*Almost* free-form syntax

["Danilo Tuler" <tuler@pobox.com>]

Hi,

I'm trying to write a parser for the Lua language (http://www.lua.org)
The problem is that the grammar is *almost* free-form, with one little
exception. The manual says:

"As an exception to the free-format syntax of Lua, you cannot put a line
break before the `(´ in a function call. That restriction avoids some
ambiguities in the language."

Here is a part of the grammar that is giving me headaches:

functioncall = prefix_expr args;
args = '(' expr_list? ')';
prefix_expr = '(' expr ')';

This is the ambiguity:
shift/reduce conflict in state [stack: PFunctionCall *] on TTokLparen in {
	[ P$Stat = PFunctionCall * ] followed by TTokLparen (reduce),
	[ PArgs = * TTokLparen PExprList TTokRparen ] (shift),
	[ PArgs = * TTokLparen TTokRparen ] (shift)
}

The linebreaks are thrown away by the lexer. How can I solve this??

Thanks,
Danilo