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