Re: Example interpreter C

On Sat, 13 Aug 2005, Henry Butwsky wrote:


> I have written a basic parser (with flex and Bison) that evaluates
> simple expressions , but now I want to add IF/THEN construct and also
> loops
>
> I understand that I need to write a parser that creates and AST
> (abstract symbol table) . Can any one point in the direction of an
> such an expale interpreter ?


> [Uh, AST stands for Abstract Syntax Tree. You'll find a lot more
> references if you use the right name. -John]


I don't know what "expale" is, nor what an abstract syntax tree is.
However, I have written an interpreter with conditionals and loops.
I've also implemented macros using similar techniques.
It's available at:
http://savannah.gnu.org/cgi-bin/viewcvs/3dldf/3dldf/Group/CWEB/
The input files for the parser have names of the pattern "p*.w".
The one with the rules for loops is 'ploops.w' and the one with
rules for conditionals is 'pcondit.w'.


This topic also comes up regularly on the "help-bison" mailing list.
You might want to check the archives:
http://lists.gnu.org/archive/html/help-bison/


Laurence Finston
http://www.gnu.org/software/3dldf/LDF.html
[Expale is a typo for example, and I have to say that if you don't know what
an AST is, you should consider learning a little about compiler basics. -John]

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