EBNF Syntax of Lua
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- Subject: EBNF Syntax of Lua
- From: Nicolai Mainiero <lists@...>
- Date: 2008年1月15日 17:45:36 +0100
Hi,
I'm writing a parser for lua and found some strange rules in the EBNF
Syntax available athttp://www.lua.org/manual/5.1/manual.html#8
exp ::= nil | false | true | Number | String | `...´ | function |
prefixexp | tableconstructor | exp binop exp | unop exp
prefixexp ::= var | functioncall | `(´ exp `)´
functioncall ::= prefixexp args | prefixexp `:´ Name args
args ::= `(´ [explist] `)´ | tableconstructor | String
Looking at these four rules above the Language allowes functioncalls
like:
("Hello")"hello"
or
(nil):Test("hello")
Which are obviously senseless and when I try to execute them the
interpreter gives me the following error message:
ambiguous syntax (function call x new statement) near '('
Is this intenden behaviour or is this an error and somebody can provie
me a updated EBNF syntax.
Best regards,
Nicolai Mainiero