Merge pull request #321 from gerlero/fix-320

Fix handling of keyword entries without values in FoamFiles

foamlib/_files/_files.py

@@ -308,14 +308,14 @@ def __setitem__(self, keywords: str | tuple[str, ...] | None, data: Entry) -> No
                     self[(*keywords, k)] = v
 
             elif keywords:
+                val = dumps(data, kind=kind)
                 parsed.put(
                     keywords,
                     normalize(data, kind=kind),
                     before
                     + indentation
                     + dumps(keywords[-1])
-                    + b" "
-                    + dumps(data, kind=kind)
+                    + ((b" " + val) if val else b"")
                     + (b";" if not keywords[-1].startswith("#") else b"")
                     + after,
                 )

foamlib/_files/_parsing.py

@@ -272,6 +272,8 @@ def _keyword_entry_of(
 
 
 def parse_data(s: str) -> Data:
+    if not s.strip():
+        return ""
     return cast(Data, _DATA.parse_string(s, parse_all=True)[0])
 
 

foamlib/_files/_serialization.py

@@ -111,7 +111,10 @@ def dumps(
 
     if isinstance(data, tuple) and kind == Kind.SINGLE_ENTRY and len(data) == 2:
         k, v = data
-        ret = dumps(k) + b" " + dumps(v)
+        ret = dumps(k)
+        val = dumps(v)
+        if val:
+            ret += b" " + val
         if not isinstance(v, Mapping):
             ret += b";"
         return ret