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local libraryUtil = {}
function libraryUtil.checkType( name, argIdx, arg, expectType, nilOk )
if arg == nil and nilOk then
return
end
if type( arg ) ~= expectType then
local msg = string.format( "bad argument #%d to '%s' (%s expected, got %s)",
argIdx, name, expectType, type( arg )
)
error( msg, 3 )
end
end
function libraryUtil.checkTypeMulti( name, argIdx, arg, expectTypes )
local argType = type( arg )
for _, expectType in ipairs( expectTypes ) do
if argType == expectType then
return
end
end
local n = #expectTypes
local typeList
if n > 1 then
typeList = table.concat( expectTypes, ', ', 1, n - 1 ) .. ' or ' .. expectTypes[n]
else
typeList = expectTypes[1]
end
local msg = string.format( "bad argument #%d to '%s' (%s expected, got %s)",
argIdx,
name,
typeList,
type( arg )
)
error( msg, 3 )
end
function libraryUtil.checkTypeForIndex( index, value, expectType )
if type( value ) ~= expectType then
local msg = string.format( "value for index '%s' must be %s, %s given",
index, expectType, type( value )
)
error( msg, 3 )
end
end
function libraryUtil.checkTypeForNamedArg( name, argName, arg, expectType, nilOk )
if arg == nil and nilOk then
return
end
if type( arg ) ~= expectType then
local msg = string.format( "bad named argument %s to '%s' (%s expected, got %s)",
argName, name, expectType, type( arg )
)
error( msg, 3 )
end
end
function libraryUtil.makeCheckSelfFunction( libraryName, varName, selfObj, selfObjDesc )
return function ( self, method )
if self ~= selfObj then
error( string.format(
"%s: invalid %s. Did you call %s with a dot instead of a colon, i.e. " ..
"%s.%s() instead of %s:%s()?",
libraryName, selfObjDesc, method, varName, method, varName, method
), 3 )
end
end
end
return libraryUtil
|
