Modulehxt-9.3.1.22Haskell2010

Text.XML.HXT.Arrow.XmlState.TraceHandling

the trace arrows

valuesetTraceLevel :: Int -> IOStateArrow s b b

set the global trace level

valuegetTraceLevel :: IOStateArrow s b Int

read the global trace level

valuesetTraceCmd :: (Int -> String -> IO ()) -> IOStateArrow s b b

set the global trace command. This command does the trace output

valuegetTraceCmd :: IOStateArrow a b (Int -> String -> IO ())

acces the command for trace output

valuewithTraceLevel :: Int -> IOStateArrow s b c -> IOStateArrow s b c

run an arrow with a given trace level, the old trace level is restored after the arrow execution

valuetrace :: Int -> IOStateArrow s b String -> IOStateArrow s b b

apply a trace arrow and issue message to stderr

valuetraceValue :: Int -> (b -> String) -> IOStateArrow s b b

trace the current value transfered in a sequence of arrows.

The value is formated by a string conversion function. This is a substitute for the old and less general traceString function

valuetraceString :: Int -> (b -> String) -> IOStateArrow s b b

an old alias for traceValue

valuetraceMsg :: Int -> String -> IOStateArrow s b b

issue a string message as trace

valuetraceSource :: IOStateArrow s XmlTree XmlTree

issue the source representation of a document if trace level >= 3

for better readability the source is formated with indentDoc

valuetraceTree :: IOStateArrow s XmlTree XmlTree

issue the tree representation of a document if trace level >= 4

valuetraceDoc :: String -> IOStateArrow s XmlTree XmlTree

trace a main computation step issue a message when trace level >= 1, issue document source if level >= 3, issue tree when level is >= 4

valuetraceOutputToStderr :: Int -> String -> IO ()