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module CodeRay
module Scanners
class CSS < Scanner
register_for :css
KINDS_NOT_LOC = [
:comment,
:class, :pseudo_class, :tag,
:id, :directive,
:key, :value, :operator, :color, :float, :string,
:error, :important, :type,
] # :nodoc:
module RE # :nodoc:
Hex = /[0-9a-fA-F]/
Unicode = /\\#{Hex}{1,6}\b/ # differs from standard because it allows uppercase hex too
Escape = /#{Unicode}|\\[^\n0-9a-fA-F]/
NMChar = /[-_a-zA-Z0-9]/
NMStart = /[_a-zA-Z]/
String1 = /"(?:[^\n\\"]+|\\\n|#{Escape})*"?/ # TODO: buggy regexp
String2 = /'(?:[^\n\\']+|\\\n|#{Escape})*'?/ # TODO: buggy regexp
String = /#{String1}|#{String2}/
HexColor = /#(?:#{Hex}{6}|#{Hex}{3})/
Num = /-?(?:[0-9]*\.[0-9]+|[0-9]+)n?/
Name = /#{NMChar}+/
Ident = /-?#{NMStart}#{NMChar}*/
AtKeyword = /@#{Ident}/
Percentage = /#{Num}%/
reldimensions = %w[em ex px]
absdimensions = %w[in cm mm pt pc]
Unit = Regexp.union(*(reldimensions + absdimensions + %w[s dpi dppx deg]))
Dimension = /#{Num}#{Unit}/
Function = /(?:url|alpha|attr|counters?)\((?:[^)\n]|\\\))*\)?/
Id = /(?!#{HexColor}\b(?!-))##{Name}/
Class = /\.#{Name}/
PseudoClass = /::?#{Ident}/
AttributeSelector = /\[[^\]]*\]?/
end
protected
def setup
@state = :initial
@value_expected = false
end
def scan_tokens encoder, options
states = Array(options[:state] || @state).dup
value_expected = @value_expected
until eos?
if match = scan(/\s+/)
encoder.text_token match, :space
elsif case states.last
when :initial, :media
if match = scan(/(?>#{RE::Ident})(?!\()|\*/ox)
encoder.text_token match, :tag
next
elsif match = scan(RE::Class)
encoder.text_token match, :class
next
elsif match = scan(RE::Id)
encoder.text_token match, :id
next
elsif match = scan(RE::PseudoClass)
encoder.text_token match, :pseudo_class
next
elsif match = scan(RE::AttributeSelector)
# TODO: Improve highlighting inside of attribute selectors.
encoder.text_token match[0,1], :operator
encoder.text_token match[1..-2], :attribute_name if match.size > 2
encoder.text_token match[-1,1], :operator if match[-1] == ?]
next
elsif match = scan(/@media/)
encoder.text_token match, :directive
states.push :media_before_name
next
end
when :block
if match = scan(/(?>#{RE::Ident})(?!\()/ox)
if value_expected
encoder.text_token match, :value
else
encoder.text_token match, :key
end
next
end
when :media_before_name
if match = scan(RE::Ident)
encoder.text_token match, :type
states[-1] = :media_after_name
next
end
when :media_after_name
if match = scan(/\{/)
encoder.text_token match, :operator
states[-1] = :media
next
end
else
#:nocov:
raise_inspect 'Unknown state', encoder
#:nocov:
end
elsif match = scan(/\/\*(?:.*?\*\/|\z)/m)
encoder.text_token match, :comment
elsif match = scan(/\{/)
value_expected = false
encoder.text_token match, :operator
states.push :block
elsif match = scan(/\}/)
value_expected = false
encoder.text_token match, :operator
if states.last == :block || states.last == :media
states.pop
end
elsif match = scan(/#{RE::String}/o)
encoder.begin_group :string
encoder.text_token match[0, 1], :delimiter
encoder.text_token match[1..-2], :content if match.size > 2
encoder.text_token match[-1, 1], :delimiter if match.size >= 2
encoder.end_group :string
elsif match = scan(/#{RE::Function}/o)
encoder.begin_group :function
start = match[/^\w+\(/]
encoder.text_token start, :delimiter
if match[-1] == ?)
encoder.text_token match[start.size..-2], :content if match.size > start.size + 1
encoder.text_token ')', :delimiter
else
encoder.text_token match[start.size..-1], :content if match.size > start.size
end
encoder.end_group :function
elsif match = scan(/(?: #{RE::Dimension} | #{RE::Percentage} | #{RE::Num} )/ox)
encoder.text_token match, :float
elsif match = scan(/#{RE::HexColor}/o)
encoder.text_token match, :color
elsif match = scan(/! *important/)
encoder.text_token match, :important
elsif match = scan(/(?:rgb|hsl)a?\([^()\n]*\)?/)
encoder.text_token match, :color
elsif match = scan(RE::AtKeyword)
encoder.text_token match, :directive
elsif match = scan(/ [+>~:;,.=()\/] /x)
if match == ':'
value_expected = true
elsif match == ';'
value_expected = false
end
encoder.text_token match, :operator
else
encoder.text_token getch, :error
end
end
if options[:keep_state]
@state = states
@value_expected = value_expected
end
encoder
end
end
end
end
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