Allow "TBA" laps in TSN.XML.AutoRacingSchedule.

[dead/htsn-import.git] / src / Xml.hs

diff --git a/src/Xml.hs b/src/Xml.hs
index 780a64e6473815ecd0ec88d4257e4d1ce231373c..d4ea4679cef1bafc974e7d9eede7249b39957491 100644 (file)
--- a/src/Xml.hs
+++ b/src/Xml.hs
@@ -4,13 +4,17 @@
 -- | General XML stuff.
 --
 module Xml (
+  Child(..),
   DtdName(..),
   FromXml(..),
   FromXmlFk(..),
   ToDb(..),
   parse_opts,
+  parse_opts_novalidate,
   pickle_unpickle,
   unpickleable,
+  unsafe_read_document,
+  unsafe_read_invalid_document,
   unsafe_unpickle )
 where
 
@@ -22,6 +26,7 @@ import Text.XML.HXT.Core (
   (/>),
   PU,
   SysConfigList,
+  XmlTree,
   isElem,
   no,
   readDocument,
@@ -34,6 +39,8 @@ import Text.XML.HXT.Core (
   xunpickleVal,
   yes )
 
+
+
 -- | Common associated type shared by 'FromXml' and 'FromXmlFk'. This
 --   basically just forces the client to define the \"database
 --   version\" of his type.
@@ -58,22 +65,30 @@ class (ToDb a) => FromXml a where
   from_xml :: a -> Db a
 
 
--- | Some database types cannot be constructed from the XML type
---   alone; they must be supplied a foreign key to a parent object
---   first. Members of this class can be converted from an XML
---   representation to a database representation in this manner.
+-- | A class for XML representations which are children of other
+--   elements. The foal is to associate a child XML element with its
+--   parent element's database type. This is required to construct the
+--   database analogue of @a@ in 'FromXmlFk'.
 --
-class (ToDb a) => FromXmlFk a where
+class Child a where
   -- | The type of our parent object, i.e. to the type to whom our
   --   foreign key will point.
   type Parent a :: *
 
+
+-- | Some database types cannot be constructed from the XML type
+--   alone; they must be supplied a foreign key to a parent object
+--   first. Members of this class can be converted from an XML
+--   representation to a database representation in this manner.
+--
+class (Child a, ToDb a) => FromXmlFk a where
   -- | The function that produces a @Db a@ out of a foreign key and an
   --   @a@. The parameter order makes it easier to map this function
   --   over a bunch of things.
   from_xml_fk :: DefaultKey (Parent a) -> a -> Db a
 
 
+
 -- | Represents the DTD filename (\"SYSTEM\") part of the DOCTYPE
 --   definition.
 newtype DtdName = DtdName String
@@ -84,8 +99,14 @@ newtype DtdName = DtdName String
 --
 parse_opts :: SysConfigList
 parse_opts = [ withRemoveWS yes,
-               withSubstDTDEntities no,
-               withValidate no ]
+               withSubstDTDEntities no ]
+
+-- | Like 'parse_opts' except we don't validate the document against
+--   its DTD. This is useful when we need to parse a document that we
+--   /know/ is invalid so that we can deliver a better error message.
+--
+parse_opts_novalidate :: SysConfigList
+parse_opts_novalidate = (withValidate no) : parse_opts
 
 
 -- | Given an @unpickler@ and a @filepath@, attempt to unpickle the
@@ -153,3 +174,18 @@ unpickleable filepath unpickler = do
 unsafe_unpickle :: FilePath -> PU a -> IO a
 unsafe_unpickle filepath unpickler =
   fmap head $ runX $ xunpickleDocument unpickler parse_opts filepath
+
+
+-- | Read an XML document from a 'FilePath' into an XmlTree. Explode if it
+--   doesn't work.
+--
+unsafe_read_document :: FilePath -> IO XmlTree
+unsafe_read_document filepath =
+  fmap head $ runX $ readDocument parse_opts filepath
+
+-- | The same as 'unsafe_read_document', except it allows you to read
+--   documents which don't validate against their DTDs.
+--
+unsafe_read_invalid_document :: FilePath -> IO XmlTree
+unsafe_read_invalid_document filepath =
+  fmap head $ runX $ readDocument parse_opts_novalidate filepath