Parsing: Added stateCaption.

This is primarily for use in the LaTeX reader, so far.

src/Text/Pandoc/Parsing.hs

@@ -857,7 +857,7 @@ data ParserState = ParserState
       -- Triple represents: 1) Base role, 2) Optional format (only for :raw:
       -- roles), 3) Source language annotation for code (could be used to
       -- annotate role classes too).
-
+      stateCaption         :: Maybe Inlines, -- ^ Caption in current environment
       stateWarnings        :: [String]       -- ^ Warnings generated by the parser
     }
 
@@ -927,6 +927,7 @@ defaultParserState =
                   stateMacros          = [],
                   stateRstDefaultRole  = "title-reference",
                   stateRstCustomRoles  = M.empty,
+                  stateCaption         = Nothing,
                   stateWarnings        = []}
 
 -- | Succeed only if the extension is enabled.