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Parses XML to PDF, with CSS support, using iText
/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Balder Van Camp, Emiel Ackermann, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.tool.xml.css.apply;
import com.itextpdf.text.*;
import com.itextpdf.text.Font;
import com.itextpdf.text.html.HtmlUtilities;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.css.CSS;
import com.itextpdf.tool.xml.css.CssUtils;
import com.itextpdf.tool.xml.css.FontSizeTranslator;
import com.itextpdf.tool.xml.html.CssApplier;
import com.itextpdf.tool.xml.pipeline.html.HtmlPipelineContext;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
/**
* Applies CSS Rules to Chunks
*/
public class ChunkCssApplier implements CssApplier {
/**
* FF4 and IE8 provide normal text and bold text. All other values are translated to one of these 2 styles
* 100 - 500 and "lighter" = normal.
* 600 - 900 and "bolder" = bold.
*/
public static final List BOLD = Arrays.asList(new String[]{"bold", "bolder", "600", "700", "800", "900"});
protected final CssUtils utils = CssUtils.getInstance();
protected FontProvider fontProvider;
public ChunkCssApplier() {
this(null);
}
public ChunkCssApplier(FontProvider fontProvider) {
if (fontProvider != null) {
this.fontProvider = fontProvider;
} else {
this.fontProvider = new FontFactoryImp();
}
}
public Chunk apply(final Chunk c, final Tag t) {
return apply(c, t, null, null, null);
}
/**
*
* @param c the Chunk to apply CSS to.
* @param t the tag containing the chunk data
* @return the styled chunk
*/
public Chunk apply(final Chunk c, final Tag t, final MarginMemory mm, final PageSizeContainable psc, final HtmlPipelineContext ctx) {
Font f = applyFontStyles(t);
float size = f.getSize();
Map rules = t.getCSS();
for (Entry entry : rules.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
if (CSS.Property.FONT_STYLE.equalsIgnoreCase(key)) {
if (value.equalsIgnoreCase(CSS.Value.OBLIQUE)) {
c.setSkew(0, 12);
}
} else if (CSS.Property.LETTER_SPACING.equalsIgnoreCase(key)) {
String letterSpacing = rules.get(CSS.Property.LETTER_SPACING);
float letterSpacingValue = 0f;
if (utils.isRelativeValue(value)) {
letterSpacingValue = utils.parseRelativeValue(letterSpacing, f.getSize());
} else if (utils.isMetricValue(value)){
letterSpacingValue = utils.parsePxInCmMmPcToPt(letterSpacing);
}
c.setCharacterSpacing(letterSpacingValue);
} else if (null != rules.get(CSS.Property.XFA_FONT_HORIZONTAL_SCALE)) { // only % allowed; need a catch block NumberFormatExc?
c.setHorizontalScaling(Float.parseFloat(rules.get(CSS.Property.XFA_FONT_HORIZONTAL_SCALE).replace("%", "")) / 100);
}
}
// following styles are separate from the for each loop, because they are based on font settings like size.
if (null != rules.get(CSS.Property.VERTICAL_ALIGN)) {
String value = rules.get(CSS.Property.VERTICAL_ALIGN);
if (value.equalsIgnoreCase(CSS.Value.SUPER) || value.equalsIgnoreCase(CSS.Value.TOP) || value.equalsIgnoreCase(CSS.Value.TEXT_TOP)) {
c.setTextRise((float) (size / 2 + 0.5));
} else if (value.equalsIgnoreCase(CSS.Value.SUB) || value.equalsIgnoreCase(CSS.Value.BOTTOM) || value.equalsIgnoreCase(CSS.Value.TEXT_BOTTOM)) {
c.setTextRise(-size / 2);
} else {
c.setTextRise(utils.parsePxInCmMmPcToPt(value));
}
}
String xfaVertScale = rules.get(CSS.Property.XFA_FONT_VERTICAL_SCALE);
if (null != xfaVertScale) {
if (xfaVertScale.contains("%")) {
size *= Float.parseFloat(xfaVertScale.replace("%", "")) / 100;
c.setHorizontalScaling(100 / Float.parseFloat(xfaVertScale.replace("%", "")));
}
}
if (null != rules.get(CSS.Property.TEXT_DECORATION)) {
String[] splitValues = rules.get(CSS.Property.TEXT_DECORATION).split("\\s+");
for (String value : splitValues) {
if (CSS.Value.UNDERLINE.equalsIgnoreCase(value)) {
c.setUnderline(null, 0.75f, 0, 0, -0.125f, PdfContentByte.LINE_CAP_BUTT);
}
if (CSS.Value.LINE_THROUGH.equalsIgnoreCase(value)) {
c.setUnderline(null, 0.75f, 0, 0, 0.25f, PdfContentByte.LINE_CAP_BUTT);
}
}
}
if (null != rules.get(CSS.Property.BACKGROUND_COLOR)) {
