source/factorcss/CSS.hs

-- Datatypes for CSS

module CSS where
import List

data Stylesheet
        = Stylesheet
                (Maybe String)          -- charset
                [(String, [String])]    -- imports (url, media)
                [Statement]
        deriving Show

data Statement
        = Ruleset [Selector] [Declaration]
        | Media [String] [Statement]
        | Page (Maybe String) [Declaration]
        deriving Show

type Selector
        = [(SimpleSelector, Combinator)]

type SimpleSelector
        = (Maybe String, [Detail])

data Detail
        = Id String
        | Class String
        | Attrib String
        | AttribEq String String
        | AttribInc String String
        | AttribDM String String
        | Pseudo String
        | PseudoFunc String String
        deriving Show

data Combinator
        = Ancestor
        | Preceded
        | Parent
        | NoMore
        deriving Show

type Declaration
        = (String, [Value], Bool)

data Value
        = Number Float
        | Percentage Float
        | Length String
        | Ems Float
        | Exs Float
        | Angle String
        | Time String
        | Freq String
        | StringV String
        | Ident String
        | Uri String
        | HexColour String
        | Slash
        | Comma
        | Function String [Value]
        deriving Show


is_ruleset :: Statement -> Bool
is_ruleset (Ruleset sels decls) = True
is_ruleset _ = False

is_media :: Statement -> Bool
is_media (Media media stmts) = True
is_media _ = False

is_page :: Statement -> Bool
is_page (Page page decls) = True
is_page _ = False


show_stylesheet :: Stylesheet -> [String]
show_stylesheet (Stylesheet c is ss) = show_charset c ++
                map show_import (reverse is) ++
                map show_statement ss

show_charset :: Maybe String -> [String]
show_charset Nothing = []
show_charset (Just c) = ["@charset " ++ c ++ ";"]

show_import :: (String, [String]) -> String
show_import (url, media) = "@import " ++ url ++ " " ++
                (concat . intersperse ", ") media ++ ";"

show_statement :: Statement -> String
show_statement (Ruleset ss ds) =
                show_selectors ss ++
                " { " ++
                (concat . intersperse "; " . map show_declaration) ds ++
                " }"
show_statement (Media media stmts) =
                "@media " ++ (concat . intersperse ", ") media ++
                " {\n" ++
                (unlines . map ('\t':) . map show_statement) stmts ++
                "}"
show_statement z = "(statement)"

show_selectors :: [Selector] -> String
show_selectors = concat . intersperse ", " . map show_selector

show_selector :: Selector -> String
show_selector [] = ""
show_selector ((ss, c):zs) = show_simple_selector ss ++
                show_combinator c ++
                show_selector zs

show_simple_selector :: SimpleSelector -> String
show_simple_selector (Just s, ds) = s ++ (concat . map show_detail) ds
show_simple_selector (Nothing, ds) = (concat . map show_detail) ds

show_detail :: Detail -> String
show_detail (Id i) = i
show_detail (Class c) = "." ++ c
show_detail (Attrib a) = "[" ++ a ++ "]"
show_detail (AttribEq a v) = "[" ++ a ++ "=" ++ v ++ "]"
show_detail (AttribInc a v) = "[" ++ a ++ "~=" ++ v ++ "]"
show_detail (AttribDM a v) = "[" ++ a ++ "|=" ++ v ++ "]"
show_detail (Pseudo p) = ":" ++ p
show_detail (PseudoFunc f p) = ":" ++ f ++ p ++ ")"

show_combinator :: Combinator -> String
show_combinator Ancestor = " "
show_combinator Preceded = " + "
show_combinator Parent = " > "
show_combinator NoMore = ""

show_declaration :: Declaration -> String
show_declaration (p, vs, i) = p ++ ": " ++ show_values vs ++
                if i then " !important" else ""

show_values :: [Value] -> String
show_values = concat . intersperse " " . map show_value

