| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jshell; |
| |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * Within a String, mask code comments and ignored modifiers (within context). |
| * |
| * @author Robert Field |
| */ |
| class MaskCommentsAndModifiers { |
| |
| private final static Set<String> IGNORED_MODIFIERS = |
| Stream.of( "public", "protected", "private", "static", "final" ) |
| .collect( Collectors.toSet() ); |
| |
| private final static Set<String> OTHER_MODIFIERS = |
| Stream.of( "abstract", "strictfp", "transient", "volatile", "synchronized", "native", "default" ) |
| .collect( Collectors.toSet() ); |
| |
| // Builder to accumulate non-masked characters |
| private final StringBuilder sbCleared = new StringBuilder(); |
| |
| // Builder to accumulate masked characters |
| private final StringBuilder sbMask = new StringBuilder(); |
| |
| // The input string |
| private final String str; |
| |
| // Entire input string length |
| private final int length; |
| |
| // The next character position |
| private int next = 0; |
| |
| // The current character |
| private int c; |
| |
| // Do we mask-off ignored modifiers? Set by parameter and turned off after |
| // initial modifier section |
| private boolean maskModifiers; |
| |
| // Does the string end with an unclosed '/*' style comment? |
| private boolean openComment = false; |
| |
| MaskCommentsAndModifiers(String s, boolean maskModifiers) { |
| this.str = s; |
| this.length = s.length(); |
| this.maskModifiers = maskModifiers; |
| read(); |
| while (c >= 0) { |
| next(); |
| read(); |
| } |
| } |
| |
| String cleared() { |
| return sbCleared.toString(); |
| } |
| |
| String mask() { |
| return sbMask.toString(); |
| } |
| |
| boolean endsWithOpenComment() { |
| return openComment; |
| } |
| |
| /****** private implementation methods ******/ |
| |
| /** |
| * Read the next character |
| */ |
| private int read() { |
| return c = (next >= length) |
| ? -1 |
| : str.charAt(next++); |
| } |
| |
| private void unread() { |
| if (c >= 0) { |
| --next; |
| } |
| } |
| |
| private void writeTo(StringBuilder sb, int ch) { |
| sb.append((char)ch); |
| } |
| |
| private void write(int ch) { |
| if (ch != -1) { |
| writeTo(sbCleared, ch); |
| writeTo(sbMask, Character.isWhitespace(ch) ? ch : ' '); |
| } |
| } |
| |
| private void writeMask(int ch) { |
| if (ch != -1) { |
| writeTo(sbMask, ch); |
| writeTo(sbCleared, Character.isWhitespace(ch) ? ch : ' '); |
| } |
| } |
| |
| private void write(CharSequence s) { |
| for (int cp : s.chars().toArray()) { |
| write(cp); |
| } |
| } |
| |
| private void writeMask(CharSequence s) { |
| for (int cp : s.chars().toArray()) { |
| writeMask(cp); |
| } |
| } |
| |
| private void next() { |
| switch (c) { |
| case '\'': |
| case '"': |
| maskModifiers = false; |
| write(c); |
| int match = c; |
| while (read() >= 0 && c != match && c != '\n' && c != '\r') { |
| write(c); |
| if (c == '\\') { |
| write(read()); |
| } |
| } |
| write(c); // write match // line-end |
| break; |
| case '/': |
| read(); |
| switch (c) { |
| case '*': |
| writeMask('/'); |
| writeMask(c); |
| int prevc = 0; |
| while (read() >= 0 && (c != '/' || prevc != '*')) { |
| writeMask(c); |
| prevc = c; |
| } |
| writeMask(c); |
| openComment = c < 0; |
| break; |
| case '/': |
| writeMask('/'); |
| writeMask(c); |
| while (read() >= 0 && c != '\n' && c != '\r') { |
| writeMask(c); |
| } |
| writeMask(c); |
| break; |
| default: |
| maskModifiers = false; |
| write('/'); |
| unread(); |
| break; |
| } |
| break; |
| case '@': |
| do { |
| write(c); |
| read(); |
| } while (Character.isJavaIdentifierPart(c)); |
| while (Character.isWhitespace(c)) { |
| write(c); |
| read(); |
| } |
| // if this is an annotation with arguments, process those recursively |
| if (c == '(') { |
| write(c); |
| boolean prevMaskModifiers = maskModifiers; |
| int parenCnt = 1; |
| while (read() >= 0) { |
| if (c == ')') { |
| if (--parenCnt == 0) { |
| break; |
| } |
| } else if (c == '(') { |
| ++parenCnt; |
| } |
| next(); // recurse to handle quotes and comments |
| } |
| write(c); |
| // stuff in annotation arguments doesn't effect inside determination |
| maskModifiers = prevMaskModifiers; |
| } else { |
| unread(); |
| } |
| break; |
| default: |
| if (Character.isJavaIdentifierStart(c)) { |
| StringBuilder sb = new StringBuilder(); |
| do { |
| writeTo(sb, c); |
| read(); |
| } while (Character.isJavaIdentifierPart(c)); |
| unread(); |
| String id = sb.toString(); |
| if (maskModifiers && IGNORED_MODIFIERS.contains(id)) { |
| writeMask(sb); |
| } else { |
| write(sb); |
| if (maskModifiers && !OTHER_MODIFIERS.contains(id)) { |
| maskModifiers = false; |
| } |
| } |
| } else { |
| if (!Character.isWhitespace(c)) { |
| maskModifiers = false; |
| } |
| write(c); |
| } |
| break; |
| } |
| } |
| } |