1 ! Copyright (C) 2008, 2009 Doug Coleman, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: sequences kernel splitting lists fry accessors assocs math.order
4 math combinators namespaces urls.encoding xml.syntax xmode.code2html
5 xml.data arrays strings vectors xml.writer io.streams.string locals
7 FROM: namespaces => set ;
10 SYMBOL: relative-link-prefix
11 SYMBOL: disable-images?
12 SYMBOL: link-no-follow?
15 TUPLE: heading1 child ;
16 TUPLE: heading2 child ;
17 TUPLE: heading3 child ;
18 TUPLE: heading4 child ;
20 TUPLE: emphasis child ;
21 TUPLE: superscript child ;
22 TUPLE: subscript child ;
23 TUPLE: inline-code child ;
24 TUPLE: paragraph child ;
25 TUPLE: list-item child ;
26 TUPLE: unordered-list child ;
27 TUPLE: ordered-list child ;
29 TUPLE: table-row child ;
30 TUPLE: link href text ;
31 TUPLE: image href text ;
32 TUPLE: code mode string ;
36 : absolute-url? ( string -- ? )
37 { "http://" "https://" "ftp://" } [ head? ] with any? ;
39 : simple-link-title ( string -- string' )
40 dup absolute-url? [ "/" split1-last swap or ] unless ;
42 ! _foo*bar_baz*bing works like <i>foo*bar</i>baz<b>bing</b>
43 ! I could support overlapping, but there's not a good use case for it.
45 DEFER: (parse-paragraph)
47 : parse-paragraph ( string -- seq )
48 (parse-paragraph) list>array ;
50 : make-paragraph ( string -- paragraph )
51 parse-paragraph paragraph boa ;
53 : cut-half-slice ( string i -- before after-slice )
54 [ head ] [ 1 + short tail-slice ] 2bi ;
56 : find-cut ( string quot -- before after delimiter )
58 [ [ cut-half-slice ] [ f ] if* ] dip ; inline
60 : parse-delimiter ( string delimiter class -- paragraph )
61 [ '[ _ = ] find-cut drop ] dip
62 '[ parse-paragraph _ new swap >>child ]
63 [ (parse-paragraph) ] bi* cons ;
65 : delimiter-class ( delimiter -- class )
69 { CHAR: ^ superscript }
71 { CHAR: % inline-code }
74 : or-simple-title ( ... url title/f quot: ( ... title -- ... title' ) -- ... url title' )
75 [ "" like dup simple-link-title ] if* ; inline
77 : parse-link ( string -- paragraph-list )
78 rest-slice "]]" split1-slice [
80 [ "image:" ?head ] dip swap
81 [ [ ] or-simple-title image boa ]
82 [ [ parse-paragraph ] or-simple-title link boa ] if
83 ] dip [ (parse-paragraph) cons ] [ 1list ] if* ;
85 : ?first ( seq -- elt ) 0 swap ?nth ;
87 : parse-big-link ( before after -- link rest )
90 [ [ CHAR: [ suffix ] [ (parse-paragraph) ] bi* ]
93 : escape ( before after -- before' after' )
94 [ nil ] [ unclip-slice swap [ suffix ] dip (parse-paragraph) ] if-empty ;
96 : (parse-paragraph) ( string -- list )
98 [ "*_^~%[\\" member? ] find-cut [
100 { CHAR: [ [ parse-big-link ] }
101 { CHAR: \\ [ escape ] }
102 [ dup delimiter-class parse-delimiter ]
104 ] [ drop "" like 1list ] if*
107 : <farkup-state> ( string -- state ) string-lines ;
108 : look ( state i -- char ) swap first ?nth ;
109 : done? ( state -- ? ) empty? ;
110 : take-line ( state -- state' line ) unclip-slice ;
112 : take-lines ( state char -- state' lines )
113 dupd '[ ?first _ = not ] find drop
114 [ cut-slice ] [ f ] if* swap ;
116 :: (take-until) ( state delimiter accum -- string/f state' )
117 state empty? [ accum "\n" join f ] [
118 state unclip-slice :> ( rest first )
119 first delimiter split1 :> ( before after )
125 rest delimiter accum (take-until)
129 : take-until ( state delimiter -- string state'/f )
130 V{ } clone (take-until) ;
132 : count= ( string -- n )
133 dup <reversed> [ [ CHAR: = = not ] find drop 0 or ] bi@ min ;
135 : trim= ( string -- string' )
138 : make-heading ( string class -- heading )
139 [ trim= parse-paragraph ] dip boa ; inline
141 : parse-heading ( state -- state' heading )
142 take-line dup count= {
143 { 0 [ make-paragraph ] }
144 { 1 [ heading1 make-heading ] }
145 { 2 [ heading2 make-heading ] }
146 { 3 [ heading3 make-heading ] }
147 { 4 [ heading4 make-heading ] }
