Class: Regexp

Inherits:
Object show all
Defined in:
opal/opal/corelib/regexp.rb,
opal/opal/corelib/marshal/write_buffer.rb

Constant Summary collapse

IGNORECASE =
1
EXTENDED =
2
MULTILINE =
4

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.allocateObject



13
14
15
16
17
# File 'opal/opal/corelib/regexp.rb', line 13

def allocate
  allocated = super
  `#{allocated}.uninitialized = true`
  allocated
end

.escape(string) ⇒ Object Also known as: quote



19
20
21
# File 'opal/opal/corelib/regexp.rb', line 19

def escape(string)
  `Opal.escape_regexp(string)`
end

.last_match(n = nil) ⇒ Object



23
24
25
26
27
28
29
# File 'opal/opal/corelib/regexp.rb', line 23

def last_match(n = nil)
  if n.nil?
    $~
  elsif $~
    $~[n]
  end
end

.new(regexp, options = undefined) ⇒ Object Also known as: compile



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
# File 'opal/opal/corelib/regexp.rb', line 76

def new(regexp, options = undefined)
  %x{
    if (regexp.$$is_regexp) {
      return new RegExp(regexp);
    }

    regexp = #{Opal.coerce_to!(regexp, String, :to_str)};

    if (regexp.charAt(regexp.length - 1) === '\\' && regexp.charAt(regexp.length - 2) !== '\\') {
      #{raise RegexpError, "too short escape sequence: /#{regexp}/"}
    }

    if (options === undefined || #{!options}) {
      return new RegExp(regexp);
    }

    if (options.$$is_number) {
      var temp = '';
      if (#{IGNORECASE} & options) { temp += 'i'; }
      if (#{MULTILINE}  & options) { temp += 'm'; }
      options = temp;
    }
    else {
      options = 'i';
    }

    return new RegExp(regexp, options);
  }
end

.union(*parts) ⇒ Object



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
# File 'opal/opal/corelib/regexp.rb', line 33

def union(*parts)
  %x{
    var is_first_part_array, quoted_validated, part, options, each_part_options;
    if (parts.length == 0) {
      return /(?!)/;
    }
    // return fast if there's only one element
    if (parts.length == 1 && parts[0].$$is_regexp) {
      return parts[0];
    }
    // cover the 2 arrays passed as arguments case
    is_first_part_array = parts[0].$$is_array;
    if (parts.length > 1 && is_first_part_array) {
      #{raise TypeError, 'no implicit conversion of Array into String'}
    }
    // deal with splat issues (related to https://github.com/opal/opal/issues/858)
    if (is_first_part_array) {
      parts = parts[0];
    }
    options = undefined;
    quoted_validated = [];
    for (var i=0; i < parts.length; i++) {
      part = parts[i];
      if (part.$$is_string) {
        quoted_validated.push(#{escape(`part`)});
      }
      else if (part.$$is_regexp) {
        each_part_options = #{`part`.options};
        if (options != undefined && options != each_part_options) {
          #{raise TypeError, 'All expressions must use the same options'}
        }
        options = each_part_options;
        quoted_validated.push('('+part.source+')');
      }
      else {
        quoted_validated.push(#{escape(`part`.to_str)});
      }
    }
  }
  # Take advantage of logic that can parse options from JS Regex
  new(`quoted_validated`.join('|'), `options`)
end

Instance Method Details

#==(other) ⇒ Object Also known as: eql?



109
110
111
# File 'opal/opal/corelib/regexp.rb', line 109

def ==(other)
  `other instanceof RegExp && self.toString() === other.toString()`
end

#===(string) ⇒ Object



113
114
115
# File 'opal/opal/corelib/regexp.rb', line 113

def ===(string)
  `#{match(Opal.coerce_to?(string, String, :to_str))} !== nil`
end

#=~(string) ⇒ Object



117
118
119
# File 'opal/opal/corelib/regexp.rb', line 117

def =~(string)
  match(string) && $~.begin(0)
end

#__marshal__(buffer) ⇒ Object



83
84
85
86
87
88
89
90
91
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 83

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.write_user_class(Regexp, self)
  buffer.append('/')
  buffer.write_regexp(self)
  buffer.write_ivars_suffix(self)
end

#casefold?Boolean

Returns:



