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Diffstat (limited to 'spec/ruby/language/regexp/escapes_spec.rb')
| -rw-r--r-- | spec/ruby/language/regexp/escapes_spec.rb | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/spec/ruby/language/regexp/escapes_spec.rb b/spec/ruby/language/regexp/escapes_spec.rb new file mode 100644 index 0000000000..4a0e611540 --- /dev/null +++ b/spec/ruby/language/regexp/escapes_spec.rb @@ -0,0 +1,169 @@ +# encoding: binary +require_relative '../../spec_helper' +require_relative '../fixtures/classes' + +# TODO: synchronize with spec/core/regexp/new_spec.rb - +# escaping is also tested there +describe "Regexps with escape characters" do + it "supports escape sequences" do + /\t/.match("\t").to_a.should == ["\t"] # horizontal tab + /\v/.match("\v").to_a.should == ["\v"] # vertical tab + /\n/.match("\n").to_a.should == ["\n"] # newline + /\r/.match("\r").to_a.should == ["\r"] # return + /\f/.match("\f").to_a.should == ["\f"] # form feed + /\a/.match("\a").to_a.should == ["\a"] # bell + /\e/.match("\e").to_a.should == ["\e"] # escape + + # \nnn octal char (encoded byte value) + end + + it "supports quoting meta-characters via escape sequence" do + # parenthesis, etc + /\(/.match("(").to_a.should == ["("] + /\)/.match(")").to_a.should == [")"] + /\[/.match("[").to_a.should == ["["] + /\]/.match("]").to_a.should == ["]"] + /\{/.match("{").to_a.should == ["{"] + /\}/.match("}").to_a.should == ["}"] + /\</.match("<").to_a.should == ["<"] + /\>/.match(">").to_a.should == [">"] + # alternation separator + /\|/.match("|").to_a.should == ["|"] + # quantifiers + /\?/.match("?").to_a.should == ["?"] + /\./.match(".").to_a.should == ["."] + /\*/.match("*").to_a.should == ["*"] + /\+/.match("+").to_a.should == ["+"] + # line anchors + /\^/.match("^").to_a.should == ["^"] + /\$/.match("$").to_a.should == ["$"] + end + + it "supports quoting meta-characters via escape sequence when used as a terminator" do + # parenthesis, etc + # %r[[, %r((, etc literals - are forbidden + %r(\().match("(").to_a.should == ["("] + %r(\)).match(")").to_a.should == [")"] + %r)\().match("(").to_a.should == ["("] + %r)\)).match(")").to_a.should == [")"] + + %r[\[].match("[").to_a.should == ["["] + %r[\]].match("]").to_a.should == ["]"] + %r]\[].match("[").to_a.should == ["["] + %r]\]].match("]").to_a.should == ["]"] + + %r{\{}.match("{").to_a.should == ["{"] + %r{\}}.match("}").to_a.should == ["}"] + %r}\{}.match("{").to_a.should == ["{"] + %r}\}}.match("}").to_a.should == ["}"] + + %r<\<>.match("<").to_a.should == ["<"] + %r<\>>.match(">").to_a.should == [">"] + %r>\<>.match("<").to_a.should == ["<"] + %r>\>>.match(">").to_a.should == [">"] + + # alternation separator + %r|\||.match("|").to_a.should == ["|"] + # quantifiers + %r?\??.match("?").to_a.should == ["?"] + %r.\...match(".").to_a.should == ["."] + %r*\**.match("*").to_a.should == ["*"] + %r+\++.match("+").to_a.should == ["+"] + # line anchors + %r^\^^.match("^").to_a.should == ["^"] + %r$\$$.match("$").to_a.should == ["$"] + end + + it "supports quoting non-meta-characters via escape sequence when used as a terminator" do + non_meta_character_terminators = [ + '!', '"', '#', '%', '&', "'", ',', '-', ':', ';', '@', '_', '`', '/', '=', '~' + ] + + non_meta_character_terminators.each do |c| + pattern = eval("%r" + c + "\\" + c + c) + pattern.match(c).to_a.should == [c] + end + end + + it "does not change semantics of escaped non-meta-character when used as a terminator" do + all_terminators = [*("!".."