I need a re such that:
' /* comment */ String s = "***/"; '.gsub(re, "*\\")
returns:
' /* comment *\ String s = "***/"; '
I want to find all *\ instances that are not enclosed in double-quotes.
Or is this one of those problems ill-suited for a regex?
possible.. but difficult.
I spend this evening making some _broken_ experiments.
--
Simon Strandgaard
server> ruby test_main.rb
Loaded suite TestMain
Started
test_balance_bad1(TestMain): .
test_balance_bad2(TestMain): F
test_balance_bad3(TestMain): F
test_balance_ok1(TestMain): F
test_balance_ok2(TestMain): .
Finished in 0.030393 seconds.
1) Failure:
test_balance_bad2(TestMain)
[test_main.rb:25:in `assert_x'
test_main.rb:33:in `test_balance_bad2']:
<["xx ", "*/"]> expected but was
<nil>.
2) Failure:
test_balance_bad3(TestMain)
[test_main.rb:25:in `assert_x'
test_main.rb:37:in `test_balance_bad3']:
<["xx /* /* */ ", "*/"]> expected but was
<["/* /* "]>.
3) Failure:
test_balance_ok1(TestMain)
[test_main.rb:25:in `assert_x'
test_main.rb:41:in `test_balance_ok1']:
<nil> expected but was
<["/* "]>.
5 tests, 5 assertions, 3 failures, 0 errors
server> expand -t2 test_main.rb
require 'test/unit'
class TestMain < Test::Unit::TestCase
def mk_re
comment_begin = '\/\*' # /*
comment_end = '\*\/' # */
re = /
(
#{comment_begin}
.*?
)
#{comment_end}
.*?
(?! #{comment_begin} )
(?= #{comment_end} )
/x
re
end
def assert_x(expected, input)
actual = mk_re.match(input)
if actual
actual = actual.to_a
actual.shift
end
assert_equal(expected, actual)
end
def test_balance_bad1
s = 'xx /* comment */ String s = "***/"; '
assert_x(['/* comment '], s)
end
def test_balance_bad2
s = 'xx */ */ String s = "***/"; '
assert_x(['xx ', '*/'], s)
end
def test_balance_bad3
s = 'xx /* /* */ */'
assert_x(['xx /* /* */ ', '*/'], s)
end
def test_balance_ok1
s = ' /* */ /* */ '
assert_x(nil, s)
end
def test_balance_ok2
s = 'xx /* /* */ '
assert_x(nil, s)
end
end
if $0 == __FILE__
require 'test/unit/ui/console/testrunner'
Test::Unit::UI::Console::TestRunner.run(TestMain, 3)
end
server>
