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JavaCC is a parser/scanner generator for Java.
/* Copyright (c) 2006, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.javacc.jjtree;
import org.javacc.parser.JavaCCErrors;
/**
* Utilities for manipulating Tokens.
*/
public final class TokenUtils
{
private TokenUtils() {}
static void print(Token t, IO io, String in, String out) {
Token tt = t.specialToken;
if (tt != null) {
while (tt.specialToken != null) tt = tt.specialToken;
while (tt != null) {
io.print(addUnicodeEscapes(tt.image));
tt = tt.next;
}
}
String i = t.image;
if (in != null && i.equals(in)) {
i = out;
}
io.print(addUnicodeEscapes(i));
}
static void print(Token t, IO io) {
print(t, io, null, null);
}
static String addUnicodeEscapes(String str) {
StringBuffer buff = new StringBuffer(str.length());
char ch;
for (int i = 0; i < str.length(); i++) {
ch = str.charAt(i);
if ((ch < 0x20 || ch > 0x7e) && ch != '\t' && ch != '\n' && ch != '\r' && ch != '\f') {
String s = "0000" + Integer.toString(ch, 16);
buff.append("\\u" + s.substring(s.length() - 4, s.length()));
} else {
buff.append(ch);
}
}
return buff.toString();
}
static boolean hasTokens(JJTreeNode n)
{
if (n.getLastToken().next == n.getFirstToken()) {
return false;
} else {
return true;
}
}
static String remove_escapes_and_quotes(Token t, String str) {
String retval = "";
int index = 1;
char ch, ch1;
int ordinal;
while (index < str.length()-1) {
if (str.charAt(index) != '\\') {
retval += str.charAt(index); index++;
continue;
}
index++;
ch = str.charAt(index);
if (ch == 'b') {
retval += '\b'; index++;
continue;
}
if (ch == 't') {
retval += '\t'; index++;
continue;
}
if (ch == 'n') {
retval += '\n'; index++;
continue;
}
if (ch == 'f') {
retval += '\f'; index++;
continue;
}
if (ch == 'r') {
retval += '\r'; index++;
continue;
}
if (ch == '"') {
retval += '\"'; index++;
continue;
}
if (ch == '\'') {
retval += '\''; index++;
continue;
}
if (ch == '\\') {
retval += '\\'; index++;
continue;
}
if (ch >= '0' && ch <= '7') {
ordinal = ((int)ch) - ((int)'0'); index++;
ch1 = str.charAt(index);
if (ch1 >= '0' && ch1 <= '7') {
ordinal = ordinal*8 + ((int)ch1) - ((int)'0'); index++;
ch1 = str.charAt(index);
if (ch <= '3' && ch1 >= '0' && ch1 <= '7') {
ordinal = ordinal*8 + ((int)ch1) - ((int)'0'); index++;
}
}
retval += (char)ordinal;
continue;
}
if (ch == 'u') {
index++; ch = str.charAt(index);
if (hexchar(ch)) {
ordinal = hexval(ch);
index++; ch = str.charAt(index);
if (hexchar(ch)) {
ordinal = ordinal*16 + hexval(ch);
index++; ch = str.charAt(index);
if (hexchar(ch)) {
ordinal = ordinal*16 + hexval(ch);
index++; ch = str.charAt(index);
if (hexchar(ch)) {
ordinal = ordinal*16 + hexval(ch);
index++;
continue;
}
}
}
}
JavaCCErrors.parse_error(t, "Encountered non-hex character '" + ch +
"' at position " + index + " of string - Unicode escape must have 4 hex digits after it.");
return retval;
}
JavaCCErrors.parse_error(t, "Illegal escape sequence '\\" + ch + "' at position " + index + " of string.");
return retval;
}
return retval;
}
private static boolean hexchar(char ch) {
if (ch >= '0' && ch <= '9') return true;
if (ch >= 'A' && ch <= 'F') return true;
if (ch >= 'a' && ch <= 'f') return true;
return false;
}
private static int hexval(char ch) {
if (ch >= '0' && ch <= '9') return ((int)ch) - ((int)'0');
if (ch >= 'A' && ch <= 'F') return ((int)ch) - ((int)'A') + 10;
return ((int)ch) - ((int)'a') + 10;
}
}
/*end*/