123 lines
3.6 KiB
Factor
123 lines
3.6 KiB
Factor
! 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
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unicode.categories ;
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IN: csv
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SYMBOL: delimiter
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CHAR: , delimiter set-global
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<PRIVATE
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MEMO: field-delimiters ( delimiter -- field-seps quote-seps )
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[ "\n" swap prefix ] [ "\"\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 )
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2over stream-read1 swap over =
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[ nip ] [
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{
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{ CHAR: " [ [ CHAR: " , ] when quoted-field, ] }
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{ CHAR: \n [ ] } ! Error: newline inside string?
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[ [ , drop f maybe-escaped-quote ] when* ]
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} 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 )
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[ quoted-field, 2nip ] "" make ;
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: ?trim ( string -- string' )
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dup length [ drop "" ] [
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over first-unsafe blank?
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[ drop t ] [ 1 - over nth-unsafe blank? ] if
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[ [ blank? ] trim ] when
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] if-zero ; inline
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: continue-field ( delimiter stream field-seps seq -- sep/f field )
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swap rot stream-read-until [ "\"" glue ] dip
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swap ?trim [ drop ] 2dip ; inline
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: field ( delimiter stream field-seps quote-seps -- sep/f field )
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pick stream-read-until dup CHAR: " = [
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drop [ drop quoted-field ] [ continue-field ] if-empty
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] [ [ 3drop ] 2dip swap ?trim ] if ;
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: (stream-read-row) ( delimiter stream field-end quoted-field -- sep/f fields )
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[ [ dup '[ dup _ = ] ] keep ] 3dip
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'[ drop _ _ _ _ field ] produce ; inline
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: (stream-read-csv) ( stream -- )
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[ dup [ empty? ] all? [ drop ] [ , ] if ]
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delimiter get rot over field-delimiters
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'[ _ _ _ _ (stream-read-row) ] do while ;
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PRIVATE>
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: stream-read-row ( stream -- row )
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delimiter get swap over field-delimiters
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(stream-read-row) nip ; inline
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: read-row ( -- row )
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input-stream get stream-read-row ; inline
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: stream-read-csv ( stream -- rows )
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[ (stream-read-csv) ] { } make
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dup ?last { "" } = [ but-last ] when ; inline
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: read-csv ( -- rows )
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input-stream get stream-read-csv ; inline
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: string>csv ( string -- csv )
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[ read-csv ] with-string-reader ;
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: file>csv ( path encoding -- csv )
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[ read-csv ] with-file-reader ;
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: with-delimiter ( ch quot -- )
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[ delimiter ] dip with-variable ; inline
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<PRIVATE
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: needs-escaping? ( cell delimiter -- ? )
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'[ dup "\n\"" member? [ drop t ] [ _ = ] if ] any? ; inline
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: escape-quotes ( cell stream -- )
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CHAR: " over stream-write1 swap [
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[ over stream-write1 ]
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[ dup CHAR: " = [ over stream-write1 ] [ drop ] if ] bi
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] each CHAR: " swap stream-write1 ;
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: escape-if-required ( cell delimiter stream -- )
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[ dupd needs-escaping? ] dip
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[ escape-quotes ] [ stream-write ] bi-curry if ; inline
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: (stream-write-row) ( row delimiter stream -- )
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[ '[ _ _ stream-write1 ] ] 2keep
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'[ _ _ escape-if-required ] interleave nl ; inline
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PRIVATE>
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: stream-write-row ( row stream -- )
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delimiter get swap (stream-write-row) ; inline
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: write-row ( row -- )
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output-stream get stream-write-row ; inline
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: stream-write-csv ( rows stream -- )
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delimiter get swap '[ _ _ (stream-write-row) ] each ;
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: write-csv ( rows -- )
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output-stream get stream-write-csv ;
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: csv>string ( csv -- string )
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[ write-csv ] with-string-writer ;
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: csv>file ( rows path encoding -- )
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[ write-csv ] with-file-writer ;
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