\glspl{SDS}.
\begin{lstlisting}[%
- language=Clean,label={lst:exprhier},caption={Expression role hierarchy}]
+ label={lst:exprhier},caption={Expression role hierarchy}]
:: Upd = Upd
:: Expr = Expr
:: Stmt = Stmt
and omitted in subsequent funcitons. Both the boolean expression and arithmetic
expression classes are shown in Listing~\ref{lst:arithbool}.
-\begin{lstlisting}[language=Clean,label={lst:arithbool},
+\begin{lstlisting}[label={lst:arithbool},
caption={Basic classes for expressions}]
class arith v where
lit :: t -> v t Expr
are the sequence operator and the \emph{if} statement. Both are shown in
Listing~\ref{lst:control}. The first class of \emph{If} statements describes
the regular \emph{if} statement. The expressions given can have any role. The
-functional dependency\todo{explain} on \CI{s} determines the return type of the
-statement. The sequence operator is very straightforward and just ties the two
-expressions together in sequence.
+functional dependency on \CI{s} determines the return type of the
+statement. The listing includes examples of implementations that illustrate
+this dependency.
+
+The sequence operator is very straightforward and just ties
+the two expressions together in sequence.
\begin{lstlisting}[%
- language=Clean,label={lst:control},caption={Control flow operators}]
+ label={lst:control},caption={Control flow operators}]
class If v q r ~s where
If :: (v Bool p) (v t q) (v t r) -> v t s | ...
+instance If Code Stmt Stmt Stmt
+instance If Code e Stmt Stmt
+instance If Code Stmt e Stmt
+instance If Code x y Expr
+
class seq v where
(:.) infixr 0 :: (v t p) (v u q) -> v u Stmt | ...
\end{lstlisting}
\section{Input/Output and class extensions}
Values can be assigned to all expressions that have an \CI{Upd} role. Examples
of such expressions are \glspl{SDS} and \gls{GPIO} pins. Moreover, class
-extensions can be created for specific peripherals such as builtin LEDs. The
-classes facilitating this are shown in Listing~\ref{lst:sdsio}. In this way the
-assignment is the same for every assignable entity.
+extensions can be created for specific peripherals such as builtin \glspl{LED}.
+The classes facilitating this are shown in Listing~\ref{lst:sdsio}. In this way
+the assignment is the same for every assignable entity.
\begin{lstlisting}[%
- language=Clean,label={lst:sdsio},caption={Input/Output classes}]
+ label={lst:sdsio},caption={Input/Output classes}]
:: DigitalPin = D0 | D1 | D2 | D3 | D4 | D5 |D6 | D7 | D8 | D9 | D10 | D11 | D12 | D13
:: AnalogPin = A0 | A1 | A2 | A3 | A4 | A5
:: UserLED = LED1 | LED2 | LED3
\gls{mTask} and make it recognizable by the type system.
\begin{lstlisting}[%
- language=Clean,label={lst:sdsclass},caption={\glspl{SDS} in \gls{mTask}}]
+ label={lst:sdsclass},caption={\glspl{SDS} in \gls{mTask}}]
:: In a b = In infix 0 a b
:: Main a = {main :: a}
similar fashion as the \texttt{sds} class. This class is listed in
Listing~\ref{lst:taskclass}. \glspl{Task} can have an argument and always have
to specify a delay or waiting time. The type signature of the \CI{mtask} is
-rather arcane and therefore an example is given. The aforementioned Listing
+complex and therefore an example is given. The aforementioned Listing
shows a simple specification containing one task that increments a value
indefinitely every one seconds.
-\begin{lstlisting}[language=Clean,label={lst:taskclass},%
+\begin{lstlisting}[label={lst:taskclass},%
caption={The classes for defining tasks}]
class mtask v a where
task :: (((v delay r) a->v MTask Expr)->In (a->v u p) (Main (v t q))) -> Main (v t q) | ...
Listing~\ref{lst:exmtask}. The \glspl{mTask} shown in the example do not belong
to a particular view and therefore are of the type \CI{View t r}. The
\CI{blink} \gls{mTask} show the classic \gls{Arduino} \emph{Hello World!}
-application that blinks a certain LED every second. The \CI{thermostat}
-expression will enable a digital pin powering a cooling fan when the analog
-pin representing a temperature sensor is too high. \CI{thermostat`} shows the
-same expression but now using the assignment style \gls{GPIO} technique.
+application that blinks a certain \gls{LED} every second. The \CI{thermostat}
+expression will enable a digital pin powering a cooling fan when the analog pin
+representing a temperature sensor is too high. \CI{thermostat`} shows the same
+expression but now using the assignment style \gls{GPIO} technique.
\begin{lstlisting}[%
- language=Clean,label={lst:exmtask},caption={Some example \glspl{mTask}}]
+ label={lst:exmtask},caption={Some example \glspl{mTask}}]
blink = task \blink=(\x.
IF (x ==. lit True) (ledOn led) (ledOff led) :.
blink (lit 1000) (Not x)
thermostat :: Main (View () Stmt)
thermostat = {main =
- IF (analogRead A0 >. 50)
+ IF (analogRead A0 >. lit 50)
( digitalWrite D0 (lit True) )
( digitalWrite D0 (lit False) )
}
thermostat` :: Main (View () Stmt)
thermostat` = let
a0 = aIO A0
- d0 = dIO D0 in {main = IF (a0 >. 50) (d0 =. lit True) (d0 =. lit False) }
+ d0 = dIO D0 in {main = IF (a0 >. lit 50) (d0 =. lit True) (d0 =. lit False) }
\end{lstlisting}
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