forked from tyler/trie
-
Notifications
You must be signed in to change notification settings - Fork 1
/
trie_spec.rb
266 lines (220 loc) · 6.54 KB
/
trie_spec.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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
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
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
205
206
207
208
209
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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
require File.dirname(__FILE__) + '/../ext/trie/trie'
describe Trie do
before :each do
@trie = Trie.new;
@trie.add('rocket')
@trie.add('rock')
@trie.add('frederico')
end
#describe :path do
# it 'returns the correct path' do
# @trie.path.should == TRIE_PATH
# end
#end
describe :has_key? do
it 'returns true for words in the trie' do
@trie.has_key?('rocket').should be_true
end
it 'returns nil for words that are not in the trie' do
@trie.has_key?('not_in_the_trie').should be_nil
end
end
describe :get do
it 'returns -1 for words in the trie without a weight' do
@trie.get('rocket').should == -1
end
it 'returns nil if the word is not in the trie' do
@trie.get('not_in_the_trie').should be_nil
end
end
describe :add do
it 'adds a word to the trie' do
@trie.add('forsooth').should == true
@trie.get('forsooth').should == -1
end
it 'adds a word with a weight to the trie' do
@trie.add('chicka',123).should == true
@trie.get('chicka').should == 123
end
it 'adds values greater than 16-bit allows' do
@trie.add('chicka', 72_000).should == true
@trie.get('chicka').should == 72_000
end
it 'adds a word with a non-numeric value to the trie' do
@trie.add('doot', 'Heeey').should == true
@trie.get('doot').should == 'Heeey'
end
end
describe :delete do
it 'deletes a word from the trie' do
@trie.delete('rocket').should == true
@trie.has_key?('rocket').should be_nil
end
end
describe :children do
it 'returns all words beginning with a given prefix' do
children = @trie.children('roc')
children.size.should == 2
children.should include('rock')
children.should include('rocket')
end
it 'returns blank array if prefix does not exist' do
@trie.children('ajsodij').should == []
end
it 'includes the prefix if the prefix is a word' do
children = @trie.children('rock')
children.size.should == 2
children.should include('rock')
children.should include('rocket')
end
it 'returns blank array if prefix is nil' do
@trie.children(nil).should == []
end
end
describe :children_with_values do
before :each do
@trie.add('abc',2)
@trie.add('abcd',4)
end
it 'returns all words with values beginning with a given prefix' do
children = @trie.children_with_values('ab')
children.size.should == 2
children.should include(['abc',2])
children.should include(['abcd',4])
end
it 'returns nil if prefix does not exist' do
@trie.children_with_values('ajsodij').should == []
end
it 'includes the prefix if the prefix is a word' do
children = @trie.children_with_values('abc')
children.size.should == 2
children.should include(['abc',2])
children.should include(['abcd',4])
end
it 'returns blank array if prefix is nil' do
@trie.children_with_values(nil).should == []
end
end
#describe :walk_to_terminal do
# it 'returns the first word found along a path' do
# @trie.add 'anderson'
# @trie.add 'andreas'
# @trie.add 'and'
# @trie.walk_to_terminal('anderson').should == 'and'
# end
# it 'returns the first word and value along a path' do
# @trie.add 'anderson'
# @trie.add 'andreas'
# @trie.add 'and', 15
# @trie.walk_to_terminal('anderson',true).should == ['and', 15]
# end
#end
describe :root do
it 'returns a TrieNode' do
@trie.root.should be_an_instance_of(TrieNode)
end
it 'returns a different TrieNode each time' do
@trie.root.should_not == @trie.root
end
end
#describe :save do
# it 'saves the trie to disk such that another trie can be spawned which will read succesfully' do
# @trie.add('omgwtf',123)
# @trie.save
#
# trie2 = Trie.new(TRIE_PATH)
# trie2.get('omgwtf').should == 123
# end
#end
end
describe TrieNode do
before :each do
@trie = Trie.new;
@trie.add('rocket',1)
@trie.add('rock',2)
@trie.add('frederico',3)
@node = @trie.root
end
describe :state do
it 'returns the most recent state character' do
@node.walk!('r')
@node.state.should == 'r'
@node.walk!('o')
@node.state.should == 'o'
end
it 'is nil when no walk has occurred' do
@node.state.should == nil
end
end
describe :full_state do
it 'returns the current string' do
@node.walk!('r').walk!('o').walk!('c')
@node.full_state.should == 'roc'
end
it 'is a blank string when no walk has occurred' do
@node.full_state.should == ''
end
end
describe :walk! do
it 'returns the updated object when the walk succeeds' do
other = @node.walk!('r')
other.should == @node
end
it 'returns nil when the walk fails' do
@node.walk!('q').should be_nil
end
end
describe :walk do
it 'returns a new node object when the walk succeeds' do
other = @node.walk('r')
other.should != @node
end
it 'returns nil when the walk fails' do
@node.walk('q').should be_nil
end
end
describe :value do
it 'returns nil when the node is not terminal' do
@node.walk!('r')
@node.value.should be_nil
end
it 'returns a value when the node is terminal' do
@node.walk!('r').walk!('o').walk!('c').walk!('k')
@node.value.should == 2
end
end
describe :terminal? do
it 'returns true when the node is a word end' do
@node.walk!('r').walk!('o').walk!('c').walk!('k')
@node.should be_terminal
end
it 'returns nil when the node is not a word end' do
@node.walk!('r').walk!('o').walk!('c')
@node.should_not be_terminal
end
end
describe :leaf? do
it 'returns true when this is the end of a branch of the trie' do
@node.walk!('r').walk!('o').walk!('c').walk!('k').walk!('e').walk!('t')
@node.should be_leaf
end
it 'returns nil when there are more splits on this branch' do
@node.walk!('r').walk!('o').walk!('c').walk!('k')
@node.should_not be_leaf
end
end
describe :clone do
it 'creates a new instance of this node which is not this node' do
new_node = @node.clone
new_node.should_not == @node
end
it 'matches the state of the current node' do
new_node = @node.clone
new_node.state.should == @node.state
end
it 'matches the full_state of the current node' do
new_node = @node.clone
new_node.full_state.should == @node.full_state
end
end
end