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package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2020 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.drawable.Drawable;
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import android.net.Uri;
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import android.os.Build;
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import android.text.Html;
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import android.text.SpannableStringBuilder;
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import android.text.Spanned;
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import android.text.TextUtils;
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import android.text.style.ForegroundColorSpan;
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import android.util.Base64;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.core.content.ContextCompat;
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import androidx.core.text.HtmlCompat;
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import androidx.core.util.PatternsCompat;
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import androidx.preference.PreferenceManager;
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import org.jsoup.nodes.Attribute;
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import org.jsoup.nodes.Document;
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import org.jsoup.nodes.Element;
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import org.jsoup.nodes.Node;
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import org.jsoup.nodes.TextNode;
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import org.jsoup.safety.Cleaner;
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import org.jsoup.safety.Whitelist;
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import org.jsoup.select.NodeTraversor;
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import org.jsoup.select.NodeVisitor;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.Locale;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import static androidx.core.text.HtmlCompat.FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM;
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import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE;
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public class HtmlHelper {
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private static final int PREVIEW_SIZE = 500; // characters
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private static final float MIN_LUMINANCE = 0.5f;
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private static final int TAB_SIZE = 2;
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private static final int MAX_AUTO_LINK = 250;
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private static final int TRACKING_PIXEL_SURFACE = 25; // pixels
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private static final List<String> heads = Collections.unmodifiableList(Arrays.asList(
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"h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "table", "br", "hr"));
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private static final List<String> tails = Collections.unmodifiableList(Arrays.asList(
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"h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "li"));
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static Document sanitize(Context context, String html, boolean show_images, boolean autolink) {
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try {
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return _sanitize(context, html, show_images, autolink);
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} catch (Throwable ex) {
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// OutOfMemoryError
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Log.e(ex);
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Document document = Document.createShell("");
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Element strong = document.createElement("strong");
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strong.text(Log.formatThrowable(ex));
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document.body().appendChild(strong);
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return document;
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}
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}
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private static Document _sanitize(Context context, String html, boolean show_images, boolean autolink) {
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
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boolean text_color = prefs.getBoolean("text_color", true);
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boolean display_hidden = prefs.getBoolean("display_hidden", false);
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boolean disable_tracking = prefs.getBoolean("disable_tracking", true);
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Document parsed = JsoupEx.parse(html);
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// <html xmlns:v="urn:schemas-microsoft-com:vml"
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// xmlns:o="urn:schemas-microsoft-com:office:office"
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// xmlns:w="urn:schemas-microsoft-com:office:word"
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// xmlns:m="http://schemas.microsoft.com/office/2004/12/omml"
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// xmlns="http://www.w3.org/TR/REC-html40">
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// <o:p> </o:p></span>
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// Default XHTML namespace: http://www.w3.org/1999/xhtml
