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Experiment - Better string literals?

 
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Brent
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Joined: 01 Jul 2005
Posts: 729

PostPosted: Aug 11th, 2014, 4:44pm    Post subject: Experiment - Better string literals? Reply with quote

I was recently looking to improve the "stringError" token in VF's lexer to account for more of the many forms of "stringLiteral" when it occurred to me that the recently introduced metastring token (eg, $CR) could potentially replace a portion of the functionality of "stringLiteral" and improve readability at the same time. If anyone agrees, I'll upload a new VF.exe that implements this feature.

The old version of "Hello World" looked like
Code:
Require IO #out
#out "Hello, world!"NL""

The new version looks like
Code:
Require IO #out
#out "Hello, world!" $NL
End

Any number of metastrings can be abutted, without an explicit concatenation operator, to form a complete string literal. Quoted literals and metastrings can likewise be abutted together, but multiple quoted literals cannot without prepending an underscore to the noninitial literal(s).

You may also notice that the second code above has an END statement whereas the first does not. The most recent release of VF.exe now requires an END statement mainly as a way to suppress the warnings produced by the parser generator I use. If you have an opinion on this, I am all ears.

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STPendl
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Joined: 20 Aug 2007
Posts: 161
Location: Austria

PostPosted: Aug 12th, 2014, 7:25pm    Post subject: Re: Experiment - Better string literals? Reply with quote

The new syntax is easier to remember and doesn't look so strange.
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Stefan

Any code I post can be freely used, just give credit.
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