Add custom model predicates

Add regex support

Add and and or predicates

src/main/kotlin/moe/nea/firmament/features/texturepack/StringMatcher.kt

@@ -0,0 +1,70 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.features.texturepack
+
+import com.google.gson.JsonElement
+import com.google.gson.JsonObject
+import com.google.gson.JsonPrimitive
+import java.util.function.Predicate
+import net.minecraft.nbt.NbtString
+import net.minecraft.text.Text
+import moe.nea.firmament.util.removeColorCodes
+
+interface StringMatcher {
+    fun matches(string: String): Boolean
+    fun matches(text: Text): Boolean {
+        return matches(text.string)
+    }
+
+    fun matches(nbt: NbtString): Boolean {
+        val string = nbt.asString()
+        val jsonStart = string.indexOf('{')
+        val stringStart = string.indexOf('"')
+        val isString = stringStart >= 0 && string.subSequence(0, stringStart).isBlank()
+        val isJson = jsonStart >= 0 && string.subSequence(0, jsonStart).isBlank()
+        if (isString || isJson)
+            return matches(Text.Serialization.fromJson(string) ?: return false)
+        return matches(string)
+    }
+
+    class Equals(input: String, val stripColorCodes: Boolean) : StringMatcher {
+        private val expected = if (stripColorCodes) input.removeColorCodes() else input
+        override fun matches(string: String): Boolean {
+            return expected == (if (stripColorCodes) string.removeColorCodes() else string)
+        }
+    }
+
+    class Pattern(patternWithColorCodes: String, val stripColorCodes: Boolean) : StringMatcher {
+        private val regex: Predicate<String> = patternWithColorCodes.toPattern().asMatchPredicate()
+        override fun matches(string: String): Boolean {
+            return regex.test(if (stripColorCodes) string.removeColorCodes() else string)
+        }
+    }
+
+    companion object {
+        fun parse(jsonElement: JsonElement): StringMatcher {
+            if (jsonElement is JsonPrimitive) {
+                return Equals(jsonElement.asString, true)
+            }
+            if (jsonElement is JsonObject) {
+                val regex = jsonElement["regex"] as JsonPrimitive?
+                val text = jsonElement["text"] as JsonPrimitive?
+                val shouldStripColor = when (val color = (jsonElement["color"] as JsonPrimitive?)?.asString) {
+                    "preserve" -> false
+                    "strip", null -> true
+                    else -> error("Unknown color preservation mode: $color")
+                }
+                if ((regex == null) == (text == null)) error("Could not parse $jsonElement as string matcher")
+                if (regex != null)
+                    return Pattern(regex.asString, shouldStripColor)
+                if (text != null)
+                    return Equals(text.asString, shouldStripColor)
+            }
+            error("Could not parse $jsonElement as a string matcher")
+        }
+    }
+}