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module CodeRay
module Scanners
class Css < Scanner
register_for :css
module RE
NonASCII = /[\x80-\xFF]/
Hex = /[0-9a-fA-F]/
Unicode = /\\#{Hex}{1,6}(?:\r\n|\s)?/ # differs from standard because it allows uppercase hex too
Escape = /#{Unicode}|\\[^\r\n\f0-9a-fA-F]/
NMChar = /[_a-zA-Z0-9-]|#{NonASCII}|#{Escape}/
NMStart = /[_a-zA-Z]|#{NonASCII}|#{Escape}/
NL = /\r\n|\r|\n|\f/
String1 = /"(?:[^\n\r\f\\"]|\\#{NL}|#{Escape})*"/
String2 = /'(?:[^\n\r\f\\']|\\#{NL}|#{Escape})*'/
String = /#{String1}|#{String2}/
Invalid1 = /"(?:[^\n\r\f\\"]|\\#{NL}|#{Escape})*/
Invalid2 = /'(?:[^\n\r\f\\']|\\#{NL}|#{Escape})*/
Invalid = /#{Invalid1}|#{Invalid2}/
W = /\s+/
S = W
HexColor = /#(?:#{Hex}{6}|#{Hex}{3})/
Color = /#{HexColor}/
Num = /-?(?:[0-9]+|[0-9]*\.[0-9]+)/
Name = /#{NMChar}+/
Ident = /-?#{NMStart}#{NMChar}*/
AtKeyword = /@#{Ident}/
Percentage = /#{Num}%/
reldimensions = %w[em ex px]
absdimensions = %w[in cm mm pt pc]
Unit = /#{(reldimensions + absdimensions).join('|')}/
Dimension = /#{Num}#{Unit}/
Comment = %r! /\* (?: .*? \*/ | .* ) !mx
URL = /url\((?:[^)\n\r\f]|\\\))*\)/
Id = /##{Name}/
Class = /\.#{Name}/
end
def scan_tokens tokens, options
states = [:initial]
i = 0
until eos?
kind = nil
match = nil
if states.last == :comment
if scan /(?:[^\n\r\f*]|\*(?!\/))+/
kind = :comment
elsif scan /\*\//
kind = :comment
states.pop
elsif scan RE::S
kind = :space
end
elsif scan RE::S
kind = :space
elsif scan /\/\*/
kind = :comment
states.push :comment
elsif scan RE::String
kind = :string
elsif scan RE::AtKeyword
kind = :reserved
elsif scan RE::Invalid
kind = :error
elsif scan RE::URL
kind = :string
elsif scan RE::Dimension
kind = :float
elsif scan RE::Percentage
kind = :float
elsif scan RE::Num
kind = :float
elsif scan /\{/
kind = :operator
states.push :block
elsif scan /\}/
if states.last == :block
kind = :operator
states.pop
else
kind = :error
end
elsif
case states.last
when :initial
if scan RE::Class
kind = :class
elsif scan RE::Id
kind = :constant
elsif scan RE::Ident
kind = :label
elsif scan RE::Name
kind = :identifier
end
when :block
if scan RE::Color
kind = :color
elsif scan RE::Ident
kind = :definition
elsif scan RE::Name
kind = :symbol
end
else
raise_inspect 'Unknown state', tokens
end
elsif scan(/ [-+*\/=<>?:;,!&^|()\[\]{}~%]+ | \.(?!\d) /x)
kind = :operator
else
getch
kind = :error
end
match ||= matched
if $DEBUG and not kind
raise_inspect 'Error token %p in line %d' %
[[match, kind], line], tokens
end
raise_inspect 'Empty token', tokens unless match
tokens << [match, kind]
end
tokens
end
end
end
end
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