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String ns = null;
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for (Element h : parsed.select("html"))
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for (Attribute a : h.attributes()) {
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String key = a.getKey();
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String value = a.getValue();
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if (value != null &&
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key.startsWith("xmlns:") &&
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value.startsWith("http://www.w3.org/")) {
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ns = key.split(":")[1];
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break;
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}
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}
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for (Element e : parsed.select("*")) {
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String tag = e.tagName();
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if (tag.contains(":")) {
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if (ns != null && tag.startsWith(ns)) {
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e.tagName(tag.split(":")[1]);
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Log.i("Updated tag=" + tag + " to=" + e.tagName());
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} else {
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e.remove();
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Log.i("Removed tag=" + tag);
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}
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}
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}
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Whitelist whitelist = Whitelist.relaxed()
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.addTags("hr", "abbr", "big", "font")
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.removeTags("col", "colgroup", "thead", "tbody")
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.removeAttributes("table", "width")
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.removeAttributes("td", "colspan", "rowspan", "width")
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.removeAttributes("th", "colspan", "rowspan", "width")
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.addProtocols("img", "src", "cid")
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.addProtocols("img", "src", "data");
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if (text_color)
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whitelist
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.addAttributes(":all", "style")
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.addAttributes("font", "color");
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final Document document = new Cleaner(whitelist).clean(parsed);
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boolean dark = Helper.isDarkTheme(context);
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// Font
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for (Element font : document.select("font")) {
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String color = font.attr("color");
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
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font.removeAttr("color");
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font.removeAttr("face");
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font.attr("style", "color:" + color + ";");
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font.tagName("span");
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}
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// Sanitize styles
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for (Element element : document.select("*")) {
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String style = element.attr("style");
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if (!TextUtils.isEmpty(style)) {
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StringBuilder sb = new StringBuilder();
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String[] params = style.split(";");
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for (String param : params) {
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String[] kv = param.split(":");
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if (kv.length == 2) {
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String key = kv[0].trim().toLowerCase(Locale.ROOT);
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String value = kv[1].toLowerCase(Locale.ROOT)
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.replaceAll("\\s", "");
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switch (key) {
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case "color":
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String c = value
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.replace("none", "")
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.replace("inherit", "")
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.replace("initial", "")
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.replace("windowtext", "")
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.replace("transparent", "")
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.replace("!important", "");
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Integer color = null;
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try {
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if (TextUtils.isEmpty(c))
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; // Do nothing
