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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "String#tr" do
it "returns a new string with the characters from from_string replaced by the ones in to_string" do
"hello".tr('aeiou', '*').should == "h*ll*"
"hello".tr('el', 'ip').should == "hippo"
"Lisp".tr("Lisp", "Ruby").should == "Ruby"
end
it "accepts c1-c2 notation to denote ranges of characters" do
"hello".tr('a-y', 'b-z').should == "ifmmp"
"123456789".tr("2-5","abcdefg").should == "1abcd6789"
"hello ^-^".tr("e-", "__").should == "h_llo ^_^"
"hello ^-^".tr("---", "_").should == "hello ^_^"
end
it "pads to_str with its last char if it is shorter than from_string" do
"this".tr("this", "x").should == "xxxx"
"hello".tr("a-z", "A-H.").should == "HE..."
end
it "raises an ArgumentError a descending range in the replacement as containing just the start character" do
-> { "hello".tr("a-y", "z-b") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError a descending range in the source as empty" do
-> { "hello".tr("l-a", "z") }.should raise_error(ArgumentError)
end
it "translates chars not in from_string when it starts with a ^" do
"hello".tr('^aeiou', '*').should == "*e**o"
"123456789".tr("^345", "abc").should == "cc345cccc"
"abcdefghijk".tr("^d-g", "9131").should == "111defg1111"
"hello ^_^".tr("a-e^e", ".").should == "h.llo ._."
"hello ^_^".tr("^^", ".").should == "......^.^"
"hello ^_^".tr("^", "x").should == "hello x_x"
"hello ^-^".tr("^-^", "x").should == "xxxxxx^-^"
"hello ^-^".tr("^^-^", "x").should == "xxxxxx^x^"
"hello ^-^".tr("^---", "x").should == "xxxxxxx-x"
"hello ^-^".tr("^---l-o", "x").should == "xxlloxx-x"
end
it "supports non-injective replacements" do
"hello".tr("helo", "1212").should == "12112"
end
it "tries to convert from_str and to_str to strings using to_str" do
from_str = mock('ab')
from_str.should_receive(:to_str).and_return("ab")
to_str = mock('AB')
to_str.should_receive(:to_str).and_return("AB")
"bla".tr(from_str, to_str).should == "BlA"
end
ruby_version_is ''...'3.0' do
it "returns subclass instances when called on a subclass" do
StringSpecs::MyString.new("hello").tr("e", "a").should be_an_instance_of(StringSpecs::MyString)
end
end
ruby_version_is '3.0' do
it "returns Stringinstances when called on a subclass" do
StringSpecs::MyString.new("hello").tr("e", "a").should be_an_instance_of(String)
end
end
# http://redmine.ruby-lang.org/issues/show/1839
it "can replace a 7-bit ASCII character with a multibyte one" do
a = "uber"
a.encoding.should == Encoding::UTF_8
b = a.tr("u","ü")
b.should == "über"
b.encoding.should == Encoding::UTF_8
end
it "can replace a multibyte character with a single byte one" do
a = "über"
a.encoding.should == Encoding::UTF_8
b = a.tr("ü","u")
b.should == "uber"
b.encoding.should == Encoding::UTF_8
end
it "does not replace a multibyte character where part of the bytes match the tr string" do
str = "椎名深夏"
a = "\u0080\u0082\u0083\u0084\u0085\u0086\u0087\u0088\u0089\u008A\u008B\u008C\u008E\u0091\u0092\u0093\u0094\u0095\u0096\u0097\u0098\u0099\u009A\u009B\u009C\u009E\u009F"
b = "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ"
str.tr(a, b).should == "椎名深夏"
end
end
describe "String#tr!" do
it "modifies self in place" do
s = "abcdefghijklmnopqR"
s.tr!("cdefg", "12").should == "ab12222hijklmnopqR"
s.should == "ab12222hijklmnopqR"
end
it "returns nil if no modification was made" do
s = "hello"
s.tr!("za", "yb").should == nil
s.tr!("", "").should == nil
s.should == "hello"
end
it "does not modify self if from_str is empty" do
s = "hello"
s.tr!("", "").should == nil
s.should == "hello"
s.tr!("", "yb").should == nil
s.should == "hello"
end
it "raises a FrozenError if self is frozen" do
s = "abcdefghijklmnopqR".freeze
-> { s.tr!("cdefg", "12") }.should raise_error(FrozenError)
-> { s.tr!("R", "S") }.should raise_error(FrozenError)
-> { s.tr!("", "") }.should raise_error(FrozenError)
end
end
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