1 files changed, 58 insertions, 0 deletions
diff --git a/spec/rubyspec/language/regexp/interpolation_spec.rb b/spec/rubyspec/language/regexp/interpolation_spec.rb
new file mode 100644
index 0000000000..5536c718f1
--- /dev/null
+++ b/spec/rubyspec/language/regexp/interpolation_spec.rb
@@ -0,0 +1,58 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe "Regexps with interpolation" do
+
+  it "allows interpolation of strings" do
+    str = "foo|bar"
+    /#{str}/.should == /foo|bar/
+  end
+
+  it "allows interpolation of literal regexps" do
+    re = /foo|bar/
+    /#{re}/.should == /(?-mix:foo|bar)/
+  end
+
+  it "allows interpolation of any object that responds to to_s" do
+    o = Object.new
+    def o.to_s
+      "object_with_to_s"
+    end
+    /#{o}/.should == /object_with_to_s/
+  end
+
+  it "allows interpolation which mixes modifiers" do
+    re = /foo/i
+    /#{re} bar/m.should == /(?i-mx:foo) bar/m
+  end
+
+  it "allows interpolation to interact with other Regexp constructs" do
+    str = "foo)|(bar"
+    /(#{str})/.should == /(foo)|(bar)/
+
+    str = "a"
+    /[#{str}-z]/.should == /[a-z]/
+  end
+
+  it "gives precedence to escape sequences over substitution" do
+    str = "J"
+    /\c#{str}/.to_s.should == '(?-mix:\c#' + '{str})'
+  end
+
+  it "throws RegexpError for malformed interpolation" do
+    s = ""
+    lambda { /(#{s}/ }.should raise_error(RegexpError)
+    s = "("
+    lambda { /#{s}/ }.should raise_error(RegexpError)
+  end
+
+  it "allows interpolation in extended mode" do
+    var = "#comment\n  foo  #comment\n  |  bar"
+    (/#{var}/x =~ "foo").should == (/foo|bar/ =~ "foo")
+  end
+
+  it "allows escape sequences in interpolated regexps" do
+    escape_seq = %r{"\x80"}n
+    %r{#{escape_seq}}n.should == /(?-mix:"\x80")/n
+  end
+end