chinwag/chinwag-android
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Fix tag highlighting in editor (#1773)

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* Fix tag highlighting in editor

* Add test case for tag highlighting
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kyori19 2020-05-09 02:16:35 +09:00 • committed by GitHub
commit 23a1701151
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2 changed files with 70 additions and 12 deletions
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46
app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt
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@ -12,7 +12,7 @@ import kotlin.math.max
* @see <a href="https://github.com/tootsuite/mastodon/blob/master/app/models/tag.rb">
* Tag#HASHTAG_RE</a>.
*/
private const val TAG_REGEX = "(?:^|[^/)\\w])#([\\w_]*[\\p{Alpha}_][\\w_]*)"
private const val TAG_REGEX = "(?:^|[^/)A-Za-z0-9_])#([\\w_]*[\\p{Alpha}_][\\w_]*)"
/**
* @see <a href="https://github.com/tootsuite/mastodon/blob/master/app/models/account.rb">
@ -30,10 +30,10 @@ private val STRICT_WEB_URL_PATTERN = Pattern.compile("(((?:(?i:http|https|rtsp):
private val spanClasses = listOf(ForegroundColorSpan::class.java, URLSpan::class.java)
private val finders = mapOf(
FoundMatchType.HTTP_URL to PatternFinder(':', HTTP_URL_REGEX, 5),
FoundMatchType.HTTPS_URL to PatternFinder(':', HTTPS_URL_REGEX, 6),
FoundMatchType.TAG to PatternFinder('#', TAG_REGEX, 1),
FoundMatchType.MENTION to PatternFinder('@', MENTION_REGEX, 1)
FoundMatchType.HTTP_URL to PatternFinder(':', HTTP_URL_REGEX, 5, Character::isWhitespace),
FoundMatchType.HTTPS_URL to PatternFinder(':', HTTPS_URL_REGEX, 6, Character::isWhitespace),
FoundMatchType.TAG to PatternFinder('#', TAG_REGEX, 1, ::isValidForTagPrefix),
FoundMatchType.MENTION to PatternFinder('@', MENTION_REGEX, 1, Character::isWhitespace) // TODO: We also need a proper validator for mentions
)
private enum class FoundMatchType {
@ -49,7 +49,8 @@ private class FindCharsResult {
var end: Int = -1
}
private class PatternFinder(val searchCharacter: Char, regex: String, val searchPrefixWidth: Int) {
private class PatternFinder(val searchCharacter: Char, regex: String, val searchPrefixWidth: Int,
val prefixValidator: (Int) -> Boolean) {
val pattern: Pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE)
}
@ -67,7 +68,7 @@ private fun findPattern(string: String, fromIndex: Int): FindCharsResult {
val finder = finders[matchType]
if (finder!!.searchCharacter == c
&& ((i - fromIndex) < finder.searchPrefixWidth ||
Character.isWhitespace(string.codePointAt(i - finder.searchPrefixWidth)))) {
finder.prefixValidator(string.codePointAt(i - finder.searchPrefixWidth)))) {
result.matchType = matchType
result.start = max(0, i - finder.searchPrefixWidth)
findEndOfPattern(string, result, finder.pattern)
@ -87,10 +88,22 @@ private fun findEndOfPattern(string: String, result: FindCharsResult, pattern: P
// Once we have API level 26+, we can use named captures...
val end = matcher.end()
result.start = matcher.start()
if (Character.isWhitespace(string.codePointAt(result.start))) {
++result.start
when (result.matchType) {
FoundMatchType.TAG -> {
if (isValidForTagPrefix(string.codePointAt(result.start))) {
if (string[result.start] != '#' ||
(string[result.start] == '#' && string[result.start + 1] == '#')) {
++result.start
}
}
}
else -> {
if (Character.isWhitespace(string.codePointAt(result.start))) {
++result.start
}
}
}
when(result.matchType) {
when (result.matchType) {
FoundMatchType.HTTP_URL, FoundMatchType.HTTPS_URL -> {
// Preliminary url patterns are fast/permissive, now we'll do full validation
if (STRICT_WEB_URL_PATTERN.matcher(string.substring(result.start, end)).matches()) {
@ -133,3 +146,16 @@ fun highlightSpans(text: Spannable, colour: Int) {
}
}
}
private fun isWordCharacters(codePoint: Int): Boolean {
return (codePoint in 0x30..0x39) || // [0-9]
(codePoint in 0x41..0x5a) || // [A-Z]
(codePoint == 0x5f) || // _
(codePoint in 0x61..0x7a) // [a-z]
}
private fun isValidForTagPrefix(codePoint: Int): Boolean {
return !(isWordCharacters(codePoint) || // \w
(codePoint == 0x2f) || // /
(codePoint == 0x29)) // )
}