21 lines
728 B
Factor
21 lines
728 B
Factor
USING: math sequences kernel ;
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! starting from n characters in and of m length
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: subseq* ( from length seq -- newseq ) [ over + ] dip subseq ;
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! starting from n characters in, up to the end of the string
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: dummy ( seq n -- tailseq ) tail ;
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! whole string minus last character
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: dummy1 ( seq -- headseq ) but-last ;
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USING: fry sequences kernel ;
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! helper word
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: subseq-from-* ( subseq len seq quot -- seq ) [ nip ] prepose 2keep subseq* ; inline
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! starting from a known character within the string and of m length;
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: subseq-from-char ( char len seq -- seq ) [ index ] subseq-from-* ;
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! starting from a known substring within the string and of m length.
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: subseq-from-seq ( subseq len seq -- seq ) [ start ] subseq-from-* ;
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