Re: Writing a parser

It looks like you can just iterate over the lines, and check with regexes if the line starts with #, and split at whitespaces.

But you have to be a bit more specific about the syntax, and what you want the parser to do with it (generate a parse tree? or an abstract syntax tree? Or execute it straight away?)

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Re^2: Writing a parser by pc88mxer (Vicar) on Jan 29, 2008 at 20:21 UTC
Just based on what you are telling us, I would second this approach. I've written the following code many times: `while (<FH>) { s/#.*$//; my @args = split(' ', $_); next unless @args; ... process command ... }` [download] If, however, you have any recursive syntactical elements (like begin/end grouping symbols which need to be matched), a proper parser written with `Parser::RecDescent` is probably in order.	[reply] [d/l] [select]

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Re^2: Writing a parser
by pc88mxer (Vicar) on Jan 29, 2008 at 20:21 UTC

while (<FH>) {
    s/#.*$//;
    my @args = split(' ', $_);
    next unless @args;
    ... process command ...
}
[download]

If, however, you have any recursive syntactical elements (like begin/end grouping symbols which need to be matched), a proper parser written with Parser::RecDescent is probably in order.

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