Real-time collaboration for Jupyter Notebooks, Linux Terminals, LaTeX, VS Code, R IDE, and more,
all in one place.

1
## This class consists of helper methods for regexing logs
2
##
3
## TODO - clean up the style. looks like it was written in the early 90s
4
##
5
## $Id$
6

7
class Regexr
8

9
  def initialize(verbose = false, case_insensitive = true)
10
    @verbose = verbose
11
    @case_insensitive = case_insensitive
12
  end
13

14
  # Check for the beginning and end lines. Handy when you need to ensure a log has started & completed
15
  def verify_start_and_end(data, the_start, the_end)
16
    return false unless data
17

18
    data_lines = data.split("\n")
19
    regex_start = Regexp.new(the_start, @case_insensitive)
20
    regex_end = Regexp.new(the_end, @case_insensitive)
21

22
    if regex_start =~ data_lines.first
23
      return regex_end =~ data_lines.last
24
    end
25

26
    return false
27
  end
28

29
  # Scan for any number of success lines. In order to pass, all successes must match.
30
  def find_strings_that_dont_exist_in_data(data, regexes = [])
31
    return false unless data
32

33
    data_lines = data.split("\n")
34

35
    return nil unless regexes ## count as a pass
36

37
    if regexes
38
      target_successes = regexes.size
39
      success_count = 0
40
      regexes.each { |condition|
41
        ## assume we haven't got it
42
        found = false
43

44
        re = Regexp.new(condition, @case_insensitive)
45

46
        ## for each of our data lines
47
        data_lines.each { |line|
48
          ## if it's a match
49
          if line =~ re
50
            found = true
51
            break ## success!
52
          end
53
        }
54

55
        if !found
56
          return condition ## return this string, it wasn't found.
57
        end
58
      }
59
    end
60

61
    nil ## got all successes, woot!
62
  end
63

64
  # Scan for failures -- if any single failure matches, the test returns true.
65
  def find_strings_that_exist_in_data_except(data, regexes = [], exceptions = [])
66
    return false unless data
67

68
    data_lines = data.split("\n")
69

70
    return nil unless regexes ## count as a pass
71

72
    regexes.each { |condition|
73
      ## for each failure condition that we've been passed
74
      re = Regexp.new(condition, @case_insensitive)
75

76
      ## assume we're okay
77
      found = false
78

79
      data_lines.each { |line|
80
        if re =~ line
81
          found = true # oh, we found a match
82

83
          # but let's check the exceptions
84
          exceptions.map { |exception|
85
            reg_exception = Regexp.new(exception, @case_insensitive)
86

87
            # If the exception matches here, we'll spare it
88
            if reg_exception =~ line
89
              found = false
90
              break
91
            end
92
          }
93

94
          # If we didn't find an exception, we have to fail it. do not pass go.
95
          return condition if found
96
        end
97
      }
98
    }
99

100
    nil ## no failures found!
101
  end
102
end
103

104