feat: Add support for Token Based validators (WIP #2)

Author: Steve Ramage

src/main/kotlin/net/sjrx/intellij/plugins/systemdunitfiles/semanticdata/optionvalues/grammar/GrammarOptionValue.kt

@@ -293,14 +293,21 @@ open class GrammarOptionValue(
   override fun getErrorMessage(value: String): String? {
     val syntaticMatch = combinator.SyntacticMatch(value, 0)
 
-    if (syntaticMatch.matchResult == -1) {
-      return "Could not parse value"
-    }
+    try {
+
+      if (syntaticMatch.matchResult == -1) {
+        return "Could not parse value"
+      }
 
-    val semanticMatch = combinator.SemanticMatch(value, 0)
+      val semanticMatch = combinator.SemanticMatch(value, 0)
+
+      if (semanticMatch.matchResult == -1) {
+        return "Value did not semantically match"
+      }
 
-    if (semanticMatch.matchResult == -1) {
-      return "Value did not semantically match"
+    } catch (IllegalArgumentException: IllegalArgumentException) {
+      // TODO add logger
+      return null
     }
 
     return null