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else if (c.startsWith("#"))
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color = Integer.decode(c) | 0xFF000000;
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else if (c.startsWith("rgb")) {
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int s = c.indexOf("(");
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int e = c.indexOf(")");
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if (s > 0 && e > s) {
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String[] rgb = c.substring(s + 1, e).split(",");
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if (rgb.length == 3)
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color = Color.rgb(
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Integer.parseInt(rgb[0]),
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Integer.parseInt(rgb[1]),
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Integer.parseInt(rgb[2])
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);
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}
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} else if (c.equals("orange"))
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color = 0Xffa500; // CSS Level 2
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else
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try {
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color = Color.parseColor(c);
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} catch (IllegalArgumentException ex) {
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color = Color.parseColor("#" + c);
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}
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} catch (Throwable ex) {
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Log.e("Color=" + c);
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}
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if (color != null && !(dark && color == Color.BLACK)) {
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color = Helper.adjustLuminance(color, dark, MIN_LUMINANCE);
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c = String.format("#%06x", color & 0xFFFFFF);
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sb.append("color:").append(c).append(";");
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if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N)
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element.attr("color", c);
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}
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break;
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case "background":
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case "background-color":
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break;
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case "line-through":
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sb.append(param).append(";");
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break;
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case "display":
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if (!display_hidden && "none".equals(value)) {
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Log.i("Removing element " + element.tagName());
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element.empty();
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}
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if ("inline".equals(value) || "inline-block".equals(value))
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element.attr("inline", "true");
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break;
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case "height":
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case "width":
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//case "font-size":
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//case "line-height":
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if (!display_hidden &&
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("0".equals(value) || "0px".equals(value))) {
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Log.i("Removing element " + element.tagName());
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element.empty();
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}
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break;
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}
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}
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}
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if (sb.length() == 0)
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element.removeAttr("style");
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else
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element.attr("style", sb.toString());
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}
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}
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// Remove new lines without surrounding content
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//for (Element br : document.select("br"))
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// if (br.parent() != null && !hasVisibleContent(br.parent().childNodes()))
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// br.tagName("span");
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for (Element div : document.select("div"))
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if (div.children().select("div").size() == 0 &&
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hasVisibleContent(div.childNodes())) {
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Node last = div.childNode(div.childNodeSize() - 1);
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if (last != null && "br".equals(last.nodeName()))