c.setBackground(HtmlUtilities.decodeColor(rules.get(CSS.Property.BACKGROUND_COLOR)));
}
f.setSize(size);
c.setFont(f);
Float leading = null;
if(rules.get(CSS.Property.LINE_HEIGHT) != null) {
String value = rules.get(CSS.Property.LINE_HEIGHT);
if(utils.isNumericValue(value)) {
leading = Float.parseFloat(value) * c.getFont().getSize();
} else if (utils.isRelativeValue(value)) {
leading = utils.parseRelativeValue(value, c.getFont().getSize());
} else if (utils.isMetricValue(value)){
leading = utils.parsePxInCmMmPcToPt(value);
}
}
if (leading != null) {
c.setLineHeight(leading);
}
return c;
}
public Font applyFontStyles(final Tag t) {
String fontName = null;
String encoding = BaseFont.CP1252;
float size = FontSizeTranslator.getInstance().getFontSize(t);
if (size == Font.UNDEFINED)
size = Font.DEFAULTSIZE;
int style = Font.UNDEFINED;
BaseColor color = null;
Map rules = t.getCSS();
for (Entry entry : rules.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
if (CSS.Property.FONT_WEIGHT.equalsIgnoreCase(key)) {
if (isBoldValue(value)) {
if (style == Font.ITALIC) {
style = Font.BOLDITALIC;
} else {
style = Font.BOLD;
}
} else {
if (style == Font.BOLDITALIC) {
style = Font.ITALIC;
} else if (style == Font.BOLD) {
style = Font.NORMAL;
}
}
} else if (CSS.Property.FONT_STYLE.equalsIgnoreCase(key)) {
if (value.equalsIgnoreCase(CSS.Value.ITALIC)) {
if (style == Font.BOLD) {
style = Font.BOLDITALIC;
} else {
style = Font.ITALIC;
}
}
} else if (CSS.Property.FONT_FAMILY.equalsIgnoreCase(key)) {
// TODO improve fontfamily parsing (what if a font family has a comma in the name ? )
fontName = value;
} else if (CSS.Property.COLOR.equalsIgnoreCase(key)) {
color = HtmlUtilities.decodeColor(value);
}
}
if (fontName != null) {
if (fontName.contains(",")) {
String[] fonts = fontName.split(",");
Font firstFont = null;
for (String s : fonts) {
s = utils.trimAndRemoveQuoutes(s);
if (fontProvider.isRegistered(s)) {
Font f = fontProvider.getFont(s, encoding, BaseFont.EMBEDDED, size, style, color);
if (f != null && (style == Font.NORMAL || style == Font.UNDEFINED || (f.getStyle() & style) == 0)) {
return f;
}
if (firstFont == null) {
firstFont = f;
}
}
}
if (firstFont != null) {
return firstFont;
} else {
if (fonts.length > 0) {
fontName = utils.trimAndRemoveQuoutes(fontName.split(",")[0]);
} else {
fontName = null;
}
}
} else {
fontName = utils.trimAndRemoveQuoutes(fontName);
}
}
return fontProvider.getFont(fontName, encoding, BaseFont.EMBEDDED, size, style, color);
}
/**
* Method used for retrieving the widest word of a chunk of text. All styles of the chunk will be taken into account when calculating the width of the words.
*
* @param c chunk of which the widest word is required.
*
* @return float containing the width of the widest word.
*/
public float getWidestWord(final Chunk c) {
String[] words = c.getContent().split("\\s");
float widestWord = 0;
for (int i = 0; i < words.length; i++) {
Chunk word = new Chunk(words[i]);
copyChunkStyles(c, word);
if (word.getWidthPoint() > widestWord) {
widestWord = word.getWidthPoint();
}
}
return widestWord;
}
/**
* Method used for copying styles from one chunk to another. Could be deprecated if the content of a chunk can be overwritten.
*
* @param source chunk which contains the required styles.
* @param target chunk which needs the required styles.
*/
public void copyChunkStyles(final Chunk source, final Chunk target) {
target.setFont(source.getFont());
target.setAttributes(source.getAttributes());
target.setCharacterSpacing(source.getCharacterSpacing());
target.setHorizontalScaling(source.getHorizontalScaling());
target.setHorizontalScaling(source.getHorizontalScaling());
}
public FontProvider getFontProvider() {
return this.fontProvider;
}
public void setFontProvider(FontProvider fontProvider) {
this.fontProvider = fontProvider;
}
protected boolean isBoldValue(String value) {
value = value.trim();
return CSS.Value.BOLD.contains(value) ||
(value.length() == 3 && value.endsWith("00") && value.charAt(0) >= '6' && value.charAt(0) <= '9');
}
}
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