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Re: gnubol: refmod again (fwd)
At 02:46 AM 12/2/99 +1000, Tim Josling wrote:
[stuff deleted]
>There is still an ambiguity as far as I can tell.
>
>A( I (2)).
>
>This could be two arguments or one.
>
>"I" and "(2)"
>OR "I (2)".
>
>Does it matter if I is an array or not? For example, if I is an array,
then I guess
>it should be one argument. If not, then it should not be.
>
>But not all contexts require an array reference after the array name (eg
in search
>verb). This could be ugly to handle. Have I missed something? I intend to
email the
>committee about this.
[more deleted]
There is no ambiguity that you cannot resolve by looking up the definition
of I. If I is an array or a function that accepts argument(s), than it
requires a left parenthesis to follow, et cetera. If I is neither an array
nor a function, or if the context is that of what the standard refers to as
a Data-name rather than as an Expression or an Identifier, or a Fully
Qualified whatever, than the above presents A with two arguments or
indexes, depending on A's definition. Of course, if A is neither an array
nor a function, than it is just an element in an expression list, and the
interpretation of the expression that follows it is independent of A --
lets not let the absense of a space between A and the left parenthesis
mislead us.
Bottom line: COBOL parsing requires context sensitivity and frequent symbol
table lookups.
Jonathan
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