| /* |
| * Copyright (c) 2010, 2013, 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.nashorn.internal.runtime; |
| |
| import java.util.LinkedList; |
| import java.util.Stack; |
| import java.util.StringTokenizer; |
| |
| /** |
| * A string tokenizer that supports entries with quotes and nested quotes. If |
| * the separators are quoted either by ' and ", or whatever quotes the user |
| * supplies they will be ignored and considered part of another token |
| */ |
| public final class QuotedStringTokenizer { |
| private final LinkedList<String> tokens; |
| |
| private final char quotes[]; |
| |
| /** |
| * Constructor |
| * |
| * @param str string to tokenize |
| */ |
| public QuotedStringTokenizer(final String str) { |
| this(str, " "); |
| } |
| |
| /** |
| * Create a quoted string tokenizer |
| * |
| * @param str |
| * a string to tokenize |
| * @param delim |
| * delimiters between tokens |
| * |
| */ |
| public QuotedStringTokenizer(final String str, final String delim) { |
| this(str, delim, new char[] { '"', '\'' }); |
| } |
| |
| /** |
| * Create a quoted string tokenizer |
| * |
| * @param str |
| * a string to tokenize |
| * @param delim |
| * delimiters between tokens |
| * @param quotes |
| * all the characters that should be accepted as quotes, default |
| * is ' or " |
| */ |
| private QuotedStringTokenizer(final String str, final String delim, final char[] quotes) { |
| this.quotes = quotes; |
| |
| boolean delimIsWhitespace = true; |
| for (int i = 0; i < delim.length(); i++) { |
| if (!Character.isWhitespace(delim.charAt(i))) { |
| delimIsWhitespace = false; |
| break; |
| } |
| } |
| |
| final StringTokenizer st = new StringTokenizer(str, delim); |
| tokens = new LinkedList<>(); |
| while (st.hasMoreTokens()) { |
| String token = st.nextToken(); |
| |
| while (unmatchedQuotesIn(token)) { |
| if (!st.hasMoreTokens()) { |
| throw new IndexOutOfBoundsException(token); |
| } |
| token += (delimIsWhitespace ? " " : delim) + st.nextToken(); |
| } |
| tokens.add(stripQuotes(token)); |
| } |
| } |
| |
| /** |
| * @return the number of tokens in the tokenizer |
| */ |
| public int countTokens() { |
| return tokens.size(); |
| } |
| |
| /** |
| * @return true if there are tokens left |
| */ |
| public boolean hasMoreTokens() { |
| return countTokens() > 0; |
| } |
| |
| /** |
| * @return the next token in the tokenizer |
| */ |
| public String nextToken() { |
| return tokens.removeFirst(); |
| } |
| |
| private String stripQuotes(final String value0) { |
| String value = value0.trim(); |
| for (final char q : quotes) { |
| if (value.length() >= 2 && value.startsWith("" + q) && value.endsWith("" + q)) { |
| // also go over the value and remove \q sequences. they are just |
| // plain q now |
| value = value.substring(1, value.length() - 1); |
| value = value.replace("\\" + q, "" + q); |
| } |
| } |
| return value; |
| } |
| |
| private boolean unmatchedQuotesIn(final String str) { |
| final Stack<Character> quoteStack = new Stack<>(); |
| for (int i = 0; i < str.length(); i++) { |
| final char c = str.charAt(i); |
| for (final char q : this.quotes) { |
| if (c == q) { |
| if (quoteStack.isEmpty()) { |
| quoteStack.push(c); |
| } else { |
| final char top = quoteStack.pop(); |
| if (top != c) { |
| quoteStack.push(top); |
| quoteStack.push(c); |
| } |
| } |
| } |
| } |
| } |
| |
| return !quoteStack.isEmpty(); |
| } |
| } |