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drop misleading comment copy-pasted from Module:String
local p = {}
--[[
Helper function that populates the argument list given that user may need to use a mix of
named and unnamed parameters. This is relevant because named parameters are not
identical to unnamed parameters due to string trimming, and when dealing with strings
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
function p.getParameters( frame_args, arg_list )
local new_args = {};
local index = 1;
local value;
for i,arg in ipairs( arg_list ) do
value = frame_args[arg]
if value == nil then
value = frame_args[index];
index = index + 1;
end
new_args[arg] = value;
end
return new_args;
end
--[[
Helper Function to interpret boolean strings
]]
function p.getBoolean( boolean_str )
local boolean_value;
if type( boolean_str ) == 'string' then
boolean_str = boolean_str:lower();
if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
or boolean_str == '' then
boolean_value = false;
else
boolean_value = true;
end
elseif type( boolean_str ) == 'boolean' then
boolean_value = boolean_str;
else
error( 'No boolean value found' );
end
return boolean_value
end
function p.defined(frame)
local arg = mw.text.trim(frame.args[1])
--if arg == tostring(tonumber(arg)) then -- undesired result for '-0'
-- arg = tonumber(arg)
--end
--if mw.ustring.find(arg, '^%s*-?[1-9][0-9]*%s*$') ~= nil or arg == '0' then
-- arg = tonumber(arg)
--end
if mw.ustring.find(arg, '^-?[1-9][0-9]*$') ~= nil then
arg = tonumber(arg)
elseif arg == '0' then
arg = 0
end
return frame:getParent().args[arg] ~= nil
end
return p
--[[
Helper function that populates the argument list given that user may need to use a mix of
named and unnamed parameters. This is relevant because named parameters are not
identical to unnamed parameters due to string trimming, and when dealing with strings
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
function p.getParameters( frame_args, arg_list )
local new_args = {};
local index = 1;
local value;
for i,arg in ipairs( arg_list ) do
value = frame_args[arg]
if value == nil then
value = frame_args[index];
index = index + 1;
end
new_args[arg] = value;
end
return new_args;
end
--[[
Helper Function to interpret boolean strings
]]
function p.getBoolean( boolean_str )
local boolean_value;
if type( boolean_str ) == 'string' then
boolean_str = boolean_str:lower();
if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
or boolean_str == '' then
boolean_value = false;
else
boolean_value = true;
end
elseif type( boolean_str ) == 'boolean' then
boolean_value = boolean_str;
else
error( 'No boolean value found' );
end
return boolean_value
end
function p.defined(frame)
local arg = mw.text.trim(frame.args[1])
--if arg == tostring(tonumber(arg)) then -- undesired result for '-0'
-- arg = tonumber(arg)
--end
--if mw.ustring.find(arg, '^%s*-?[1-9][0-9]*%s*$') ~= nil or arg == '0' then
-- arg = tonumber(arg)
--end
if mw.ustring.find(arg, '^-?[1-9][0-9]*$') ~= nil then
arg = tonumber(arg)
elseif arg == '0' then
arg = 0
end
return frame:getParent().args[arg] ~= nil
end
return p