3.9 Suppressing End of Line Markers

3.9 Suppressing End of Line Markers

End of line markers can be suppressed by the @  sequence. A

single occurrence of a @  sequence serves to suppress only the

Tutorial

end of line marker following it and must appear 

exactly

  before

the end of line marker to be suppressed. No trailing spaces, @!

Developer

comments, or any other characters are permitted between a @ 

sequence and the end of line that it is supposed to suppress. The

Reference

@  sequence is useful for constructing long output lines without

them having to appear in the input. It can also be used in the

1 Introduction

same way as the @+ was used in the previous section to assist

2 Interface

in exposing the structure of output text without affecting the

3 Scanner

output text itself. Finally, it is invaluable for suppressing the

4 Parser

EOL after the opening macro text @{ construct. For example:

5 Analyser

6 Tangle

@$@@{@ 

7 Weave

I am the walrus!@}

8 Shell

is equivalent to

9 Commands

10 Glossary

@$@@{I am the walrus!@}

11 References

The comment construct (@!) can also be used to suppress end

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of lines. However, the @  construct should be preferred for this

purpose as it makes explicit the programmer s intent to suppress

the end of line.

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Copyright   Ross N. Williams 1992,1999. All rights

reserved.

http://www.ross.net/funnelweb/reference/scanner_eol_supp.html [3/3/2000 10:47:42 PM]