source/factorcss/Tokeniser.x

--
-- This file is part of FactorCSS
-- Licensed under the MIT License,
--                http://www.opensource.org/licenses/mit-license
-- Copyright 2004 James Bursa <james@semichrome.net>
--

-- Tokeniser for CSS 2.1
-- See CSS 2.1 G.2

{
module Tokeniser where
}

%wrapper "posn"

$h              = [0-9a-f]
$nonascii       = [\x80-\xff]
@unicode        = \\$h{1,6}(\r\n|[\ \t\r\n\f])?
@escape         = @unicode|\\[\x20-\x7e\x80-\xff]
@nmstart        = [_a-zA-Z]|$nonascii|@escape
@nmchar         = [\-_a-zA-Z0-9]|$nonascii|@escape
@nl             = \n|\r\n|\r|\f
@string1        = \"([\t\ \!\#\x24\x25&\x28-\x7e]|\\@nl|\'|$nonascii|@escape|\.)*\"
@string2        = \'([\t\ \!\#\x24\x25&\x28-\x7e]|\\@nl|\"|$nonascii|@escape|\.)*\'
@ident          = @nmstart@nmchar*
@name           = @nmchar+
@num            = [\-\053]?[0-9]+|[0-9]*"."[0-9]+
@string         = @string1|@string2
@url            = ([\!\#\x24\x25&\x2a-\x7e]|$nonascii|@escape)*
$s              = [\ \t\r\n\f]
@w              = $s*
@range          = \?{1,6}|$h(\?{0,5}|$h(\?{0,4}|$h(\?{0,3}|$h(\?{0,2}|$h(\??|$h)))))
$all            = \x00-\xff
@comment        = \/\*$all#\x2a*\*+($all#[\/\x2a]$all#\x2a*\*+)*\/

tokens :-

$s+                     ;
@comment                ;

"<!--"                  ;
"-->"                   ;
"~="                    { \p s -> (INCLUDES, p) }
"|="                    { \p s -> (DASHMATCH, p) }

@w"{"                   { \p s -> (LBRACE, p) }
@w"+"                   { \p s -> (PLUS, p) }
@w">"                   { \p s -> (GREATER, p) }
@w","                   { \p s -> (COMMA, p) }

@string                 { \p s -> (STRING s, p) }

@ident                  { \p s -> (IDENT s, p) }

"#"@name                { \p s -> (HASH s, p) }

"@import"               { \p s -> (IMPORT_SYM, p) }
"@page"                 { \p s -> (PAGE_SYM, p) }
"@media"                { \p s -> (MEDIA_SYM, p) }
"@charset"              { \p s -> (CHARSET_SYM, p) }

"!"@w"important"        { \p s -> (IMPORTANT_SYM, p) }

@num em                 { \p s -> (EMS (read ('0':(take (length s - 2) s))), p) }
@num ex                 { \p s -> (EXS (read ('0':(take (length s - 2) s))), p) }
@num px                 { \p s -> (LENGTH s, p) }
@num cm                 { \p s -> (LENGTH s, p) }
@num mm                 { \p s -> (LENGTH s, p) }
@num in                 { \p s -> (LENGTH s, p) }
@num pt                 { \p s -> (LENGTH s, p) }
@num pc                 { \p s -> (LENGTH s, p) }
@num deg                { \p s -> (ANGLE s, p) }
@num rad                { \p s -> (ANGLE s, p) }
@num grad               { \p s -> (ANGLE s, p) }
@num ms                 { \p s -> (TIME s, p) }
@num s                  { \p s -> (TIME s, p) }
@num Hz                 { \p s -> (FREQ s, p) }
@num kHz                { \p s -> (FREQ s, p) }
@num @ident             { \p s -> (DIMEN s, p) }
@num "%"                { \p s -> (PERCENTAGE (read ('0':(take (length s - 1) s))), p) }
@num                    { \p s -> (NUMBER (read ('0':s)), p) }

