The latest lpeg(0.12.1) does not support left-recuision #2

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FreeBlues opened this issue Jul 5, 2017 · 0 comments

FreeBlues commented Jul 5, 2017

The latest lpeg(0.12.1) does not support left-recuision, alway throw error "empty loop in rule ..."

So the grammar in parser.lua should remove the left-recursion.

I found these syntax used left-recursion:

prefixexp ::= var | functioncall | ‘(’ exp ‘)’
functioncall ::= prefixexp args | prefixexp ‘:’ Name args
var ::= Name | prefixexp ‘[’ exp ‘]’ | prefixexp ‘.’ Name

and this:

exp ::= nil | false | true | Numeral | LiteralString | ‘...’ | functiondef |
prefixexp | tableconstructor | exp binop exp | unop exp

I know the errors but can not correct them because I am studying the LPEG now and have not got it.

Please correct them or waiting for me until I had understood the LPEG clearly.

Sorry for my poor english.

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