287
288
289
# File 'opal/opal/corelib/regexp.rb', line 287

def casefold?
  `self.ignoreCase`
end

#inspectObject



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
# File 'opal/opal/corelib/regexp.rb', line 123

def inspect
  # Use a regexp to extract the regular expression and the optional mode modifiers from the string.
  # In the regular expression, escape any front slash (not already escaped) with a backslash.
  %x{
    var regexp_format = /^\/(.*)\/([^\/]*)$/;
    var value = self.toString();
    var matches = regexp_format.exec(value);
    if (matches) {
      var regexp_pattern = matches[1];
      var regexp_flags = matches[2];
      var chars = regexp_pattern.split('');
      var chars_length = chars.length;
      var char_escaped = false;
      var regexp_pattern_escaped = '';
      for (var i = 0; i < chars_length; i++) {
        var current_char = chars[i];
        if (!char_escaped && current_char == '/') {
          regexp_pattern_escaped = regexp_pattern_escaped.concat('\\');
        }
        regexp_pattern_escaped = regexp_pattern_escaped.concat(current_char);
        if (current_char == '\\') {
          if (char_escaped) {
            // does not over escape
            char_escaped = false;
          } else {
            char_escaped = true;
          }
        } else {
          char_escaped = false;
        }
      }
      return '/' + regexp_pattern_escaped + '/' + regexp_flags;
    } else {
      return value;
    }
  }
end

#match(string, pos = undefined, &block) ⇒ Object



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
205
206
207
208
# File 'opal/opal/corelib/regexp.rb', line 161

def match(string, pos = undefined, &block)
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }

    if (pos === undefined) {
      if (string === nil) return #{$~ = nil};
      var m = self.exec($coerce_to(string, #{String}, 'to_str'));
      if (m) {
        #{$~ = MatchData.new(`self`, `m`)};
        return block === nil ? #{$~} : #{yield $~};
      } else {
        return #{$~ = nil};
      }
    }

    pos = $coerce_to(pos, #{Integer}, 'to_int');

    if (string === nil) {
      return #{$~ = nil};
    }

    string = $coerce_to(string, #{String}, 'to_str');

    if (pos < 0) {
      pos += string.length;
      if (pos < 0) {
        return #{$~ = nil};
      }
    }

    // global RegExp maintains state, so not using self/this
    var md, re = Opal.global_regexp(self);

    while (true) {
      md = re.exec(string);
      if (md === null) {
        return #{$~ = nil};
      }
      if (md.index >= pos) {
        #{$~ = MatchData.new(`re`, `md`)};
        return block === nil ? #{$~} : #{yield $~};
      }
      re.lastIndex = md.index + 1;
    }
  }
end

#match?(string, pos = undefined) ⇒ Boolean

Returns:



210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
# File 'opal/opal/corelib/regexp.rb', line 210

def match?(string, pos = undefined)
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }

    if (pos === undefined) {
      return string === nil ? false : self.test($coerce_to(string, #{String}, 'to_str'));
    }

    pos = $coerce_to(pos, #{Integer}, 'to_int');

    if (string === nil) {
      return false;
    }

    string = $coerce_to(string, #{String}, 'to_str');

    if (pos < 0) {
      pos += string.length;
      if (pos < 0) {
        return false;
      }
    }

    // global RegExp maintains state, so not using self/this
    var md, re = Opal.global_regexp(self);

    md = re.exec(string);
    if (md === null || md.index < pos) {
      return false;
    } else {
      return true;
    }
  }
end

#named_capturesObject



251
252
253
254
255
256
257
258
259
# File 'opal/opal/corelib/regexp.rb', line 251

def named_captures
  source.scan(/\(?<(\w+)>/, no_matchdata: true) # Scan for capture groups
        .map(&:first)                           # Get the first regexp match (\w+)
        .each_with_index                        # Add index to an iterator
        .group_by(&:first)                      # Group by the capture group names
        .transform_values do |i|                # Convert hash values
          i.map { |j| j.last + 1 }              # Drop the capture group names; increase indexes by 1
        end
end

#namesObject



247
248
249
# File 'opal/opal/corelib/regexp.rb', line 247

def names
  source.scan(/\(?<(\w+)>/, no_matchdata: true).map(&:first).uniq
end

#optionsObject



269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
# File 'opal/opal/corelib/regexp.rb', line 269

def options
  # Flags would be nice to use with this, but still experimental - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }
    var result = 0;
    // should be supported in IE6 according to https://msdn.microsoft.com/en-us/library/7f5z26w4(v=vs.94).aspx
    if (self.multiline) {
      result |= #{MULTILINE};
    }
    if (self.ignoreCase) {
      result |= #{IGNORECASE};
    }
    return result;
  }
end

#sourceObject Also known as: to_s



265
266
267
# File 'opal/opal/corelib/regexp.rb', line 265

def source
  `self.source`
end

#~Object



261
262
263
# File 'opal/opal/corelib/regexp.rb', line 261

def ~
  self =~ $_
end