[ANN] New release of LuaMacro
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- Subject: [ANN] New release of LuaMacro
- From: "steve donovan" <steve.j.donovan@...>
- Date: 2008年1月15日 14:30:19 +0200
Hi guys,
http://lua-users.org/wiki/LuaMacros
has the write-up;
http://luaforge.net/frs/?group_id=328
has the files.
Main feature of this release is: no more silly token literals. That
is, a simple macro is now just:
macro.define('PLUS',{'L','C'},' ((L)+(C)) ')
I've improved the try/catch definition; this kind of code now works as
you would expect - previously one could not return out of a nested try
block.
function test_try_except(x,y)
try
x.a = 10
try
y.a = 10
return 1
except(e)
return 3
end
except(e)
return 2
end
end
Another example is a little bit of sugar for defining Lua classes:
class Animal is
-- _init is a special constructor method, invoked by class.new
function _init(self,name)
self.name = name
end
-- you don't have to qualify method names, since our environment
-- is the class metatable!
function speak(self)
print ('growl '..self:get_name())
end
function get_name(self)
return self.name
end
endclass
class Dog(Animal) is
-- necessary to explicitly call the base class ctor
function _init(self,name)
_base._init(self,name)
end
function speak(self)
G.print('bark '..self:get_name())
end
endclass
As always, macros work best when they provide a thin sugar coating
over the Lua syntax. In the above case, 'class Dog(Animal) is' expands
to 'Dog = _class(Animal,function()' and 'endclass' to 'end)'.
steve d.