1 ! Copyright (C) 2007, 2008 Phil Dawes
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: kernel sequences io namespaces make combinators
4 unicode.categories io.files combinators.short-circuit
5 io.streams.string fry memoize ;
10 CHAR: , delimiter set-global
14 : delimiter> ( -- delimiter ) delimiter get ; inline
16 MEMO: (field-end) ( delimiter -- delimiter' )
17 "\n" swap suffix ; inline
19 : skip-to-field-end ( -- endchar )
20 delimiter> (field-end) read-until nip ; inline
24 MEMO: (quoted-field) ( delimiter -- delimiter' )
25 "\"\n" swap suffix ; inline
27 : not-quoted-field ( -- endchar )
28 delimiter> (quoted-field) read-until
30 [ 2drop quoted-field ]
31 [ swap [ blank? ] trim % ]
34 : maybe-escaped-quote ( -- endchar )
36 { CHAR: " [ , quoted-field ] }
39 [ 2drop skip-to-field-end ]
42 : quoted-field ( -- endchar )
44 drop % maybe-escaped-quote ;
46 : field ( -- sep string )
47 [ not-quoted-field ] "" make ;
50 f delimiter> '[ dup _ = ]
51 [ drop field , ] do while ;
53 : row ( -- eof? array[string] )
57 [ dup [ empty? ] all? [ drop ] [ , ] if ]
62 : csv-row ( stream -- row )
63 [ row nip ] with-input-stream ;
65 : csv ( stream -- rows )
66 [ [ (csv) ] { } make ] with-input-stream
67 dup last { "" } = [ but-last ] when ;
69 : string>csv ( string -- csv )
72 : file>csv ( path encoding -- csv )
75 : with-delimiter ( ch quot -- )
76 [ delimiter ] dip with-variable ; inline
80 : needs-escaping? ( cell -- ? )
82 dup "\n\"" member? [ drop t ] [ _ = ] if
85 : escape-quotes ( cell -- cell' )
89 [ dup CHAR: " = [ , ] [ drop ] if ] bi
93 : enclose-in-quotes ( cell -- cell' )
94 "\"" dup surround ; inline
96 : escape-if-required ( cell -- cell' )
98 [ escape-quotes enclose-in-quotes ] when ; inline
102 : write-row ( row -- )
103 delimiter> '[ _ write1 ]
104 [ escape-if-required write ] interleave nl ; inline
108 : (write-csv) ( rows -- )
113 : write-csv ( rows stream -- )
114 [ (write-csv) ] with-output-stream ;
116 : csv>string ( csv -- string )
117 [ (write-csv) ] with-string-writer ;
119 : csv>file ( rows path encoding -- ) <file-writer> write-csv ;