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collapseos/blk/358
Virgil Dupras 705d68deec Move most of the high layer of comp core into the low one
With KEY and EMIT being switch words, most of the high layer can
be defined before drivers.

In addition to this change, I've compacted core blocks which were
becoming quite sparse.
2020-10-28 18:18:00 -04:00

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: _pd ( a -- n f, parse decimal )
( We read the first char outside of the loop because it *has*
to be nonzero, which means _pdacc *has* to return 0. )
C@+ OVER C@ 0 ( a len firstchar startat )
( if we have '-', we only advance. more processing later. )
SWAP '-' = IF 1+ THEN ( a len startat )
( We loop until _pdacc is nonzero, which means either WS or
non-digit. 1 means WS, which means parsing was a success.
-1 means non-digit, which means we have a non-decimal. )
0 ROT ROT ( len ) ( startat ) DO ( a r )
OVER I + C@ ( a r c ) _pdacc ( a r f )
IF DROP 1- 0 UNLOOP EXIT THEN LOOP ( a r )
( if we had '-', we need to invert result. )
SWAP C@ '-' = IF 0 -^ THEN 1 ( r 1 ) ;