82 lines
3.1 KiB
Ruby
82 lines
3.1 KiB
Ruby
# -*- encoding: binary -*-
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require_relative '../../spec_helper'
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require_relative '../fixtures/classes'
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describe "Regexps with escape characters" do
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it "they're supported" do
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/\t/.match("\t").to_a.should == ["\t"] # horizontal tab
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/\v/.match("\v").to_a.should == ["\v"] # vertical tab
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/\n/.match("\n").to_a.should == ["\n"] # newline
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/\r/.match("\r").to_a.should == ["\r"] # return
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/\f/.match("\f").to_a.should == ["\f"] # form feed
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/\a/.match("\a").to_a.should == ["\a"] # bell
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/\e/.match("\e").to_a.should == ["\e"] # escape
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# \nnn octal char (encoded byte value)
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end
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it "support quoting meta-characters via escape sequence" do
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/\\/.match("\\").to_a.should == ["\\"]
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/\//.match("/").to_a.should == ["/"]
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# parenthesis, etc
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/\(/.match("(").to_a.should == ["("]
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/\)/.match(")").to_a.should == [")"]
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/\[/.match("[").to_a.should == ["["]
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/\]/.match("]").to_a.should == ["]"]
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/\{/.match("{").to_a.should == ["{"]
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/\}/.match("}").to_a.should == ["}"]
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# alternation separator
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/\|/.match("|").to_a.should == ["|"]
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# quantifiers
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/\?/.match("?").to_a.should == ["?"]
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/\./.match(".").to_a.should == ["."]
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/\*/.match("*").to_a.should == ["*"]
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/\+/.match("+").to_a.should == ["+"]
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# line anchors
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/\^/.match("^").to_a.should == ["^"]
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/\$/.match("$").to_a.should == ["$"]
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end
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it "allows any character to be escaped" do
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/\y/.match("y").to_a.should == ["y"]
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end
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it "support \\x (hex characters)" do
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/\xA/.match("\nxyz").to_a.should == ["\n"]
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/\x0A/.match("\n").to_a.should == ["\n"]
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/\xAA/.match("\nA").should be_nil
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/\x0AA/.match("\nA").to_a.should == ["\nA"]
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/\xAG/.match("\nG").to_a.should == ["\nG"]
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# Non-matches
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-> { eval('/\xG/') }.should raise_error(SyntaxError)
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# \x{7HHHHHHH} wide hexadecimal char (character code point value)
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end
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it "support \\c (control characters)" do
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#/\c \c@\c`/.match("\00\00\00").to_a.should == ["\00\00\00"]
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/\c#\cc\cC/.match("\03\03\03").to_a.should == ["\03\03\03"]
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/\c'\cG\cg/.match("\a\a\a").to_a.should == ["\a\a\a"]
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/\c(\cH\ch/.match("\b\b\b").to_a.should == ["\b\b\b"]
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/\c)\cI\ci/.match("\t\t\t").to_a.should == ["\t\t\t"]
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/\c*\cJ\cj/.match("\n\n\n").to_a.should == ["\n\n\n"]
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/\c+\cK\ck/.match("\v\v\v").to_a.should == ["\v\v\v"]
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/\c,\cL\cl/.match("\f\f\f").to_a.should == ["\f\f\f"]
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/\c-\cM\cm/.match("\r\r\r").to_a.should == ["\r\r\r"]
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/\cJ/.match("\r").should be_nil
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# Parsing precedence
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/\cJ+/.match("\n\n").to_a.should == ["\n\n"] # Quantifiers apply to entire escape sequence
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/\\cJ/.match("\\cJ").to_a.should == ["\\cJ"]
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-> { eval('/[abc\x]/') }.should raise_error(SyntaxError) # \x is treated as a escape sequence even inside a character class
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# Syntax error
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-> { eval('/\c/') }.should raise_error(SyntaxError)
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# \cx control char (character code point value)
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# \C-x control char (character code point value)
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# \M-x meta (x|0x80) (character code point value)
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# \M-\C-x meta control char (character code point value)
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end
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end
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