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|
-- Define useful global stuff.
local utillib = {}
function utillib.tableClone( org )
return { table.unpack( org ) }
end
function utillib.deepCopy( orig )
local copy
if type( orig ) == "table" then
copy = {}
for origKey, origValue in next, orig, nil do
-- If object has clone method use that. Mainly for vector libraries.
if type( origValue ) == "table" and type( origValue.clone ) == "function" then
copy[ utillib.deepCopy( origKey ) ] = orig_value:clone()
else
copy[ utillib.deepCopy( origKey ) ] = utillib.deepCopy( origValue )
end
end
setmetatable( copy, utillib.deepCopy( getmetatable( orig ) ) )
else -- number, string, boolean, etc.
copy = orig
end
return copy
end
function utillib.sign( v )
if 0 <= v then
return 1
elseif v < 0 then
return -1
end
end
function utillib.clamp( val, min, max )
return math.max( min, math.min( val, max ) )
end
-- Returns changed value ( value to be changed, index, bit )
function utillib.setBit( v, i, b )
if b then
return v | 1 << i
else
return v & ~( 1 << i )
end
end
function utillib.toggleBit( v, i )
return v ~ ( 1 << i )
end
function utillib.getBit( v, i )
if v == nil then
return false
end
return v & ( 1 << i ) > 0
end
function utillib.utf8Sub( s, i, j )
i = i or 1
j = j or -1
if i < 1 or j < 1 then
local n = utf8.len(s)
if not n then return nil end
if i < 0 then i = n + 1 + i end
if j < 0 then j = n + 1 + j end
if i < 0 then i = 1 elseif i > n then i = n end
if j < 0 then j = 1 elseif j > n then j = n end
end
if j < i then return "" end
i = utf8.offset( s, i )
j = utf8.offset( s, j + 1 )
if i and j then
return s:sub( i, j - 1 )
elseif i then
return s:sub( i )
else
return ""
end
end
function utillib.round( v )
return math.tointeger( v + 0.5 - ( v + 0.5 ) % 1 )
end
function utillib.tableLen( t )
local count = 0
for _ in pairs(t) do
count = count + 1
end
return count
end
function utillib.split( str, sep )
if sep == nil then
sep = "%s"
end
local t = {}
for str in string.gmatch( str, "([^"..sep.."]+)" ) do
table.insert( t, str )
end
return t
end
function utillib.wrapAngleDeg( angle )
if angle < 0 then
return math.fmod( angle, 360.0 ) + 360.0
else
return math.fmod( angle, 360.0 )
end
end
function utillib.wrapAngleRad( angle )
if angle < 0 then
return math.fmod( angle, PI * 2 ) + PI * 2
else
return math.fmod( angle, PI * 2 )
end
end
function utillib.lerp( a, b, f )
return ( a * ( 1.0 - f ) ) + ( b * f )
end
function utillib.toBoolean( v )
if type( v ) == "string" then
if v == "1" or string.lower( v ) == "true" then
return true
elseif v == "0" or string.lower( v ) == "false" then
return false
end
elseif type( v ) == "number" then
return 0 < v
end
return false
end
return utillib
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