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last.remove();
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}
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// Paragraphs
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for (Element p : document.select("p")) {
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p.appendElement("br");
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p.tagName("div");
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}
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// Short quotes
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for (Element q : document.select("q")) {
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q.prependText("\"");
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q.appendText("\"");
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q.tagName("em");
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}
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// Pre formatted text
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for (Element pre : document.select("pre")) {
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pre.html(formatPre(pre.wholeText()));
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pre.tagName("tt");
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}
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// Code
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document.select("code").tagName("strong");
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// Lines
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for (Element hr : document.select("hr")) {
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hr.tagName("div");
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hr.text("----------------------------------------");
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}
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// Descriptions
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document.select("dl").tagName("div");
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for (Element dt : document.select("dt")) {
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dt.tagName("strong");
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dt.appendElement("br");
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}
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for (Element dd : document.select("dd")) {
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dd.tagName("em");
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dd.appendElement("br").appendElement("br");
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}
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// Abbreviations
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document.select("abbr").tagName("u");
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// Subscript/Superscript
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for (Element subp : document.select("sub,sup")) {
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Element small = document.createElement("small");
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small.html(subp.html());
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subp.html(small.outerHtml());
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}
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// Lists
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for (Element li : document.select("li")) {
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li.tagName("span");
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li.prependText("* ");
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li.appendElement("br"); // line break after list item
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}
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document.select("ol").tagName("div");
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document.select("ul").tagName("div");
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// Tables
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for (Element col : document.select("th,td")) {
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// separate columns
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if (hasVisibleContent(col.childNodes()))
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if (col.nextElementSibling() != null)
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col.appendText(" ");
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if ("th".equals(col.tagName()))
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col.tagName("strong");
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else
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col.tagName("span");
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}
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for (Element row : document.select("tr")) {
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row.tagName("span");
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if (hasVisibleContent(row.childNodes())) {
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Element next = row.nextElementSibling();
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if (next != null && "tr".equals(next.tagName()))
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row.appendElement("br");
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}
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}
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document.select("caption").tagName("div");
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for (Element table : document.select("table"))
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if (table.parent() != null && "a".equals(table.parent().tagName()))
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table.tagName("span"); // Links cannot contain tables
