Author: Stan Eisenstat
Subject: Re: [Cs323] checking input
Date: Monday, 21 Sep 2020, 21:44:19

    > Message Posted By: Unknown
    >
    > Would you suggest checking input (i.e. file after redirect) while parsing
    > the command line arguments, or when we are building a tree (assuming that
    > we do these in two separate steps).

There are three stages:
1) break the command into tokens
2) check for syntax errors
3) build the parse tree
which may be done sequentially (1 then 2 then 3),
or partly in parallel (1+2 then 3 or 1 then 2+3) or
entirely in parallel (1+2+3).

Pick whichever is easiest for you to implement.

--Stan-