50 lines
1.1 KiB
Forth
50 lines
1.1 KiB
Forth
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\ implements split-before, split-after and left-split
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\ as described in 4.3 (Path resolution)
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\ delimeter returned in R-string
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: split-before ( addr len delim -- addr-R len-R addr-L len-L )
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0 rot dup >r 0 ?do
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( str char cnt R: len <sys> )
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2 pick over + c@ 2 pick = if leave then
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1+
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loop
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nip
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2dup + r> 2 pick -
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2swap
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;
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\ delimeter returned in L-string
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: split-after ( addr len delim -- addr-R len-R addr-L len-L )
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over 1- rot dup >r 0 ?do
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( str char cnt R: len <sys> )
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2 pick over + c@ 2 pick = if leave then
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1-
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loop
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nip
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dup 0 >= if 1+ else drop r@ then
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2dup + r> 2 pick -
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2swap
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;
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\ delimiter not returned
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: left-split ( addr len delim -- addr-R len-R addr-L len-L )
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0 rot dup >r 0 ?do
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( str char cnt R: len <sys> )
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2 pick i + c@ 2 pick = if leave then
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1+
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loop
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nip
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2dup + 1+ r> 2 pick -
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dup if 1- then
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2swap
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;
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\ delimiter not returned [THIS FUNCTION IS NOT NEEDED]
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: right-split ( addr len delim -- addr-R len-R addr-L len-L )
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dup >r
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split-after
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dup if 2dup + 1-
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c@ r@ = if 1- then then
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r> drop
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;
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