Upgrade ParamParser to make it more convinient.

It now decouples `env.params` to `env.params.query`, `env.params.body`,
`env.params.json` and `env.params.url` and you still can access merged
values using `env.params.all`

src/kemal/context.cr

@@ -2,9 +2,10 @@
 # information such as params, content_type e.g
 class HTTP::Server
   class Context
+
     def params
       @request.url_params = route_lookup.params
-      @params ||= Kemal::ParamParser.new(@request).parse
+      @params ||= Kemal::ParamParser.new(@request).params
     end
 
     def redirect(url, status_code = 302)

src/kemal/param_parser.cr

@@ -5,16 +5,34 @@ require "json"
 # context.
 alias AllParamTypes = Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type)
 
+class Kemal::ParamContainer
+  getter url
+  getter query
+  getter body
+  getter json
+
+  def initialize(@url, @query, @body, @json)
+  end
+
+  def all
+    @url.merge(@query).merge(@body).merge(@json)
+  end
+end
+
 class Kemal::ParamParser
   URL_ENCODED_FORM = "application/x-www-form-urlencoded"
   APPLICATION_JSON = "application/json"
 
   def initialize(@request)
-    @params = {} of String => AllParamTypes
+    @url = {} of String => String
+    @query = {} of String => String
+    @body = {} of String => String
+    @json = {} of String => AllParamTypes
   end
 
-  def parse
+  def params
     parse_request
+    Kemal::ParamContainer.new(@url, @query, @body, @json)
   end
 
   def parse_request
@@ -22,22 +40,21 @@ class Kemal::ParamParser
     parse_body
     parse_json
     parse_url_params
-    @params
   end
 
   def parse_body
     return if (@request.headers["Content-Type"]? =~ /#{URL_ENCODED_FORM}/).nil?
-    parse_part(@request.body)
+    @body = parse_part(@request.body)
   end
 
   def parse_query
-    parse_part(@request.query)
+    @query = parse_part(@request.query)
   end
 
   def parse_url_params
     if params = @request.url_params
       params.each do |key, value|
-        @params[key] = value
+        @url[key as String] = value as String
       end
     end
   end
@@ -52,18 +69,21 @@ class Kemal::ParamParser
     body = @request.body as String
     case json = JSON.parse(body).raw
     when Hash
-      json.each do |k, v|
-        @params[k as String] = v as AllParamTypes
+      json.each do |key, value|
+        @json[key as String] = value as AllParamTypes
       end
     when Array
-      @params["_json"] = json
+      @json["_json"] = json
     end
   end
 
   def parse_part(part)
-    return unless part
-    HTTP::Params.parse(part) do |key, value|
-      @params[key] ||= value
+    part_params = {} of String => String
+    if part
+      HTTP::Params.parse(part) do |key, value|
+        part_params[key as String] ||= value as String
+      end
     end
+    part_params
   end
 end

src/kemal/request.cr

@@ -11,7 +11,7 @@ class HTTP::Request
   private def check_for_method_override!
     @override_method = @method
     if @method == "POST"
-      params = Kemal::ParamParser.new(self).parse_request
+      params = Kemal::ParamParser.new(self).params.all
       if params.has_key?("_method") && HTTP::Request.override_method_valid?(params["_method"])
         @override_method = params["_method"]
       end