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module CodeRay
module Encoders
# = Lint Encoder
#
# Checks for:
#
# - empty tokens
# - incorrect nesting
#
# It will raise an InvalidTokenStream exception when any of the above occurs.
#
# See also: Encoders::DebugLint
class Lint < Debug
register_for :lint
InvalidTokenStream = Class.new StandardError
EmptyToken = Class.new InvalidTokenStream
UnknownTokenKind = Class.new InvalidTokenStream
IncorrectTokenGroupNesting = Class.new InvalidTokenStream
def text_token text, kind
raise EmptyToken, 'empty token for %p' % [kind] if text.empty?
raise UnknownTokenKind, 'unknown token kind %p (text was %p)' % [kind, text] unless TokenKinds.has_key? kind
end
def begin_group kind
@opened << kind
end
def end_group kind
raise IncorrectTokenGroupNesting, 'We are inside %s, not %p (end_group)' % [@opened.reverse.map(&:inspect).join(' < '), kind] if @opened.last != kind
@opened.pop
end
def begin_line kind
@opened << kind
end
def end_line kind
raise IncorrectTokenGroupNesting, 'We are inside %s, not %p (end_line)' % [@opened.reverse.map(&:inspect).join(' < '), kind] if @opened.last != kind
@opened.pop
end
protected
def setup options
@opened = []
end
def finish options
raise 'Some tokens still open at end of token stream: %p' % [@opened] unless @opened.empty?
end
end
end
end
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