fix: handle style conflicts during automatic links detection

Author: kacperzolkiewski

android/src/main/java/com/swmansion/enriched/spans/EnrichedSpans.kt

@@ -1,8 +1,13 @@
 package com.swmansion.enriched.spans
 
-data class BaseSpanConfig(val clazz: Class<*>)
-data class ParagraphSpanConfig(val clazz: Class<*>, val isContinuous: Boolean)
-data class ListSpanConfig(val clazz: Class<*>, val shortcut: String)
+interface ISpanConfig {
+  val clazz: Class<*>
+}
+
+data class BaseSpanConfig(override  val clazz: Class<*>): ISpanConfig
+data class ParagraphSpanConfig(override  val clazz: Class<*>, val isContinuous: Boolean): ISpanConfig
+data class ListSpanConfig(override val clazz: Class<*>, val shortcut: String) : ISpanConfig
+
 
 data class StylesMergingConfig(
   // styles that should be removed when we apply specific style
@@ -62,6 +67,7 @@ object EnrichedSpans {
     MENTION to BaseSpanConfig(EnrichedMentionSpan::class.java),
   )
 
+  val allSpans: Map<String, ISpanConfig> = inlineSpans + paragraphSpans + listSpans + parametrizedStyles
   val mergingConfig: Map<String, StylesMergingConfig> = mapOf(
     BOLD to StylesMergingConfig(
       blockingStyles = arrayOf(CODE_BLOCK)

android/src/main/java/com/swmansion/enriched/styles/ParametrizedStyles.kt

@@ -104,15 +104,36 @@ class ParametrizedStyles(private val view: EnrichedTextInputView) {
     return Triple(result, start, end)
   }
 
+  private fun detectLinkConflicts(spannable: Spannable, start: Int, end: Int): Boolean {
+    val mergingConfig = EnrichedSpans.mergingConfig[EnrichedSpans.LINK] ?: return false
+    val conflictingStyles = mergingConfig.conflictingStyles
+    val blockingStyles = mergingConfig.blockingStyles
+
+    for (style in blockingStyles) {
+      val spans = spannable.getSpans(start, end, EnrichedSpans.allSpans[style]?.clazz)
+      if (spans.isNotEmpty()) return true
+    }
+
+    for (style in conflictingStyles) {
+      val spans = spannable.getSpans(start, end, EnrichedSpans.allSpans[style]?.clazz)
+      if (spans.isNotEmpty()) return true
+    }
+
+    return false
+  }
+
   private fun afterTextChangedLinks(result: Triple<String, Int, Int>) {
     // Do not detect link if it's applied manually
     if (isSettingLinkSpan) return
     val spannable = view.text as Spannable
     val (word, start, end) = result
 
+    if (detectLinkConflicts(spannable, start, end)) {
+      return
+    }
+
     // TODO: Consider using more reliable regex, this one matches almost anything
     val urlPattern = android.util.Patterns.WEB_URL.matcher(word)
-
     val spans = spannable.getSpans(start, end, EnrichedLinkSpan::class.java)
     for (span in spans) {
       spannable.removeSpan(span)