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# File 'lib/regexp_parser/lexer.rb', line 18
def lex(input, syntax = "ruby/#{RUBY_VERSION}", &block)
syntax = Regexp::Syntax.new(syntax)
self.tokens = []
self.nesting = 0
self.set_nesting = 0
self.conditional_nesting = 0
self.shift = 0
last = nil
Regexp::Scanner.scan(input) do |type, token, text, ts, te|
type, token = *syntax.normalize(type, token)
syntax.check! type, token
ascend(type, token)
if type == :quantifier and last
break_literal(last) if last.type == :literal
break_codepoint_list(last) if last.token == :codepoint_list
end
current = Regexp::Token.new(type, token, text, ts + shift, te + shift,
nesting, set_nesting, conditional_nesting)
current = merge_condition(current) if type == :conditional and
[:condition, :condition_close].include?(token)
last.next = current if last
current.previous = last if last
tokens << current
last = current
descend(type, token)
end
if block_given?
tokens.map { |t| block.call(t) }
else
tokens
end
end
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