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# Copyright 2013 The Servo Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
from __future__ import print_function
import fileinput
import re
import random
def is_comment(line):
return re.search(r"\/\/.*", line)
def init_variables(if_blocks):
random_index = random.randint(0, len(if_blocks) - 1)
start_counter = 0
end_counter = 0
lines_to_delete = []
line_to_mutate = if_blocks[random_index]
return random_index, start_counter, end_counter, lines_to_delete, line_to_mutate
def deleteStatements(file_name, line_numbers):
for line in fileinput.input(file_name, inplace=True):
if fileinput.lineno() not in line_numbers:
print(line.rstrip())
class Strategy:
def __init__(self):
self._strategy_name = ""
self._replace_strategy = {}
def mutate(self, file_name):
line_numbers = []
for line in fileinput.input(file_name):
if not is_comment(line) and re.search(self._replace_strategy['regex'], line):
line_numbers.append(fileinput.lineno())
if len(line_numbers) == 0:
return -1
else:
mutation_line_number = line_numbers[random.randint(0, len(line_numbers) - 1)]
for line in fileinput.input(file_name, inplace=True):
if fileinput.lineno() == mutation_line_number:
line = re.sub(self._replace_strategy['regex'], self._replace_strategy['replaceString'], line)
print(line.rstrip())
return mutation_line_number
class AndOr(Strategy):
def __init__(self):
Strategy.__init__(self)
logical_and = r"(?<=\s)&&(?=\s)"
self._replace_strategy = {
'regex': logical_and,
'replaceString': '||'
}
class IfTrue(Strategy):
def __init__(self):
Strategy.__init__(self)
if_condition = r"(?<=if\s)\s*(?!let\s)(.*)(?=\s\{)"
self._replace_strategy = {
'regex': if_condition,
'replaceString': 'true'
}
class IfFalse(Strategy):
def __init__(self):
Strategy.__init__(self)
if_condition = r"(?<=if\s)\s*(?!let\s)(.*)(?=\s\{)"
self._replace_strategy = {
'regex': if_condition,
'replaceString': 'false'
}
class ModifyComparision(Strategy):
def __init__(self):
Strategy.__init__(self)
less_than_equals = r"(?<=\s)(\<)\=(?=\s)"
greater_than_equals = r"(?<=\s)(\<)\=(?=\s)"
self._replace_strategy = {
'regex': (less_than_equals + '|' + greater_than_equals),
'replaceString': r"\1"
}
class MinusToPlus(Strategy):
def __init__(self):
Strategy.__init__(self)
arithmetic_minus = r"(?<=\s)\-(?=\s.+)"
minus_in_shorthand = r"(?<=\s)\-(?=\=)"
self._replace_strategy = {
'regex': (arithmetic_minus + '|' + minus_in_shorthand),
'replaceString': '+'
}
class PlusToMinus(Strategy):
def __init__(self):
Strategy.__init__(self)
arithmetic_plus = r"(?<=[^\"]\s)\+(?=\s[^A-Z\'?\":\{]+)"
plus_in_shorthand = r"(?<=\s)\+(?=\=)"
self._replace_strategy = {
'regex': (arithmetic_plus + '|' + plus_in_shorthand),
'replaceString': '-'
}
class AtomicString(Strategy):
def __init__(self):
Strategy.__init__(self)
string_literal = r"(?<=\").+(?=\")"
self._replace_strategy = {
'regex': string_literal,
'replaceString': ' '
}
class DuplicateLine(Strategy):
def __init__(self):
Strategy.__init__(self)
self._strategy_name = "duplicate"
append_statement = r".+?append\(.+?\).*?;"
remove_statement = r".+?remove\(.*?\).*?;"
push_statement = r".+?push\(.+?\).*?;"
pop_statement = r".+?pop\(.+?\).*?;"
plus_equals_statement = r".+?\s\+\=\s.*"
minus_equals_statement = r".+?\s\-\=\s.*"
self._replace_strategy = {
'regex': (append_statement + '|' + remove_statement + '|' + push_statement +
'|' + pop_statement + '|' + plus_equals_statement + '|' + minus_equals_statement),
'replaceString': r"\g<0>\n\g<0>",
}
class DeleteIfBlock(Strategy):
def __init__(self):
Strategy.__init__(self)
self.if_block = r"^\s+if\s(.+)\s\{"
self.else_block = r"\selse(.+)\{"
def mutate(self, file_name):
code_lines = []
if_blocks = []
for line in fileinput.input(file_name):
code_lines.append(line)
if re.search(self.if_block, line):
if_blocks.append(fileinput.lineno())
if len(if_blocks) == 0:
return -1
random_index, start_counter, end_counter, lines_to_delete, line_to_mutate = init_variables(if_blocks)
while line_to_mutate <= len(code_lines):
current_line = code_lines[line_to_mutate - 1]
next_line = code_lines[line_to_mutate]
if re.search(self.else_block, current_line) is not None \
or re.search(self.else_block, next_line) is not None:
if_blocks.pop(random_index)
if len(if_blocks) == 0:
return -1
else:
random_index, start_counter, end_counter, lines_to_delete, line_to_mutate = \
init_variables(if_blocks)
continue
lines_to_delete.append(line_to_mutate)
for ch in current_line:
if ch == "{":
start_counter += 1
elif ch == "}":
end_counter += 1
if start_counter and start_counter == end_counter:
deleteStatements(file_name, lines_to_delete)
return lines_to_delete[0]
line_to_mutate += 1
def get_strategies():
return AndOr, IfTrue, IfFalse, ModifyComparision, PlusToMinus, MinusToPlus, \
AtomicString, DuplicateLine, DeleteIfBlock
class Mutator:
def __init__(self, strategy):
self._strategy = strategy
def mutate(self, file_name):
return self._strategy.mutate(file_name)
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