[antlr-interest] Can one identify the type of parser needed for a given BNF grammar

[The Researcher]

Douglas,

Thanks.

 This is not meant to be a real-time parser, ease of learning is more
important than speed, but quality is more important than ease of learning so
what you suggest bears some weight. But I would be willing to trade off
better documentation if a more complex solution is used.

Here are some specifics of what keeps me up at night on parsing C++, or food
for thought. While I have some ideas on this, I haven't come to a
conclusion.

In the  ISO C++ grammar for the preprocessor section is the lparen rule.

lparen: the left_parenthesis character without preceding white_space.

Another rule is H_char

h_char: any member of the source character set except new_line and > .

If the machine is ASCII it means one thing. If it is Unicode it is another.
If it is country specific it is still another.

Also, I plan to be able to parse ISO, GCC and Microsoft C++ with this.
Should it be one parser with options, three parsers, one parser with the
back end sorting it all out, or something else.
**
Thanks Eric