mirror of
https://github.com/irmen/prog8.git
synced 2024-12-25 23:29:55 +00:00
155 lines
4.2 KiB
ReStructuredText
155 lines
4.2 KiB
ReStructuredText
====
|
|
TODO
|
|
====
|
|
|
|
|
|
IF_XX::
|
|
|
|
if[_XX] [<expression>] {
|
|
...
|
|
}
|
|
[ else {
|
|
... ; evaluated when the condition is not met
|
|
} ]
|
|
|
|
|
|
==> DESUGARING ==>
|
|
|
|
(no else:)::
|
|
|
|
if[_!XX] [<expression>] goto prog8_if_999_end ; !XX being the conditional inverse of XX
|
|
.... (true part)
|
|
prog8_if_999_end ; code continues after this
|
|
|
|
|
|
(with else)::
|
|
|
|
if[_XX] [<expression>] goto prog8_if_999
|
|
... (else part)
|
|
goto prog8_if_999_end
|
|
prog8_if_999 ... (true part)
|
|
prog8_if_999_end ; code continues after this
|
|
|
|
|
|
IF X <COMPARISON> Y
|
|
|
|
==> DESUGARING ==>::
|
|
|
|
compare X, Y
|
|
if_XX goto ....
|
|
XX based on <COMPARISON>.
|
|
|
|
|
|
While::
|
|
|
|
while[_XX] <expression> {
|
|
...
|
|
continue
|
|
break
|
|
}
|
|
|
|
==> DESUGARING ==>::
|
|
|
|
goto prog8_while_999_check ; jump to the check
|
|
prog8_while_999
|
|
... (code)
|
|
goto prog8_while_999 ;continue
|
|
goto prog8_while_999_end ;break
|
|
prog8_while_999_check
|
|
if[_XX] <expression> goto prog8_while_999 ; loop condition
|
|
prog8_while_999_end ; code continues after this
|
|
|
|
|
|
Repeat::
|
|
|
|
repeat {
|
|
...
|
|
continue
|
|
break
|
|
} until[_XX] <expressoin>
|
|
|
|
==> DESUGARING ==>::
|
|
|
|
prog8_repeat_999
|
|
... (code)
|
|
goto prog8_repeat_999 ;continue
|
|
goto prog8_repeat_999_end ;break
|
|
if[_!XX] <expression> goto prog8_repeat_999 ; loop condition via conditional inverse of XX
|
|
prog8_repeat_999_end ; code continues after this
|
|
|
|
|
|
For::
|
|
|
|
for <loopvar> = <from_expression> to <to_expression> [step <step_expression>] {
|
|
...
|
|
break
|
|
continue
|
|
}
|
|
|
|
|
|
@todo how to do signed integer loopvars?
|
|
|
|
|
|
==> DESUGARING ==>::
|
|
|
|
loopvar = <from_expression>
|
|
compare loopvar, <to_expression>
|
|
if_ge goto prog8_for_999_end ; loop condition
|
|
step = <step_expression> ; (store only if step < -1 or step > 1)
|
|
prog8_for_999
|
|
goto prog8_for_999_end ;break
|
|
goto prog8_for_999_loop ;continue
|
|
.... (code)
|
|
prog8_for_999_loop
|
|
loopvar += step ; (if step > 1 or step < -1)
|
|
loopvar++ ; (if step == 1)
|
|
loopvar-- ; (if step == -1)
|
|
goto prog8_for_999 ; continue the loop
|
|
prog8_for_999_end ; code continues after this
|
|
|
|
|
|
|
|
### Macros
|
|
|
|
@todo macros are meta-code that is executed by the compiler, in a preprecessing step
|
|
during the compilation, and can produce output that is then replaced on that point in the input source.
|
|
Allows us to create pre calculated sine tables and such.
|
|
|
|
|
|
|
|
Memory Block Operations
|
|
^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
@todo matrix,list,string memory block operations:
|
|
|
|
- matrix type operations (whole matrix, per row, per column, individual row/column)
|
|
operations: set, get, copy (from another matrix with the same dimensions, or list with same length),
|
|
shift-N (up, down, left, right, and diagonals, meant for scrolling)
|
|
rotate-N (up, down, left, right, and diagonals, meant for scrolling)
|
|
clear (set whole matrix to the given value, default 0)
|
|
|
|
- list operations (whole list, individual element)
|
|
operations: set, get, copy (from another list with the same length), shift-N(left,right), rotate-N(left,right)
|
|
clear (set whole list to the given value, default 0)
|
|
|
|
- list and matrix operations ofcourse work identical on vars and on memory mapped vars of these types.
|
|
|
|
- strings: identical operations as on lists.
|
|
|
|
- matrix with row-interleave can only be a memory mapped variable and can be used to directly
|
|
access a rectangular area within another piece of memory - such as a rectangle on the (character) screen
|
|
|
|
these should call (or emit inline) optimized pieces of assembly code, so they run as fast as possible
|
|
|
|
|
|
|
|
Bitmap Definition (for Sprites and Characters)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
to define CHARACTERS (8x8 monochrome or 4x8 multicolor = 8 bytes)
|
|
--> PLACE in memory on correct address (???k aligned)
|
|
|
|
and SPRITES (24x21 monochrome or 12x21 multicolor = 63 bytes)
|
|
--> PLACE in memory on correct address (base+sprite pointer, 64-byte aligned)
|
|
|