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Code Issues Releases Wiki Activity

Process media queries

This commit is contained in:
M66B 2020-04-21 09:04:55 +02:00
parent 313f412251
commit b7dec99987
1 changed files with 64 additions and 30 deletions
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94
app/src/main/java/eu/faircode/email/HtmlHelper.java
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@ -45,7 +45,9 @@ import androidx.core.text.HtmlCompat;
import androidx.core.util.PatternsCompat;
import androidx.preference.PreferenceManager;
import com.steadystate.css.dom.CSSMediaRuleImpl;
import com.steadystate.css.dom.CSSStyleRuleImpl;
import com.steadystate.css.dom.MediaListImpl;
import com.steadystate.css.parser.CSSOMParser;
import com.steadystate.css.parser.SACParserCSS3;
import com.steadystate.css.parser.selectors.ClassConditionImpl;
@ -70,6 +72,7 @@ import org.w3c.css.sac.Selector;
import org.w3c.dom.css.CSSRule;
import org.w3c.dom.css.CSSRuleList;
import org.w3c.dom.css.CSSStyleSheet;
import org.w3c.dom.stylesheets.MediaList;
import java.io.ByteArrayOutputStream;
import java.io.File;
@ -373,11 +376,15 @@ public class HtmlHelper {
}
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style
CSSStyleSheet sheet = null;
List<CSSStyleSheet> sheets = new ArrayList<>();
for (Element style : parsed.head().select("style")) {
Log.i("Style=" + style.data());
try {
InputSource source = new InputSource(new StringReader(style.data()));
String media = style.attr("media");
if (!TextUtils.isEmpty(media))
source.setMedia(media);
CSSOMParser parser = new CSSOMParser(new SACParserCSS3());
parser.setErrorHandler(new ErrorHandler() {
@Override
@ -396,10 +403,7 @@ public class HtmlHelper {
}
});
// TODO: media queries
CSSStyleSheet s = parser.parseStyleSheet(source, null, null);
if (s.getMedia() != null && "all".equals(s.getMedia().getMediaText()))
sheet = s;
sheets.add(parser.parseStyleSheet(source, null, null));
} catch (Throwable ex) {
Log.w(ex);
}
@ -466,31 +470,8 @@ public class HtmlHelper {
String style = element.attr("style");
// Process class
if (!TextUtils.isEmpty(clazz) && sheet != null) {
CSSRuleList rules = sheet.getCssRules();
for (int i = 0; rules != null && i < rules.getLength(); i++) {
CSSRule rule = rules.item(i);
if (rule.getType() == CSSRule.STYLE_RULE) {
CSSStyleRuleImpl srule = (CSSStyleRuleImpl) rule;
for (int j = 0; j < srule.getSelectors().getLength(); j++) {
Selector selector = srule.getSelectors().item(j);
switch (selector.getSelectorType()) {
case Selector.SAC_ANY_NODE_SELECTOR:
style = mergeStyles(srule.getStyle().getCssText(), style);
break;
case Selector.SAC_CONDITIONAL_SELECTOR:
ConditionalSelectorImpl cselector = (ConditionalSelectorImpl) selector;
if (cselector.getCondition().getConditionType() == SAC_CLASS_CONDITION) {
ClassConditionImpl ccondition = (ClassConditionImpl) cselector.getCondition();
if (clazz.equals(ccondition.getValue()))
style = mergeStyles(srule.getStyle().getCssText(), style);
}
break;
}
}
}
}
}
if (!TextUtils.isEmpty(clazz))
style = processClass(clazz, style, sheets);
// Process style
if (!TextUtils.isEmpty(style)) {
@ -925,6 +906,59 @@ public class HtmlHelper {
return document;
}
private static String processClass(String clazz, String style, List<CSSStyleSheet> sheets) {
for (CSSStyleSheet sheet : sheets)
if (isScreenMedia(sheet.getMedia()))
style = processClass(clazz, style, sheet.getCssRules());
return style;
}
private static String processClass(String clazz, String style, CSSRuleList rules) {
for (int i = 0; rules != null && i < rules.getLength(); i++) {
CSSRule rule = rules.item(i);
switch (rule.getType()) {
case CSSRule.STYLE_RULE:
CSSStyleRuleImpl srule = (CSSStyleRuleImpl) rule;
for (int j = 0; j < srule.getSelectors().getLength(); j++) {
Selector selector = srule.getSelectors().item(j);
switch (selector.getSelectorType()) {
case Selector.SAC_CONDITIONAL_SELECTOR:
ConditionalSelectorImpl cselector = (ConditionalSelectorImpl) selector;
if (cselector.getCondition().getConditionType() == SAC_CLASS_CONDITION) {
ClassConditionImpl ccondition = (ClassConditionImpl) cselector.getCondition();
if (clazz.equals(ccondition.getValue()))
style = mergeStyles(srule.getStyle().getCssText(), style);
}
break;
}
}
break;
case CSSRule.MEDIA_RULE:
CSSMediaRuleImpl mrule = (CSSMediaRuleImpl) rule;
if (isScreenMedia(mrule.getMedia()))
style = processClass(clazz, style, mrule.getCssRules());
break;
}
}
return style;
}
private static boolean isScreenMedia(MediaList media) {
// https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries
if (media instanceof MediaListImpl) {
MediaListImpl _media = (MediaListImpl) media;
for (int i = 0; i < _media.getLength(); i++) {
String query = _media.mediaQuery(i).getCssText(null);
if ("all".equals(query) ||
"screen".equals(query) || "only screen".equals(query))
return true;
}
} else
Log.e("Media class=" + media.getClass().getName());
return false;
}
private static String mergeStyles(String base, String style) {
Map<String, String> result = new HashMap<>();