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
9 SYMBOL: relative-link-prefix
10 SYMBOL: disable-images?
11 SYMBOL: link-no-follow?
14 TUPLE: heading1 child ;
15 TUPLE: heading2 child ;
16 TUPLE: heading3 child ;
17 TUPLE: heading4 child ;
19 TUPLE: emphasis child ;
20 TUPLE: superscript child ;
21 TUPLE: subscript child ;
22 TUPLE: inline-code child ;
23 TUPLE: paragraph child ;
24 TUPLE: list-item child ;
25 TUPLE: unordered-list child ;
26 TUPLE: ordered-list child ;
28 TUPLE: table-row child ;
29 TUPLE: link href text ;
30 TUPLE: image href text ;
31 TUPLE: code mode string ;
35 : absolute-url? ( string -- ? )
36 { "http://" "https://" "ftp://" } [ head? ] with any? ;
38 : simple-link-title ( string -- string' )
39 dup absolute-url? [ "/" split1-last swap or ] unless ;
41 ! _foo*bar_baz*bing works like <i>foo*bar</i>baz<b>bing</b>
42 ! I could support overlapping, but there's not a good use case for it.
44 DEFER: (parse-paragraph)
46 : parse-paragraph ( string -- seq )
47 (parse-paragraph) list>array ;
49 : make-paragraph ( string -- paragraph )
50 parse-paragraph paragraph boa ;
52 : cut-half-slice ( string i -- before after-slice )
53 [ head ] [ 1 + short tail-slice ] 2bi ;
55 : find-cut ( string quot -- before after delimiter )
57 [ [ cut-half-slice ] [ f ] if* ] dip ; inline
59 : parse-delimiter ( string delimiter class -- paragraph )
60 [ '[ _ = ] find-cut drop ] dip
61 '[ parse-paragraph _ new swap >>child ]
62 [ (parse-paragraph) ] bi* cons ;
64 : delimiter-class ( delimiter -- class )
68 { CHAR: ^ superscript }
70 { CHAR: % inline-code }
73 : or-simple-title ( url title/f quot: ( title -- title' ) -- url title' )
74 [ "" like dup simple-link-title ] if* ; inline
76 : parse-link ( string -- paragraph-list )
77 rest-slice "]]" split1-slice [
79 [ "image:" ?head ] dip swap
80 [ [ ] or-simple-title image boa ]
81 [ [ parse-paragraph ] or-simple-title link boa ] if
82 ] dip [ (parse-paragraph) cons ] [ 1list ] if* ;
84 : ?first ( seq -- elt ) 0 swap ?nth ;
86 : parse-big-link ( before after -- link rest )
89 [ [ CHAR: [ suffix ] [ (parse-paragraph) ] bi* ]
92 : escape ( before after -- before' after' )
93 [ nil ] [ unclip-slice swap [ suffix ] dip (parse-paragraph) ] if-empty ;
95 : (parse-paragraph) ( string -- list )
97 [ "*_^~%[\\" member? ] find-cut [
99 { CHAR: [ [ parse-big-link ] }
100 { CHAR: \\ [ escape ] }
101 [ dup delimiter-class parse-delimiter ]
103 ] [ drop "" like 1list ] if*
106 : <farkup-state> ( string -- state ) string-lines ;
107 : look ( state i -- char ) swap first ?nth ;
108 : done? ( state -- ? ) empty? ;
109 : take-line ( state -- state' line ) unclip-slice ;
111 : take-lines ( state char -- state' lines )
112 dupd '[ ?first _ = not ] find drop
113 [ cut-slice ] [ f ] if* swap ;
115 :: (take-until) ( state delimiter accum -- string/f state' )
116 state empty? [ accum "\n" join f ] [
117 state unclip-slice :> first :> rest
118 first delimiter split1 :> after :> before
124 rest delimiter accum (take-until)
128 : take-until ( state delimiter -- string state'/f )
129 V{ } clone (take-until) ;
131 : count= ( string -- n )
132 dup <reversed> [ [ CHAR: = = not ] find drop 0 or ] bi@ min ;
134 : trim= ( string -- string' )
137 : make-heading ( string class -- heading )
138 [ trim= parse-paragraph ] dip boa ; inline
140 : parse-heading ( state -- state' heading )
141 take-line dup count= {
142 { 0 [ make-paragraph ] }
143 { 1 [ heading1 make-heading ] }
144 { 2 [ heading2 make-heading ] }
145 { 3 [ heading3 make-heading ] }
146 { 4 [ heading4 make-heading ] }
147 [ drop heading4 make-heading ]
150 : trim-row ( seq -- seq' )
152 dup last empty? [ but-last ] when ;
154 : ?last ( seq -- elt/f )
