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org.ddr.poi.html.util.CSSStyleUtils Maven / Gradle / Ivy
package org.ddr.poi.html.util;
import com.steadystate.css.dom.CSSStyleDeclarationImpl;
import com.steadystate.css.dom.CSSValueImpl;
import com.steadystate.css.dom.Property;
import com.steadystate.css.parser.CSSOMParser;
import com.steadystate.css.parser.SACParserCSS3;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.ddr.poi.html.HtmlConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.css.sac.InputSource;
import org.w3c.dom.css.CSSValue;
import java.io.IOException;
import java.io.StringReader;
/**
* CSS样式相关的工具类
*
* @author Draco
* @since 2021-10-11
*/
public class CSSStyleUtils {
private static final Logger log = LoggerFactory.getLogger(CSSStyleUtils.class);
/**
* 空样式
*/
public static final CSSStyleDeclarationImpl EMPTY_STYLE = new EmptyCSSStyle();
/**
* 样式是否为空
*
* @param style 样式声明
* @return 是否为空
*/
public static boolean isEmpty(CSSStyleDeclarationImpl style) {
return style == null || EMPTY_STYLE.equals(style) || style.getProperties().isEmpty();
}
/**
* CSS解析器
*/
public static CSSOMParser newParser() {
return new CSSOMParser(new SACParserCSS3());
}
/**
* 解析行内样式
*
* @param inlineStyle 行内样式声明
* @return 样式
*/
public static CSSStyleDeclarationImpl parse(String inlineStyle) {
if (StringUtils.isBlank(inlineStyle)) {
return new CSSStyleDeclarationImpl();
}
try (StringReader sr = new StringReader(inlineStyle)) {
return (CSSStyleDeclarationImpl) newParser().parseStyleDeclaration(new InputSource(sr));
} catch (IOException e) {
log.warn("Inline style parse error: {}", inlineStyle, e);
return EMPTY_STYLE;
}
}
/**
* 解析样式值
*
* @param value 样式值字符串
* @return 样式值
*/
public static CSSValue parseValue(String value) {
try (StringReader sr = new StringReader(value)) {
return newParser().parsePropertyValue(new InputSource(sr));
} catch (IOException e) {
log.warn("CSS value parse error: {}", value, e);
return new CSSValueImpl();
}
}
/**
* 将样式键值对转换为样式属性
*
* @param key 样式名称
* @param value 样式值
* @return 样式属性
*/
public static Property newProperty(String key, String value) {
return new Property(key, parseValue(value), false);
}
/**
* 分解缩写的样式
*
* @param style 样式声明
*/
public static void split(CSSStyleDeclarationImpl style) {
for (int i = style.getProperties().size() - 1; i >= 0; i--) {
final Property p = style.getProperties().get(i);
if (p != null && p.getValue() != null) {
String name = p.getName().toLowerCase();
CSSValueImpl valueList = (CSSValueImpl) p.getValue();
int length = valueList.getLength();
// 将复合样式拆分成单属性样式
switch (name) {
case HtmlConstants.CSS_BACKGROUND:
splitBackground(valueList, length, style, i);
break;
case HtmlConstants.CSS_BORDER:
splitBorder(valueList, length, style, i);
break;
case HtmlConstants.CSS_BORDER_TOP:
splitBorder(valueList, length, style, i, HtmlConstants.CSS_BORDER_TOP_STYLE,
HtmlConstants.CSS_BORDER_TOP_WIDTH, HtmlConstants.CSS_BORDER_TOP_COLOR);
break;
case HtmlConstants.CSS_BORDER_RIGHT:
splitBorder(valueList, length, style, i, HtmlConstants.CSS_BORDER_RIGHT_STYLE,
HtmlConstants.CSS_BORDER_RIGHT_WIDTH, HtmlConstants.CSS_BORDER_RIGHT_COLOR);
break;
case HtmlConstants.CSS_BORDER_BOTTOM:
splitBorder(valueList, length, style, i, HtmlConstants.CSS_BORDER_BOTTOM_STYLE,
HtmlConstants.CSS_BORDER_BOTTOM_WIDTH, HtmlConstants.CSS_BORDER_BOTTOM_COLOR);
break;
case HtmlConstants.CSS_BORDER_LEFT:
splitBorder(valueList, length, style, i, HtmlConstants.CSS_BORDER_LEFT_STYLE,
HtmlConstants.CSS_BORDER_LEFT_WIDTH, HtmlConstants.CSS_BORDER_LEFT_COLOR);
break;
case HtmlConstants.CSS_BORDER_STYLE:
splitBox(valueList, length, style, i, BoxProperty.BORDER_STYLE);
break;
case HtmlConstants.CSS_BORDER_WIDTH:
splitBox(valueList, length, style, i, BoxProperty.BORDER_WIDTH);
break;
case HtmlConstants.CSS_BORDER_COLOR:
