Added tointeger validator from Lua 5.3.

Author: bungle

README.md

@@ -63,8 +63,8 @@ Type validators can be used to validate the type of the validated value. These v
 * `userdata`
 * `function` or `func` (as the function is a reserved keyword in Lua)
 * `thread`
-* `integer` (works only with Lua > 5.3, `math.type(nbr) == 'integer'`)
-* `float` (works only with Lua > 5.3,   `math.type(nbr) == 'float'`)
+* `integer` (works only with Lua >= 5.3, `math.type(nbr) == 'integer'`)
+* `float` (works only with Lua >= 5.3,   `math.type(nbr) == 'float'`)
 * `file` (`io.type(value) == 'file'`)
 
 #### Example
@@ -102,6 +102,7 @@ Validation factory consist of different validators and filters used to validate
 * `unmatch(pattern[, init])`, validates that the value does not match (`string.match`) the pattern
 * `tostring()`, converts value to string
 * `tonumber([base])`, converts value to number
+* `tointeger()`, converts value to integer (works only with Lua >= 5.3, `math.tointeger'`)
 * `lower()`, converts value to lower case
 * `upper()`, converts value to upper case
 * `trim()`, trims whitespace from the left and the right

lib/resty/validation.lua

@@ -9,18 +9,21 @@ local upper = string.upper
 local pairs = pairs
 local gsub = string.gsub
 local type = type
+local iotype = io.type
+local mathtype = math.type
+local tointeger = math.tointeger
 local len = string.len
 if utf8 and utf8.len then
     len = utf8.len
 end
 local function istype(t)
     if t == "integer" or t == "float" then
         return function(value)
-            return math.type(value) == t
+            return mathtype(value) == t
         end
     elseif t == "file" then
         return function(value)
-            return io.type(value) == t
+            return iotype(value) == t
         end
     else
         return function(value)
@@ -140,6 +143,12 @@ function factory.tonumber(base)
         return nbr ~= nil, nbr
     end
 end
+function factory.tointeger()
+    return function(value)
+        local nbr = tointeger(value)
+        return nbr ~= nil, nbr
+    end
+end
 function factory.lower()
     return function(value)
         if type(value) == "string" or type(value) == "number" then