Added "%'s id" to use UUIDs and changed "% = %" to "set % = %" and some

other misc.

1 files changed, 23 insertions, 0 deletions

diff --git a/uuid.lua b/uuid.lua
new file mode 100644
index 0000000..878727b
--- /dev/null
+++ b/uuid.lua
@@ -0,0 +1,23 @@
+-- A simple UUID function based on RFC 4122: http://www.ietf.org/rfc/rfc4122.txt
+local function uuid()
+    local r = math.random
+    -- Set all the other bits to randomly (or pseudo-randomly) chosen values.
+    local bytes = {
+        r(2^(4*8)), --time-low
+        r(2^(2*8)), --time-mid
+        r(2^(2*8-4)), --time-high-and-version
+        r(2^(1*8-2)), --clock-seq-and-reserved
+        r(2^(1*8)), --clock-seq-low
+        r(2^(3*8)), r(2^(3*8)), --node
+    } 
+    -- Set the four most significant bits (bits 12 through 15) of the
+    -- time_hi_and_version field to the 4-bit version number from
+    -- Section 4.1.3.
+    bytes[3] = bit32.bor(bytes[3], 0x4000)
+    -- Set the two most significant bits (bits 6 and 7) of the
+    -- clock_seq_hi_and_reserved to zero and one, respectively.
+    bytes[4] = bit32.bor(bytes[4], 0xC0)
+    return ("%08x-%04x-%04x-%02x%02x-%6x%6x"):format(unpack(bytes))
+end
+
+return uuid