Re: [linux-audio-dev] Command parser?

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Subject: Re: [linux-audio-dev] Command parser?
From: Erik Steffl (esteffl_AT_pbi.net)
Date: Wed Aug 23 2000 - 00:02:09 EEST


  there are several options:

  use perl and regular expressions

  use regular expressions in C or C++ (there are some fairly convenient
libraries, at least I've heard so)

  use strtok function + other string fuintctions in C (fairly
cumbersome)

  lex and yacc (or flex&bizon) is probably the most elegant choice, if
you do not have experience with these tools it might be a good way to
learn more about parsing, but if you only want to get job done it might
require too much learning...

        erik

Juhana Sadeharju wrote:
>
> Hello. I need to read simple commands from a file and execute the commands
> as they are read. What would be a good system for reading them?
>
> Actually, I think parsing a file is most difficult programming task.
> For example, a simple fscanf could not find "%i patents" string
> from the file even the file had one. Yep, I'm writing a system to
> automatically notify me if new patents has arrived in the audio classes
> and a system to keep up what patents I have already seen or downloaded.
>
> Anyway, now I need a simple language for an audio project. The file
> format would be following.
>
> command1 <float>
> command2 <int> <int> <float>
> command3 <string> <float> <float>
>
> I have started to write a simple parser which finds first command,
> and then reads as many parameters as the command has, and then another
> command. It will exit the program if an error is found. First problem
> is: how to find the commands and parameters? With fscanf(..,"%s",..)
> and fscanf(..,"%f",..), and so on? How about comment lines?
>
> Or should I use Bison? Can Guile be used? Python? What does Guile and
> Python code look a like? Any others? Would they work with the patent
> file problem? I.e., finding a string from an entire file.
>
> I would be willing to use more complex parser than what I have started
> to write because later I sure will need something more complex in my
> wave editor.
>
> Regards,
>
> Juhana


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