From: Jonathan Paisley <jp-www@...>
Date: 2005-03-17T02:49:46+09:00
Subject: Re: Examples for racc?

On Thu, 17 Mar 2005 01:59:14 +0900, Ben Giddings wrote:

> To do that, I want to parse this:
> 
> gcc -D__DEBUG__ -I../include -I/foo/bar/path -funroll-loops -o foo foo.c
> 
> to this:
> 
> #<GCCInvocation:0x4029a1f4 @lang_opts=["unroll-loops"], 
> @includes=["../include", "/path/to/foo"], @defines=["DEBUG"], 
> @sources=["foo.c"], @output="foo">
> 
> In other words, I want to make an object with the parsed commandline.

Perhaps it is sufficient to scan the line a couple of times with some
regular expressions? e.g.:

class GCCInvocation
  def initialize(line)
    @includes = []
    @lang_opts = []
    @output = ""
    @defines = []
    @sources = []
    line = " " + line
    line.gsub!(/ -I ?(\S+)/) { @includes << $1; "" }
    line.gsub!(/ -f ?(\S+)/) { @lang_opts << $1; "" }
    line.gsub!(/ -o ?(\S+)/) { @output = $1; "" } 
    line.gsub!(/ -D ?(\S+)/) { @defines << $1; "" }
    line.gsub!(/ ([^- ]\S+)/) { @sources << $1 }
    @remainder = line.squeeze(' ')
  end
end


while line = gets
  case line
  when /^gcc (.*)$/
    p GCCInvocation.new($1)
  end
end