mirror of https://github.com/M66B/FairEmail.git
M66B
5 years ago
parent
4a01c00f4e
commit
e4958c0874
@ -0,0 +1,479 @@
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package eu.faircode.email;
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import android.content.Context;
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import android.graphics.Typeface;
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import android.text.Layout;
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import android.text.Spanned;
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import android.text.TextDirectionHeuristics;
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import android.text.TextUtils;
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import android.text.style.AbsoluteSizeSpan;
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import android.text.style.AlignmentSpan;
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import android.text.style.BackgroundColorSpan;
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import android.text.style.BulletSpan;
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import android.text.style.CharacterStyle;
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import android.text.style.ForegroundColorSpan;
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import android.text.style.ImageSpan;
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import android.text.style.ParagraphStyle;
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import android.text.style.QuoteSpan;
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import android.text.style.RelativeSizeSpan;
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import android.text.style.StrikethroughSpan;
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import android.text.style.StyleSpan;
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import android.text.style.SubscriptSpan;
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import android.text.style.SuperscriptSpan;
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import android.text.style.TypefaceSpan;
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import android.text.style.URLSpan;
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import android.text.style.UnderlineSpan;
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import static android.text.Html.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE;
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public class HtmlEx {
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private Context context;
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private static final int TO_HTML_PARAGRAPH_FLAG = 0x00000001;
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public HtmlEx(Context context){
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this.context = context;
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}
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/**
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* @deprecated use {@link #toHtml(Spanned, int)} instead.
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*/
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@Deprecated
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public /* static */ String toHtml(Spanned text) {
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return toHtml(text, TO_HTML_PARAGRAPH_LINES_CONSECUTIVE);
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}
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/**
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* Returns an HTML representation of the provided Spanned text. A best effort is
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* made to add HTML tags corresponding to spans. Also note that HTML metacharacters
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* (such as "<" and "&") within the input text are escaped.
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*
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* @param text input text to convert
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* @param option one of {@link #TO_HTML_PARAGRAPH_LINES_CONSECUTIVE} or
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* {@link #TO_HTML_PARAGRAPH_LINES_INDIVIDUAL}
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* @return string containing input converted to HTML
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*/
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public /* static */ String toHtml(Spanned text, int option) {
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StringBuilder out = new StringBuilder();
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withinHtml(out, text, option);
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return out.toString();
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}
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/**
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* Returns an HTML escaped representation of the given plain text.
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*/
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public /* static */ String escapeHtml(CharSequence text) {
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StringBuilder out = new StringBuilder();
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withinStyle(out, text, 0, text.length());
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return out.toString();
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}
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private /* static */ void withinHtml(StringBuilder out, Spanned text, int option) {
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if ((option & TO_HTML_PARAGRAPH_FLAG) == TO_HTML_PARAGRAPH_LINES_CONSECUTIVE) {
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encodeTextAlignmentByDiv(out, text, option);
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return;
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}
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withinDiv(out, text, 0, text.length(), option);
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}
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private /* static */ void encodeTextAlignmentByDiv(StringBuilder out, Spanned text, int option) {
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int len = text.length();
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int next;
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for (int i = 0; i < len; i = next) {
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next = text.nextSpanTransition(i, len, ParagraphStyle.class);
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ParagraphStyle[] style = text.getSpans(i, next, ParagraphStyle.class);
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String elements = " ";
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boolean needDiv = false;
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for(int j = 0; j < style.length; j++) {
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if (style[j] instanceof AlignmentSpan) {
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Layout.Alignment align =
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((AlignmentSpan) style[j]).getAlignment();
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needDiv = true;
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if (align == Layout.Alignment.ALIGN_CENTER) {
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elements = "align=\"center\" " + elements;
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} else if (align == Layout.Alignment.ALIGN_OPPOSITE) {
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elements = "align=\"right\" " + elements;
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} else {
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elements = "align=\"left\" " + elements;
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}
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}
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}
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if (needDiv) {
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out.append("<div ").append(elements).append(">");
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}
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withinDiv(out, text, i, next, option);
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if (needDiv) {
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out.append("</div>");
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}
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}
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}
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private /* static */ void withinDiv(StringBuilder out, Spanned text, int start, int end,
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int option) {
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int next;
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for (int i = start; i < end; i = next) {
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next = text.nextSpanTransition(i, end, QuoteSpan.class);
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QuoteSpan[] quotes = text.getSpans(i, next, QuoteSpan.class);
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for (QuoteSpan quote : quotes) {
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out.append("<blockquote>");
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}
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withinBlockquote(out, text, i, next, option);
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for (QuoteSpan quote : quotes) {
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out.append("</blockquote>\n");
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}
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}
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}
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private /* static */ String getTextDirection(Spanned text, int start, int end) {
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if (TextDirectionHeuristics.FIRSTSTRONG_LTR.isRtl(text, start, end - start)) {
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return " dir=\"rtl\"";
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} else {
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return " dir=\"ltr\"";
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}
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}
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private /* static */ String getTextStyles(Spanned text, int start, int end,
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boolean forceNoVerticalMargin, boolean includeTextAlign) {
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String margin = null;
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String textAlign = null;
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if (forceNoVerticalMargin) {
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margin = "margin-top:0; margin-bottom:0;";
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}
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if (includeTextAlign) {
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final AlignmentSpan[] alignmentSpans = text.getSpans(start, end, AlignmentSpan.class);
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// Only use the last AlignmentSpan with flag SPAN_PARAGRAPH
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for (int i = alignmentSpans.length - 1; i >= 0; i--) {
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AlignmentSpan s = alignmentSpans[i];
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if ((text.getSpanFlags(s) & Spanned.SPAN_PARAGRAPH) == Spanned.SPAN_PARAGRAPH) {
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final Layout.Alignment alignment = s.getAlignment();
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if (alignment == Layout.Alignment.ALIGN_NORMAL) {
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textAlign = "text-align:start;";
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} else if (alignment == Layout.Alignment.ALIGN_CENTER) {
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textAlign = "text-align:center;";
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} else if (alignment == Layout.Alignment.ALIGN_OPPOSITE) {
