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1a08f436
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Date :
2010-08-25T09:23:17
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\ parses1.fth 2.8 95/04/19
\ Copyright 1985-1990 Bradley Forthware
headers
: +string ( adr len -- adr len+1 ) 1+ ;
: -string ( adr len -- adr+1 len-1 ) swap 1+ swap 1- ;
\ Splits a string into two halves before the first occurrence of
\ a delimiter character.
\ adra,lena is the string including and after the delimiter
\ adrb,lenb is the string before the delimiter
\ lena = 0 if there was no delimiter
: split-before ( adr len delim -- adra lena adrb lenb )
split-string 2swap
;
alias $split left-parse-string
: cindex ( adr len char -- [ index true ] | false )
false swap 2swap bounds ?do ( false char )
dup i c@ = if nip i true rot leave then
loop ( false char | index true char )
drop
;
\ Splits a string into two halves after the last occurrence of
\ a delimiter character.
\ adra,lena is the string after the delimiter
\ adrb,lenb is the string before and including the delimiter
\ lena = 0 if there was no delimiter
\ adra,lena is the string after the delimiter
\ adrb,lenb is the string before and including the delimiter
\ lena = 0 if there was no delimiter
: split-after ( adr len char -- adra lena adrb lenb )
>r 2dup + 0 ( adrb lenb adra 0 )
\ Throughout the loop, we maintain both substrings. Each time through,
\ we add a character to the "after" string and remove it from the "before".
\ The loop terminates when either the "before" string is empty or the
\ desired character is found
begin 2 pick while ( adrb lenb adra lena )
over 1- c@ r@ = if \ Found it ( adrb lenb adra lena )
r> drop 2swap exit ( adrb lenb adra lena )
then
2swap 1- 2swap swap 1- swap 1+ ( adrb lenb adra lena )
repeat ( adrb lenb adr1 len1 )
\ Character not found. lenb is 0.
r> drop 2swap
;
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