diff --git a/app/src/main/java/com/pixelized/rplexicon/script/Script.kt b/app/src/main/java/com/pixelized/rplexicon/script/Script.kt
new file mode 100644
index 0000000..7ec07be
--- /dev/null
+++ b/app/src/main/java/com/pixelized/rplexicon/script/Script.kt
@@ -0,0 +1,88 @@
+package com.pixelized.rplexicon.script
+
+import com.pixelized.rplexicon.data.model.alteration.Alteration
+
+sealed class Script(
+    val predicate: ScriptExecutor.() -> Boolean
+) {
+    class OR(
+        private vararg val scripts: Script,
+    ) : Script(predicate = {
+        scripts.any { it.predicate.invoke(this) }
+    }) {
+        override fun toString(): String {
+            return scripts.joinToString(
+                prefix = "(",
+                postfix = ")",
+                separator = " || "
+            ) { it.toString() }
+        }
+    }
+
+    class AND(
+        private vararg val scripts: Script,
+    ) : Script(predicate = {
+        scripts.all { it.predicate.invoke(this) }
+    }) {
+        override fun toString(): String {
+            return scripts.joinToString(
+                prefix = "(",
+                postfix = ")",
+                separator = " && "
+            ) { it.toString() }
+        }
+    }
+
+    class ACTIVE(
+        val alteration: String,
+    ) : Script(predicate = {
+        alterations.any { it.name == alteration }
+    }) {
+        override fun toString(): String {
+            return "ACTIVE('$alteration')"
+        }
+    }
+
+    class ANY(
+        val alteration: String,
+    ) : Script(predicate = {
+        alterations.any { it.name.contains(alteration) }
+    }) {
+        override fun toString(): String {
+            return "ANY('$alteration')"
+        }
+    }
+
+    class NOT(
+        val alteration: String,
+    ) : Script(predicate = {
+        alterations.none { it.name == alteration }
+    }) {
+        override fun toString(): String {
+            return "NOT('$alteration')"
+        }
+    }
+
+    class NONE(
+        val alteration: String,
+    ) : Script(predicate = {
+        alterations.none { it.name.contains(alteration) }
+    }) {
+        override fun toString(): String {
+            return "NONE('$alteration')"
+        }
+    }
+
+    operator fun ScriptExecutor.invoke() = predicate()
+}
+
+class ScriptExecutor(
+    val alterations: List<Alteration>,
+)
+
+fun scriptExecutor(
+    alterations: List<Alteration>,
+    block: ScriptExecutor.() -> Boolean
+): Boolean {
+    return ScriptExecutor(alterations = alterations).run(block)
+}
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diff --git a/app/src/main/java/com/pixelized/rplexicon/script/ScriptParser.kt b/app/src/main/java/com/pixelized/rplexicon/script/ScriptParser.kt
new file mode 100644
index 0000000..31ff0a2
--- /dev/null
+++ b/app/src/main/java/com/pixelized/rplexicon/script/ScriptParser.kt
@@ -0,0 +1,58 @@
+package com.pixelized.rplexicon.script
+
+class ScriptParser {
+    companion object {
+        private val FUNCTION_REGEX = Regex("""^(\w+)\((?:(.*);(.*)|(.*))\)$""")
+
+        private const val AND = "AND"
+        private const val OR = "OR"
+        private const val IS_ACTIVE = "ACT"
+        private const val ANY = "ANY"
+        private const val NOT = "NOT"
+        private const val NONE = "NONE"
+
+        fun check(function: String, vararg params: String?, block: () -> Script): Script {
+            if (params.any { it.isNullOrEmpty() }) error("$function parameter malformed")
+            return block.invoke()
+        }
+    }
+
+    fun parse(value: String): Script {
+        val result = FUNCTION_REGEX.findAll(value)
+
+        return result.firstOrNull()?.let { matchResult ->
+            val (function, param1, param2, mono) = matchResult.destructured
+            when (function) {
+                AND -> check(AND, param1, param2) { Script.AND(parse(param1), parse(param2)) }
+                OR -> check(OR, param1, param2) { Script.OR(parse(param1), parse(param2)) }
+                IS_ACTIVE -> check(IS_ACTIVE, mono) { Script.ACTIVE(mono) }
+                ANY -> check(ANY, mono) { Script.ANY(mono) }
+                NOT -> check(NOT, mono) { Script.NOT(mono) }
+                NONE -> check(NONE, mono) { Script.NONE(mono) }
+                else -> error("Unrecognized function: $function")
+            }
+        } ?: error("Malformed script: should start with a function call.")
+    }
+}
+
+fun main() {
+    val parser = ScriptParser()
+    val script = listOf(
+        """ACT(Hache de guerre en argent)""",
+        """ACT(Forme sauvage : Loup)""",
+        """ACT(Forme sauvage ; Chat)""",
+        """AND(ACT(Hache de guerre en argent);NOT(Bouclier))""",
+        """OR(AND(NOT(Hache);ACT(Épée));ACT(Bouclier))""",
+        """NONE(Forme sauvage)""",
+    )
+    script.forEach {
+        println("Input << $it")
+        try {
+            println("Output >> ${parser.parse(it)}")
+        } catch (e: Exception) {
+            println("Output >> $e")
+        } finally {
+            println("")
+        }
+    }
+}
\ No newline at end of file