Module: CommentStrip::LanguageFamilies::HashLine

Defined in:
lib/comment_strip/language_families/hash_line.rb

Class Method Summary collapse

Class Method Details

.strip(input, lf, **options) ⇒ Object 



51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
 
# File 'lib/comment_strip/language_families/hash_line.rb', line 51

def self.strip input, lf, **options

  return input if input.nil?
  return input if input.empty?

  line    =   0
  column  =   0

  # States:
  #
  # - :dq_string          - within a double-quoted string
  # - :dq_string_escape   - within a double-quoted string when just received a '"', e.g. from immediately after '"the next word is quoted \'
  # - :hash_comment       - in a #-comment, i.e. from immediately after "#"
  # - :sq_string_closing  - waiting for final '\'' in a single-quoted string
  # - :sq_string_escape   - within a escaped single-quoted string, i.e. from immediately after "'\"
  # - :sq_string_open     - within a single-quoted string, i.e. from immediately after "'"
  # - :text               - regular part of the code

  state   =   :text

  r       =   ''

  cc_lines =   0

  input.each_char do |c|

    case c
    when ?\r, ?\n

      line += 1
      column = 0
    else

      column += 1
    end

    skip = false

    case c
    when ?\r, ?\n

      case state
      when :hash_comment

        state = :text
      when :sq_string_escape, :sq_string_closing

        state = :text
      when :dq_string_escape

        state = :dq_string
      when :hash_comment

        state = :text
      end
    else

      # special cases:
      #
      # - for escaped single/double quote
      # - for slash-start

      case state
      when :sq_string_open

        state = (?\\ == c) ? :sq_string_escape : :sq_string_closing
      when :sq_string_escape

        state = :sq_string_closing
      when :dq_string_escape

        state = :dq_string
      else

        case c
        when '#'

          case state
          when :text

            state = :hash_comment
          else

            ;
          end
        when ?\'

          case state
          when :text

            state = :sq_string_open
          when :sq_string_closing

            state = :text
          else

            ;
          end
        when '"'

          case state
          when :text

            state = :dq_string
          when :dq_string

            state = :text
          else

            ;
          end
        when ?\\

          case state
          when :sq_string_open

            state = :sq_string_escape
          when :sq_string_escape

            state = :sq_string_closing
          when :dq_string

            state = :dq_string_escape
          else

            ;
          end
        else

          case state
          when :sq_string_escape

            state = :sq_string_closing
          else

            ;
          end
        end
      end
    end


    case state
    when :hash_comment

      ;
    else

      r << c unless skip
    end
  end

  r
end