Re: DXF parser in lex/yacc?

Andrew Ellerton <andrewe@technologyXchange.com> wrote:
>I've poked around news group archives, lists of freely available
>parsers/compiler tools and the Autocad site - if there is a lex/yacc parser
>for DXF available, I can't find it.


The DXF syntax is trivial. You may write your own yacc if you really
need it in 6 lines but I doubt. yacc is overkill for DXF.


I suggest writing your parser by hand:
There are always pairs of two lines, the first is a number, the second a
value according the number.
The whole mess is split up in 4 sections:
    header, tables, blocks and entities
with some subsections.


I successfully wrote a parser in perl in 3 minutes which deletes all
the handles, for Forth there is DXFIX.DXT in your support dir, and in
the handbook are basic examples.
Really simple.
-- Reini Urban
AutoCAD stuff at http://xarch.tu-graz.ac.at/autocad/
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