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
|
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes.rb', __FILE__)
# src.scan(/[+-]?[\d_]+\.[\d_]+(e[+-]?[\d_]+)?\b|[+-]?[\d_]+e[+-]?[\d_]+\b/i)
describe "String#to_f" do
it "treats leading characters of self as a floating point number" do
"123.45e1".to_f.should == 1234.5
"45.67 degrees".to_f.should == 45.67
"0".to_f.should == 0.0
"123.45e1".to_f.should == 1234.5
".5".to_f.should == 0.5
".5e1".to_f.should == 5.0
"5e".to_f.should == 5.0
"5E".to_f.should == 5.0
end
it "treats special float value strings as characters" do
"NaN".to_f.should == 0
"Infinity".to_f.should == 0
"-Infinity".to_f.should == 0
end
it "allows for varying case" do
"123.45e1".to_f.should == 1234.5
"123.45E1".to_f.should == 1234.5
end
it "allows for varying signs" do
"+123.45e1".to_f.should == +123.45e1
"-123.45e1".to_f.should == -123.45e1
"123.45e+1".to_f.should == 123.45e+1
"123.45e-1".to_f.should == 123.45e-1
"+123.45e+1".to_f.should == +123.45e+1
"+123.45e-1".to_f.should == +123.45e-1
"-123.45e+1".to_f.should == -123.45e+1
"-123.45e-1".to_f.should == -123.45e-1
end
it "allows for underscores, even in the decimal side" do
"1_234_567.890_1".to_f.should == 1_234_567.890_1
end
it "returns 0 for strings with any non-digit in them" do
"blah".to_f.should == 0
"0b5".to_f.should == 0
"0d5".to_f.should == 0
"0o5".to_f.should == 0
"0xx5".to_f.should == 0
end
it "returns 0 for strings with leading underscores" do
"_9".to_f.should == 0
end
it "takes an optional sign" do
"-45.67 degrees".to_f.should == -45.67
"+45.67 degrees".to_f.should == 45.67
"-5_5e-5_0".to_f.should == -55e-50
"-".to_f.should == 0.0
(1.0 / "-0".to_f).to_s.should == "-Infinity"
end
it "returns 0.0 if the conversion fails" do
"bad".to_f.should == 0.0
"thx1138".to_f.should == 0.0
end
end
|
