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# frozen_string_literal: true
begin
require_relative 'lexer.rex'
rescue LoadError
msg = '*** You must run `rake generate` to generate the lexer and the parser ***'
puts '*' * msg.length, msg, '*' * msg.length
raise
end
module RuboCop
module AST
class NodePattern
# Lexer class for `NodePattern`
#
# Doc on how this fits in the compiling process:
# /docs/modules/ROOT/pages/node_pattern.adoc
class Lexer < LexerRex
Error = ScanError
REGEXP_OPTIONS = {
'i' => ::Regexp::IGNORECASE,
'm' => ::Regexp::MULTILINE,
'x' => ::Regexp::EXTENDED,
'o' => 0
}.freeze
private_constant :REGEXP_OPTIONS
attr_reader :source_buffer, :comments, :tokens
def initialize(source)
@tokens = []
super()
parse(source)
end
private
# @return [token]
def emit(type)
value = ss[1] || ss.matched
value = yield value if block_given?
token = token(type, value)
@tokens << token
token
end
def emit_comment
nil
end
def emit_regexp
body = ss[1]
options = ss[2]
flag = options.each_char.sum { |c| REGEXP_OPTIONS[c] }
emit(:tREGEXP) { Regexp.new(body, flag) }
end
def do_parse
# Called by the generated `parse` method, do nothing here.
end
def token(type, value)
[type, value]
end
end
end
end
end
|