"url("@w@string@w")"    { \p s -> (URI s, p) }
"url("@w@url@w")"       { \p s -> (URI s, p) }
@ident"\050"            { \p s -> (FUNCTION s, p) }

";"                     { \p s -> (SEMI, p) }
"}"                     { \p s -> (RBRACE, p) }
":"                     { \p s -> (COLON, p) }
"/"                     { \p s -> (SLASH, p) }
"-"                     { \p s -> (MINUS, p) }
"."                     { \p s -> (DOT, p) }
"*"                     { \p s -> (ASTERISK, p) }
"["                     { \p s -> (LBRAC, p) }
"]"                     { \p s -> (RBRAC, p) }
"="                     { \p s -> (EQUALS, p) }
")"                     { \p s -> (RPAREN, p) }
.                       { \p s -> (DELIM (head s), p) }


{
type TokenPosn = (Token, AlexPosn)

data Token =
        INCLUDES        |
        DASHMATCH       |
        LBRACE          |
        PLUS            |
        GREATER         |
        COMMA           |
        STRING String   |
        IDENT String    |
        HASH String     |
        IMPORT_SYM      |
        PAGE_SYM        |
        MEDIA_SYM       |
        CHARSET_SYM     |
        IMPORTANT_SYM   |
        EMS Float       |
        EXS Float       |
        LENGTH String   |
        ANGLE String    |
        TIME String     |
        FREQ String     |
        DIMEN String    |
        PERCENTAGE Float |
        NUMBER Float    |
        URI String      |
        FUNCTION String |
        SEMI            |
        RBRACE          |
        COLON           |
        SLASH           |
        MINUS           |
        DOT             |
        ASTERISK        |
        LBRAC           |
        RBRAC           |
        EQUALS          |
        RPAREN          |
        DELIM Char
        deriving (Eq, Show)
}
1	--
2	-- This file is part of FactorCSS
3	-- Licensed under the MIT License,
4	-- http://www.opensource.org/licenses/mit-license
5	-- Copyright 2004 James Bursa <james@semichrome.net>
6	--
7
8	-- Tokeniser for CSS 2.1
9	-- See CSS 2.1 G.2
10
11	{
12	module Tokeniser where
13	}
14
15	%wrapper "posn"
16
17	$h = [0-9a-f]
18	$nonascii = [\x80-\xff]
19	@unicode = \\$h{1,6}(\r\n\|[\ \t\r\n\f])?
20	@escape = @unicode\|\\[\x20-\x7e\x80-\xff]
21	@nmstart = [_a-zA-Z]\|$nonascii\|@escape
22	@nmchar = [\-_a-zA-Z0-9]\|$nonascii\|@escape
23	@nl = \n\|\r\n\|\r\|\f
24	@string1 = \"([\t\ \!\#\x24\x25&\x28-\x7e]\|\\@nl\|\'\|$nonascii\|@escape\|\.)*\"
25	@string2 = \'([\t\ \!\#\x24\x25&\x28-\x7e]\|\\@nl\|\"\|$nonascii\|@escape\|\.)*\'
26	@ident = @nmstart@nmchar*
27	@name = @nmchar+
28	@num = [\-\053]?[0-9]+\|[0-9]*"."[0-9]+
29	@string = @string1\|@string2
30	@url = ([\!\#\x24\x25&\x2a-\x7e]\|$nonascii\|@escape)*
31	$s = [\ \t\r\n\f]
32	@w = $s*
