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/**
* Copyright (c) 2014, Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mail.utils;
import android.graphics.Color;
import android.graphics.Typeface;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.AbsoluteSizeSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.QuoteSpan;
import android.text.style.StyleSpan;
import android.text.style.TypefaceSpan;
import android.text.style.URLSpan;
import android.text.style.UnderlineSpan;
import com.android.mail.analytics.AnalyticsTimer;
import com.google.android.mail.common.base.CharMatcher;
import com.google.android.mail.common.html.parser.HTML;
import com.google.android.mail.common.html.parser.HTML4;
import com.google.android.mail.common.html.parser.HtmlDocument;
import com.google.android.mail.common.html.parser.HtmlTree;
import com.google.common.collect.Lists;
import java.util.LinkedList;
public class HtmlUtils {
static final String LOG_TAG = LogTag.getLogTag();
/**
* Use our custom SpannedConverter to process the HtmlNode results from HtmlTree.
* @param html
* @return processed HTML as a Spanned
*/
public static Spanned htmlToSpan(String html, HtmlTree.ConverterFactory factory) {
AnalyticsTimer.getInstance().trackStart(AnalyticsTimer.COMPOSE_HTML_TO_SPAN);
// Get the html "tree"
final HtmlTree htmlTree = com.android.mail.utils.Utils.getHtmlTree(html);
htmlTree.setConverterFactory(factory);
final Spanned spanned = htmlTree.getSpanned();
AnalyticsTimer.getInstance().logDuration(AnalyticsTimer.COMPOSE_HTML_TO_SPAN, true,
"compose", "html_to_span", null);
LogUtils.i(LOG_TAG, "htmlToSpan completed, input: %d, result: %d", html.length(),
spanned.length());
return spanned;
}
/**
* Class that handles converting the html into a Spanned.
* This class will only handle a subset of the html tags. Below is the full list:
* - bold
* - italic
* - underline
* - font size
* - font color
* - font face
* - a
* - blockquote
* - p
* - div
*/
public static class SpannedConverter implements HtmlTree.Converter<Spanned> {
// Pinto normal text size is 2 while normal for AbsoluteSizeSpan is 12.
// So 6 seems to be the magic number here. Html.toHtml also uses 6 as divider.
private static final int WEB_TO_ANDROID_SIZE_MULTIPLIER = 6;
protected final SpannableStringBuilder mBuilder = new SpannableStringBuilder();
private final LinkedList<TagWrapper> mSeenTags = Lists.newLinkedList();
private final HtmlTree.DefaultPlainTextConverter mTextConverter =
new HtmlTree.DefaultPlainTextConverter();
private int mTextConverterIndex = 0;
@Override
public void addNode(HtmlDocument.Node n, int nodeNum, int endNum) {
// Feed it into the plain text converter
mTextConverter.addNode(n, nodeNum, endNum);
if (n instanceof HtmlDocument.Tag) {
handleStart((HtmlDocument.Tag) n);
} else if (n instanceof HtmlDocument.EndTag) {
handleEnd((HtmlDocument.EndTag) n);
}
appendPlainTextFromConverter();
}
private void appendPlainTextFromConverter() {
String textString = mTextConverter.getObject();
if (textString.length() > mTextConverterIndex) {
mBuilder.append(textString.substring(mTextConverterIndex));
mTextConverterIndex = textString.length();
}
}
/**
* Helper function to handle start tag
*/
protected void handleStart(HtmlDocument.Tag tag) {
if (!tag.isSelfTerminating()) {
// Add to the stack of tags needing closing tag
mSeenTags.push(new TagWrapper(tag, mBuilder.length()));
}
}
/**
* Helper function to handle end tag
*/
protected void handleEnd(HtmlDocument.EndTag tag) {
TagWrapper lastSeen;
HTML.Element element = tag.getElement();
while ((lastSeen = mSeenTags.poll()) != null && lastSeen.tag.getElement() != null &&
!lastSeen.tag.getElement().equals(element)) { }
// Misformatted html, just ignore this tag
if (lastSeen == null) {
return;
}
Object marker = null;
if (HTML4.B_ELEMENT.equals(element)) {
// BOLD
marker = new StyleSpan(Typeface.BOLD);
} else if (HTML4.I_ELEMENT.equals(element)) {
// ITALIC
marker = new StyleSpan(Typeface.ITALIC);
} else if (HTML4.U_ELEMENT.equals(element)) {
// UNDERLINE
marker = new UnderlineSpan();
} else if (HTML4.A_ELEMENT.equals(element)) {
// A HREF
HtmlDocument.TagAttribute attr = lastSeen.tag.getAttribute(HTML4.HREF_ATTRIBUTE);
// Ignore this tag if it doesn't have a link
if (attr == null) {
return;
}
marker = new URLSpan(attr.getValue());
} else if (HTML4.BLOCKQUOTE_ELEMENT.equals(element)) {
// BLOCKQUOTE
marker = new QuoteSpan();
} else if (HTML4.FONT_ELEMENT.equals(element)) {
// FONT SIZE/COLOR/FACE, since this can insert more than one span
// we special case it and return
handleFont(lastSeen);
}
final int start = lastSeen.startIndex;
final int end = mBuilder.length();
if (marker != null && start != end) {
mBuilder.setSpan(marker, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
/**
* Helper function to handle end font tags
*/
private void handleFont(TagWrapper wrapper) {
final int start = wrapper.startIndex;
final int end = mBuilder.length();
// check font color
HtmlDocument.TagAttribute attr = wrapper.tag.getAttribute(HTML4.COLOR_ATTRIBUTE);
if (attr != null) {
int c = Color.parseColor(attr.getValue());
if (c != -1) {
mBuilder.setSpan(new ForegroundColorSpan(c | 0xFF000000), start, end,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
// check font size
attr = wrapper.tag.getAttribute(HTML4.SIZE_ATTRIBUTE);
if (attr != null) {
int i = Integer.parseInt(attr.getValue());
if (i != -1) {
mBuilder.setSpan(new AbsoluteSizeSpan(i * WEB_TO_ANDROID_SIZE_MULTIPLIER,
true /* use dip */), start, end,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
// check font typeface
attr = wrapper.tag.getAttribute(HTML4.FACE_ATTRIBUTE);
if (attr != null) {
String[] families = attr.getValue().split(",");
for (String family : families) {
mBuilder.setSpan(new TypefaceSpan(family.trim()), start, end,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
}
@Override
public int getPlainTextLength() {
return mBuilder.length();
}
@Override
public Spanned getObject() {
return mBuilder;
}
private static class TagWrapper {
final HtmlDocument.Tag tag;
final int startIndex;
TagWrapper(HtmlDocument.Tag tag, int startIndex) {
this.tag = tag;
this.startIndex = startIndex;
}
}
}
}
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