buf.append(visit(args.head, locale));
358 args = args.tail;
359 buf.append(',');
360 }
361 if (args.head.hasTag(TypeTag.ARRAY)) {
362 buf.append(visit(((ArrayType) args.head).elemtype, locale));
363 if (args.head.getAnnotationMirrors().nonEmpty()) {
364 buf.append(' ');
365 buf.append(args.head.getAnnotationMirrors());
366 buf.append(' ');
367 }
368 buf.append("...");
369 } else {
370 buf.append(visit(args.head, locale));
371 }
372 return buf.toString();
373 }
374 }
375
376 @Override
377 public String visitClassSymbol(ClassSymbol sym, Locale locale) {
378 return sym.name.isEmpty()
379 ? localize(locale, "compiler.misc.anonymous.class", sym.flatname)
380 : sym.fullname.toString();
381 }
382
383 @Override
384 public String visitMethodSymbol(MethodSymbol s, Locale locale) {
385 if (s.isStaticOrInstanceInit()) {
386 return s.owner.name.toString();
387 } else {
388 String ms = (s.name == s.name.table.names.init)
389 ? s.owner.name.toString()
390 : s.name.toString();
391 if (s.type != null) {
392 if (s.type.hasTag(FORALL)) {
393 ms = "<" + visitTypes(s.type.getTypeArguments(), locale) + ">" + ms;
394 }
395 ms += "(" + printMethodArgs(
396 s.type.getParameterTypes(),
397 (s.flags() & VARARGS) != 0,
398 locale) + ")";
399 }
400 return ms;
401 }
402 }
403
404 @Override
405 public String visitOperatorSymbol(OperatorSymbol s, Locale locale) {
406 return visitMethodSymbol(s, locale);
407 }
408
409 @Override
410 public String visitPackageSymbol(PackageSymbol s, Locale locale) {
411 return s.isUnnamed()
412 ? localize(locale, "compiler.misc.unnamed.package")
413 : s.fullname.toString();
414 }
415
416 @Override
417 public String visitTypeSymbol(TypeSymbol s, Locale locale) {
418 return visitSymbol(s, locale);
419 }
420
421 @Override
422 public String visitVarSymbol(VarSymbol s, Locale locale) {
423 return visitSymbol(s, locale);
424 }
425
426 @Override
427 public String visitSymbol(Symbol s, Locale locale) {
428 return s.name.toString();
429 }
430 }