/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. 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.
*
* 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.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.parser.util;
/**
* @author mycat
* @author mycat
*/
public class CharTypes {
private final static boolean[] hexFlags = new boolean[256];
static {
for (char c = 0; c < hexFlags.length; ++c) {
if (c >= 'A' && c <= 'F') {
hexFlags[c] = true;
} else if (c >= 'a' && c <= 'f') {
hexFlags[c] = true;
} else if (c >= '0' && c <= '9') {
hexFlags[c] = true;
}
}
}
public static boolean isHex(char c) {
return c < 256 && hexFlags[c];
}
public static boolean isDigit(char c) {
return c >= '0' && c <= '9';
}
private final static boolean[] identifierFlags = new boolean[256];
static {
for (char c = 0; c < identifierFlags.length; ++c) {
if (c >= 'A' && c <= 'Z') {
identifierFlags[c] = true;
} else if (c >= 'a' && c <= 'z') {
identifierFlags[c] = true;
} else if (c >= '0' && c <= '9') {
identifierFlags[c] = true;
}
}
// identifierFlags['`'] = true;
identifierFlags['_'] = true;
identifierFlags['$'] = true;
}
public static boolean isIdentifierChar(char c) {
return c > identifierFlags.length || identifierFlags[c];
}
private final static boolean[] whitespaceFlags = new boolean[256];
static {
whitespaceFlags[' '] = true;
whitespaceFlags['\n'] = true;
whitespaceFlags['\r'] = true;
whitespaceFlags['\t'] = true;
whitespaceFlags['\f'] = true;
whitespaceFlags['\b'] = true;
}
/**
* @return false if {@link MySQLLexer#EOI}
*/
public static boolean isWhitespace(char c) {
return c <= whitespaceFlags.length && whitespaceFlags[c];
}
}