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Diffstat (limited to 'spec/ruby/core/string/tr_spec.rb')
-rw-r--r-- | spec/ruby/core/string/tr_spec.rb | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/spec/ruby/core/string/tr_spec.rb b/spec/ruby/core/string/tr_spec.rb new file mode 100644 index 0000000000..16d2d318e1 --- /dev/null +++ b/spec/ruby/core/string/tr_spec.rb @@ -0,0 +1,131 @@ +# -*- encoding: utf-8 -*- +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes.rb', __FILE__) + +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 + lambda { "hello".tr("a-y", "z-b") }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError a descending range in the source as empty" do + lambda { "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 + + 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 + + it "taints the result when self is tainted" do + ["h", "hello"].each do |str| + tainted_str = str.dup.taint + + tainted_str.tr("e", "a").tainted?.should == true + + str.tr("e".taint, "a").tainted?.should == false + str.tr("e", "a".taint).tainted?.should == false + end + end + + with_feature :encoding do + # 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 +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 RuntimeError if self is frozen" do + s = "abcdefghijklmnopqR".freeze + lambda { s.tr!("cdefg", "12") }.should raise_error(RuntimeError) + lambda { s.tr!("R", "S") }.should raise_error(RuntimeError) + lambda { s.tr!("", "") }.should raise_error(RuntimeError) + end +end |