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+\ evaluate
+\ temporarily redirect the input source
+\ to string buffer. Return the the previous
+\ input source afterwards and continue
+
+\ #require imove.frt
+
+\ some helper words
+variable strlen
+variable str
+: source-string str @ strlen @ ;
+
+\ we have to distinguish between interpreted (RAM)
+\ and compiled (Flash) strings. First the RAM
+\ strings
+
+: (evaluate) \ i*x addr len -- j*y
+ ['] source defer@ >r
+ >in @ >r
+ 0 >in !
+ strlen !
+ str !
+ ['] source-string is source
+ ['] interpret catch
+ r> >in !
+ r> is source
+ throw
+;
+
+\ the compiled (Flash) strings are transferred
+\ to RAM and processed there.
+: [evaluate]
+ ( iaddr len -- )
+ dup >r
+ here imove
+ here r> (evaluate)
+;
+
+\ a state smart word to decide what to do.
+: evaluate
+ state @ if
+ postpone [evaluate]
+ else
+ (evaluate)
+ then
+; immediate