factor/basis/csv/csv.factor

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! Copyright (C) 2007, 2008 Phil Dawes, 2013 John Benediktsson
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! See http://factorcode.org/license.txt for BSD license.
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USING: combinators fry io io.files io.streams.string kernel
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make math memoize namespaces sbufs sequences sequences.private
unicode ;
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IN: csv
SYMBOL: delimiter
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CHAR: , delimiter set-global
<PRIVATE
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MEMO: field-delimiters ( delimiter -- field-seps quote-seps )
[ "\r\n" swap prefix ] [ "\r\"\n" swap prefix ] bi ; inline
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DEFER: quoted-field,
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: maybe-escaped-quote ( delimeter stream quoted? -- delimiter stream sep/f )
2over stream-read1 tuck =
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[ nip ] [
{
{ CHAR: \" [ [ CHAR: \" , ] when quoted-field, ] }
{ CHAR: \n [ ] } ! Error: cr inside string?
{ CHAR: \r [ ] } ! Error: lf inside string?
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[ [ , drop f maybe-escaped-quote ] when* ]
} case
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] if ; inline recursive
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: quoted-field, ( delimiter stream -- delimiter stream sep/f )
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"\"" over stream-read-until drop % t maybe-escaped-quote ;
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: quoted-field ( delimiter stream -- sep/f field )
[ quoted-field, 2nip ] "" make ;
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: ?trim ( string -- string' )
dup length [ drop "" ] [
over first-unsafe blank?
[ drop t ] [ 1 - over nth-unsafe blank? ] if
[ [ blank? ] trim ] when
] if-zero ; inline
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: continue-field ( delimiter stream field-seps seq -- sep/f field )
swap rot stream-read-until [ "\"" glue ] dip
swap ?trim nipd ; inline
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: field ( delimiter stream field-seps quote-seps -- sep/f field )
pick stream-read-until dup CHAR: \" = [
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drop [ drop quoted-field ] [ continue-field ] if-empty
] [ 3nipd swap ?trim ] if ;
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: (stream-read-row) ( delimiter stream field-end quoted-field -- sep/f fields )
[ [ dup '[ dup _ = ] ] keep ] 3dip
'[ drop _ _ _ _ field ] produce ; inline
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: (stream-read-csv) ( stream -- )
[ dup [ empty? ] all? [ drop ] [ , ] if ]
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delimiter get rot over field-delimiters
'[ _ _ _ _ (stream-read-row) ] do while ;
PRIVATE>
: stream-read-row ( stream -- row )
delimiter get tuck field-delimiters
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(stream-read-row) nip ; inline
: read-row ( -- row )
input-stream get stream-read-row ; inline
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: stream-read-csv ( stream -- rows )
[ (stream-read-csv) ] { } make
dup ?last { "" } = [ but-last ] when ; inline
: read-csv ( -- rows )
input-stream get stream-read-csv ; inline
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: string>csv ( string -- csv )
[ read-csv ] with-string-reader ;
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: file>csv ( path encoding -- csv )
[ read-csv ] with-file-reader ;
: with-delimiter ( ch quot -- )
[ delimiter ] dip with-variable ; inline
<PRIVATE
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: needs-escaping? ( cell delimiter -- ? )
'[ dup "\n\"\r" member? [ drop t ] [ _ = ] if ] any? ; inline
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: escape-quotes ( cell stream -- )
CHAR: \" over stream-write1 swap [
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[ over stream-write1 ]
[ dup CHAR: \" = [ over stream-write1 ] [ drop ] if ] bi
] each CHAR: \" swap stream-write1 ;
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: escape-if-required ( cell delimiter stream -- )
[ dupd needs-escaping? ] dip
[ escape-quotes ] [ stream-write ] bi-curry if ; inline
: (stream-write-row) ( row delimiter stream -- )
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[ '[ _ _ stream-write1 ] ] 2keep
'[ _ _ escape-if-required ] interleave nl ; inline
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PRIVATE>
: stream-write-row ( row stream -- )
delimiter get swap (stream-write-row) ; inline
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: write-row ( row -- )
output-stream get stream-write-row ; inline
: stream-write-csv ( rows stream -- )
delimiter get swap '[ _ _ (stream-write-row) ] each ;
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: write-csv ( rows -- )
output-stream get stream-write-csv ;
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: csv>string ( csv -- string )
[ write-csv ] with-string-writer ;
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: csv>file ( rows path encoding -- )
[ write-csv ] with-file-writer ;