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textAlign = "text-align:end;";
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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 (margin == null && textAlign == null) {
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return "";
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}
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final StringBuilder style = new StringBuilder(" style=\"");
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if (margin != null && textAlign != null) {
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style.append(margin).append(" ").append(textAlign);
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} else if (margin != null) {
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style.append(margin);
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} else if (textAlign != null) {
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style.append(textAlign);
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}
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return style.append("\"").toString();
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}
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private /* static */ void withinBlockquote(StringBuilder out, Spanned text, int start, int end,
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int option) {
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if ((option & TO_HTML_PARAGRAPH_FLAG) == TO_HTML_PARAGRAPH_LINES_CONSECUTIVE) {
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withinBlockquoteConsecutive(out, text, start, end);
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} else {
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withinBlockquoteIndividual(out, text, start, end);
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}
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}
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private /* static */ void withinBlockquoteIndividual(StringBuilder out, Spanned text, int start,
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int end) {
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boolean isInList = false;
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int next;
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for (int i = start; i <= end; i = next) {
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next = TextUtils.indexOf(text, '\n', i, end);
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if (next < 0) {
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next = end;
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}
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if (next == i) {
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if (isInList) {
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// Current paragraph is no longer a list item; close the previously opened list
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isInList = false;
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out.append("</ul>\n");
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}
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out.append("<br>\n");
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} else {
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boolean isListItem = false;
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ParagraphStyle[] paragraphStyles = text.getSpans(i, next, ParagraphStyle.class);
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for (ParagraphStyle paragraphStyle : paragraphStyles) {
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final int spanFlags = text.getSpanFlags(paragraphStyle);
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if ((spanFlags & Spanned.SPAN_PARAGRAPH) == Spanned.SPAN_PARAGRAPH
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&& paragraphStyle instanceof BulletSpan) {
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isListItem = true;
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break;
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}
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}
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if (isListItem && !isInList) {
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// Current paragraph is the first item in a list
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isInList = true;
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out.append("<ul")
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.append(getTextStyles(text, i, next, true, false))
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.append(">\n");
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}
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if (isInList && !isListItem) {
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// Current paragraph is no longer a list item; close the previously opened list
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isInList = false;
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out.append("</ul>\n");
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}
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String tagType = isListItem ? "li" : "p";
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out.append("<").append(tagType)
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.append(getTextDirection(text, i, next))
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.append(getTextStyles(text, i, next, !isListItem, true))
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.append(">");
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withinParagraph(out, text, i, next);
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out.append("</");
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out.append(tagType);
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out.append(">\n");
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if (next == end && isInList) {
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isInList = false;
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out.append("</ul>\n");
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}
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}
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next++;
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}
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}
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private /* static */ void withinBlockquoteConsecutive(StringBuilder out, Spanned text, int start,
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int end) {
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out.append("<p").append(getTextDirection(text, start, end)).append(">");
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int next;
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for (int i = start; i < end; i = next) {
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next = TextUtils.indexOf(text, '\n', i, end);
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if (next < 0) {
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next = end;
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}
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int nl = 0;
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while (next < end && text.charAt(next) == '\n') {
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nl++;
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next++;
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}
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withinParagraph(out, text, i, next - nl);
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if (nl == 1) {
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out.append("<br>\n");
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} else {
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for (int j = 2; j < nl; j++) {
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out.append("<br>");
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}
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if (next != end) {
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/* Paragraph should be closed and reopened */
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out.append("</p>\n");
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out.append("<p").append(getTextDirection(text, start, end)).append(">");
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}
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}
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}
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out.append("</p>\n");
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}
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private /* static */ void withinParagraph(StringBuilder out, Spanned text, int start, int end) {
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int next;
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for (int i = start; i < end; i = next) {
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next = text.nextSpanTransition(i, end, CharacterStyle.class);
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CharacterStyle[] style = text.getSpans(i, next, CharacterStyle.class);
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for (int j = 0; j < style.length; j++) {
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if (style[j] instanceof StyleSpan) {
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int s = ((StyleSpan) style[j]).getStyle();
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if ((s & Typeface.BOLD) != 0) {
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out.append("<b>");
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}
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if ((s & Typeface.ITALIC) != 0) {
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out.append("<i>");
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}
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}
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if (style[j] instanceof TypefaceSpan) {
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String s = ((TypefaceSpan) style[j]).getFamily();
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//if ("monospace".equals(s)) {
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// out.append("<tt>");
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//}
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out.append("<span style=\"font-family:" + s + ";\">");
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}
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if (style[j] instanceof SuperscriptSpan) {
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out.append("<sup>");
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}
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if (style[j] instanceof SubscriptSpan) {
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out.append("<sub>");
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}
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if (style[j] instanceof UnderlineSpan) {
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out.append("<u>");
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}
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if (style[j] instanceof StrikethroughSpan) {
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out.append("<span style=\"text-decoration:line-through;\">");
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}
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if (style[j] instanceof URLSpan) {
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out.append("<a href=\"");
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out.append(((URLSpan) style[j]).getURL());
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out.append("\">");
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}
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if (style[j] instanceof ImageSpan) {
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out.append("<img src=\"");
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out.append(((ImageSpan) style[j]).getSource());
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out.append("\">");
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// Don't output the dummy character underlying the image.