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else
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table.tagName("div");
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// Remove tracking pixels
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if (disable_tracking)
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removeTrackingPixels(context, document);
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// Images
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for (Element img : document.select("img")) {
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String alt = img.attr("alt");
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String src = img.attr("src");
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String tracking = img.attr("tracking");
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if (!show_images && !TextUtils.isEmpty(alt))
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if (TextUtils.isEmpty(tracking))
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img.appendText(" " + alt + " ");
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else {
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img.append(" ");
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Element a = document.createElement("a");
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a.attr("href", tracking);
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a.text(alt);
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img.appendChild(a);
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img.appendText(" ");
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}
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// Annotate source with width and height
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if (!TextUtils.isEmpty(src)) {
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int width = 0;
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int height = 0;
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String awidth = img.attr("width");
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for (int i = 0; i < awidth.length(); i++)
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if (Character.isDigit(awidth.charAt(i)))
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width = width * 10 + (byte) awidth.charAt(i) - (byte) '0';
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else
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break;
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String aheight = img.attr("height");
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for (int i = 0; i < aheight.length(); i++)
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if (Character.isDigit(aheight.charAt(i)))
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height = height * 10 + (byte) aheight.charAt(i) - (byte) '0';
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else
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break;
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if (width != 0 || height != 0) {
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ImageHelper.AnnotatedSource a = new ImageHelper.AnnotatedSource(
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src, width, height, !TextUtils.isEmpty(tracking));
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img.attr("src", a.getAnnotated());
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}
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}
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}
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// Autolink
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if (autolink) {
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final Pattern pattern = Pattern.compile(
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PatternsCompat.AUTOLINK_EMAIL_ADDRESS.pattern() + "|" +
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PatternsCompat.AUTOLINK_WEB_URL.pattern());
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NodeTraversor.traverse(new NodeVisitor() {
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private int links = 0;
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@Override
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public void head(Node node, int depth) {
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if (links < MAX_AUTO_LINK && node instanceof TextNode) {
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TextNode tnode = (TextNode) node;
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String text = tnode.getWholeText();
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Matcher matcher = pattern.matcher(text);
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if (matcher.find()) {
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Element span = document.createElement("span");
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int pos = 0;
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do {
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boolean linked = false;
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Node parent = tnode.parent();
|
|
|
while (parent != null) {
|
|
|
if ("a".equals(parent.nodeName())) {
|
|
|
linked = true;
|
|
|
break;
|
|
|
}
|
|
|
parent = parent.parent();
|
|
|
}
|
|
|
|
|
|
boolean email = matcher.group().contains("@") && !matcher.group().contains(":");
|
|
|
Log.d("Web url=" + matcher.group() +
|
|
|
" " + matcher.start() + "..." + matcher.end() + "/" + text.length() +
|
|
|
" linked=" + linked + " email=" + email + " count=" + links);
|
|
|
|
|
|
if (linked)
|
|
|
span.appendText(text.substring(pos, matcher.end()));
|
|
|
else {
|
|
|
span.appendText(text.substring(pos, matcher.start()));
|
|
|
|
|
|
Element a = document.createElement("a");
|
|
|
a.attr("href", (email ? "mailto:" : "") + matcher.group());
|
|
|
a.text(matcher.group());
|
|
|
span.appendChild(a);
