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705d68deec
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.
15 lines
713 B
Plaintext
15 lines
713 B
Plaintext
: _pd ( a -- n f, parse decimal )
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( We read the first char outside of the loop because it *has*
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to be nonzero, which means _pdacc *has* to return 0. )
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C@+ OVER C@ 0 ( a len firstchar startat )
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( if we have '-', we only advance. more processing later. )
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SWAP '-' = IF 1+ THEN ( a len startat )
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( We loop until _pdacc is nonzero, which means either WS or
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non-digit. 1 means WS, which means parsing was a success.
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-1 means non-digit, which means we have a non-decimal. )
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0 ROT ROT ( len ) ( startat ) DO ( a r )
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OVER I + C@ ( a r c ) _pdacc ( a r f )
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IF DROP 1- 0 UNLOOP EXIT THEN LOOP ( a r )
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( if we had '-', we need to invert result. )
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SWAP C@ '-' = IF 0 -^ THEN 1 ( r 1 ) ;
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