1 ! Copyright (C) 2008, 2009 Doug Coleman, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators io.streams.string
4 kernel lists math math.order namespaces sequences splitting
5 strings urls urls.encoding xml.data xml.syntax xml.writer
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 >url protocol>> >boolean ;
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 + cramp 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 : parse-big-link ( before after -- link rest )
87 [ [ CHAR: [ suffix ] [ (parse-paragraph) ] bi* ]
90 : escape ( before after -- before' after' )
91 [ nil ] [ unclip-slice swap [ suffix ] dip (parse-paragraph) ] if-empty ;
93 : (parse-paragraph) ( string -- list )
95 [ "*_^~%[\\" member? ] find-cut [
97 { CHAR: [ [ parse-big-link ] }
98 { CHAR: \\ [ escape ] }
99 [ dup delimiter-class parse-delimiter ]
101 ] [ drop "" like 1list ] if*
104 : look ( state i -- char ) swap first ?nth ;
106 : take-lines ( state char -- state' lines )
107 dupd '[ ?first _ = not ] find drop
108 [ cut-slice ] [ f ] if* swap ;
110 :: (take-until) ( state delimiter accum -- string/f state' )
111 state empty? [ accum join-lines f ] [
112 state unclip-slice :> ( rest first )
113 first delimiter split1 :> ( before after )
119 rest delimiter accum (take-until)
123 : take-until ( state delimiter -- string state'/f )
124 V{ } clone (take-until) ;
126 : count= ( string -- n )
127 dup <reversed> [ [ CHAR: = = not ] find drop 0 or ] bi@ min ;
129 : trim= ( string -- string' )
132 : make-heading ( string class -- heading )
133 [ trim= parse-paragraph ] dip boa ; inline
135 : parse-heading ( state -- state' heading )
136 unclip-slice dup count= {
137 { 0 [ make-paragraph ] }
138 { 1 [ heading1 make-heading ] }
139 { 2 [ heading2 make-heading ] }
140 { 3 [ heading3 make-heading ] }
141 { 4 [ heading4 make-heading ] }
142 [ drop heading4 make-heading ]
145 : trim-row ( seq -- seq' )
147 dup last empty? [ but-last ] when ;
149 : coalesce ( rows -- rows' )
152 _ dup ?last ?last CHAR: \\ =
153 [ [ pop "|" rot 3append ] keep ] when
158 : parse-table ( state -- state' table )
163 [ parse-paragraph ] map
167 : parse-line ( state -- state' item )
168 unclip-slice dup "___" =
169 [ drop line new ] [ make-paragraph ] if ;
171 : parse-list ( state char class -- state' list )
174 [ rest parse-paragraph list-item boa ] map
177 : parse-ul ( state -- state' ul )
178 CHAR: - unordered-list parse-list ;
180 : parse-ol ( state -- state' ul )
181 CHAR: # ordered-list parse-list ;
183 : parse-code ( state -- state' item )
185 [ unclip-slice make-paragraph ] [
189 [ code boa ] dip swap
190 ] [ drop unclip-slice make-paragraph ] if*
193 : parse-item ( state -- state' item )
195 { CHAR: = [ parse-heading ] }
196 { CHAR: | [ parse-table ] }
197 { CHAR: _ [ parse-line ] }
198 { CHAR: - [ parse-ul ] }
199 { CHAR: # [ parse-ol ] }
200 { CHAR: [ [ parse-code ] }
201 { f [ rest-slice f ] }
202 [ drop unclip-slice make-paragraph ]
205 : parse-farkup ( string -- farkup )
206 split-lines [ dup empty? not ] [ parse-item ] produce nip sift ;
208 CONSTANT: invalid-url "javascript:alert('Invalid URL in farkup');"
210 : check-url ( href -- href' absolute? )
212 { [ dup empty? ] [ drop invalid-url f ] }
213 { [ dup [ 127 > ] any? ] [ drop invalid-url f ] }
214 { [ dup first "/\\" member? ] [ drop invalid-url f ] }
215 { [ CHAR: : over member? ] [ dup absolute-url? [ t ] [ drop invalid-url f ] if ] }
216 [ relative-link-prefix get prepend "" like url-encode f ]
219 : render-code ( string mode -- xml )
220 [ split-lines ] dip htmlize-lines
221 [XML <pre><-></pre> XML] ;
223 GENERIC: (write-farkup) ( farkup -- xml )
225 : farkup-inside ( farkup name -- xml )
226 <simple-name> swap T{ attrs } swap
227 child>> (write-farkup) 1array <tag> ;
229 M: heading1 (write-farkup) "h1" farkup-inside ;
230 M: heading2 (write-farkup) "h2" farkup-inside ;
231 M: heading3 (write-farkup) "h3" farkup-inside ;
232 M: heading4 (write-farkup) "h4" farkup-inside ;
233 M: strong (write-farkup) "strong" farkup-inside ;
234 M: emphasis (write-farkup) "em" farkup-inside ;
235 M: superscript (write-farkup) "sup" farkup-inside ;
236 M: subscript (write-farkup) "sub" farkup-inside ;
237 M: inline-code (write-farkup) "code" farkup-inside ;
238 M: list-item (write-farkup) "li" farkup-inside ;
239 M: unordered-list (write-farkup) "ul" farkup-inside ;
240 M: ordered-list (write-farkup) "ol" farkup-inside ;
241 M: paragraph (write-farkup) "p" farkup-inside ;
242 M: table (write-farkup) "table" farkup-inside ;
244 : write-link ( href text -- xml )
245 [ check-url link-no-follow? get "nofollow" and and ] dip
246 [XML <a href=<-> rel=<->><-></a> XML] ;
248 : write-image-link ( href text -- xml )
249 disable-images? get [
251 [XML <strong>Images are not allowed</strong> XML]
253 [ check-url drop ] [ f like ] bi*
254 [XML <img src=<-> alt=<->/> XML]
257 : open-link ( link -- href text )
258 [ href>> ] [ text>> (write-farkup) ] bi ;
260 M: link (write-farkup)
261 open-link write-link ;
263 M: image (write-farkup)
264 open-link write-image-link ;
266 M: code (write-farkup)
267 [ string>> ] [ mode>> ] bi render-code ;
269 M: line (write-farkup)
270 drop [XML <hr/> XML] ;
272 M: line-break (write-farkup)
273 drop [XML <br/> XML] ;
275 M: table-row (write-farkup)
277 [ (write-farkup) [XML <td><-></td> XML] ] map
278 [XML <tr><-></tr> XML] ;
280 M: string (write-farkup) ;
282 M: array (write-farkup) [ (write-farkup) ] map ;
284 : farkup>xml ( string -- xml )
285 parse-farkup (write-farkup) ;
287 : write-farkup ( string -- )
288 farkup>xml write-xml ;
290 : convert-farkup ( string -- string' )
291 [ write-farkup ] with-string-writer ;