splitBox(valueList, length, style, i, BoxProperty.BORDER_COLOR);
break;
case HtmlConstants.CSS_FONT:
splitFont(valueList, length, style, i);
break;
case HtmlConstants.CSS_MARGIN:
splitBox(valueList, length, style, i, BoxProperty.MARGIN);
break;
case HtmlConstants.CSS_PADDING:
splitBox(valueList, length, style, i, BoxProperty.PADDING);
break;
case HtmlConstants.CSS_LIST_STYLE:
splitListStyle(valueList, length, style, i);
break;
case HtmlConstants.CSS_TEXT_DECORATION:
splitTextDecoration(valueList, length, style, i);
break;
}
}
}
}
private static void splitBackground(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i) {
if (length == 0) {
String cssText = valueList.getCssText().toLowerCase();
String color = Colors.fromStyle(cssText, null);
if (color != null) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_BACKGROUND_COLOR, valueList, false));
}
} else {
for (int j = 0; j < length; j++) {
CSSValue item = valueList.item(j);
String cssText = item.getCssText().toLowerCase();
String color = Colors.fromStyle(cssText, null);
if (color != null) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_BACKGROUND_COLOR, item, false));
break;
}
}
}
}
private static void splitBorder(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i) {
if (length == 0) {
String cssText = valueList.getCssText();
if (StringUtils.isNotBlank(cssText)) {
handleBorderValue(style, i, valueList, cssText);
}
} else {
for (int j = 0; j < length; j++) {
CSSValue item = valueList.item(j);
String value = item.getCssText();
handleBorderValue(style, i, item, value);
}
}
}
private static void splitBorder(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i,
String styleProperty, String widthProperty, String colorProperty) {
if (length == 0) {
String cssText = valueList.getCssText();
if (StringUtils.isNotBlank(cssText)) {
handleBorderValue(style, i, valueList, cssText, styleProperty, widthProperty, colorProperty);
}
} else {
for (int j = 0; j < length; j++) {
CSSValue item = valueList.item(j);
String value = item.getCssText();
handleBorderValue(style, i, item, value, styleProperty, widthProperty, colorProperty);
}
}
}
private static void handleBorderValue(CSSStyleDeclarationImpl style, int i, CSSValue item, String value) {
value = value.toLowerCase();
if (HtmlConstants.BORDER_STYLES.contains(value)) {
BoxProperty.BORDER_STYLE.setValues(style, i, item);
} else if (NamedBorderWidth.contains(value)) {
BoxProperty.BORDER_WIDTH.setValues(style, i, item);
} else if (Character.isDigit(value.charAt(0))) {
CSSLength width = CSSLength.of(value);
if (width.isValid()) {
BoxProperty.BORDER_WIDTH.setValues(style, i, item);
}
} else {
BoxProperty.BORDER_COLOR.setValues(style, i, item);
}
}
private static void handleBorderValue(CSSStyleDeclarationImpl style, int i, CSSValue item, String value,
String styleProperty, String widthProperty, String colorProperty) {
value = value.toLowerCase();
if (HtmlConstants.BORDER_STYLES.contains(value)) {
style.getProperties().add(i, new Property(styleProperty, item, false));
} else if (NamedBorderWidth.contains(value)) {
style.getProperties().add(i, new Property(widthProperty, item, false));
} else if (Character.isDigit(value.charAt(0))) {
CSSLength width = CSSLength.of(value);
if (width.isValid()) {
style.getProperties().add(i, new Property(widthProperty, item, false));
}
} else {
style.getProperties().add(i, new Property(colorProperty, item, false));
}
}
private static void splitFont(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i) {
if (length == 0) {
return;
}
boolean styleHandled = false;
boolean sizeHandled = false;
for (int j = 0; j < length; j++) {
CSSValue item = valueList.item(j);
String value = item.getCssText();
String lowerCase = value.toLowerCase();
if (!styleHandled && HtmlConstants.FONT_STYLES.contains(lowerCase)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_STYLE, item, false));
