feat: bitfield macro outside of a bitfield error message

to help simplify debugging with a less obscure error message
spider-gazelle · Nov 17, 2020 · a08c239 · a08c239
1 parent c7d6c13
commit a08c239
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diff --git a/shard.yml b/shard.yml
@@ -1,5 +1,5 @@
 name: bindata
-version: 1.8.0
+version: 1.8.1
 
 development_dependencies:
   ameba:

diff --git a/src/bindata.cr b/src/bindata.cr
@@ -350,7 +350,8 @@ abstract class BinData
   end
 
   macro bits(size, name, value = nil, default = nil)
-    %field = @@bit_fields["{{KLASS_NAME[0]}}_{{INDEX[0]}}"]
+    %field = @@bit_fields["{{KLASS_NAME[0]}}_{{INDEX[0]}}"]?
+    raise "#{KLASS_NAME[0]}#{ '#' }{{name}} is not defined in a bitfield. Using bitfield macro outside of a bitfield" unless %field
     %field.bits({{size}}, {{name.id.stringify}})
 
     {% if size <= 8 %}