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64 lines
2.4 KiB
Java
64 lines
2.4 KiB
Java
package com.fox2code.mmm.markdown;
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import android.util.Log;
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import com.fox2code.mmm.BuildConfig;
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import java.util.ArrayList;
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public class MarkdownUrlLinker {
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private static final String TAG = "MarkdownUrlLinker";
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public static String urlLinkify(String url) {
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int index = url.indexOf("https://");
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if (index == -1) return url;
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ArrayList<LinkifyTask> linkifyTasks = new ArrayList<>();
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int extra = 0;
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while (index != -1) {
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int end = url.indexOf(' ', index);
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end = end == -1 ? url.indexOf('\n', index) :
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Math.min(url.indexOf('\n', index), end);
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if (end == -1) end = url.length();
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if (index == 0 ||
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'\n' == url.charAt(index - 1) ||
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' ' == url.charAt(index - 1)) {
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int endDomain = url.indexOf('/', index + 9);
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char endCh = url.charAt(end - 1);
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if (endDomain != -1 && endDomain < end &&
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endCh != '>' && endCh != ')' && endCh != ']') {
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linkifyTasks.add(new LinkifyTask(index, end));
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extra += (end - index) + 4;
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if (BuildConfig.DEBUG) {
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Log.d(TAG, "Linkify url: " + url.substring(index, end));
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}
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}
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}
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index = url.indexOf("https://", end);
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}
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if (linkifyTasks.isEmpty()) return url;
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LinkifyTask prev = LinkifyTask.NULL;
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StringBuilder stringBuilder = new StringBuilder(url.length() + extra);
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for (LinkifyTask linkifyTask : linkifyTasks) {
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stringBuilder.append(url, prev.end, linkifyTask.start)
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.append('[').append(url, linkifyTask.start, linkifyTask.end)
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.append("](").append(url, linkifyTask.start, linkifyTask.end).append(')');
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prev = linkifyTask;
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}
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if (prev.end != url.length()) stringBuilder.append(url, prev.end, url.length());
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Log.d(TAG, "Added Markdown link to " + linkifyTasks.size() + " urls");
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return stringBuilder.toString();
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}
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private static class LinkifyTask {
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static final LinkifyTask NULL = new LinkifyTask(0, 0);
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private final int start;
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private final int end;
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private LinkifyTask(int start, int end) {
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this.start = start;
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this.end = end;
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}
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}
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}
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