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package com.keylesspalace.tusky.util
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import android.text.Spannable
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import android.text.Spanned
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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.URLSpan
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import java.util.regex.Pattern
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/**
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* @see <a href="https://github.com/tootsuite/mastodon/blob/master/app/models/tag.rb">
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* Tag#HASHTAG_RE</a>.
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*/
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private const val TAG_REGEX = "(?:^|[^/)\\w])#([\\w_]*[\\p{Alpha}_][\\w_]*)"
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/**
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* @see <a href="https://github.com/tootsuite/mastodon/blob/master/app/models/account.rb">
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* Account#MENTION_RE</a>
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*/
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private const val MENTION_REGEX = "(?:^|[^/[:word:]])@([a-z0-9_]+(?:@[a-z0-9\\.\\-]+[a-z0-9]+)?)"
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private const val HTTP_URL_REGEX = "(?:(^|\\b)http://[^\\s]+)"
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private const val HTTPS_URL_REGEX = "(?:(^|\\b)https://[^\\s]+)"
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/**
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* Dump of android.util.Patterns.WEB_URL
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*/
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private val STRICT_WEB_URL_PATTERN = Pattern.compile("(((?:(?i:http|https|rtsp)://(?:(?:[a-zA-Z0-9\\\$\\-\\_\\.\\+\\!\\*\\'\\(\\)\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,64}(?:\\:(?:[a-zA-Z0-9\\\$\\-\\_\\.\\+\\!\\*\\'\\(\\)\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,25})?\\@)?)?(?:(([a-zA-Z0-9[ -\uD7FF豈-\uFDCFﷰ-\uFFEF\uD800\uDC00-\uD83F\uDFFD\uD840\uDC00-\uD87F\uDFFD\uD880\uDC00-\uD8BF\uDFFD\uD8C0\uDC00-\uD8FF\uDFFD\uD900\uDC00-\uD93F\uDFFD\uD940\uDC00-\uD97F\uDFFD\uD980\uDC00-\uD9BF\uDFFD\uD9C0\uDC00-\uD9FF\uDFFD\uDA00\uDC00-\uDA3F\uDFFD\uDA40\uDC00-\uDA7F\uDFFD\uDA80\uDC00-\uDABF\uDFFD\uDAC0\uDC00-\uDAFF\uDFFD\uDB00\uDC00-\uDB3F\uDFFD\uDB44\uDC00-\uDB7F\uDFFD&&[^ [ - ]\u2028\u2029 ]]](?:[a-zA-Z0-9[ -\uD7FF豈-\uFDCFﷰ-\uFFEF\uD800\uDC00-\uD83F\uDFFD\uD840\uDC00-\uD87F\uDFFD\uD880\uDC00-\uD8BF\uDFFD\uD8C0\uDC00-\uD8FF\uDFFD\uD900\uDC00-\uD93F\uDFFD\uD940\uDC00-\uD97F\uDFFD\uD980\uDC00-\uD9BF\uDFFD\uD9C0\uDC00-\uD9FF\uDFFD\uDA00\uDC00-\uDA3F\uDFFD\uDA40\uDC00-\uDA7F\uDFFD\uDA80\uDC00-\uDABF\uDFFD\uDAC0\uDC00-\uDAFF\uDFFD\uDB00\uDC00-\uDB3F\uDFFD\uDB44\uDC00-\uDB7F\uDFFD&&[^ [ - ]\u2028\u2029 ]]_\\-]{0,61}[a-zA-Z0-9[ -\uD7FF豈-\uFDCFﷰ-\uFFEF\uD800\uDC00-\uD83F\uDFFD\uD840\uDC00-\uD87F\uDFFD\uD880\uDC00-\uD8BF\uDFFD\uD8C0\uDC00-\uD8FF\uDFFD\uD900\uDC00-\uD93F\uDFFD\uD940\uDC00-\uD97F\uDFFD\uD980\uDC00-\uD9BF\uDFFD\uD9C0\uDC00-\uD9FF\uDFFD\uDA00\uDC00-\uDA3F\uDFFD\uDA40\uDC00-\uDA7F\uDFFD\uDA80\uDC00-\uDABF\uDFFD\uDAC0\uDC00-\uDAFF\uDFFD\uDB00\uDC00-\uDB3F\uDFFD\uDB44\uDC00-\uDB7F\uDFFD&&[^ [ - ]\u2028\u2029 ]]]){0,1}\\.)+(xn\\-\\-[\\w\\-]{0,58}\\w|[a-zA-Z[ -\uD7FF豈-\uFDCFﷰ-\uFFEF\uD800\uDC00-\uD83F\uDFFD\uD840\uDC00-\uD87F\uDFFD\uD880\uDC00-\uD8BF\uDFFD\uD8C0\uDC00-\uD8FF\uDFFD\uD900\uDC00-\uD93F\uDFFD\uD940\uDC00-\uD97F\uDFFD\uD980\uDC00-\uD9BF\uDFFD\uD9C0\uDC00-\uD9FF\uDFFD\uDA00\uDC00-\uDA3F\uDFFD\uDA40\uDC00-\uDA7F\uDFFD\uDA80\uDC00-\uDABF\uDFFD\uDAC0\uDC00-\uDAFF\uDFFD\uDB00\uDC00-\uDB3F\uDFFD\uDB44\uDC00-\uDB7F\uDFFD&&[^ [ - ]\u2028\u2029 ]]]{2,63})|((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[0-9]))))(?:\\:\\d{1,5})?)([/\\?](?:(?:[a-zA-Z0-9[ -\uD7FF豈-\uFDCFﷰ-\uFFEF\uD800\uDC00-\uD83F\uDFFD\uD840\uDC00-\uD87F\uDFFD\uD880\uDC00-\uD8BF\uDFFD\uD8C0\uDC00-\uD8FF\uDFFD\uD900\uDC00-\uD93F\uDFFD\uD940\uDC00-\uD97F\uDFFD\uD980\uDC00-\uD9BF\uDFFD\uD9C0\uDC00-\uD9FF\uDFFD\uDA00\uDC00-\uDA3F\uDFFD\uDA40\uDC00-\uDA7F\uDFFD\uDA80\uDC00-\uDABF\uDFFD\uDAC0\uDC00-\uDAFF\uDFFD\uDB00\uDC00-\uDB3F\uDFFD\uDB44\uDC00-\uDB7F\uDFFD&&[^ [ - ]\u2028\u2029 ]];/\\?:@&=#~\\-\\.\\+!\\*'\\(\\),_\\\$])|(?:%[a-fA-F0-9]{2}))*)?(?:\\b|\$|^))")
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private val spanClasses = listOf(ForegroundColorSpan::class.java, URLSpan::class.java)
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private val finders = mapOf(
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FoundMatchType.HTTP_URL to PatternFinder(':', HTTP_URL_REGEX, 5),
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FoundMatchType.HTTPS_URL to PatternFinder(':', HTTPS_URL_REGEX, 6),
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FoundMatchType.TAG to PatternFinder('#', TAG_REGEX, 1),
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FoundMatchType.MENTION to PatternFinder('@', MENTION_REGEX, 1)
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)
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private enum class FoundMatchType {
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HTTP_URL,
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HTTPS_URL,
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TAG,
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MENTION,
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}
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private class FindCharsResult {
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lateinit var matchType: FoundMatchType
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var start: Int = -1
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var end: Int = -1
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}
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private class PatternFinder(val searchCharacter: Char, regex: String, val searchPrefixWidth: Int) {
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val pattern: Pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE)
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}
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private fun <T> clearSpans(text: Spannable, spanClass: Class<T>) {
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for(span in text.getSpans(0, text.length, spanClass)) {
