RosettaCodeData/Task/URL-decoding/Retro/url-decoding.retro

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create buffer 32000 allot
{{
create bit 5 allot
: extract ( $c-$a ) drop @+ bit ! @+ bit 1+ ! bit ;
: render ( $c-$n )
dup '+ = [ drop 32 ] ifTrue
dup 13 = [ drop 32 ] ifTrue
dup 10 = [ drop 32 ] ifTrue
dup '% = [ extract hex toNumber decimal ] ifTrue ;
: <decode> ( $-$ ) repeat @+ 0; render ^buffer'add again ;
---reveal---
: decode ( $- ) buffer ^buffer'set <decode> drop ;
}}
"http%3A%2F%2Ffoo%20bar%2F" decode buffer puts