77 lines
2.4 KiB
Java
77 lines
2.4 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui.util;
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import android.content.Context;
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import android.text.Spannable;
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import android.text.style.ForegroundColorSpan;
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import org.sufficientlysecure.keychain.R;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class Highlighter {
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private Context mContext;
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private String mQuery;
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public Highlighter(Context context) {
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mContext = context;
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}
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public void setQuery(String mQuery) {
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this.mQuery = mQuery;
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}
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public Spannable highlight(CharSequence text) {
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Spannable highlight = Spannable.Factory.getInstance().newSpannable(text);
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if (mQuery == null) {
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return highlight;
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}
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String queryPattern = buildPatternFromQuery(mQuery);
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Pattern pattern = Pattern.compile("(" + queryPattern + ")", Pattern.CASE_INSENSITIVE);
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Matcher matcher = pattern.matcher(text);
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int colorEmphasis = FormattingUtils.getColorFromAttr(mContext, R.attr.colorEmphasis);
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while (matcher.find()) {
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highlight.setSpan(new ForegroundColorSpan(colorEmphasis),
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matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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}
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return highlight;
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}
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private static String buildPatternFromQuery(String mQuery) {
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String chunks[] = mQuery.split(" *, *");
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boolean firstChunk = true;
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StringBuilder patternPiece = new StringBuilder();
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for (int i = 0; i < chunks.length; ++i) {
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patternPiece.append(Pattern.quote(chunks[i]));
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if (firstChunk) {
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firstChunk = false;
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continue;
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}
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patternPiece.append('|');
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}
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return patternPiece.toString();
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}
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}
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