33	@range = \?{1,6}\|$h(\?{0,5}\|$h(\?{0,4}\|$h(\?{0,3}\|$h(\?{0,2}\|$h(\??\|$h)))))
34	$all = \x00-\xff
35	@comment = \/\$all#\x2a\+($all#[\/\x2a]$all#\x2a\+)\/
36
37	tokens :-
38
39	$s+ ;
40	@comment ;
41
42	"<!--" ;
43	"-->" ;
44	"~=" { \p s -> (INCLUDES, p) }
45	"\|=" { \p s -> (DASHMATCH, p) }
46
47	@w"{" { \p s -> (LBRACE, p) }
48	@w"+" { \p s -> (PLUS, p) }
49	@w">" { \p s -> (GREATER, p) }
50	@w"," { \p s -> (COMMA, p) }
51
52	@string { \p s -> (STRING s, p) }
53
54	@ident { \p s -> (IDENT s, p) }
55
56	"#"@name { \p s -> (HASH s, p) }
57
58	"@import" { \p s -> (IMPORT_SYM, p) }
59	"@page" { \p s -> (PAGE_SYM, p) }
60	"@media" { \p s -> (MEDIA_SYM, p) }
61	"@charset" { \p s -> (CHARSET_SYM, p) }
62
63	"!"@w"important" { \p s -> (IMPORTANT_SYM, p) }
64
65	@num em { \p s -> (EMS (read ('0':(take (length s - 2) s))), p) }
66	@num ex { \p s -> (EXS (read ('0':(take (length s - 2) s))), p) }
67	@num px { \p s -> (LENGTH s, p) }
68	@num cm { \p s -> (LENGTH s, p) }
69	@num mm { \p s -> (LENGTH s, p) }
70	@num in { \p s -> (LENGTH s, p) }
71	@num pt { \p s -> (LENGTH s, p) }
72	@num pc { \p s -> (LENGTH s, p) }
73	@num deg { \p s -> (ANGLE s, p) }
74	@num rad { \p s -> (ANGLE s, p) }
75	@num grad { \p s -> (ANGLE s, p) }
76	@num ms { \p s -> (TIME s, p) }
77	@num s { \p s -> (TIME s, p) }
78	@num Hz { \p s -> (FREQ s, p) }
79	@num kHz { \p s -> (FREQ s, p) }
80	@num @ident { \p s -> (DIMEN s, p) }
81	@num "%" { \p s -> (PERCENTAGE (read ('0':(take (length s - 1) s))), p) }
82	@num { \p s -> (NUMBER (read ('0':s)), p) }
83
84	"url("@w@string@w")" { \p s -> (URI s, p) }
85	"url("@w@url@w")" { \p s -> (URI s, p) }
86	@ident"\050" { \p s -> (FUNCTION s, p) }
87
88	";" { \p s -> (SEMI, p) }
89	"}" { \p s -> (RBRACE, p) }
90	":" { \p s -> (COLON, p) }
91	"/" { \p s -> (SLASH, p) }
92	"-" { \p s -> (MINUS, p) }
93	"." { \p s -> (DOT, p) }
94	"*" { \p s -> (ASTERISK, p) }
95	"[" { \p s -> (LBRAC, p) }
96	"]" { \p s -> (RBRAC, p) }
97	"=" { \p s -> (EQUALS, p) }
98	")" { \p s -> (RPAREN, p) }
99	. { \p s -> (DELIM (head s), p) }
100
101
102	{
103	type TokenPosn = (Token, AlexPosn)
104
105	data Token =
106	INCLUDES \|
107	DASHMATCH \|
108	LBRACE \|
109	PLUS \|
110	GREATER \|
111	COMMA \|
112	STRING String \|
113	IDENT String \|
114	HASH String \|
115	IMPORT_SYM \|
116	PAGE_SYM \|
117	MEDIA_SYM \|
118	CHARSET_SYM \|
119	IMPORTANT_SYM \|
120	EMS Float \|
121	EXS Float \|
122	LENGTH String \|
123	ANGLE String \|
124	TIME String \|
125	FREQ String \|
126	DIMEN String \|
127	PERCENTAGE Float \|
128	NUMBER Float \|
129	URI String \|
130	FUNCTION String \|
131	SEMI \|
132	RBRACE \|
133	COLON \|
134	SLASH \|
135	MINUS \|
136	DOT \|
137	ASTERISK \|
138	LBRAC \|
139	RBRAC \|
140	EQUALS \|
141	RPAREN \|
142	DELIM Char
143	deriving (Eq, Show)
144	}