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# -*- 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 be_nil
/\x0AA/.match("\nA").to_a.should == ["\nA"]
/\xAG/.match("\nG").to_a.should == ["\nG"]
# Non-matches
-> { eval('/\xG/') }.should raise_error(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 be_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_error(SyntaxError) # \x is treated as a escape sequence even inside a character class
# Syntax error
-> { eval('/\c/') }.should raise_error(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
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