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i = next;
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}
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if (style[j] instanceof AbsoluteSizeSpan) {
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AbsoluteSizeSpan s = ((AbsoluteSizeSpan) style[j]);
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float sizeDip = s.getSize();
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if (!s.getDip()) {
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//Application application = ActivityThread.currentApplication();
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sizeDip /= context.getResources().getDisplayMetrics().density;
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}
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// px in CSS is the equivalance of dip in Android
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out.append(String.format("<span style=\"font-size:%.0fpx\";>", sizeDip));
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}
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if (style[j] instanceof RelativeSizeSpan) {
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float sizeEm = ((RelativeSizeSpan) style[j]).getSizeChange();
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out.append(String.format("<span style=\"font-size:%.2fem;\">", sizeEm));
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}
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if (style[j] instanceof ForegroundColorSpan) {
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int color = ((ForegroundColorSpan) style[j]).getForegroundColor();
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out.append(String.format("<span style=\"color:#%06X;\">", 0xFFFFFF & color));
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}
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if (style[j] instanceof BackgroundColorSpan) {
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int color = ((BackgroundColorSpan) style[j]).getBackgroundColor();
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out.append(String.format("<span style=\"background-color:#%06X;\">",
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0xFFFFFF & color));
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}
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}
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withinStyle(out, text, i, next);
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for (int j = style.length - 1; j >= 0; j--) {
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if (style[j] instanceof BackgroundColorSpan) {
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out.append("</span>");
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}
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if (style[j] instanceof ForegroundColorSpan) {
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out.append("</span>");
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}
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if (style[j] instanceof RelativeSizeSpan) {
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out.append("</span>");
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}
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if (style[j] instanceof AbsoluteSizeSpan) {
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out.append("</span>");
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}
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if (style[j] instanceof URLSpan) {
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out.append("</a>");
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}
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if (style[j] instanceof StrikethroughSpan) {
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out.append("</span>");
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}
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if (style[j] instanceof UnderlineSpan) {
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out.append("</u>");
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}
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if (style[j] instanceof SubscriptSpan) {
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out.append("</sub>");
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}
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if (style[j] instanceof SuperscriptSpan) {
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out.append("</sup>");
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}
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if (style[j] instanceof TypefaceSpan) {
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//String s = ((TypefaceSpan) style[j]).getFamily();
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//if (s.equals("monospace")) {
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// out.append("</tt>");
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//}
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out.append("</span>");
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}
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if (style[j] instanceof StyleSpan) {
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int s = ((StyleSpan) style[j]).getStyle();
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if ((s & Typeface.BOLD) != 0) {
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out.append("</b>");
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}
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if ((s & Typeface.ITALIC) != 0) {
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out.append("</i>");
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}
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}
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}
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}
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}
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//@UnsupportedAppUsage
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private /* static */ void withinStyle(StringBuilder out, CharSequence text,
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int start, int end) {
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for (int i = start; i < end; i++) {
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char c = text.charAt(i);
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if (c == '<') {
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out.append("<");
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} else if (c == '>') {
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out.append(">");
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} else if (c == '&') {
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out.append("&");
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} else if (c >= 0xD800 && c <= 0xDFFF) {
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if (c < 0xDC00 && i + 1 < end) {
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char d = text.charAt(i + 1);
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if (d >= 0xDC00 && d <= 0xDFFF) {
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i++;
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int codepoint = 0x010000 | (int) c - 0xD800 << 10 | (int) d - 0xDC00;
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out.append("&#").append(codepoint).append(";");
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}
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}
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} else if (c > 0x7E || c < ' ') {
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out.append("&#").append((int) c).append(";");
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} else if (c == ' ') {
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while (i + 1 < end && text.charAt(i + 1) == ' ') {
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out.append(" ");
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i++;
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}
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out.append(' ');
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} else {
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out.append(c);
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}
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}
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}
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}
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