Add hamlet operator parsing from shakespeare#223

Corresponds to yesodweb/shakespeare#223

Bump xml-hamlet to 0.5.1 and update stackage build

stack.yaml

@@ -2,11 +2,4 @@ packages:
 - xml-conduit/
 - xml-hamlet/
 - html-conduit/
-resolver: lts-10.3
-extra-deps:
-- conduit-1.3.0
-- conduit-extra-1.3.0
-- resourcet-1.2.0
-- mono-traversable-1.0.8.1
-- unliftio-core-0.1.1.0
-- typed-process-0.2.1.0
+resolver: lts-11.22

xml-hamlet/Text/Hamlet/XMLParse.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE CPP #-}
 module Text.Hamlet.XMLParse
     ( Result (..)
     , Content (..)
@@ -15,7 +14,7 @@ module Text.Hamlet.XMLParse
 import Text.Shakespeare.Base
 import Control.Applicative ((<$>), Applicative (..))
 import Control.Monad
-import Data.Char (isUpper)
+import Data.Char (GeneralCategory(..), generalCategory, isUpper)
 import Data.Data
 import Text.ParserCombinators.Parsec hiding (Line)
 
@@ -223,7 +222,8 @@ parseLine = do
 
     ident :: Parser Ident
     ident = do
-      i <- many1 (alphaNum <|> char '_' <|> char '\'')
+      i <- many1 (alphaNum <|> char '_' <|> char '\'') <|>
+           (char '(' *> many1 (satisfy (\c -> generalCategory c == OtherPunctuation)) <* char ')')
       white
       return (Ident i)
      <?> "identifier"
@@ -247,7 +247,7 @@ parseLine = do
     isVariable (Ident (x:_)) = not (isUpper x)
     isVariable (Ident []) = error "isVariable: bad identifier"
 
-    isConstructor (Ident (x:_)) = isUpper x
+    isConstructor (Ident (x:_)) = isUpper x || generalCategory x == OtherPunctuation
     isConstructor (Ident []) = error "isConstructor: bad identifier"
 
     identPattern :: Parser Binding

xml-hamlet/xml-hamlet.cabal

@@ -1,5 +1,5 @@
 Name:                xml-hamlet
-Version:             0.5.0
+Version:             0.5.1
 Synopsis:            Hamlet-style quasiquoter for XML content
 Homepage:            http://www.yesodweb.com/
 License:             BSD3