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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
# 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
".5".to_f.should == 0.5
".5e1".to_f.should == 5.0
"5.".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 leading underscores" do
"_9".to_f.should == 0
end
it "stops if the underscore is not followed or preceded by a number" do
"1__2".to_f.should == 1.0
"1_.2".to_f.should == 1.0
"1._2".to_f.should == 1.0
"1.2_e2".to_f.should == 1.2
"1.2e_2".to_f.should == 1.2
"1_x2".to_f.should == 1.0
"1x_2".to_f.should == 1.0
"+_1".to_f.should == 0.0
"-_1".to_f.should == 0.0
end
it "does not allow prefixes to autodetect the base" do
"0b10".to_f.should == 0
"010".to_f.should == 10
"0o10".to_f.should == 0
"0d10".to_f.should == 0
"0x10".to_f.should == 0
end
it "treats any non-numeric character other than '.', 'e' and '_' as terminals" do
"blah".to_f.should == 0
"1b5".to_f.should == 1
"1d5".to_f.should == 1
"1o5".to_f.should == 1
"1xx5".to_f.should == 1
"x5".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 "treats a second 'e' as terminal" do
"1.234e1e2".to_f.should == 1.234e1
end
it "treats a second '.' as terminal" do
"1.2.3".to_f.should == 1.2
end
it "treats a '.' after an 'e' as terminal" do
"1.234e1.9".to_f.should == 1.234e1
end
it "returns 0.0 if the conversion fails" do
"bad".to_f.should == 0.0
"thx1138".to_f.should == 0.0
end
it "ignores leading and trailing whitespace" do
" 1.2".to_f.should == 1.2
"1.2 ".to_f.should == 1.2
" 1.2 ".to_f.should == 1.2
"\t1.2".to_f.should == 1.2
"\n1.2".to_f.should == 1.2
"\v1.2".to_f.should == 1.2
"\f1.2".to_f.should == 1.2
"\r1.2".to_f.should == 1.2
end
it "treats non-printable ASCII characters as terminals" do
"\0001.2".to_f.should == 0
"\0011.2".to_f.should == 0
"\0371.2".to_f.should == 0
"\1771.2".to_f.should == 0
"\2001.2".b.to_f.should == 0
"\3771.2".b.to_f.should == 0
end
it "raises Encoding::CompatibilityError if String is in not ASCII-compatible encoding" do
-> {
'1.2'.encode("UTF-16").to_f
}.should raise_error(Encoding::CompatibilityError, "ASCII incompatible encoding: UTF-16")
end
end
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