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 : parse-big-link ( before after -- link rest )
88 [ [ CHAR: [ suffix ] [ (parse-paragraph) ] bi* ]
91 : escape ( before after -- before' after' )
92 [ nil ] [ unclip-slice swap [ suffix ] dip (parse-paragraph) ] if-empty ;
94 : (parse-paragraph) ( string -- list )
96 [ "*_^~%[\\" member? ] find-cut [
98 { CHAR: [ [ parse-big-link ] }
99 { CHAR: \\ [ escape ] }
100 [ dup delimiter-class parse-delimiter ]
102 ] [ drop "" like 1list ] if*
105 : look ( state i -- char ) swap first ?nth ;
107 : take-lines ( state char -- state' lines )
108 dupd '[ ?first _ = not ] find drop
109 [ cut-slice ] [ f ] if* swap ;
111 :: (take-until) ( state delimiter accum -- string/f state' )
112 state empty? [ accum "\n" join f ] [
113 state unclip-slice :> ( rest first )
114 first delimiter split1 :> ( before after )
120 rest delimiter accum (take-until)
124 : take-until ( state delimiter -- string state'/f )
125 V{ } clone (take-until) ;
127 : count= ( string -- n )
128 dup <reversed> [ [ CHAR: = = not ] find drop 0 or ] bi@ min ;
130 : trim= ( string -- string' )
133 : make-heading ( string class -- heading )
134 [ trim= parse-paragraph ] dip boa ; inline
136 : parse-heading ( state -- state' heading )
137 unclip-slice dup count= {
138 { 0 [ make-paragraph ] }
139 { 1 [ heading1 make-heading ] }
140 { 2 [ heading2 make-heading ] }
141 { 3 [ heading3 make-heading ] }
142 { 4 [ heading4 make-heading ] }
143 [ drop heading4 make-heading ]
146 : trim-row ( seq -- seq' )
148 dup last empty? [ but-last ] when ;
150 : coalesce ( rows -- rows' )
153 _ dup ?last ?last CHAR: \\ =
154 [ [ pop "|" rot 3append ] keep ] when
159 : parse-table ( state -- state' table )
164 [ parse-paragraph ] map
168 : parse-line ( state -- state' item )
169 unclip-slice dup "___" =
170 [ drop line new ] [ make-paragraph ] if ;
172 : parse-list ( state char class -- state' list )
175 [ rest parse-paragraph list-item boa ] map
178 : parse-ul ( state -- state' ul )
179 CHAR: - unordered-list parse-list ;
181 : parse-ol ( state -- state' ul )
182 CHAR: # ordered-list parse-list ;
184 : parse-code ( state -- state' item )
186 [ unclip-slice make-paragraph ] [
190 [ code boa ] dip swap
191 ] [ drop unclip-slice make-paragraph ] if*
194 : parse-item ( state -- state' item )
196 { CHAR: = [ parse-heading ] }
197 { CHAR: | [ parse-table ] }
198 { CHAR: _ [ parse-line ] }
199 { CHAR: - [ parse-ul ] }
200 { CHAR: # [ parse-ol ] }
201 { CHAR: [ [ parse-code ] }
202 { f [ rest-slice f ] }
203 [ drop unclip-slice make-paragraph ]
206 : parse-farkup ( string -- farkup )
207 string-lines [ dup empty? not ] [ parse-item ] produce nip sift ;
209 CONSTANT: invalid-url "javascript:alert('Invalid URL in farkup');"
211 : check-url ( href -- href' )
213 { [ dup empty? ] [ drop invalid-url ] }
214 { [ dup [ 127 > ] any? ] [ drop invalid-url ] }
215 { [ dup first "/\\" member? ] [ drop invalid-url ] }
216 { [ CHAR: : over member? ] [ dup absolute-url? [ drop invalid-url ] unless ] }
217 [ relative-link-prefix get prepend "" like url-encode ]
220 : render-code ( string mode -- xml )
221 [ string-lines ] dip htmlize-lines
222 [XML <pre><-></pre> XML] ;
224 GENERIC: (write-farkup) ( farkup -- xml )
226 : farkup-inside ( farkup name -- xml )
227 <simple-name> swap T{ attrs } swap
228 child>> (write-farkup) 1array <tag> ;
230 M: heading1 (write-farkup) "h1" farkup-inside ;
231 M: heading2 (write-farkup) "h2" farkup-inside ;
232 M: heading3 (write-farkup) "h3" farkup-inside ;
233 M: heading4 (write-farkup) "h4" farkup-inside ;
234 M: strong (write-farkup) "strong" farkup-inside ;
235 M: emphasis (write-farkup) "em" farkup-inside ;
236 M: superscript (write-farkup) "sup" farkup-inside ;
237 M: subscript (write-farkup) "sub" farkup-inside ;
238 M: inline-code (write-farkup) "code" farkup-inside ;
239 M: list-item (write-farkup) "li" farkup-inside ;
240 M: unordered-list (write-farkup) "ul" farkup-inside ;
241 M: ordered-list (write-farkup) "ol" farkup-inside ;
242 M: paragraph (write-farkup) "p" farkup-inside ;
243 M: table (write-farkup) "table" farkup-inside ;
245 : write-link ( href text -- xml )
246 [ check-url link-no-follow? get "nofollow" and ] dip
247 [XML <a href=<-> rel=<->><-></a> XML] ;
249 : write-image-link ( href text -- xml )
250 disable-images? get [
252 [XML <strong>Images are not allowed</strong> XML]
254 [ check-url ] [ f like ] bi*
255 [XML <img src=<-> alt=<->/> XML]
258 : open-link ( link -- href text )
259 [ href>> ] [ text>> (write-farkup) ] bi ;
261 M: link (write-farkup)
262 open-link write-link ;
264 M: image (write-farkup)
265 open-link write-image-link ;
267 M: code (write-farkup)
268 [ string>> ] [ mode>> ] bi render-code ;
270 M: line (write-farkup)
271 drop [XML <hr/> XML] ;
273 M: line-break (write-farkup)
274 drop [XML <br/> XML] ;
276 M: table-row (write-farkup)
278 [ (write-farkup) [XML <td><-></td> XML] ] map
279 [XML <tr><-></tr> XML] ;
281 M: string (write-farkup) ;
283 M: array (write-farkup) [ (write-farkup) ] map ;
285 : farkup>xml ( string -- xml )
286 parse-farkup (write-farkup) ;
288 : write-farkup ( string -- )
289 farkup>xml write-xml ;
291 : convert-farkup ( string -- string' )
292 [ write-farkup ] with-string-writer ;