forgot to check in the ljson.lua library required by the test case in…

… the previous commit.

t/lib/ljson.lua

@@ -0,0 +1,89 @@
+local ngx_null = ngx.null
+local tostring = tostring
+local byte = string.byte
+local gsub = string.gsub
+local sort = table.sort
+local pairs = pairs
+local ipairs = ipairs
+local concat = table.concat
+
+local ok, new_tab = pcall(require, "table.new")
+if not ok then
+    new_tab = function (narr, nrec) return {} end
+end
+
+local _M = {}
+
+local metachars = {
+    ['\t'] = '\\t',
+    ["\\"] = "\\\\",
+    ['"'] = '\\"',
+    ['\r'] = '\\r',
+    ['\n'] = '\\n',
+}
+
+local function encode_str(s)
+    -- XXX we will rewrite this when string.buffer is implemented
+    -- in LuaJIT 2.1 because string.gsub cannot be JIT compiled.
+    return gsub(s, '["\\\r\n\t]', metachars)
+end
+
+local function is_arr(t)
+    local exp = 1
+    for k, _ in pairs(t) do
+        if k ~= exp then
+            return nil
+        end
+        exp = exp + 1
+    end
+    return exp - 1
+end
+
+local encode
+
+encode = function (v)
+    if v == nil or v == ngx_null then
+        return "null"
+    end
+
+    local typ = type(v)
+    if typ == 'string' then
+        return '"' .. encode_str(v) .. '"'
+    end
+
+    if typ == 'number' or typ == 'boolean' then
+        return tostring(v)
+    end
+
+    if typ == 'table' then
+        local n = is_arr(v)
+        if n then
+            local bits = new_tab(n, 0)
+            for i, elem in ipairs(v) do
+                bits[i] = encode(elem)
+            end
+            return "[" .. concat(bits, ",") .. "]"
+        end
+
+        local keys = {}
+        local i = 0
+        for key, _ in pairs(v) do
+            i = i + 1
+            keys[i] = key
+        end
+        sort(keys)
+
+        local bits = new_tab(0, i)
+        i = 0
+        for _, key in ipairs(keys) do
+            i = i + 1
+            bits[i] = encode(key) .. ":" .. encode(v[key])
+        end
+        return "{" .. concat(bits, ",") .. "}"
+    end
+
+    return '"<' .. typ .. '>"'
+end
+_M.encode = encode
+
+return _M