| /* |
| * 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_MODIFERS = |
| Stream.of( "public", "protected", "private", "static", "final" ) |
| .collect( Collectors.toSet() ); |
| |
| private final StringBuilder sbCleared = new StringBuilder(); |
| private final StringBuilder sbMask = new StringBuilder(); |
| private final String str; |
| private final int length; |
| private final boolean maskModifiers; |
| private int next = 0; |
| private boolean wasMasked = false; |
| private boolean inside = false; |
| |
| @SuppressWarnings("empty-statement") |
| public MaskCommentsAndModifiers(String s, boolean maskModifiers) { |
| this.str = s; |
| this.length = s.length(); |
| this.maskModifiers = maskModifiers; |
| do { } while (next()); |
| } |
| |
| public String cleared() { |
| return sbCleared.toString(); |
| } |
| |
| public String mask() { |
| return sbMask.toString(); |
| } |
| |
| public boolean wasMasked() { |
| return wasMasked; |
| } |
| |
| /** |
| * Read the next character |
| */ |
| private int read() { |
| if (next >= length) { |
| return -1; |
| } |
| return str.charAt(next++); |
| } |
| |
| private void write(StringBuilder sb, int ch) { |
| sb.append((char)ch); |
| } |
| |
| private void write(int ch) { |
| write(sbCleared, ch); |
| write(sbMask, Character.isWhitespace(ch) ? ch : ' '); |
| } |
| |
| private void writeMask(int ch) { |
| wasMasked = true; |
| write(sbMask, ch); |
| write(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 boolean next() { |
| return next(read()); |
| } |
| |
| private boolean next(int c) { |
| if (c < 0) { |
| return false; |
| } |
| |
| if (c == '\'' || c == '"') { |
| inside = true; |
| write(c); |
| int match = c; |
| c = read(); |
| while (c != match) { |
| if (c < 0) { |
| return false; |
| } |
| if (c == '\n' || c == '\r') { |
| write(c); |
| return true; |
| } |
| if (c == '\\') { |
| write(c); |
| c = read(); |
| } |
| write(c); |
| c = read(); |
| } |
| write(c); |
| return true; |
| } |
| |
| if (c == '/') { |
| c = read(); |
| if (c == '*') { |
| writeMask('/'); |
| writeMask(c); |
| int prevc = 0; |
| while ((c = read()) != '/' || prevc != '*') { |
| if (c < 0) { |
| return false; |
| } |
| writeMask(c); |
| prevc = c; |
| } |
| writeMask(c); |
| return true; |
| } else if (c == '/') { |
| writeMask('/'); |
| writeMask(c); |
| while ((c = read()) != '\n' && c != '\r') { |
| if (c < 0) { |
| return false; |
| } |
| writeMask(c); |
| } |
| writeMask(c); |
| return true; |
| } else { |
| inside = true; |
| write('/'); |
| // read character falls through |
| } |
| } |
| |
| if (Character.isJavaIdentifierStart(c)) { |
| if (maskModifiers && !inside) { |
| StringBuilder sb = new StringBuilder(); |
| do { |
| write(sb, c); |
| c = read(); |
| } while (Character.isJavaIdentifierPart(c)); |
| String id = sb.toString(); |
| if (IGNORED_MODIFERS.contains(id)) { |
| writeMask(sb); |
| } else { |
| write(sb); |
| if (id.equals("import")) { |
| inside = true; |
| } |
| } |
| return next(c); // recurse to handle left-over character |
| } |
| } else if (!Character.isWhitespace(c)) { |
| inside = true; |
| } |
| |
| if (c < 0) { |
| return false; |
| } |
| write(c); |
| return true; |
| } |
| } |