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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Substring/Lang5/substring.lang5 Normal file
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: cr "\n". ; [] '__A set : dip swap __A swap 1 compress append '__A set execute __A
-1 extract nip ; : nip swap drop ; : tuck swap over ; : -rot rot rot ; : 0= 0 == ; : 1+ 1 + ;
: 2dip swap 'dip dip ; : 2drop drop drop ; : |a,b> over - iota + ; : bi* 'dip dip execute ; : bi@ dup bi* ;
: comb "" split ; : concat "" join ; : empty? length 0= ; : tail over lensize |a,b> subscript ;
: lensize length nip ; : while do 'dup dip 'execute 2dip rot if dup 2dip else break then loop 2drop ;
: <substr> comb -rot over + |a,b> subscript concat ;
: str-tail tail concat ;
: str-index
: 2streq 2dup over lensize iota subscript eq '* reduce ;
swap 'comb bi@ length -rot 0 -rot
"2dup 'lensize bi@ <="
"2streq if 0 reshape else '1+ 2dip 0 extract drop then"
while empty? if 2drop tuck == if drop -1 then else 4 ndrop -1 then ;
'abcdefgh 'str set 2 'n set 3 'm set
n m str <substr>
str comb n str-tail
str "d" str-index m str <substr>
str "de" str-index m str <substr>