155 [ f ] [ last ] if-empty ;
157 : coalesce ( rows -- rows' )
160 _ dup ?last ?last CHAR: \\ =
161 [ [ pop "|" rot 3append ] keep ] when
166 : parse-table ( state -- state' table )
171 [ parse-paragraph ] map
175 : parse-line ( state -- state' item )
176 take-line dup "___" =
177 [ drop line new ] [ make-paragraph ] if ;
179 : parse-list ( state char class -- state' list )
182 [ rest parse-paragraph list-item boa ] map
185 : parse-ul ( state -- state' ul )
186 CHAR: - unordered-list parse-list ;
188 : parse-ol ( state -- state' ul )
189 CHAR: # ordered-list parse-list ;
191 : parse-code ( state -- state' item )
193 [ take-line make-paragraph ] [
197 [ code boa ] dip swap
198 ] [ drop take-line make-paragraph ] if*
201 : parse-item ( state -- state' item )
203 { CHAR: = [ parse-heading ] }
204 { CHAR: | [ parse-table ] }
205 { CHAR: _ [ parse-line ] }
206 { CHAR: - [ parse-ul ] }
207 { CHAR: # [ parse-ol ] }
208 { CHAR: [ [ parse-code ] }
209 { f [ rest-slice f ] }
210 [ drop take-line make-paragraph ]
213 : parse-farkup ( string -- farkup )
214 <farkup-state> [ dup done? not ] [ parse-item ] produce nip sift ;
216 CONSTANT: invalid-url "javascript:alert('Invalid URL in farkup');"
218 : check-url ( href -- href' )
220 { [ dup empty? ] [ drop invalid-url ] }
221 { [ dup [ 127 > ] any? ] [ drop invalid-url ] }
222 { [ dup first "/\\" member? ] [ drop invalid-url ] }
223 { [ CHAR: : over member? ] [ dup absolute-url? [ drop invalid-url ] unless ] }
224 [ relative-link-prefix get prepend "" like url-encode ]
227 : render-code ( string mode -- xml )
228 [ string-lines ] dip htmlize-lines
229 [XML <pre><-></pre> XML] ;
231 GENERIC: (write-farkup) ( farkup -- xml )
233 : farkup-inside ( farkup name -- xml )
234 <simple-name> swap T{ attrs } swap
235 child>> (write-farkup) 1array <tag> ;
237 M: heading1 (write-farkup) "h1" farkup-inside ;
238 M: heading2 (write-farkup) "h2" farkup-inside ;
239 M: heading3 (write-farkup) "h3" farkup-inside ;
240 M: heading4 (write-farkup) "h4" farkup-inside ;
241 M: strong (write-farkup) "strong" farkup-inside ;
242 M: emphasis (write-farkup) "em" farkup-inside ;
243 M: superscript (write-farkup) "sup" farkup-inside ;
244 M: subscript (write-farkup) "sub" farkup-inside ;
245 M: inline-code (write-farkup) "code" farkup-inside ;
246 M: list-item (write-farkup) "li" farkup-inside ;
247 M: unordered-list (write-farkup) "ul" farkup-inside ;
248 M: ordered-list (write-farkup) "ol" farkup-inside ;
249 M: paragraph (write-farkup) "p" farkup-inside ;
250 M: table (write-farkup) "table" farkup-inside ;
252 : write-link ( href text -- xml )
253 [ check-url link-no-follow? get "nofollow" and ] dip
254 [XML <a href=<-> rel=<->><-></a> XML] ;
256 : write-image-link ( href text -- xml )
257 disable-images? get [
259 [XML <strong>Images are not allowed</strong> XML]
261 [ check-url ] [ f like ] bi*
262 [XML <img src=<-> alt=<->/> XML]
265 : open-link ( link -- href text )
266 [ href>> ] [ text>> (write-farkup) ] bi ;
268 M: link (write-farkup)
269 open-link write-link ;
271 M: image (write-farkup)
272 open-link write-image-link ;
274 M: code (write-farkup)
275 [ string>> ] [ mode>> ] bi render-code ;
277 M: line (write-farkup)
278 drop [XML <hr/> XML] ;
280 M: line-break (write-farkup)
281 drop [XML <br/> XML] ;
283 M: table-row (write-farkup)
285 [ (write-farkup) [XML <td><-></td> XML] ] map
286 [XML <tr><-></tr> XML] ;
288 M: string (write-farkup) ;
290 M: array (write-farkup) [ (write-farkup) ] map ;
292 : farkup>xml ( string -- xml )
293 parse-farkup (write-farkup) ;
295 : write-farkup ( string -- )
296 farkup>xml write-xml ;
298 : convert-farkup ( string -- string' )
299 [ write-farkup ] with-string-writer ;