class Syntax::SQLite

def self.add_function(name)
  SQLite_PREDEFINED_FUNCTIONS << name
end

def step
  case
  when scan(/\s+/)
    start_group :normal, matched
  when scan(%r{ "(?: \\. | \\" | [^"\n])*" }x)
    start_group :string, matched
  when scan(%r{ '(?: \\. | \\' | [^'\n])*' }x )
    start_group :string, matched
  when (scan(/[a-z_][a-z_\d]+/i) or scan(/[<>\|\*%&!=]+/))
    m = matched.downcase
    if SQLite_PREDEFINED_FUNCTIONS.include?( m )
      start_group :function, matched
    elsif SQLite_KEYWORDS.include?( m )
      start_group :keyword, matched
    elsif SQLite_DATATYPES.include?( m )
      start_group :datatype, matched
    elsif SQLite_OPERATORS.include?( m )
      start_group :operator, matched
    else
      start_group :ident, matched
    end
  when scan(/--.*$/)
    start_group :comment, matched
  else
    start_group :other, scan(/./x)
  end
end