Special characters when loading template in Heist

sal

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Mar 10, 2016, 9:39:29 PM3/10/16

to Snap Framework

I have a toy code to load a simple template with "<foo>" tag, and replace its content using getLine capture. When I print it out using Builder -> ByteString conversion, I see "
" in some places. Are these special characters added by Heist? It seems so to me. Here is the code (without import statements):

-- show
runtime :: RuntimeSplice IO T.Text
runtime = liftIO $ do
    Prelude.putStrLn "Write something:"
    T.pack <$> getLine


splice :: Splice IO
splice = return $ yieldRuntimeText $ runtime
-- /show


heistConfig :: HeistConfig IO
heistConfig = emptyHeistConfig &
  (hcNamespace .~ "") &
  (hcCompiledSplices .~ ("foo" ## splice)) &
  (hcTemplateLocations .~ [loadTemplates "templates"])


main = do
    heistState <- either (error "init error") id <$>
         (runEitherT $ initHeist heistConfig)
    builder <- maybe (error "builder error") fst $
         renderTemplate heistState "simple"
    Data.ByteString.Char8.putStrLn $ toByteString builder

This is the output (putStrLn from main above is the last line):

*Main> main
Write something:
abc
<body>&#10;    abc&#10;</body>&#10;

This is actual template that is being loaded:

<body>
    <foo>
       Some text here 
    </foo>
</body>

Is there something wrong about my handling of the template that is causing insertion of "
" in the template at run-time? I tried to do some research to see if "
" has any special meaning but found nothing. So, will very much appreciate help with resolving this.

Link to gist with entire code and template (to reproduce the issue)

Thanks.

MightyByte

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Mar 10, 2016, 9:46:17 PM3/10/16

to snap_fr...@googlegroups.com

We are aware of this behavior. The "
" is an escaped linefeed
character. There is an outstanding issue for it on github here with
more details:

https://github.com/snapframework/heist/issues/8

Unfortunately the fix is a fair amount of work and since it doesn't
cause any actual problems in practice we've never gotten around to it.
I would love it if someone took the time to fix it.

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sal

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Mar 10, 2016, 10:41:53 PM3/10/16

to Snap Framework

Got it now. Thanks for response. This is not a big deal since it seems to be part of XML spec from what is stated in the bug description. I just wanted to know what is going on here. It was so mysterious (and un-googlable!) until you explained it.

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