factor/basis/interpolate/interpolate.factor

91 lines
2.2 KiB
Factor

! Copyright (C) 2008, 2009 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors fry generalizations io io.streams.string kernel
locals macros make math math.order math.parser multiline
namespaces present sequences splitting strings vocabs.parser ;
IN: interpolate
<PRIVATE
TUPLE: named-var name ;
TUPLE: stack-var n ;
TUPLE: anon-var ;
: (parse-interpolate) ( str -- )
[
"${" split1-slice [
[ >string , ] unless-empty
] [
[
"}" split1-slice
[
>string dup string>number
[ 1 + stack-var boa ]
[ [ anon-var new ] [ named-var boa ] if-empty ] ?if ,
]
[ (parse-interpolate) ] bi*
] when*
] bi*
] unless-empty ;
: deanonymize ( seq -- seq' )
0 over <reversed> [
dup anon-var? [
drop 1 + dup stack-var boa
] when
] map! 2drop ;
: parse-interpolate ( str -- seq )
[ (parse-interpolate) ] { } make deanonymize ;
: max-stack-var ( seq -- n/f )
f [
dup stack-var? [ n>> [ or ] keep max ] [ drop ] if
] reduce ;
:: (interpolate-quot) ( str quot -- quot' )
str parse-interpolate :> args
args max-stack-var :> vars
args [
dup named-var? [
name>> quot call '[ _ @ present write ]
] [
dup stack-var? [
n>> '[ _ npick present write ]
] [
'[ _ write ]
] if
] if
] map concat
vars [
'[ _ ndrop ] append
] when* ; inline
PRIVATE>
: interpolate-quot ( str -- quot )
[ [ get ] ] (interpolate-quot) ;
MACRO: interpolate ( str -- quot )
interpolate-quot ;
: interpolate>string ( str -- newstr )
[ interpolate ] with-string-writer ; inline
: interpolate-locals-quot ( str -- quot )
[ dup search [ [ ] ] [ [ get ] ] ?if ] (interpolate-quot) ;
MACRO: interpolate-locals ( str -- quot )
interpolate-locals-quot ;
: interpolate-locals>string ( str -- newstr )
[ interpolate-locals ] with-string-writer ; inline
SYNTAX: [I
"I]" parse-multiline-string
interpolate-locals-quot append! ;