Boo

allow \a and other special characters

Details

  • Type: Improvement Improvement
  • Status: Closed Closed
  • Priority: Minor Minor
  • Resolution: Fixed
  • Affects Version/s: None
  • Fix Version/s: 0.7
  • Component/s: Parser
  • Labels:
    None
  • Number of attachments :
    0

Description

Some special characters allowed in C# are not allowed in boo currently, such as \a (a console beep).

Add these lines to the SESC section of boo.g and booel.g:

( 'a'!

{text.Length = _begin; text.Append("\a"); }

) |
( 'b'!

{text.Length = _begin; text.Append("\b"); }

) |
( 'f'!

{text.Length = _begin; text.Append("\f"); }

) |
( '0'!

{text.Length = _begin; text.Append("\0"); }

) |

I had to use that code instead of $setText because these special characters are not recognized by ANTLR's java runtime.

Test with:
print "here is a beep: \a"
print "hello\b backspace"

According to the C# specification, "\v" (vertical tab) should be allowed too:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csspec/html/vclrfcsharpspec_C.asp
but I could not get it to work with ANTLR, unless I used
v instead and manually changed the string in the generated BooLexer.cs file back to \v. It is not important to me.

Activity

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Ayende Rahien added a comment -

\v is still not working, any plans to fix this/

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Ayende Rahien added a comment - \v is still not working, any plans to fix this/
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Doug H added a comment -

I think I found a workaround. The ascii code for \v is 0x0B (13), so I added this to boo.g and booel.g:

( 'v'!

{text.Length = _begin; text.Append((char)0x0B); }

) |

And testing showed it printed the same output as C#.

Show
Doug H added a comment - I think I found a workaround. The ascii code for \v is 0x0B (13), so I added this to boo.g and booel.g: ( 'v'! {text.Length = _begin; text.Append((char)0x0B); } ) | And testing showed it printed the same output as C#.

People

  • Assignee:
    Rodrigo B. de Oliveira
    Reporter:
    Doug H
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Dates

  • Created:
    Updated:
    Resolved: