| /* FontSize.java -- Converts CSS font size values into real 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 font-size values into real (point) values. |
| * |
| * @author Roman Kennke (kennke@aicas.com) |
| */ |
| public class FontSize |
| { |
| |
| /** |
| * The CSS value. |
| */ |
| private String value; |
| |
| /** |
| * The actual font size. |
| */ |
| private int size; |
| |
| /** |
| * The index of one of the standard sizes that this font size maps to. |
| * This is -1 if this fontsize doesn't map to one of the standard sizes. |
| * |
| * @see #SCALE |
| */ |
| private int sizeIndex; |
| |
| /** |
| * True when this font size is relative. |
| */ |
| private boolean isRelative; |
| |
| /** |
| * The default size for 'medium' absolute size. The other absolute sizes |
| * are calculated from this. |
| */ |
| public static final int DEFAULT_FONT_SIZE = 12; |
| |
| /** |
| * The scaling factors relative to the medium size. Medium is at index 2. |
| */ |
| private static final double[] SCALE = {0.8, 0.9, 1.0, 1.2, 1.4, 1.6, 1.8 }; |
| |
| /** |
| * Creates a new FontSize for the specified value. |
| * |
| * @param val the value to convert |
| */ |
| public FontSize(String val) |
| { |
| value = val; |
| sizeIndex = -1; |
| isRelative = false; |
| size = mapValue(); |
| } |
| |
| /** |
| * Returns the font size value. |
| * |
| * @return the font size value |
| */ |
| public int getValue(int p) |
| { |
| if (isRelative) |
| mapRelative(p); |
| return size; |
| } |
| |
| public int getValue() |
| { |
| assert ! isRelative; |
| return size; |
| } |
| |
| /** |
| * Returns the converted real value in point. |
| * |
| * @return the converted real value in point |
| */ |
| private int mapValue() |
| { |
| int intVal; |
| if (value.contains("pt")) |
| intVal = mapPoints(); |
| else if (value.contains("px")) |
| intVal = mapPixels(); |
| else if (value.contains("em") || value.contains("%") |
| || value.contains("larger") || value.contains("smaller")) |
| { |
| intVal = -1; |
| isRelative = true; |
| } |
| else |
| intVal = mapAbsolute(); |
| return intVal; |
| } |
| |
| /** |
| * Maps point values ('XXXpt'). |
| * |
| * @return the real font size |
| */ |
| private int mapPoints() |
| { |
| int end = value.indexOf("pt"); |
| String number = value.substring(0, end); |
| int intVal = (int) Double.parseDouble(number); |
| return intVal; |
| } |
| |
| /** |
| * Maps pixel values ('XXXpx'). |
| * |
| * @return the real font size |
| */ |
| private int mapPixels() |
| { |
| int end = value.indexOf("px"); |
| if (end == -1) |
| end = value.length(); |
| String number = value.substring(0, end); |
| try |
| { |
| int intVal = (int) Double.parseDouble(number); |
| return intVal; |
| } |
| catch (NumberFormatException ex) |
| { |
| return DEFAULT_FONT_SIZE; |
| } |
| } |
| |
| private int mapPercent(int par) |
| { |
| int end = value.indexOf("%"); |
| if (end == -1) |
| end = value.length(); |
| String number = value.substring(0, end); |
| try |
| { |
| int intVal = (int) Double.parseDouble(number); |
| return intVal * par / 100; |
| } |
| catch (NumberFormatException ex) |
| { |
| System.err.println("couldn't map value: '" + value + "'"); |
| return DEFAULT_FONT_SIZE; |
| } |
| } |
| |
| private int mapEM(int par) |
| { |
| int end = value.indexOf("em"); |
| if (end == -1) |
| end = value.length(); |
| String number = value.substring(0, end); |
| try |
| { |
| float factor = Float.parseFloat(number); |
| // FIXME: Should be relative to the parent element's size. |
| return (int) (factor * par); |
| } |
| catch (NumberFormatException ex) |
| { |
| return DEFAULT_FONT_SIZE; |
| } |
| } |
| |
| private int mapSmaller(int par) |
| { |
| return (int) (par * 0.9); |
| } |
| |
| private int mapLarger(int par) |
| { |
| return (int) (par * 0.9); |
| } |
| |
| /** |
| * Maps absolute font-size values. |
| * |
| * @return the real value |
| */ |
| private int mapAbsolute() |
| { |
| int index; |
| if (value.equals("xx-small") || value.equals("x-small")) |
| index = 0; |
| else if (value.equals("small")) |
| index = 1; |
| else if (value.equals("medium")) |
| index = 2; |
| else if (value.equals("large")) |
| index = 3; |
| else if (value.equals("x-large")) |
| index = 4; |
| else if (value.equals("xx-large")) |
| index = 5; |
| else |
| index = 2; |
| double scale = SCALE[index]; |
| // FIXME: Scale the real medium size of the document, rather than the |
| // constant here. |
| int intVal = (int) (scale * DEFAULT_FONT_SIZE); |
| sizeIndex = index; |
| return intVal; |
| } |
| |
| /** |
| * Returns the string representation. |
| */ |
| public String toString() |
| { |
| return value; |
| } |
| |
| private int mapRelative(int par) |
| { |
| if (value.indexOf('%') != -1) |
| size = mapPercent(par); |
| else if (value.indexOf("em") != -1) |
| size = mapEM(par); |
| else if (value.indexOf("larger") != -1) |
| size = mapLarger(par); |
| else if (value.indexOf("smaller") != -1) |
| size = mapSmaller(par); |
| return size; |
| } |
| |
| public boolean isRelative() |
| { |
| return isRelative; |
| } |
| } |