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Java 1.8+ Library with tons of utility classes required in all projects
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/*
* Copyright (C) 2014-2024 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.helger.commons.text.util;
import javax.annotation.concurrent.Immutable;
import com.helger.commons.annotation.PresentForCodeCoverage;
/**
* This class contains the ABNF (RFC 5234 https://tools.ietf.org/html/rfc5234)
* core rules. All checks can be performed for values in the range 0 ≤ x ≤
* 127.
*
* @author Philip Helger
*/
@Immutable
public final class ABNF
{
public static final int CHECK_RANGE_MIN_INCL = 0x00;
public static final int CHECK_RANGE_MAX_INCL = 0x7f;
private static final int BIT_ALPHA = 0x0001;
private static final int BIT_BIT = 0x0002;
private static final int BIT_CHAR = 0x0004;
private static final int BIT_CR = 0x0008;
private static final int BIT_CTL = 0x0010;
private static final int BIT_DIGIT = 0x0020;
private static final int BIT_DQUOTE = 0x0040;
private static final int BIT_HEXDIGIT = 0x0080;
private static final int BIT_HTAB = 0x0100;
private static final int BIT_LF = 0x0200;
private static final int BIT_SP = 0x0400;
private static final int BIT_VCHAR = 0x0800;
private static final int BIT_WSP = 0x1000;
// ph extensions
// Hex digit, case insensitive
private static final int BIT_HEXDIGIT_CI = 0x10000000;
private static final int [] BITS = new int [] { // 0x00-0x0f
BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL | BIT_HTAB | BIT_WSP,
BIT_CHAR | BIT_CTL | BIT_LF,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL | BIT_CR,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
// 0x10-0x1f
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
BIT_CHAR | BIT_CTL,
// 0x20-0x2f
BIT_CHAR | BIT_SP | BIT_WSP,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_DQUOTE | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
// 0x30-0x3f
BIT_BIT | BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_BIT | BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_DIGIT | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
// 0x40-0x4f
BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_HEXDIGIT | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
// 0x50-0x5f
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
// 0x60-0x6f
BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR | BIT_HEXDIGIT_CI,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
// 0x70-0x7f
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_ALPHA | BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_VCHAR,
BIT_CHAR | BIT_CTL };
static
{
if (BITS.length != 128)
throw new IllegalStateException ("Bits array has an invalid length!");
}
@PresentForCodeCoverage
private static final ABNF INSTANCE = new ABNF ();
private ABNF ()
{}
private static boolean _isBitSet (final int nCP, final int nBit)
{
return nCP >= 0x00 && nCP <= 0x7f && (BITS[nCP] & nBit) == nBit;
}
/**
* Check if the passed code point matches the following rules:
* %x41-5A / %x61-7A ; A-Z / a-z
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isAlpha (final int nCP)
{
return _isBitSet (nCP, BIT_ALPHA);
}
/**
* Check if the passed code point matches the following rules:
* "0" / "1"
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isBit (final int nCP)
{
return _isBitSet (nCP, BIT_BIT);
}
/**
* Check if the passed code point matches the following rules:
* %x01-7F → any 7-bit US-ASCII character, excluding NUL
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isChar (final int nCP)
{
return _isBitSet (nCP, BIT_CHAR);
}
/**
* Check if the passed code point matches the following rules:
* %x0D → carriage return
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isCR (final int nCP)
{
return _isBitSet (nCP, BIT_CR);
}
/**
* Check if the passed code point matches the following rules:
* %x00-1F / %x7F → controls
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isCtl (final int nCP)
{
return _isBitSet (nCP, BIT_CTL);
}
/**
* Check if the passed code point matches the following rules:
* %x30-39 → 0-9
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isDigit (final int nCP)
{
return _isBitSet (nCP, BIT_DIGIT);
}
/**
* Check if the passed code point matches the following rules:
* %x22 → " (Double Quote)
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isDQuote (final int nCP)
{
return _isBitSet (nCP, BIT_DQUOTE);
}
/**
* Check if the passed code point matches the following rules:
* DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
* @see #isHexDigitCaseInsensitive(int)
*/
public static boolean isHexDigit (final int nCP)
{
return _isBitSet (nCP, BIT_HEXDIGIT);
}
/**
* Check if the passed code point matches the following rules:
* DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
* / "a" / "b" / "c" / "d" / "e" / "f"
* Note: this is a non-standard extension!
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
* @see #isHexDigit(int)
*/
public static boolean isHexDigitCaseInsensitive (final int nCP)
{
return _isBitSet (nCP, BIT_HEXDIGIT_CI);
}
/**
* Check if the passed code point matches the following rules:
* %x09 → horizontal tab
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isHTab (final int nCP)
{
return _isBitSet (nCP, BIT_HTAB);
}
/**
* Check if the passed code point matches the following rules:
* %x0A → linefeed
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isLF (final int nCP)
{
return _isBitSet (nCP, BIT_LF);
}
/**
* Check if the passed code point matches the following rules:
* %x00-FF → 8 bits of data
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isOctet (final int nCP)
{
return nCP >= 0x00 && nCP <= 0xff;
}
/**
* Check if the passed code point matches the following rules:
* %x20
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isSP (final int nCP)
{
return _isBitSet (nCP, BIT_SP);
}
/**
* Check if the passed code point matches the following rules:
* %x21-7E → visible (printing) characters
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isVChar (final int nCP)
{
return _isBitSet (nCP, BIT_VCHAR);
}
/**
* Check if the passed code point matches the following rules:
* SP / HTAB → white space
*
* @param nCP
* Code point to check.
* @return true if it matches the rules
*/
public static boolean isWSP (final int nCP)
{
return _isBitSet (nCP, BIT_WSP);
}
}