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rule.rb
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rule.rb
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module Outlaw
class Rule
NoDetectionBlockProvided = Class.new(StandardError)
attr_reader :message, :pattern, :detection_block
def initialize(pattern, message=nil, &detection_block)
@pattern = pattern
@message = message ? message : "Don't do this: #{pattern}"
@detection_block = detection_block
end
def violation?(code)
if detection_block.nil?
LawParser.parse(pattern).call(code)
else
detection_block.call(code)
end
end
class << self
def test(program, start_index, pattern)
pattern_index = 0
params = params_count_hash(pattern)
start_index.upto(program.length) do |index|
code = program[index]
part = pattern[pattern_index]
next if IGNORE_TYPES.include? token_type(code)
return false unless match_token?(code, part, params[part])
pattern_index +=1
return true if pattern_index >= pattern.length
end
return false
# got to end of program without completing pattern
end
private
def match_token?(code, part, parameter)
case part
when Array
match = true if part.include?(code)
when Regexp
match = true if code.match(part)
when Symbol
return false unless param_type_equal(token_type(code), part)
#check count on first and count down subseq matches
if parameter.first.nil? #history of parameter match if any
parameter[0] = code
parameter[1] -= 1 #first occurrence of parameter
match = true
else
if parameter.first == code
parameter[1] -= 1
match = true
else
match = false
end
end
else
match = false
end
match
end
def param_type_equal(lex, param)
#for now just check if it's a variable type, not kw, ws or other token
PARAM_TYPES.include? lex
end
def token_type(code)
Ripper.lex(code).flatten(1)[1] #Ripper's name for token type is returned in array
end
def params_count_hash(pattern)
params = Hash.new(0)
pattern.each do |element|
params[element] += 1 if element.respond_to?(:to_sym)
end
output = {} #nil is placeholder for matched lex code
params.keys.each {|key| output[key] = [nil, params[key]]}
output
end
end
end
end