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- Subject: C with embedded Lua or Lua-only program?
- From: Silas Silva <silasdb@...>
- Date: Thu, 2 Sep 2010 22:55:17 -0300
I've been done some research for a project of mine, regarding
"embeddable" languages to make it extensible, and figured out that Lua
would be the best solution for this particular situation.
My question is: Lua is a language made to be embedded (like Tcl and
Guile -- not sure about the last one), not like Python or Perl, which
make it perfect to be used as a scripting language in a C program. But,
over the time, lots of libraries were built on the top of Lua, that
makes it a great general-purpose language. Should I make a C + Lua
program or only Lua? Let me explain my problem:
Over the years, I've done some GUI applications in several ways: using
Tk, Qt, HTML forms, ncurses etc. But never found a uniform way to
specify a GUI and generate the resulting code for a language/toolkit
combination. I didn't find anything like that on the internet (please,
tell me if I'm wrong) so I'll invent the wheel.
This program will read a file (whose content will be a description of a
GUI in a DSL (domain-specific language) that I intend to specify soon)
and generate the code. So, basically, some would call the program in
program --generate qt-xml < file.dsl > output.ui
program --generate html < file.dsl > output.html
The DSL should be simple (similar to Tcl/Tk code):
button foo -text "Foo" -x 10 -y 20
So, I though about using Lex & Yacc in C to parse the DSL, put
everything in well defined data structures and generate the output. The
generation rules would be in Lua scripts, something like (for HTML):
-- Oversimplified example
So, my questions are:
1. Is there any replacement for lex/flex & yacc/bison for Lua? How do
you design DSLs in Lua? I thought about using Lex & Yacc + C it is a
long standing wish of mine to learn parsers, BNF with Lex & Yacc...
2. I was thinking that it would be interesting to make the DSL
Turing-complete, to make it easily programmable. Use Lua itself as
the DSL would solve this problem, but what about if I need different
syntax not present in Lua, like in "button foo ..."?
3. Is there any reason about why to develop it in C + Lua instead of Lua
4. Am I reinventing the wheel? If yes, could you point me to open
source solutions on this problem?
Thank you very much.