|
|
|
|
|
|
links++;
|
|
|
}
|
|
|
|
|
|
pos = matcher.end();
|
|
|
} while (links < MAX_AUTO_LINK && matcher.find());
|
|
|
|
|
|
span.appendText(text.substring(pos));
|
|
|
|
|
|
tnode.before(span);
|
|
|
tnode.text("");
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
@Override
|
|
|
public void tail(Node node, int depth) {
|
|
|
}
|
|
|
}, document);
|
|
|
}
|
|
|
|
|
|
// Selective new lines
|
|
|
for (Element div : document.select("div"))
|
|
|
if (!Boolean.parseBoolean(div.attr("inline")) &&
|
|
|
div.children().select("div").size() == 0 &&
|
|
|
hasVisibleContent(div.childNodes())) {
|
|
|
div.appendElement("br");
|
|
|
}
|
|
|
|
|
|
for (Element div : document.select("div"))
|
|
|
div.tagName("span");
|
|
|
|
|
|
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N)
|
|
|
for (Element span : document.select("span"))
|
|
|
if (!TextUtils.isEmpty(span.attr("color")))
|
|
|
span.tagName("font");
|
|
|
|
|
|
if (document.body() == null) {
|
|
|
Log.e("Sanitize without body");
|
|
|
document.normalise();
|
|
|
}
|
|
|
|
|
|
return document;
|
|
|
}
|
|
|
|
|
|
private static boolean hasVisibleContent(List<Node> nodes) {
|
|
|
for (Node node : nodes)
|
|
|
if (node instanceof TextNode && !((TextNode) node).isBlank())
|
|
|
return true;
|
|
|
else if (node instanceof Element) {
|
|
|
Element element = (Element) node;
|
|
|
if (!element.isBlock() &&
|
|
|
(element.hasText() || element.selectFirst("img") != null))
|
|
|
return true;
|
|
|
}
|
|
|
return false;
|
|
|
}
|
|
|
|
|
|
static String formatPre(String text) {
|
|
|
int level = 0;
|
|
|
StringBuilder sb = new StringBuilder();
|
|
|
String[] lines = text.split("\\r?\\n");
|
|
|
for (String line : lines) {
|
|
|
// Opening quotes
|
|
|
int tlevel = 0;
|
|
|
while (line.startsWith(">")) {
|
|
|
tlevel++;
|
|
|
if (tlevel > level)
|
|
|
sb.append("<blockquote>");
|
|
|
|
|
|
line = line.substring(1); // >
|
|
|
|
|
|
if (line.startsWith(" "))
|
|
|
line = line.substring(1);
|
|
|
}
|
|
|
|
|
|
// Closing quotes
|
|
|
for (int i = 0; i < level - tlevel; i++)
|
|
|
sb.append("</blockquote>");
|
|
|
level = tlevel;
|
|
|
|
|
|
// Tabs characters
|
|
|
StringBuilder l = new StringBuilder();
|
|
|
for (int j = 0; j < line.length(); j++) {
|
|
|
char kar = line.charAt(j);
|
|
|
if (kar == '\t') {
|
|
|
l.append(' ');
|
|
|
while (l.length() % TAB_SIZE != 0)
|
|
|
l.append(' ');
|
|
|
} else
|
|
|
l.append(kar);
|
|
|
}
|
|
|
line = l.toString();
|
|
|
|
|
|
// Html characters
|
|
|
line = Html.escapeHtml(line);
|
|
|
|
|
|
// Space characters
|
|
|
int len = line.length();
|
|
|
for (int j = 0; j < len; j++) {
|
|
|
char kar = line.charAt(j);
|
|
|
if (kar == ' ') {
|
|
|
// Prevent trimming start
|
|
|
// Keep one space for word wrapping
|
|
|
if (j == 0 || (j + 1 < len && line.charAt(j + 1) == ' '))
|
|
|
sb.append(" ");
|
|
|
else
|
|
|
sb.append(' ');
|
|
|
} else
|
|
|
sb.append(kar);
|
|
|
}
|
|
|
|
|
|
sb.append("<br>");
|
|
|
}
|
|
|
|
|
|
// Closing quotes
|
|
|
for (int i = 0; i < level; i++)
|
|
|
sb.append("</blockquote>");
|
|
|
|
|
|
return sb.toString();
|
|
|
}
|
|
|
|
|
|
static void removeTrackingPixels(Context context, Document document) {
|
|
|
Drawable d = ContextCompat.getDrawable(context, R.drawable.baseline_my_location_24);
|
|
|
d.setTint(Helper.resolveColor(context, R.attr.colorWarning));
|
|
|
|
|
|
Bitmap bm = Bitmap.createBitmap(d.getIntrinsicWidth(), d.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
|
|
|
Canvas c = new Canvas(bm);
|
|
|
d.setBounds(0, 0, c.getWidth(), c.getHeight());
|
|
|
d.draw(c);
|
|
|
|
|
|
ByteArrayOutputStream bos = new ByteArrayOutputStream();
|
|
|
bm.compress(Bitmap.CompressFormat.PNG, 100, bos);
|
|
|
|
|
|
StringBuilder sb = new StringBuilder();
|
|
|
sb.append("data:image/png;base64,");
|
|
|
sb.append(Base64.encodeToString(bos.toByteArray(), Base64.NO_WRAP));
|
|
|
|
|
|
// Build list of allowed hosts
|
|
|
List<String> hosts = new ArrayList<>();
|
|
|
for (Element img : document.select("img")) {
|
|
|
String src = img.attr("src");
|
|
|
if (!TextUtils.isEmpty(src) && !isTrackingPixel(img)) {
|
|
|
Uri uri = Uri.parse(img.attr("src"));
|
|
|
String host = uri.getHost();
|
|
|
if (host != null && !hosts.contains(host))
|
|
|
hosts.add(host);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Images
|
|
|
for (Element img : document.select("img")) {
|
|
|
img.removeAttr("tracking");
|
|
|
String src = img.attr("src");
|
|
|
if (!TextUtils.isEmpty(src) && isTrackingPixel(img)) {
|
|
|
Uri uri = Uri.parse(src);
|
|
|
String host = uri.getHost();
|
|
|
if (host == null || !hosts.contains(host)) {
|
|
|
img.attr("src", sb.toString());
|
|
|
img.attr("alt", context.getString(R.string.title_legend_tracking_pixel));
|
|
|
img.attr("height", "24");
|
|
|
img.attr("width", "24");
|
|
|
img.attr("style", "display:block !important; width:24px !important; height:24px !important;");
|
|
|
img.attr("tracking", src);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
private static boolean isTrackingPixel(Element img) {
|
|
|
String width = img.attr("width").trim();
|
|
|
String height = img.attr("height").trim();
|
|
|
|
|
|
if (TextUtils.isEmpty(width) || TextUtils.isEmpty(height))
|
|
|
return false;
|
|
|
|
|
|
try {
|
|
|
return (Integer.parseInt(width) * Integer.parseInt(height) <= TRACKING_PIXEL_SURFACE);
|
|
|
} catch (NumberFormatException ignored) {
|
|
|
return false;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
static void embedInlineImages(Context context, long id, Document document) throws IOException {
|
|
|
DB db = DB.getInstance(context);
|
|
|
for (Element img : document.select("img")) {
|
|
|
String src = img.attr("src");
|
|
|
if (src.startsWith("cid:")) {
|
|
|
String cid = '<' + src.substring(4) + '>';
|
|
|
EntityAttachment attachment = db.attachment().getAttachment(id, cid);
|
|
|
if (attachment != null && attachment.available) {
|
