Class with utility methods for fonts.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196482 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/java/org/apache/fop/fonts/FontUtil.java b/src/java/org/apache/fop/fonts/FontUtil.java
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+/*
+ * $Id$
+ * ============================================================================
+ *                    The Apache Software License, Version 1.1
+ * ============================================================================
+ * 
+ * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 
+ * 2. 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.
+ * 
+ * 3. The end-user documentation included with the redistribution, if any, must
+ *    include the following acknowledgment: "This product includes software
+ *    developed by the Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself, if
+ *    and wherever such third-party acknowledgments normally appear.
+ * 
+ * 4. The names "FOP" and "Apache Software Foundation" must not be used to
+ *    endorse or promote products derived from this software without prior
+ *    written permission. For written permission, please contact
+ *    apache@apache.org.
+ * 
+ * 5. Products derived from this software may not be called "Apache", nor may
+ *    "Apache" appear in their name, without prior written permission of the
+ *    Apache Software Foundation.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
+ * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
+ * DING, 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.
+ * ============================================================================
+ * 
+ * This software consists of voluntary contributions made by many individuals
+ * on behalf of the Apache Software Foundation and was originally created by
+ * James Tauber <jtauber@jtauber.com>. For more information on the Apache
+ * Software Foundation, please see <http://www.apache.org/>.
+ */ 
+package org.apache.fop.fonts;
+
+/**
+ * Font utilities.
+ */
+public class FontUtil {
+
+    /**
+     * Parses an CSS2 (SVG and XSL-FO) font weight (normal, bold, 100-900) to 
+     * an integer.
+     * See http://www.w3.org/TR/REC-CSS2/fonts.html#propdef-font-weight
+     * TODO: Implement "lighter" and "bolder".
+     * @param text the font weight to parse
+     * @return an integer between 100 and 900 (100, 200, 300...)
+     */
+    public static int parseCSS2FontWeight(String text) {
+        int weight = 400;
+        try {
+            weight = Integer.parseInt(text);
+            weight = ((int)weight / 100) * 100;
+            weight = Math.max(weight, 100);
+            weight = Math.min(weight, 900);
+        } catch (NumberFormatException nfe) {
+            //weight is no number, so convert symbolic name to number
+            if (text.equals("normal")) {
+                weight = 400;
+            } else if (text.equals("bold")) {
+                weight = 700;
+            } else {
+                throw new IllegalArgumentException(
+                    "Illegal value for font weight: '" 
+                    + text
+                    + "'. Use one of: 100, 200, 300, "
+                    + "400, 500, 600, 700, 800, 900, "
+                    + "normal (=400), bold (=700)");
+            }
+        }
+        return weight;
+    }
+
+}