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12 lines
503 B
Plaintext
12 lines
503 B
Plaintext
: _pd ( a -- n f, parse decimal )
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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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( if we can do the whole string, success. if _pdacc returns
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false before, failure. )
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0 ROT> ( len ) ( startat ) DO ( a r )
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OVER I + C@ ( a r c ) _pdacc ( a r f )
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NOT 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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