Re: Lpeg grammar questions
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- Subject: Re: Lpeg grammar questions
- From: Simon Cozens <simon@...>
- Date: 2014年2月12日 22:56:47 +0900
On 12/02/2014 22:42, Duncan Cross wrote:
Looks like a typo here...? "linenum" is just thrown away, when it
looks like it should probably be the second parameter of Cg().
Good catch - but even with:
local incrementline = Cg( (Cb("linenum") / function ( a ) print("NL");
return a + 1 end), "linenum")
The function still doesn't fire:
> texlike:match("foo \n bar")
New
{
line = 1,
text = [[foo
bar]],
}
Here's an even more reduced case:
local newline = P"\r"^-1 * "\n" / function (a) print("newline"); end
local incrementline = Cg ( Cb"linenum" / function ( a )
print("incrementline"); return a + 1 end , "linenum" )
local setup = Cg ( Cc ( 1) , "linenum" )
local test = (setup * newline * incrementline):match("\n")
test:match("\n")
Produces:
newline
Why doesn't incrementline do anything when it matches? (Incidentally, I've
just tried the example where I got this pattern from and it doesn't work. :( )