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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources."
*/
package org.apache.fop.fo;
/**
* A character class allowing to distinguish whitespace, LF, other text.
*/
public class CharClass {
/** Character code used to signal a character boundary in
* inline content, such as an inline with borders and padding
* or a nested block object.
*/
public static final char CODE_EOT=0;
public static final int UCWHITESPACE=0; // unicode white space
public static final int LINEFEED=1;
public static final int EOT=2; // Boundary beteween text runs
public static final int NONWHITESPACE=3;
public static final int XMLWHITESPACE=4;
/**
* Return the appropriate CharClass constant for the type
* of the passed character.
*/
public static int classOf(char c) {
if (c == CODE_EOT) return EOT;
if (c == '\n') return LINEFEED;
if ( c==' '|| c == '\r' || c=='\t' ) return XMLWHITESPACE;
if (isAnySpace(c)) return UCWHITESPACE;
return NONWHITESPACE;
}
/**
* Helper method to determine if the character is a
* space with normal behaviour. Normal behaviour means that
* it's not non-breaking
*/
private static boolean isSpace(char c) {
return (c == ' ' ||
(c >= '\u2000' && c <= '\u200B'));
// c == '\u2000' // en quad
// c == '\u2001' // em quad
// c == '\u2002' // en space
// c == '\u2003' // em space
// c == '\u2004' // three-per-em space
// c == '\u2005' // four--per-em space
// c == '\u2006' // six-per-em space
// c == '\u2007' // figure space
// c == '\u2008' // punctuation space
// c == '\u2009' // thin space
// c == '\u200A' // hair space
// c == '\u200B' // zero width space
}
/**
* Method to determine if the character is a nonbreaking
* space.
*/
private static boolean isNBSP(char c) {
return (c == '\u00A0' || // normal no-break space
c == '\u202F' || // narrow no-break space
c == '\u3000' || // ideographic space
c == '\uFEFF') ; // zero width no-break space
}
/**
* @return true if the character represents any kind of space
*/
private static boolean isAnySpace(char c) {
return (isSpace(c) || isNBSP(c));
}
}
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