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