Extract parseTypeLevelParamsOptional()

1 files changed, 19 insertions, 10 deletions

diff --git a/src/main/java/org/shedlang/compiler/parser/Parser.java b/src/main/java/org/shedlang/compiler/parser/Parser.java
index d7ee611d..9fb8a93b 100644
--- a/src/main/java/org/shedlang/compiler/parser/Parser.java
+++ b/src/main/java/org/shedlang/compiler/parser/Parser.java
@@ -914,16 +914,7 @@ public class Parser {
 
         var name = tokens.nextValue(TokenType.IDENTIFIER);
 
-        var typeLevelParams = Optional.<List<UntypedTypeLevelParamNode>>empty();
-        if (tokens.trySkip(TokenType.SYMBOL_SQUARE_OPEN)) {
-            typeLevelParams = Optional.of(parseMany(
-                () -> tokens.isNext(TokenType.SYMBOL_SQUARE_CLOSE),
-                () -> parseTypeLevelParam(tokens),
-                () -> tokens.trySkip(TokenType.SYMBOL_COMMA)
-            ));
-
-            tokens.skip(TokenType.SYMBOL_SQUARE_CLOSE);
-        }
+        var typeLevelParams = parseTypeLevelParamsOptional(tokens);
 
         tokens.skip(TokenType.SYMBOL_PAREN_OPEN);
         var fields = parseMany(
@@ -1213,6 +1204,24 @@ public class Parser {
         return new UntypedTupleTypeNode(elements, source);
     }
 
+    private static Optional<List<UntypedTypeLevelParamNode>> parseTypeLevelParamsOptional(
+        TokenIterator<TokenType> tokens
+    ) {
+        if (tokens.trySkip(TokenType.SYMBOL_SQUARE_OPEN)) {
+            var params = parseMany(
+                () -> tokens.isNext(TokenType.SYMBOL_SQUARE_CLOSE),
+                () -> parseTypeLevelParam(tokens),
+                () -> tokens.trySkip(TokenType.SYMBOL_COMMA)
+            );
+
+            tokens.skip(TokenType.SYMBOL_SQUARE_CLOSE);
+
+            return Optional.of(params);
+        } else {
+            return Optional.empty();
+        }
+    }
+
     private static UntypedTypeLevelParamNode parseTypeLevelParam(TokenIterator<TokenType> tokens) {
         var start = tokens.position();