90 lines
2.3 KiB
Forth
90 lines
2.3 KiB
Forth
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\ Define data space that will be used by the serial cog
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create bufserstack 40 allot \ Data stack space
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create bufserreturn 40 allot \ Return stack space
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create bufserbuffer 32 allot \ Serial buffer
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create bufserrdindex 0 , \ Read index
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create bufserwrindex 0 , \ Write index
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\ This word runs in a separate cog and writes input characters into the buffer
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: bufsercog
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bufserbuffer
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begin
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getchar over bufserwrindex @ + c!
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bufserwrindex dup @ 1 + 31 and swap !
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again ;
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\ This word replaces the old KEY word with one that reads from the buffer
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: bufkey
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bufserrdindex @
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begin
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dup
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bufserwrindex @
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-
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until
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bufserbuffer + c@
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bufserrdindex dup @ 1 + 31 and swap !
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;
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\ This is the cog configuration structure used by the serial cog
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create bufserconfig \ Forth cog config structure
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' bufsercog >body , \ Get execution token for TOGGLE
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bufserstack , \ Initial value of stack ptr
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bufserstack , \ Empty value for stack ptr
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bufserreturn , \ Initial value of return ptr
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bufserreturn , \ Empty value for return ptr
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\ This word starts a cog running the BUFSER word
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: startbufsercog forth @ bufserconfig cognew ;
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\ This word starts the serial cog and sets key to the new one
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: bufser startbufsercog ['] bufkey is key ;
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\ Buffer the serial input into memory until an ESC is received
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: bufferit here 256 + dup
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." Buffering serial input to memory" cr
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." Enter <ESC> to exit" cr
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begin
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key dup 27 <>
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while
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over c! 1+
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repeat
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drop over -
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\ over infile cog!
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;
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\ Determine the length of the current line
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: linelen ( addr count -- addr len )
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>r dup ( addr ptr ) ( left )
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begin
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r@ 0 <=
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if over - r> drop exit then
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dup c@ dup 10 = swap 13 = or
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if over - r> drop exit then
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1+ r> 1- >r
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again
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;
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\ Variables to store the buffer address and count
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variable evalbufaddr
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variable evalbufcount
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\ Evaluate a buffer containing multiple lines
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: evalbuf ( addr count )
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evalbufcount !
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evalbufaddr !
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begin
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evalbufcount @ 0 >
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while
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evalbufaddr @ evalbufcount @
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linelen
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dup 1+ dup
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evalbufaddr @ + evalbufaddr !
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evalbufcount @ swap - evalbufcount !
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over over type cr
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evaluate
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repeat
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;
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\ Redefine switch to use buffered serial
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\ : switch bufser ;
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