1 ! Copyright (C) 2005, 2009 Daniel Ehrenberg, Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: namespaces math kernel sequences accessors fry circular
4 unicode.case unicode.categories locals combinators.short-circuit
5 make combinators io splitting math.parser ;
8 TUPLE: sequence-parser sequence n ;
10 : <sequence-parser> ( sequence -- sequence-parser )
15 :: with-sequence-parser ( sequence-parser quot -- seq/f )
16 sequence-parser n>> :> n
17 sequence-parser quot call [
18 n sequence-parser (>>n) f
21 : offset ( sequence-parser offset -- char/f )
23 [ n>> + ] [ sequence>> ?nth ] bi ; inline
25 : current ( sequence-parser -- char/f ) 0 offset ; inline
27 : previous ( sequence-parser -- char/f ) -1 offset ; inline
29 : peek-next ( sequence-parser -- char/f ) 1 offset ; inline
31 : advance ( sequence-parser -- sequence-parser )
32 [ 1 + ] change-n ; inline
34 : advance* ( sequence-parser -- )
37 : get+increment ( sequence-parser -- char/f )
38 [ current ] [ advance drop ] bi ; inline
40 :: skip-until ( sequence-parser quot: ( obj -- ? ) -- )
41 sequence-parser current [
42 sequence-parser quot call
43 [ sequence-parser advance quot skip-until ] unless
44 ] when ; inline recursive
46 : sequence-parse-end? ( sequence-parser -- ? ) current not ;
48 : take-until ( sequence-parser quot: ( obj -- ? ) -- sequence/f )
49 over sequence-parse-end? [
54 [ drop [ n>> ] [ sequence>> ] bi ] 2tri subseq
57 : take-while ( sequence-parser quot: ( obj -- ? ) -- sequence/f )
58 [ not ] compose take-until ; inline
60 : <safe-slice> ( from to seq -- slice/f )
63 [ [ drop ] 2dip length > ]
65 } 3|| [ 3drop f ] [ slice boa ] if ; inline
67 :: take-sequence ( sequence-parser sequence -- obj/f )
68 sequence-parser [ n>> dup sequence length + ] [ sequence>> ] bi
69 <safe-slice> sequence sequence= [
71 sequence-parser [ sequence length + ] change-n drop
76 : take-sequence* ( sequence-parser sequence -- )
79 :: take-until-sequence ( sequence-parser sequence -- sequence'/f )
80 sequence-parser n>> :> saved
81 sequence length <growing-circular> :> growing
84 current growing push-growing-circular
85 sequence growing sequence=
87 growing sequence sequence= [
89 growing length 1- - head
90 sequence-parser [ growing length - 1 + ] change-n drop
91 ! sequence-parser advance drop
93 saved sequence-parser (>>n)
97 :: take-until-sequence* ( sequence-parser sequence -- sequence'/f )
98 sequence-parser sequence take-until-sequence :> out
100 sequence-parser [ sequence length + ] change-n drop
103 : skip-whitespace ( sequence-parser -- sequence-parser )
104 [ [ current blank? not ] take-until drop ] keep ;
106 : take-rest-slice ( sequence-parser -- sequence/f )
107 [ sequence>> ] [ n>> ] bi
108 2dup [ length ] dip < [ 2drop f ] [ tail-slice ] if ; inline
110 : take-rest ( sequence-parser -- sequence )
111 [ take-rest-slice ] [ sequence>> like ] bi ;
113 : take-until-object ( sequence-parser obj -- sequence )
114 '[ current _ = ] take-until ;
116 : parse-sequence ( sequence quot -- )
117 [ <sequence-parser> ] dip call ; inline
119 :: take-quoted-string ( sequence-parser escape-char quote-char -- string )
120 sequence-parser n>> :> start-n
121 sequence-parser advance
124 [ { [ previous escape-char = ] [ current quote-char = ] } 1&& ]
125 [ current quote-char = not ]
127 ] take-while :> string
128 sequence-parser current quote-char = [
129 sequence-parser advance* string
131 start-n sequence-parser (>>n) f
134 : (take-token) ( sequence-parser -- string )
135 skip-whitespace [ current { [ blank? ] [ f = ] } 1|| ] take-until ;
137 :: take-token* ( sequence-parser escape-char quote-char -- string/f )
138 sequence-parser skip-whitespace
140 { quote-char [ escape-char quote-char take-quoted-string ] }
142 [ drop (take-token) ]
145 : take-token ( sequence-parser -- string/f )
146 CHAR: \ CHAR: " take-token* ;
148 : take-integer ( sequence-parser -- n/f )
149 [ current digit? ] take-while string>number ;
151 :: take-n ( sequence-parser n -- seq/f )
152 n sequence-parser [ n>> + ] [ sequence>> length ] bi > [
155 sequence-parser n>> dup n + sequence-parser sequence>> subseq
156 sequence-parser [ n + ] change-n drop
159 : take-c-comment ( sequence-parser -- seq/f )
161 dup "/*" take-sequence [
162 "*/" take-until-sequence*
166 ] with-sequence-parser ;
168 : write-full ( sequence-parser -- ) sequence>> write ;
169 : write-rest ( sequence-parser -- ) take-rest write ;