Re: Yieldable/streaming LPEG
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- Subject: Re: Yieldable/streaming LPEG
- From: Petite Abeille <petite.abeille@...>
- Date: Mon, 1 Sep 2014 23:17:23 +0200
On Sep 1, 2014, at 11:02 PM, Sean Conner <sean@conman.org> wrote:
> I thought that you could yield through a C-call boundary in Lua 5.2.
I guess not always, e.g.:
local function gfind( aString, aPattern, isPlain )
assert( type( aString ) == 'string' )
assert( type( aPattern ) == 'string' )
assert( aPattern:len() > 0 )
if isPlain then aPattern = aPattern:gsub( '%p', '%%%1' ) end
aPattern = ( '()(%s)()' ):format( aPattern )
return coroutine.wrap( function() aString:gsub( aPattern, function( aStart, aValue, anEnd ) coroutine.yield( aStart, anEnd - 1, aValue ) end ) end )
end
for aStart, anEnd in gfind( aString, aPattern ) do
print( aStart, anEnd, ( '%q' ):format( aString:sub( aStart, anEnd ) ) )
end
lua: attempt to yield across a C-call boundary
stack traceback:
[C]: in function 'for iterator'