1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
require 'strscan'
module Web
module CSS
class Scanner
H = "[0-9a-f]"
NONASCII = "[\302\240-\364\217\277\277]"
UNICODE = "\\\\#{H}{1,6}[ \\t\\r\\n\\f]?"
ESCAPE = "(?:#{UNICODE}|\\\\[ -~\302\240-\364\217\277\277])"
NMSTART = "(?:[a-z]|#{NONASCII}|#{ESCAPE})"
NMCHAR = "(?:[a-z0-9\-]|#{NONASCII}|#{ESCAPE})"
NL = "(?:\\n|\\r\\n|\\r|\\f)"
STRING1 = "(?:\"([\\t !\#$%&(-~]|#{NL}|\'|#{NONASCII}|#{ESCAPE})*\")"
STRING2 = "(?:\'([\\t !\#$%&(-~]|#{NL}|\"|#{NONASCII}|#{ESCAPE})*\')"
IDENT = "#{NMSTART}#{NMCHAR}*"
NAME = "#{NMCHAR}+"
NUM = "(?:[0-9]+|[0-9]*\.[0-9]+)"
STRING = "(?:#{STRING1}|#{STRING2})"
URL = "(?:[!\#$%&*-~]|#{NONASCII}|#{ESCAPE})*"
W = "[ \\t\\r\\n\\f]*"
RANGE = "\\?{1,6}|#{H}(\\?{0,5}|#{H}(\\?{0,4}|#{H}(\\?{0,3}|#{H}(\\?{0,2}|#{H}(\\?\\?|#{H})))))"
def initialize(io,rs=$/)
@__io = io # IO
@__rs = rs # Record Separator
@__scan = StringScanner.new('') # StringScanner(strscan)
@__line_no = 0 # Line Number
@__queue = [] # Token Queue
@__state = :default # Scanner State
@__state_stack = [] # State Stack(CALL/RETURN)
init if respond_to? :init
end
def rest?
if @__io.eof?
@__scan.rest?
else
true
end
end
#
def shift
until token = @__queue.shift
return nil unless rest?
if @__scan.empty?
@__line_no += 1
@__scan.string = @__io.gets(@__rs)
end
@__pos = @__scan.pointer
send @__state
end
return token
end
def unshift(token)
@__queue.unshift token
end
def push(token)
@__queue.push token
end
def pop
@__queue.pop
end
def token
shift
end
def call_state(state)
@__state_stack.push @__state
@__state = state
end
def return_state
@__state = @__state_stack.pop
end
def transit_state(state)
@__state = state
end
def scan(regex)
@__scan.scan(regex)
end
def scan_until(regex)
@__scan.scan_until(regex)
end
def matched
@__scan.matched
end
def unscan
@__scan.unscan
end
def ungets(str)
@__scan.string = str + @__scan.rest
end
def [](n)
@__scan[n]
end
def aref(n)
@__scan[n]
end
def pos
@__pos
end
def line_no
@__line_no
end
#<Rules>
def default
if scan(/[ \t\r\n\f]+/ui)
push [:S,matched]
elsif scan(/\/\*/ui)
transit_state :comment
elsif scan(/<!--/ui)
push [:CDO,matched]
elsif scan(/-->/ui)
push [:CDC,matched]
elsif scan(/~=/ui)
push [:INCLUDES,matched]
elsif scan(/\|=/ui)
push [:DASHMATCH,matched]
elsif scan(/#{STRING}/ui)
push [:STRING,matched]
elsif scan(/url\(#{W}(#{STRING})#{W}\)/ui)
push [:URI,matched]
elsif scan(/url\(#{W}(#{URL})#{W}\)/ui)
push [:URI,matched]
elsif scan(/#{IDENT}/ui)
push [:IDENT,matched]
elsif scan(/\##{NAME}/ui)
push [:HASH,matched]
elsif scan(/@#{IDENT}/ui)
case matched.downcase
when "@import"
push [:IMPORT_SYM,matched]
when "@page"
push [:PAGE_SYM,matched]
when "@media"
push [:MEDIA_SYM,matched]
when "@font-face"
push [:FONT_FACE_SYM,matched]
when "@charset"
push [:CHARSET_SYM,matched]
else
push [:ATKEYWORD,matched]
end
elsif scan(/!#{W}important/ui)
push [:IMPORTANT_SYM,matched]
elsif scan(/(#{NUM})em/ui)
push [:EMS,matched]
elsif scan(/(#{NUM})ex/ui)
push [:EXS,matched]
elsif scan(/(#{NUM})px/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})cm/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})mm/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})in/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})pt/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})pc/ui)
push [:LENGTH,matched]
elsif scan(/(#{NUM})deg/ui)
push [:ANGLE,matched]
elsif scan(/(#{NUM})rad/ui)
push [:ANGLE,matched]
elsif scan(/(#{NUM})grad/ui)
push [:ANGLE,matched]
elsif scan(/(#{NUM})ms/ui)
push [:TIME,matched]
elsif scan(/(#{NUM})s/ui)
push [:TIME,matched]
elsif scan(/(#{NUM})Hz/ui)
push [:FREQ,matched]
elsif scan(/(#{NUM})kHz/ui)
push [:FREQ,matched]
elsif scan(/(#{NUM})(#{IDENT})/ui)
push [:DIMEN,matched]
elsif scan(/(#{NUM})%/ui)
push [:PERCENTAGE,matched]
elsif scan(/(#{NUM})/ui)
push [:NUMBER,matched]
elsif scan(/(#{IDENT})\(/ui)
push [:FUNCTION,matched]
elsif scan(/U\+#{RANGE}/ui)
push [:UNICODERANGE,matched]
elsif scan(/U\+#{H}{1,6}-#{H}{1,6}/ui)
push [:UNICODERANGE,matched]
elsif scan(/#{IDENT}/ui)
push [:IDENT,matched]
elsif scan(/./ui)
push [matched.intern,matched]
else
raise
end
end
def comment
if scan(/[^*]/ui)
#
elsif scan(/\*\//ui)
transit_state :default
elsif scan(/./ui)
#
else
raise
end
end
#</Rules>
end # Scanner
end # CSS
end # Web
if $0==__FILE__
scan = Web::CSS::Scanner.new(ARGF)
while token=scan.token
p token
end
end
|
