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annotate framework/env/execute/chunk.lua @ 205:48ee8826efbe

Correct handling of nil's in return tuples in execute.chunk{...}
author jbe
date Fri Jan 09 21:32:23 2015 +0100 (2015-01-09)
parents 3d43a5cf17c1
children eb3e236d261d
rev   line source
poelzi@31 1 --[[--
jbe@46 2 return_value = -- return value of executed chunk
jbe@46 3 execute.chunk{
poelzi@31 4 file_path = file_path, -- path to a lua source or byte-code file
poelzi@31 5 app = app, -- app name to use or the current will be used
poelzi@31 6 module = module, -- module where chunk is located
jbe@46 7 chunk = chunk -- name of chunk (filename without .lua extension)
poelzi@32 8 id = id, -- id to be returned by param.get_id(...) during execution
poelzi@32 9 params = params -- parameters to be returned by param.get(...) during execution
poelzi@31 10 }
poelzi@31 11
jbe@205 12 This function loads and executes a lua file specified by a given path or constructs a path to load from the module and chunk name. A chunk name should always begin with an underscore. All return values of the loaded and executed chunk are returned by this function as well.
poelzi@31 13
poelzi@31 14 --]]--
poelzi@31 15
jbe@205 16 local function pack_return_values(...)
jbe@205 17 local storage = {...}
jbe@205 18 storage.n = select("#", ...)
jbe@205 19 end
jbe@205 20
jbe@205 21 local function unpack_return_values(storage)
jbe@205 22 return table.unpack(storage, 1, storage.n)
jbe@205 23 end
jbe@205 24
jbe@46 25 function execute.chunk(args)
poelzi@31 26 local file_path = args.file_path
poelzi@31 27 local app = args.app
poelzi@31 28 local module = args.module
poelzi@31 29 local chunk = args.chunk
poelzi@32 30 local id = args.id
poelzi@32 31 local params = args.params
poelzi@31 32
poelzi@31 33 app = app or request.get_app_name()
poelzi@31 34
jbe@46 35 file_path = file_path or encode.file_path(
jbe@46 36 request.get_app_basepath(),
jbe@46 37 'app', app, module, chunk .. '.lua'
jbe@46 38 )
poelzi@32 39
poelzi@31 40 local func, load_errmsg = loadfile(file_path)
poelzi@31 41 if not func then
poelzi@31 42 error('Could not load file "' .. file_path .. '": ' .. load_errmsg)
poelzi@31 43 end
poelzi@32 44
poelzi@32 45 if id or params then
poelzi@32 46 param.exchange(id, params)
poelzi@32 47 end
poelzi@32 48
jbe@205 49 local result = pack_return_values(func())
poelzi@32 50
poelzi@32 51 if id or params then
poelzi@32 52 param.restore()
poelzi@32 53 end
poelzi@32 54
jbe@205 55 return unpack_return_values(result)
poelzi@31 56 end

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