/"), *(":".."@"), *("[".."`"), *("{".."~")] + meta_character_terminators = ["$", "^", "*", "+", ".", "?", "|", "}", ")", ">", "]"] + special_cases = ['(', '{', '[', '<', '\\'] + + # it should be equivalent to + # [ '!', '"', '#', '%', '&', "'", ',', '-', ':', ';', '@', '_', '`', '/', '=', '~' ] + non_meta_character_terminators = all_terminators - meta_character_terminators - special_cases + + non_meta_character_terminators.each do |c| + pattern = eval("%r" + c + "\\" + c + c) + pattern.should == /#{c}/ + end + end + + it "does not change semantics of escaped meta-character when used as a terminator" do + meta_character_terminators = ["$", "^", "*", "+", ".", "?", "|", "}", ")", ">", "]"] + + meta_character_terminators.each do |c| + pattern = eval("%r" + c + "\\" + c + c) + pattern.should == eval("/\\#{c}/") + end + end + + it "allows any character to be escaped" do + /\y/.match("y").to_a.should == ["y"] + end + + it "supports \\x (hex characters)" do + /\xA/.match("\nxyz").to_a.should == ["\n"] + /\x0A/.match("\n").to_a.should == ["\n"] + /\xAA/.match("\nA").should == nil + /\x0AA/.match("\nA").to_a.should == ["\nA"] + /\xAG/.match("\nG").to_a.should == ["\nG"] + # Non-matches + -> { eval('/\xG/') }.should.raise(SyntaxError) + + # \x{7HHHHHHH} wide hexadecimal char (character code point value) + end + + it "supports \\c (control characters)" do + #/\c \c@\c`/.match("\00\00\00").to_a.should == ["\00\00\00"] + /\c#\cc\cC/.match("\03\03\03").to_a.should == ["\03\03\03"] + /\c'\cG\cg/.match("\a\a\a").to_a.should == ["\a\a\a"] + /\c(\cH\ch/.match("\b\b\b").to_a.should == ["\b\b\b"] + /\c)\cI\ci/.match("\t\t\t").to_a.should == ["\t\t\t"] + /\c*\cJ\cj/.match("\n\n\n").to_a.should == ["\n\n\n"] + /\c+\cK\ck/.match("\v\v\v").to_a.should == ["\v\v\v"] + /\c,\cL\cl/.match("\f\f\f").to_a.should == ["\f\f\f"] + /\c-\cM\cm/.match("\r\r\r").to_a.should == ["\r\r\r"] + + /\cJ/.match("\r").should == nil + + # Parsing precedence + /\cJ+/.match("\n\n").to_a.should == ["\n\n"] # Quantifiers apply to entire escape sequence + /\\cJ/.match("\\cJ").to_a.should == ["\\cJ"] + -> { eval('/[abc\x]/') }.should.raise(SyntaxError) # \x is treated as a escape sequence even inside a character class + # Syntax error + -> { eval('/\c/') }.should.raise(SyntaxError) + + # \cx control char (character code point value) + # \C-x control char (character code point value) + # \M-x meta (x|0x80) (character code point value) + # \M-\C-x meta control char (character code point value) + end + + it "handles three digit octal escapes starting with 0" do + /[\000-\b]/.match("\x00")[0].should == "\x00" + end + + it "handles control escapes with \\C-x syntax" do + /\C-*\C-J\C-j/.match("\n\n\n")[0].should == "\n\n\n" + end + + it "supports the \\K keep operator" do + /a\Kb/.match("ab")[0].should == "b" + end + + it "supports the \\R line break escape" do + /\R/.match("\n")[0].should == "\n" + end +end |