1 files changed, 152 insertions, 0 deletions
diff --git a/spec/ruby/language/regexp/encoding_spec.rb b/spec/ruby/language/regexp/encoding_spec.rb
new file mode 100644
index 0000000000..81e845af0c
--- /dev/null
+++ b/spec/ruby/language/regexp/encoding_spec.rb
@@ -0,0 +1,152 @@
+# encoding: binary
+require_relative '../../spec_helper'
+require_relative '../fixtures/classes'
+
+describe "Regexps with encoding modifiers" do
+  it "supports /e (EUC encoding)" do
+    match = /./e.match("\303\251".dup.force_encoding(Encoding::EUC_JP))
+    match.to_a.should == ["\303\251".dup.force_encoding(Encoding::EUC_JP)]
+  end
+
+  it "supports /e (EUC encoding) with interpolation" do
+    match = /#{/./}/e.match("\303\251".dup.force_encoding(Encoding::EUC_JP))
+    match.to_a.should == ["\303\251".dup.force_encoding(Encoding::EUC_JP)]
+  end
+
+  it "supports /e (EUC encoding) with interpolation /o" do
+    match = /#{/./}/e.match("\303\251".dup.force_encoding(Encoding::EUC_JP))
+    match.to_a.should == ["\303\251".dup.force_encoding(Encoding::EUC_JP)]
+  end
+
+  it 'uses EUC-JP as /e encoding' do
+    /./e.encoding.should == Encoding::EUC_JP
+  end
+
+  it 'preserves EUC-JP as /e encoding through interpolation' do
+    /#{/./}/e.encoding.should == Encoding::EUC_JP
+  end
+
+  it "supports /n (No encoding)" do
+    /./n.match("\303\251").to_a.should == ["\303"]
+  end
+
+  it "supports /n (No encoding) with interpolation" do
+    /#{/./}/n.match("\303\251").to_a.should == ["\303"]
+  end
+
+  it "supports /n (No encoding) with interpolation /o" do
+    /#{/./}/n.match("\303\251").to_a.should == ["\303"]
+  end
+
+  it "warns when using /n with a match string with non-ASCII characters and an encoding other than ASCII-8BIT" do
+    -> {
+      eval <<~RUBY
+      /./n.match("\303\251".dup.force_encoding('utf-8'))
+      RUBY
+    }.should complain(%r{historical binary regexp match /.../n against UTF-8 string})
+  end
+
+  it 'uses US-ASCII as /n encoding if all chars are 7-bit' do
+    /./n.encoding.should == Encoding::US_ASCII
+  end
+
+  it 'uses BINARY when is not initialized' do
+    Regexp.allocate.encoding.should == Encoding::BINARY
+  end
+
+  it 'uses BINARY as /n encoding if not all chars are 7-bit' do
+    /\xFF/n.encoding.should == Encoding::BINARY
+  end
+
+  it 'preserves US-ASCII as /n encoding through interpolation if all chars are 7-bit' do
+    /.#{/./}/n.encoding.should == Encoding::US_ASCII
+  end
+
+  it 'preserves BINARY as /n encoding through interpolation if all chars are 7-bit' do
+    /\xFF#{/./}/n.encoding.should == Encoding::BINARY
+  end
+
+  it "supports /s (Windows_31J encoding)" do
+    match = /./s.match("\303\251".dup.force_encoding(Encoding::Windows_31J))
+    match.to_a.should == ["\303".dup.force_encoding(Encoding::Windows_31J)]
+  end
+
+  it "supports /s (Windows_31J encoding) with interpolation" do
+    match = /#{/./}/s.match("\303\251".dup.force_encoding(Encoding::Windows_31J))
+    match.to_a.should == ["\303".dup.force_encoding(Encoding::Windows_31J)]
+  end
+
+  it "supports /s (Windows_31J encoding) with interpolation and /o" do
+    match = /#{/./}/s.match("\303\251".dup.force_encoding(Encoding::Windows_31J))
+    match.to_a.should == ["\303".dup.force_encoding(Encoding::Windows_31J)]
+  end
+
+  it 'uses Windows-31J as /s encoding' do
+    /./s.encoding.should == Encoding::Windows_31J
+  end
+
+  it 'preserves Windows-31J as /s encoding through interpolation' do
+    /#{/./}/s.encoding.should == Encoding::Windows_31J
+  end
+
+  it "supports /u (UTF8 encoding)" do
+    /./u.match("\303\251".dup.force_encoding('utf-8')).to_a.should == ["\u{e9}"]
+  end
+
+  it "supports /u (UTF8 encoding) with interpolation" do
+    /#{/./}/u.match("\303\251".dup.force_encoding('utf-8')).to_a.should == ["\u{e9}"]
+  end
+
+  it "supports /u (UTF8 encoding) with interpolation and /o" do
+    /#{/./}/u.match("\303\251".dup.force_encoding('utf-8')).to_a.should == ["\u{e9}"]
+  end
+
+  it 'uses UTF-8 as /u encoding' do
+    /./u.encoding.should == Encoding::UTF_8
+  end
+
+  it 'preserves UTF-8 as /u encoding through interpolation' do
+    /#{/./}/u.encoding.should == Encoding::UTF_8
+  end
+
+  it "selects last of multiple encoding specifiers" do
+    /foo/ensuensuens.should == /foo/s
+  end
+
+  it "raises Encoding::CompatibilityError when trying match against different encodings" do
+    -> { /\A[[:space:]]*\z/.match(" ".encode("UTF-16LE")) }.should.raise(Encoding::CompatibilityError)
+  end
+
+  it "raises Encoding::CompatibilityError when trying match? against different encodings" do
+    -> { /\A[[:space:]]*\z/.match?(" ".encode("UTF-16LE")) }.should.raise(Encoding::CompatibilityError)
+  end
+
+  it "raises Encoding::CompatibilityError when trying =~ against different encodings" do
+    -> { /\A[[:space:]]*\z/ =~ " ".encode("UTF-16LE") }.should.raise(Encoding::CompatibilityError)
+  end
+
+  it "raises Encoding::CompatibilityError when the regexp has a fixed, non-ASCII-compatible encoding" do
+    -> { Regexp.new("".dup.force_encoding("UTF-16LE"), Regexp::FIXEDENCODING) =~ " ".encode("UTF-8") }.should.raise(Encoding::CompatibilityError)
+  end
+
+  it "raises Encoding::CompatibilityError when the regexp has a fixed encoding and the match string has non-ASCII characters" do
+    -> { Regexp.new("".dup.force_encoding("US-ASCII"), Regexp::FIXEDENCODING) =~ "\303\251".dup.force_encoding('UTF-8') }.should.raise(Encoding::CompatibilityError)
+  end
+
+  it "raises ArgumentError when trying to match a broken String" do
+    s = "\x80".dup.force_encoding('UTF-8')
+    -> { s =~ /./ }.should.raise(ArgumentError, "invalid byte sequence in UTF-8")
+  end
+
+  it "computes the Regexp Encoding for each interpolated Regexp instance" do
+    make_regexp = -> str { /#{str}/ }
+
+    r = make_regexp.call("été".dup.force_encoding(Encoding::UTF_8))
+    r.should.fixed_encoding?
+    r.encoding.should == Encoding::UTF_8
+
+    r = make_regexp.call("abc".dup.force_encoding(Encoding::UTF_8))
+    r.should_not.fixed_encoding?
+    r.encoding.should == Encoding::US_ASCII
+  end
+end