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1 files changed, 283 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/javax/swing/text/html/css/Length.java b/libjava/classpath/gnu/javax/swing/text/html/css/Length.java
new file mode 100644
index 000000000..06fa36e3d
--- /dev/null
+++ b/libjava/classpath/gnu/javax/swing/text/html/css/Length.java
@@ -0,0 +1,283 @@
+/* Length.java -- Converts CSS length values
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.swing.text.html.css;
+
+/**
+ * Converts CSS length values to usable length values.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class Length
+{
+
+  /**
+   * The original value.
+   */
+  private String value;
+
+  /**
+   * The converted value.
+   */
+  protected float floatValue;
+
+  /**
+   * Indicates when the value is a percentage value.
+   */
+  private boolean isPercentage;
+
+  /**
+   * Indicates a length value that is relative to the font size (em).
+   */
+  private boolean isFontEMRelative;
+
+  /**
+   * Indicates a length value that is relative to the font size (ex).
+   */
+  private boolean isFontEXRelative;
+
+  /**
+   * The EM base size.
+   */
+  private float emBase;
+
+  /**
+   * The EX base size.
+   */
+  private float exBase;
+
+  /**
+   * Creates a new length converter instance.
+   *
+   * @param val the CSS value
+   */
+  public Length(String val)
+  {
+    isFontEMRelative = false;
+    isFontEXRelative = false;
+    isPercentage = false;
+    value = val;
+    int i = value.indexOf("px");
+    int percent = value.indexOf("%");
+    int em = value.indexOf("em");
+    int ex = value.indexOf("ex");
+    try
+      {
+        floatValue = 0.0F;
+        if (i != -1)
+          {
+            String sub = value.substring(0, i);
+            floatValue = Float.parseFloat(sub);
+          }
+        else if (percent != -1)
+          {
+            isPercentage = true;
+            String sub = value.substring(0, percent);
+            floatValue = Float.parseFloat(sub) / 100;
+          }
+        else if (em != -1)
+          {
+            isFontEMRelative = true;
+            String sub = value.substring(0, em);
+            floatValue = Float.parseFloat(sub);
+          }
+        else if (ex != -1)
+          {
+            isFontEXRelative = true;
+            String sub = value.substring(0, ex);
+            floatValue = Float.parseFloat(sub);
+          }
+        else
+          {
+            floatValue = Float.parseFloat(value);
+          }
+      }
+    catch (NumberFormatException exc)
+      {
+        // Don't let such small problems interrupt CSS parsing.
+        System.err.println("couldn't parse: " + val);
+      }
+  }
+
+  /**
+   * Returns the value converted to pixels.
+   *
+   * @return the value converted to pixels
+   */
+  public float getValue()
+  {
+    return floatValue;
+  }
+
+  /**
+   * Returns the absolute span for the case when this length value is
+   * a relative value.
+   *
+   * @param base the base span
+   *
+   * @return the absolute span
+   */
+  public float getValue(float base)
+  {
+    float span = floatValue;
+    if (isPercentage)
+      span *= base;
+    else if (isFontEMRelative)
+      span *= emBase;
+    else if (isFontEXRelative)
+      span *= exBase;
+    return span;
+  }
+
+  /**
+   * Sets the font relative EM base.
+   *
+   * @param base the font relative EM base
+   */
+  public void setEMBase(float base)
+  {
+    emBase = base;
+  }
+
+  /**
+   * Sets the font relative EX base.
+   *
+   * @param base the font relative EX base
+   */
+  public void setEXBase(float base)
+  {
+    exBase = base;
+  }
+
+  /**
+   * Sets the font relative base values.
+   *
+   * @param emBase the EM base
+   * @param exBase the EX base
+   */
+  public void setFontBases(float emBase, float exBase)
+  {
+    setEMBase(emBase);
+    setEXBase(exBase);
+  }
+
+  /**
+   * Returns true when this length value is an em font relative value. In
+   * order to get correct results, you need the exBase property set up
+   * correctly.
+   *
+   * @return true when this length value is an ex font relative value
+   */
+  public boolean isFontEMRelative()
+  {
+    return isFontEMRelative;
+  }
+
+  /**
+   * Returns true when this length value is an ex font relative value. In
+   * order to get correct results, you need the emBase property set up
+   * correctly.
+   *
+   * @return true when this length value is an ex font relative value
+   */
+  public boolean isFontEXRelative()
+  {
+    return isFontEXRelative;
+  }
+
+  /**
+   * Returns <code>true</code> when the length value is a percentage
+   * value, <code>false</code> otherwise.
+   *
+   * @return <code>true</code> when the length value is a percentage
+   *         value, <code>false</code> otherwise
+   */
+  public boolean isPercentage()
+  {
+    return isPercentage;
+  }
+
+  /**
+   * Checks if the specified value makes up a valid length value.
+   *
+   * @param value the value to check
+   *
+   * @return <code>true</code> if the value is a valid length
+   */
+  public static boolean isValid(String value)
+  {
+    boolean isValid = true;
+    int px = value.indexOf("px");
+    int em = value.indexOf("em");
+    int ex = value.indexOf("ex");
+    int pc = value.indexOf('%');
+    try
+      {
+        if (px != -1)
+          {
+            Integer.parseInt(value.substring(0, px));
+          }
+        else if (em != -1)
+          {
+            Integer.parseInt(value.substring(0, em));
+          }
+        else if (ex != -1)
+          {
+            Integer.parseInt(value.substring(0, ex));
+          }
+        else if (pc != -1)
+          {
+            Integer.parseInt(value.substring(0, ex));
+          }
+        else
+          {
+            Integer.parseInt(value);
+          }
+      }
+    catch (NumberFormatException nfe)
+      {
+        isValid = false;
+      }
+    return isValid;
+  }
+
+  public String toString()
+  {
+    return value;
+  }
+}