Difference between revisions of "love.filesystem.load"

(A safer method of loading & executing a lua file with love.filesystem.load)
Line 28: Line 28:
  
 
<source lang="lua">
 
<source lang="lua">
chunk = love.filesystem.load( name ) -- load the chunk
+
local ok, chunk, result
local ok, errMsg = pcall(chunk) -- execute the chunk safely
+
ok, chunk = pcall( love.filesystem.load, name ) -- load the chunk safely
 +
if not ok then
 +
  print('The following error happend: ' .. tostring(chunk))
 +
else
 +
  ok, result = pcall(chunk) -- execute the chunk safely
  
if not ok then -- will be false if there is an error
+
  if not ok then -- will be false if there is an error
  print('The following error happened: ' .. tostring(errMsg))
+
    print('The following error happened: ' .. tostring(result))
else
+
  else
  print('The result of loading is: ' .. tostring(errMsg))
+
    print('The result of loading is: ' .. tostring(result))
 +
  end
 
end
 
end
 
</source>
 
</source>

Revision as of 07:55, 2 May 2011

Load a file (but not run it)

Function

Synopsis

chunk = love.filesystem.load( name )

Arguments

string name
The name (and path) of the file

Returns

function chunk
The loaded chunk

Example

It is important to note that love.filesystem.load does not invoke the code, it just creates a function (a 'chunk') that will contain the contents of the file inside it. In order to execute the chunk, you have to put () behind it.

Also, it is worth noting that loaded files can return values. For example, the following file:

return 1+1

Will return 2, when called like this:

chunk = love.filesystem.load( name ) -- load the chunk
local result = chunk() -- execute the chunk
print('result: ' .. tostring(result)) -- prints 'result: 2'

This bluescreens if there is a syntax error in the loaded file. If you want to continue your game if the file is not valid (for example if you expect it to be written by users), you can protect the calling of the chunk with pcall:

local ok, chunk, result
ok, chunk = pcall( love.filesystem.load, name ) -- load the chunk safely
if not ok then
  print('The following error happend: ' .. tostring(chunk))
else
  ok, result = pcall(chunk) -- execute the chunk safely

  if not ok then -- will be false if there is an error
    print('The following error happened: ' .. tostring(result))
  else
    print('The result of loading is: ' .. tostring(result))
  end
end

See Also


Other Languages