libs/web: implement minlength(), maxlength() and rangelength() datatypes

libs/web/htdocs/luci-static/resources/cbi.js

@@ -216,6 +216,33 @@ var cbi_validators = {
 		return false;
 	},
 
+	'rangelength': function(min, max)
+	{
+		var val = '' + this;
+		if (!isNaN(min) && !isNaN(max))
+			return ((val.length >= min) && (val.length <= max));
+
+		return false;
+	},
+
+	'minlength': function(min)
+	{
+		var val = '' + this;
+		if (!isNaN(min))
+			return (val.length >= min);
+
+		return false;
+	},
+
+	'maxlength': function(max)
+	{
+		var val = '' + this;
+		if (!isNaN(max))
+			return (val.length <= max);
+
+		return false;
+	},
+
 	'or': function()
 	{
 		for (var i = 0; i < arguments.length; i += 2)

libs/web/luasrc/cbi/datatypes.lua

@@ -17,7 +17,7 @@ local fs = require "nixio.fs"
 local ip = require "luci.ip"
 local math = require "math"
 local util = require "luci.util"
-local tonumber, type, unpack, select = tonumber, type, unpack, select
+local tonumber, tostring, type, unpack, select = tonumber, tostring, type, unpack, select
 
 
 module "luci.cbi.datatypes"
@@ -306,6 +306,40 @@ function max(val, max)
 	return false
 end
 
+function rangelength(val, min, max)
+	val = tostring(val)
+	min = tonumber(min)
+	max = tonumber(max)
+
+	if val ~= nil and min ~= nil and max ~= nil then
+		return ((#val >= min) and (#val <= max))
+	end
+
+	return false
+end
+
+function minlength(val, min)
+	val = tostring(val)
+	min = tonumber(min)
+
+	if val ~= nil and min ~= nil then
+		return (#val >= min)
+	end
+
+	return false
+end
+
+function maxlength(val, max)
+	val = tostring(val)
+	max = tonumber(max)
+
+	if val ~= nil and max ~= nil then
+		return (#val <= max)
+	end
+
+	return false
+end
+
 function phonedigit(val)
 	return (val:match("^[0-9\*#]+$") ~= nil)
 end