Class: StringScanner

Inherits:
Object show all
Defined in:
opal/stdlib/strscan.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ StringScanner

Returns a new instance of StringScanner



5
6
7
8
9
10
11
# File 'opal/stdlib/strscan.rb', line 5

def initialize(string)
  @string  = string
  @pos     = 0
  @matched = nil
  @working = string
  @match   = []
end

Instance Attribute Details

#matchedObject (readonly)

Returns the value of attribute matched



3
4
5
# File 'opal/stdlib/strscan.rb', line 3

def matched
  @matched
end

#posObject

Returns the value of attribute pos



2
3
4
# File 'opal/stdlib/strscan.rb', line 2

def pos
  @pos
end

#stringObject (readonly)

Returns the value of attribute string



13
14
15
# File 'opal/stdlib/strscan.rb', line 13

def string
  @string
end

Instance Method Details

#[](idx) ⇒ Object



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
# File 'opal/stdlib/strscan.rb', line 83

def [](idx)
  %x{
    var match = #@match;

    if (idx < 0) {
      idx += match.length;
    }

    if (idx < 0 || idx >= match.length) {
      return nil;
    }

    if (match[idx] == null) {
      return nil;
    }

    return match[idx];
  }
end

#beginning_of_line?Boolean Also known as: bol?

Returns:



15
16
17
# File 'opal/stdlib/strscan.rb', line 15

def beginning_of_line?
  `#@pos === 0 || #@string.charAt(#@pos - 1) === "\n"`
end

#check(pattern) ⇒ Object



103
104
105
106
107
108
109
110
111
112
113
114
115
# File 'opal/stdlib/strscan.rb', line 103

def check(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return #@matched = nil;
    }

    return #@matched = result[0];
  }
end

#check_until(pattern) ⇒ Object



117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
# File 'opal/stdlib/strscan.rb', line 117

def check_until(pattern)
  %x{
    var prev_pos = #@prev_pos,
        pos      = #@pos;

    var result = #{scan_until(pattern)};

    if (result !== nil) {
      #@matched = result.substr(-1);
      #@working = #@string.substr(pos);
    }

    #@prev_pos = prev_pos;
    #@pos      = pos;

    return result;
  }
end

#eos?Boolean

Returns:



140
141
142
# File 'opal/stdlib/strscan.rb', line 140

def eos?
  `#@working.length === 0`
end

#exist?(pattern) ⇒ Boolean

Returns:



144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
# File 'opal/stdlib/strscan.rb', line 144

def exist?(pattern)
  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return nil;
    }
    else if (result.index == 0) {
      return 0;
    }
    else {
      return result.index + 1;
    }
  }
end

#get_byteObject Also known as: getch



198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
# File 'opal/stdlib/strscan.rb', line 198

def get_byte
  %x{
    var result = nil;

    if (#@pos < #@string.length) {
      #@prev_pos  = #@pos;
      #@pos      += 1;
      result      = #@matched = #@working.substring(0, 1);
      #@working   = #@working.substring(1);
    }
    else {
      #@matched = nil;
    }

    return result;
  }
end

#match?(pattern) ⇒ Boolean

Returns:



219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
# File 'opal/stdlib/strscan.rb', line 219

def match?(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return nil;
    }
    else {
      #@prev_pos = #@pos;

      return result[0].length;
    }
  }
end

#peek(length) ⇒ Object



136
137
138
# File 'opal/stdlib/strscan.rb', line 136

def peek(length)
  `#@working.substring(0, length)`
end

#post_matchObject



247
248
249
250
251
252
253
254
255
# File 'opal/stdlib/strscan.rb', line 247

def post_match
  %x{
    if (#@matched === nil) {
      return nil;
    }

    return #@string.substr(#@pos);
  }
end

#pre_matchObject



257
258
259
260
261
262
263
264
265
# File 'opal/stdlib/strscan.rb', line 257

def pre_match
  %x{
    if (#@matched === nil) {
      return nil;
    }

    return #@string.substr(0, #@prev_pos);
  }
end

#resetObject



267
268
269
270
271
# File 'opal/stdlib/strscan.rb', line 267

def reset
  @working = @string
  @matched = nil
  @pos     = 0
end

#restObject



273
274
275
# File 'opal/stdlib/strscan.rb', line 273

def rest
  @working
end

#rest?Boolean

Returns:



277
278
279
# File 'opal/stdlib/strscan.rb', line 277

def rest?
  `#@working.length !== 0`
end

#rest_sizeObject



281
282
283
# File 'opal/stdlib/strscan.rb', line 281

def rest_size
  rest.size
end

#scan(pattern) ⇒ Object



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
# File 'opal/stdlib/strscan.rb', line 21

def scan(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return #@matched = nil;
    }
    else if (typeof(result) === 'object') {
      #@prev_pos = #@pos;
      #@pos     += result[0].length;
      #@working  = #@working.substring(result[0].length);
      #@matched  = result[0];
      #@match    = result;

      return result[0];
    }
    else if (typeof(result) === 'string') {
      #@pos     += result.length;
      #@working  = #@working.substring(result.length);

      return result;
    }
    else {
      return nil;
    }
  }
end

#scan_until(pattern) ⇒ 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
# File 'opal/stdlib/strscan.rb', line 51

def scan_until(pattern)
  pattern = anchor(pattern)

  %x{
    var pos     = #@pos,
        working = #@working,
        result;

    while (true) {
      result   = pattern.exec(working);
      pos     += 1;
      working  = working.substr(1);

      if (result == null) {
        if (working.length === 0) {
          return #@matched = nil;
        }

        continue;
      }

      #@matched  = #@string.substr(#@pos, pos - #@pos - 1 + result[0].length);
      #@prev_pos = pos - 1;
      #@pos      = pos;
      #@working  = working.substr(result[0].length);

      return #@matched;
    }
  }
end

#skip(pattern) ⇒ Object



160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
# File 'opal/stdlib/strscan.rb', line 160

def skip(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return #@matched = nil;
    }
    else {
      var match_str = result[0];
      var match_len = match_str.length;

      #@matched   = match_str;
      #@prev_pos  = #@pos;
      #@pos      += match_len;
      #@working   = #@working.substring(match_len);

      return match_len;
    }
  }
end

#skip_until(pattern) ⇒ Object



183
184
185
186
187
188
189
190
191
192
193
194
195
196
# File 'opal/stdlib/strscan.rb', line 183

def skip_until(pattern)
  %x{
    var result = #{scan_until(pattern)};

    if (result === nil) {
      return nil;
    }
    else {
      #@matched = result.substr(-1);

      return result.length;
    }
  }
end

#terminateObject



285
286
287
288
# File 'opal/stdlib/strscan.rb', line 285

def terminate
  @match = nil
  self.pos = @string.length
end

#unscanObject



290
291
292
293
294
295
296
# File 'opal/stdlib/strscan.rb', line 290

def unscan
  @pos      = @prev_pos
  @prev_pos = nil
  @match    = nil

  self
end