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collapseos/blk/358
Virgil Dupras e31527f5ac Add word ROT>
There are many situations where it can be useful. Worth it.
2020-10-29 12:41:08 -04:00

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: _pd ( a -- n f, parse decimal )
C@+ OVER C@ 0 ( a len firstchar startat )
( if we have '-', we only advance. more processing later. )
SWAP '-' = IF 1+ THEN ( a len startat )
( if we can do the whole string, success. if _pdacc returns
false before, failure. )
0 ROT> ( len ) ( startat ) DO ( a r )
OVER I + C@ ( a r c ) _pdacc ( a r f )
NOT 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 ) ;