148 [ drop heading4 make-heading ]
151 : trim-row ( seq -- seq' )
153 dup last empty? [ but-last ] when ;
155 : ?last ( seq -- elt/f )
156 [ f ] [ last ] if-empty ;
158 : coalesce ( rows -- rows' )
161 _ dup ?last ?last CHAR: \\ =
162 [ [ pop "|" rot 3append ] keep ] when
167 : parse-table ( state -- state' table )
172 [ parse-paragraph ] map
176 : parse-line ( state -- state' item )
177 take-line dup "___" =
178 [ drop line new ] [ make-paragraph ] if ;
180 : parse-list ( state char class -- state' list )
183 [ rest parse-paragraph list-item boa ] map
186 : parse-ul ( state -- state' ul )
187 CHAR: - unordered-list parse-list ;
189 : parse-ol ( state -- state' ul )
190 CHAR: # ordered-list parse-list ;
192 : parse-code ( state -- state' item )
194 [ take-line make-paragraph ] [
198 [ code boa ] dip swap
199 ] [ drop take-line make-paragraph ] if*
202 : parse-item ( state -- state' item )
204 { CHAR: = [ parse-heading ] }
205 { CHAR: | [ parse-table ] }
206 { CHAR: _ [ parse-line ] }
207 { CHAR: - [ parse-ul ] }
208 { CHAR: # [ parse-ol ] }
209 { CHAR: [ [ parse-code ] }
210 { f [ rest-slice f ] }
211 [ drop take-line make-paragraph ]
214 : parse-farkup ( string -- farkup )
215 <farkup-state> [ dup done? not ] [ parse-item ] produce nip sift ;
217 CONSTANT: invalid-url "javascript:alert('Invalid URL in farkup');"
219 : check-url ( href -- href' )
221 { [ dup empty? ] [ drop invalid-url ] }
222 { [ dup [ 127 > ] any? ] [ drop invalid-url ] }
223 { [ dup first "/\\" member? ] [ drop invalid-url ] }
224 { [ CHAR: : over member? ] [ dup absolute-url? [ drop invalid-url ] unless ] }
225 [ relative-link-prefix get prepend "" like url-encode ]
228 : render-code ( string mode -- xml )
229 [ string-lines ] dip htmlize-lines
230 [XML <pre><-></pre> XML] ;
232 GENERIC: (write-farkup) ( farkup -- xml )
234 : farkup-inside ( farkup name -- xml )
235 <simple-name> swap T{ attrs } swap
236 child>> (write-farkup) 1array <tag> ;
238 M: heading1 (write-farkup) "h1" farkup-inside ;
239 M: heading2 (write-farkup) "h2" farkup-inside ;
240 M: heading3 (write-farkup) "h3" farkup-inside ;
241 M: heading4 (write-farkup) "h4" farkup-inside ;
242 M: strong (write-farkup) "strong" farkup-inside ;
243 M: emphasis (write-farkup) "em" farkup-inside ;
244 M: superscript (write-farkup) "sup" farkup-inside ;
245 M: subscript (write-farkup) "sub" farkup-inside ;
246 M: inline-code (write-farkup) "code" farkup-inside ;
247 M: list-item (write-farkup) "li" farkup-inside ;
248 M: unordered-list (write-farkup) "ul" farkup-inside ;
249 M: ordered-list (write-farkup) "ol" farkup-inside ;
250 M: paragraph (write-farkup) "p" farkup-inside ;
251 M: table (write-farkup) "table" farkup-inside ;
253 : write-link ( href text -- xml )
254 [ check-url link-no-follow? get "nofollow" and ] dip
255 [XML <a href=<-> rel=<->><-></a> XML] ;
257 : write-image-link ( href text -- xml )
258 disable-images? get [
260 [XML <strong>Images are not allowed</strong> XML]
262 [ check-url ] [ f like ] bi*
263 [XML <img src=<-> alt=<->/> XML]
266 : open-link ( link -- href text )
267 [ href>> ] [ text>> (write-farkup) ] bi ;
269 M: link (write-farkup)
270 open-link write-link ;
272 M: image (write-farkup)
273 open-link write-image-link ;
275 M: code (write-farkup)
276 [ string>> ] [ mode>> ] bi render-code ;
278 M: line (write-farkup)
279 drop [XML <hr/> XML] ;
281 M: line-break (write-farkup)
282 drop [XML <br/> XML] ;
284 M: table-row (write-farkup)
286 [ (write-farkup) [XML <td><-></td> XML] ] map
287 [XML <tr><-></tr> XML] ;
289 M: string (write-farkup) ;
291 M: array (write-farkup) [ (write-farkup) ] map ;
293 : farkup>xml ( string -- xml )
294 parse-farkup (write-farkup) ;
296 : write-farkup ( string -- )
297 farkup>xml write-xml ;
299 : convert-farkup ( string -- string' )
300 [ write-farkup ] with-string-writer ;