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 : maybe-escaped-quote ( -- endchar )
29 { CHAR: " [ , quoted-field ] }
32 [ 2drop skip-to-field-end ]
35 : quoted-field ( -- endchar )
37 drop % maybe-escaped-quote ;
39 : field ( -- sep string )
40 delimiter> (quoted-field) read-until
42 2drop [ quoted-field ] "" make
49 [ [ blank? ] trim ] when
54 f delimiter> '[ dup _ = ]
55 [ drop field , ] do while ;
57 : row ( -- eof? array[string] )
61 [ dup [ empty? ] all? [ drop ] [ , ] if ]
66 : csv-row ( stream -- row )
67 [ row nip ] with-input-stream ;
69 : csv ( stream -- rows )
70 [ [ (csv) ] { } make ] with-input-stream
71 dup last { "" } = [ but-last ] when ;
73 : string>csv ( string -- csv )
76 : file>csv ( path encoding -- csv )
79 : with-delimiter ( ch quot -- )
80 [ delimiter ] dip with-variable ; inline
84 : needs-escaping? ( cell -- ? )
86 dup "\n\"" member? [ drop t ] [ _ = ] if
89 : escape-quotes ( cell -- cell' )
93 [ dup CHAR: " = [ , ] [ drop ] if ] bi
97 : enclose-in-quotes ( cell -- cell' )
98 "\"" dup surround ; inline
100 : escape-if-required ( cell -- cell' )
102 [ escape-quotes enclose-in-quotes ] when ; inline
106 : write-row ( row -- )
107 delimiter> '[ _ write1 ]
108 [ escape-if-required write ] interleave nl ; inline
112 : (write-csv) ( rows -- )
117 : write-csv ( rows stream -- )
118 [ (write-csv) ] with-output-stream ;
120 : csv>string ( csv -- string )
121 [ (write-csv) ] with-string-writer ;
123 : csv>file ( rows path encoding -- ) <file-writer> write-csv ;