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text.removeSpan(span)
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}
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}
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private fun findPattern(string: String, fromIndex: Int): FindCharsResult {
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val result = FindCharsResult()
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for (i in fromIndex..string.lastIndex) {
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val c = string[i]
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for (matchType in FoundMatchType.values()) {
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val finder = finders[matchType]
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if (finder!!.searchCharacter == c
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&& ((i - fromIndex) < finder.searchPrefixWidth ||
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Character.isWhitespace(string.codePointAt(i - finder.searchPrefixWidth)))) {
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result.matchType = matchType
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result.start = Math.max(0, i - finder.searchPrefixWidth)
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findEndOfPattern(string, result, finder.pattern)
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if (result.start + finder.searchPrefixWidth <= i + 1 && // The found result is actually triggered by the correct search character
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result.end >= result.start) { // ...and we actually found a valid result
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return result
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}
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}
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}
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}
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return result
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}
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private fun findEndOfPattern(string: String, result: FindCharsResult, pattern: Pattern) {
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val matcher = pattern.matcher(string)
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if (matcher.find(result.start)) {
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// Once we have API level 26+, we can use named captures...
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val end = matcher.end()
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result.start = matcher.start()
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if (Character.isWhitespace(string.codePointAt(result.start))) {
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++result.start
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}
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when(result.matchType) {
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FoundMatchType.HTTP_URL, FoundMatchType.HTTPS_URL -> {
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// Preliminary url patterns are fast/permissive, now we'll do full validation
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if (STRICT_WEB_URL_PATTERN.matcher(string.substring(result.start, end)).matches()) {
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result.end = end
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}
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}
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else -> result.end = end
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}
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}
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}
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private fun getSpan(matchType: FoundMatchType, string: String, colour: Int, start: Int, end: Int): CharacterStyle {
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return when(matchType) {
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FoundMatchType.HTTP_URL -> CustomURLSpan(string.substring(start, end))
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FoundMatchType.HTTPS_URL -> CustomURLSpan(string.substring(start, end))
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else -> ForegroundColorSpan(colour)
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}
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}
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/** Takes text containing mentions and hashtags and urls and makes them the given colour. */
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fun highlightSpans(text: Spannable, colour: Int) {
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// Strip all existing colour spans.
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for (spanClass in spanClasses) {
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clearSpans(text, spanClass)
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}
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// Colour the mentions and hashtags.
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val string = text.toString()
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val length = text.length
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var start = 0
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var end = 0
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while (end >= 0 && end < length && start >= 0) {
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// Search for url first because it can contain the other characters
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val found = findPattern(string, end)
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start = found.start
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end = found.end
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if (start >= 0 && end > start) {
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text.setSpan(getSpan(found.matchType, string, colour, start, end), start, end, Spanned.SPAN_INCLUSIVE_EXCLUSIVE)
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start += finders[found.matchType]!!.searchPrefixWidth
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}
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}
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}
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