show_value :: Value -> String
show_value (Number n) = show n
show_value (Percentage p) = show p ++ "%"
show_value (Length l) = l
show_value (Ems e) = show e ++ "em"
show_value (Exs x) = show x ++ "ex"
show_value (Angle a) = a
show_value (Time t) = t
show_value (Freq f) = f
show_value (StringV s) = s
show_value (Ident i) = i
show_value (Uri u) = u
show_value (HexColour c) = c
show_value Slash = "/"
show_value Comma = ","
show_value (Function f vs) = f ++ show_values vs ++ ")"
1	-- Datatypes for CSS
2
3	module CSS where
4	import List
5
6	data Stylesheet
7	= Stylesheet
8	(Maybe String) -- charset
9	[(String, [String])] -- imports (url, media)
10	[Statement]
11	deriving Show
12
13	data Statement
14	= Ruleset [Selector] [Declaration]
15	\| Media [String] [Statement]
16	\| Page (Maybe String) [Declaration]
17	deriving Show
18
19	type Selector
20	= [(SimpleSelector, Combinator)]
21
22	type SimpleSelector
23	= (Maybe String, [Detail])
24
25	data Detail
26	= Id String
27	\| Class String
28	\| Attrib String
29	\| AttribEq String String
30	\| AttribInc String String
31	\| AttribDM String String
32	\| Pseudo String
33	\| PseudoFunc String String
34	deriving Show
35
36	data Combinator
37	= Ancestor
38	\| Preceded
39	\| Parent
40	\| NoMore
41	deriving Show
42
43	type Declaration
44	= (String, [Value], Bool)
45
46	data Value
47	= Number Float
48	\| Percentage Float
49	\| Length String
50	\| Ems Float
51	\| Exs Float
52	\| Angle String
53	\| Time String
54	\| Freq String
55	\| StringV String
56	\| Ident String
57	\| Uri String
58	\| HexColour String
59	\| Slash
60	\| Comma
61	\| Function String [Value]
62	deriving Show
63
64
65	is_ruleset :: Statement -> Bool
66	is_ruleset (Ruleset sels decls) = True
67	is_ruleset _ = False
68
69	is_media :: Statement -> Bool
70	is_media (Media media stmts) = True
71	is_media _ = False
72
73	is_page :: Statement -> Bool
74	is_page (Page page decls) = True
75	is_page _ = False
76
77
78	show_stylesheet :: Stylesheet -> [String]
79	show_stylesheet (Stylesheet c is ss) = show_charset c ++
80	map show_import (reverse is) ++
81	map show_statement ss
82
83	show_charset :: Maybe String -> [String]
84	show_charset Nothing = []
85	show_charset (Just c) = ["@charset " ++ c ++ ";"]
86
87	show_import :: (String, [String]) -> String
88	show_import (url, media) = "@import " ++ url ++ " " ++
89	(concat . intersperse ", ") media ++ ";"
90
91	show_statement :: Statement -> String
92	show_statement (Ruleset ss ds) =
93	show_selectors ss ++
94	" { " ++
95	(concat . intersperse "; " . map show_declaration) ds ++
96	" }"
97	show_statement (Media media stmts) =
98	"@media " ++ (concat . intersperse ", ") media ++
99	" {\n" ++
100	(unlines . map ('\t':) . map show_statement) stmts ++
101	"}"
102	show_statement z = "(statement)"
103
104	show_selectors :: [Selector] -> String
105	show_selectors = concat . intersperse ", " . map show_selector
106
107	show_selector :: Selector -> String
108	show_selector [] = ""
109	show_selector ((ss, c):zs) = show_simple_selector ss ++
110	show_combinator c ++
111	show_selector zs
112
113	show_simple_selector :: SimpleSelector -> String
114	show_simple_selector (Just s, ds) = s ++ (concat . map show_detail) ds
115	show_simple_selector (Nothing, ds) = (concat . map show_detail) ds
116
117	show_detail :: Detail -> String
118	show_detail (Id i) = i
119	show_detail (Class c) = "." ++ c
120	show_detail (Attrib a) = "[" ++ a ++ "]"
121	show_detail (AttribEq a v) = "[" ++ a ++ "=" ++ v ++ "]"
122	show_detail (AttribInc a v) = "[" ++ a ++ "~=" ++ v ++ "]"
123	show_detail (AttribDM a v) = "[" ++ a ++ "\|=" ++ v ++ "]"
124	show_detail (Pseudo p) = ":" ++ p
125	show_detail (PseudoFunc f p) = ":" ++ f ++ p ++ ")"
126
127	show_combinator :: Combinator -> String
128	show_combinator Ancestor = " "
129	show_combinator Preceded = " + "
130	show_combinator Parent = " > "
131	show_combinator NoMore = ""
132
133	show_declaration :: Declaration -> String
134	show_declaration (p, vs, i) = p ++ ": " ++ show_values vs ++
135	if i then " !important" else ""
136
137	show_values :: [Value] -> String
138	show_values = concat . intersperse " " . map show_value
139
140	show_value :: Value -> String
141	show_value (Number n) = show n
142	show_value (Percentage p) = show p ++ "%"
143	show_value (Length l) = l
144	show_value (Ems e) = show e ++ "em"
145	show_value (Exs x) = show x ++ "ex"
146	show_value (Angle a) = a
147	show_value (Time t) = t
148	show_value (Freq f) = f
149	show_value (StringV s) = s
150	show_value (Ident i) = i
151	show_value (Uri u) = u
152	show_value (HexColour c) = c
153	show_value Slash = "/"
154	show_value Comma = ","
155	show_value (Function f vs) = f ++ show_values vs ++ ")"