styleHandled = true;
} else if (HtmlConstants.FONT_VARIANTS.contains(lowerCase)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_VARIANT_CAPS, item, false));
} else if (HtmlConstants.FONT_WEIGHTS.contains(lowerCase) || NumberUtils.isParsable(value)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_WEIGHT, item, false));
} else if (HtmlConstants.SLASH.equals(value)) {
// 字号与行高分隔符
// https://www.w3.org/TR/CSS22/fonts.html#value-def-absolute-size
// xx-small, x-small, small, medium, large, x-large, xx-large, xxx-large
// 1, , 2, 3, 4, 5, 6, 7
// FIXME font元素由于已废弃暂不支持
// 长度/百分比
CSSValue fontSize = valueList.item(j - 1);
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_SIZE, fontSize, false));
sizeHandled = true;
if (++j < length) {
// 数字/长度/百分比
CSSValue lineHeight = valueList.item(j);
style.getProperties().add(i, new Property(HtmlConstants.CSS_LINE_HEIGHT, lineHeight, false));
}
} else if (HtmlConstants.COMMA.equals(value)) {
// 多个字体之间的分隔符
CSSValue firstFont = valueList.item(j - 1);
if (!sizeHandled) {
CSSValue fontSize = valueList.item(j - 2);
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_SIZE, fontSize, false));
}
if (HtmlConstants.isMajorFont(firstFont.getCssText())) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_FAMILY, firstFont, false));
} else {
for (j++; j < length; j++) {
CSSValue fontFamily = valueList.item(j);
if (HtmlConstants.isMajorFont(fontFamily.getCssText())) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_FAMILY, fontFamily, false));
break;
}
}
}
break;
} else if (j == length - 1) {
// font-family在font中一定是最后出现
style.getProperties().add(i, new Property(HtmlConstants.CSS_FONT_FAMILY, item, false));
}
}
}
private static void splitBox(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i,
BoxProperty boxProperty) {
switch (length) {
// 当仅一个值时实际返回长度为0
case 0:
case 1:
if (StringUtils.isNotBlank(valueList.getCssText())) {
boxProperty.setValues(style, i, valueList);
}
break;
case 2:
boxProperty.setValues(style, i, valueList.item(0), valueList.item(1));
break;
case 3:
boxProperty.setValues(style, i, valueList.item(0), valueList.item(1), valueList.item(2));
break;
case 4:
boxProperty.setValues(style, i, valueList.item(0), valueList.item(1), valueList.item(2), valueList.item(3));
break;
}
}
private static void splitListStyle(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i) {
switch (length) {
case 0:
case 1:
if (StringUtils.isNotBlank(valueList.getCssText())) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_LIST_STYLE_TYPE, valueList, false));
}
break;
default:
style.getProperties().add(i, new Property(HtmlConstants.CSS_LIST_STYLE_TYPE, valueList.item(0), false));
}
}
private static void splitTextDecoration(CSSValueImpl valueList, int length, CSSStyleDeclarationImpl style, int i) {
if (length == 0) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_TEXT_DECORATION_LINE, valueList, false));
return;
}
StringBuilder lines = new StringBuilder(22);
for (int j = 0; j < length; j++) {
CSSValue item = valueList.item(j);
String value = item.getCssText();
String lowerCase = value.toLowerCase();
if (HtmlConstants.NONE.equals(lowerCase)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_TEXT_DECORATION_LINE, item, false));
break;
}
if (HtmlConstants.TEXT_DECORATION_LINES.contains(lowerCase)) {
if (lines.length() > 0) {
lines.append(' ');
}
lines.append(lowerCase);
} else if (HtmlConstants.TEXT_DECORATION_STYLES.contains(lowerCase)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_TEXT_DECORATION_STYLE, item, false));
} else if (Colors.maybe(lowerCase)) {
style.getProperties().add(i, new Property(HtmlConstants.CSS_TEXT_DECORATION_COLOR, item, false));
}
}
if (lines.length() > 0) {
style.getProperties().add(i, newProperty(HtmlConstants.CSS_TEXT_DECORATION_LINE, lines.toString()));
}
}
}
