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- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.util;
-
- /**
- * This class provides utilities to distinguish various kinds of Unicode
- * whitespace and to get character widths in a given FontState.
- */
- public class CharUtilities {
-
- /**
- * 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;
-
- /**
- * Character class: Unicode white space
- */
- public static final int UCWHITESPACE = 0;
- /**
- * Character class: Line feed
- */
- public static final int LINEFEED = 1;
- /**
- * Character class: Boundary between text runs
- */
- public static final int EOT = 2;
- /**
- * Character class: non-whitespace
- */
- public static final int NONWHITESPACE = 3;
- /**
- * Character class: XML whitespace
- */
- public static final int XMLWHITESPACE = 4;
-
-
- /**
- * Utility class: Constructor prevents instantiating when subclassed.
- */
- protected CharUtilities() {
- throw new UnsupportedOperationException();
- }
-
- /**
- * Return the appropriate CharClass constant for the type
- * of the passed character.
- * @param c character to inspect
- * @return the determined character class
- */
- 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 behavior. Normal behavior means that
- * it's not non-breaking.
- * @param c character to inspect
- * @return True if the character is a normal space
- */
- public static boolean isBreakableSpace(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.
- * @param c character to check
- * @return True if the character is a nbsp
- */
- public static boolean isNonBreakableSpace(char c) {
- return
- (c == '\u00A0' // no-break space
- || c == '\u202F' // narrow no-break space
- || c == '\u3000' // ideographic space
- || c == '\uFEFF'); // zero width no-break space
- }
-
- /**
- * Determines if the character represents any kind of space.
- * @param c character to check
- * @return True if the character represents any kind of space
- */
- public static boolean isAnySpace(char c) {
- boolean ret = (isBreakableSpace(c) || isNonBreakableSpace(c));
- return ret;
- }
- }
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