|
|
File file = attachment.getFile(context);
|
|
|
try (InputStream is = new FileInputStream(file)) {
|
|
|
byte[] bytes = new byte[(int) file.length()];
|
|
|
if (is.read(bytes) != bytes.length)
|
|
|
throw new IOException("length");
|
|
|
|
|
|
StringBuilder sb = new StringBuilder();
|
|
|
sb.append("data:");
|
|
|
sb.append(attachment.type);
|
|
|
sb.append(";base64,");
|
|
|
sb.append(Base64.encodeToString(bytes, Base64.NO_WRAP));
|
|
|
|
|
|
img.attr("src", sb.toString());
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
static void setViewport(Document document) {
|
|
|
// https://developer.mozilla.org/en-US/docs/Mozilla/Mobile/Viewport_meta_tag
|
|
|
document.head().select("meta").select("[name=viewport]").remove();
|
|
|
|
|
|
document.head().prependChild(document.createElement("meta")
|
|
|
.attr("name", "viewport")
|
|
|
.attr("content", "width=device-width, initial-scale=1.0"));
|
|
|
|
|
|
Log.i(document.head().html());
|
|
|
}
|
|
|
|
|
|
static String getPreview(String body) {
|
|
|
try {
|
|
|
return _getPreview(body);
|
|
|
} catch (OutOfMemoryError ex) {
|
|
|
Log.e(ex);
|
|
|
return null;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
private static String _getPreview(String body) {
|
|
|
if (body == null)
|
|
|
return null;
|
|
|
|
|
|
String text = JsoupEx.parse(body).text();
|
|
|
|
|
|
String preview = text.substring(0, Math.min(text.length(), PREVIEW_SIZE));
|
|
|
if (preview.length() < text.length())
|
|
|
preview += "…";
|
|
|
|
|
|
return preview;
|
|
|
}
|
|
|
|
|
|
static String getText(String html) {
|
|
|
final StringBuilder sb = new StringBuilder();
|
|
|
|
|
|
html = html.replace("<br> ", "<br>");
|
|
|
|
|
|
NodeTraversor.traverse(new NodeVisitor() {
|
|
|
private int qlevel = 0;
|
|
|
private int tlevel = 0;
|
|
|
private int plevel = 0;
|
|
|
private int lindex = 0;
|
|
|
|
|
|
public void head(Node node, int depth) {
|
|
|
if (node instanceof TextNode)
|
|
|
if (plevel > 0) {
|
|
|
String[] lines = ((TextNode) node).getWholeText().split("\\r?\\n");
|
|
|
for (String line : lines) {
|
|
|
append(line, true);
|
|
|
newline();
|
|
|
}
|
|
|
} else
|
|
|
append(((TextNode) node).text());
|
|
|
else {
|
|
|
String name = node.nodeName();
|
|
|
if ("li".equals(name))
|
|
|
append("*");
|
|
|
else if ("blockquote".equals(name))
|
|
|
qlevel++;
|
|
|
else if ("pre".equals(name))
|
|
|
plevel++;
|
|
|
|
|
|
if (heads.contains(name))
|
|
|
newline();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
public void tail(Node node, int depth) {
|
|
|
String name = node.nodeName();
|
|
|
if ("a".equals(name))
|
|
|
append("[" + node.attr("href") + "]");
|
|
|
else if ("img".equals(name))
|
|
|
append("[" + node.attr("src") + "]");
|
|
|
else if ("th".equals(name) || "td".equals(name)) {
|
|
|
Node next = node.nextSibling();
|
|
|
if (next == null || !("th".equals(next.nodeName()) || "td".equals(next.nodeName())))
|
|
|
newline();
|
|
|
else
|
|
|
append(" ");
|
|
|
} else if ("blockquote".equals(name))
|
|
|
qlevel--;
|
|
|
else if ("pre".equals(name))
|
|
|
plevel--;
|
|
|
|
|
|
if (tails.contains(name))
|
|
|
newline();
|
|
|
}
|
|
|
|
|
|
private void append(String text) {
|
|
|
append(text, false);
|
|
|
}
|
|
|
|
|
|
private void append(String text, boolean raw) {
|
|
|
if (tlevel != qlevel) {
|
|
|
newline();
|
|
|
tlevel = qlevel;
|
|
|
}
|
|
|
|
|
|
if (!raw && !"-- ".equals(text)) {
|
|
|
text = text.trim();
|
|
|
if (lindex > 0)
|
|
|
text = " " + text;
|
|
|
}
|
|
|
|
|
|
sb.append(text);
|
|
|
lindex += text.length();
|
|
|
}
|
|
|
|
|
|
private void newline() {
|
|
|
lindex = 0;
|
|
|
sb.append("\n");
|
|
|
|
|
|
for (int i = 0; i < qlevel; i++)
|
|
|
sb.append("> ");
|
|
|
}
|
|
|
}, JsoupEx.parse(html));
|
|
|
|
|
|
sb.append("\n");
|
|
|
|
|
|
return sb.toString();
|
|
|
}
|
|
|
|
|
|
static Spanned highlightHeaders(Context context, String headers) {
|
|
|
int colorAccent = Helper.resolveColor(context, R.attr.colorAccent);
|
|
|
SpannableStringBuilder ssb = new SpannableStringBuilder(headers);
|
|
|
int index = 0;
|
|
|
for (String line : headers.split("\n")) {
|
|
|
if (line.length() > 0 && !Character.isWhitespace(line.charAt(0))) {
|
|
|
int colon = line.indexOf(':');
|
|
|
if (colon > 0)
|
|
|
ssb.setSpan(new ForegroundColorSpan(colorAccent), index, index + colon, 0);
|
|
|
}
|
|
|
index += line.length() + 1;
|
|
|
}
|
|
|
return ssb;
|
|
|
}
|
|
|
|
|
|
static Spanned fromHtml(@NonNull String html) {
|
|
|
return fromHtml(html, null, null);
|
|
|
}
|
|
|
|
|
|
static Spanned fromHtml(@NonNull String html, @Nullable Html.ImageGetter imageGetter, @Nullable Html.TagHandler tagHandler) {
|
|
|
Spanned spanned = HtmlCompat.fromHtml(html, FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM, imageGetter, tagHandler);
|
|
|
|
|
|
int i = spanned.length();
|
|
|
while (i > 1 && spanned.charAt(i - 2) == '\n' && spanned.charAt(i - 1) == '\n')
|
|
|
i--;
|
|
|
if (i != spanned.length())
|
|
|
spanned = (Spanned) spanned.subSequence(0, i);
|
|
|
|
|
|
return spanned;
|
|
|
}
|
|
|
|
|
|
static String toHtml(Spanned spanned) {
|
|
|
String html = HtmlCompat.toHtml(spanned, TO_HTML_PARAGRAPH_LINES_CONSECUTIVE);
|
|
|
|
|
|
// @Google: why convert size to and from in a different way?
|
|
|
Document doc = JsoupEx.parse(html);
|
|
|
for (Element element : doc.select("span")) {
|
|
|
String style = element.attr("style");
|
|
|
if (style.startsWith("font-size:")) {
|
|
|
int colon = style.indexOf(':');
|
|
|
int semi = style.indexOf("em;", colon);
|
|
|
if (semi > colon)
|
|
|
try {
|
|
|
String hsize = style.substring(colon + 1, semi).replace(',', '.');
|
|
|
float size = Float.parseFloat(hsize);
|
|
|
element.tagName(size < 1.0f ? "small" : "big");
|
|
|
element.attributes().remove("style");
|
|
|
} catch (NumberFormatException ex) {
|
|
|
Log.e(ex);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return doc.html();
|
|
|
}
|
|
|
}
|
