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`

spec/param_parser_spec.cr

@@ -3,19 +3,31 @@ require "./spec_helper"
 describe "ParamParser" do
   it "parses query params" do
     route = Route.new "POST", "/" do |env|
-      hasan = env.params["hasan"]
+      hasan = env.params.query["hasan"]
       "Hello #{hasan}"
     end
     request = HTTP::Request.new("POST", "/?hasan=cemal")
-    params = Kemal::ParamParser.new(request).parse
-    params["hasan"].should eq "cemal"
+    query_params = Kemal::ParamParser.new(request).params.query
+    query_params["hasan"].should eq "cemal"
+  end
+
+  it "parses url params" do
+    kemal = Kemal::RouteHandler::INSTANCE
+    kemal.add_route "POST", "/hello/:hasan" do |env|
+      "hello #{env.params.url["hasan"]}"
+    end
+    request = HTTP::Request.new("POST", "/hello/cemal")
+    # Radix tree MUST be run to parse url params.
+    io_with_context = create_request_and_return_io(kemal, request)
+    url_params = Kemal::ParamParser.new(request).params.url
+    url_params["hasan"].should eq "cemal"
   end
 
   it "parses request body" do
     route = Route.new "POST", "/" do |env|
-      name = env.params["name"]
-      age = env.params["age"]
-      hasan = env.params["hasan"]
+      name = env.params.query["name"]
+      age = env.params.query["age"]
+      hasan = env.params.body["hasan"]
       "Hello #{name} #{hasan} #{age}"
     end
 
@@ -26,8 +38,11 @@ describe "ParamParser" do
       headers: HTTP::Headers{"Content-Type": "application/x-www-form-urlencoded"},
     )
 
-    params = Kemal::ParamParser.new(request).parse
-    params.should eq({"hasan" => "cemal", "name" => "serdar", "age" => "99"})
+    query_params = Kemal::ParamParser.new(request).params.query
+    query_params.should eq({"hasan" => "cemal"})
+
+    body_params = Kemal::ParamParser.new(request).params.body
+    body_params.should eq({"name" => "serdar", "age" => "99"})
   end
 
   context "when content type is application/json" do
@@ -41,8 +56,8 @@ describe "ParamParser" do
         headers: HTTP::Headers{"Content-Type": "application/json"},
       )
 
-      params = Kemal::ParamParser.new(request).parse
-      params.should eq({"name": "Serdar"})
+      json_params = Kemal::ParamParser.new(request).params.json
+      json_params.should eq({"name": "Serdar"})
     end
 
     it "parses request body for array" do
@@ -55,8 +70,8 @@ describe "ParamParser" do
         headers: HTTP::Headers{"Content-Type": "application/json"},
       )
 
-      params = Kemal::ParamParser.new(request).parse
-      params.should eq({"_json": [1]})
+      json_params = Kemal::ParamParser.new(request).params.json
+      json_params.should eq({"_json": [1]})
     end
 
     it "parses request body and query params" do
@@ -69,8 +84,11 @@ describe "ParamParser" do
         headers: HTTP::Headers{"Content-Type": "application/json"},
       )
 
-      params = Kemal::ParamParser.new(request).parse
-      params.should eq({"foo": "bar", "_json": [1]})
+      query_params = Kemal::ParamParser.new(request).params.query
+      query_params.should eq({"foo": "bar"})
+
+      json_params = Kemal::ParamParser.new(request).params.json
+      json_params.should eq({"_json": [1]})
     end
 
     it "handles no request body" do
@@ -82,17 +100,26 @@ describe "ParamParser" do
         headers: HTTP::Headers{"Content-Type": "application/json"},
       )
 
-      params = Kemal::ParamParser.new(request).parse
-      params.should eq({} of String => AllParamTypes)
+      url_params = Kemal::ParamParser.new(request).params.url
+      url_params.should eq({} of String => String)
+
+      query_params = Kemal::ParamParser.new(request).params.query
+      query_params.should eq({} of String => String)
+
+      body_params = Kemal::ParamParser.new(request).params.body
+      body_params.should eq({} of String => String)
+
+      json_params = Kemal::ParamParser.new(request).params.json
+      json_params.should eq({} of String => AllParamTypes)
     end
   end
 
   context "when content type is incorrect" do
     it "does not parse request body" do
       route = Route.new "POST", "/" do |env|
-        name = env.params["name"]
-        age = env.params["age"]
-        hasan = env.params["hasan"]
+        name = env.params.body["name"]
+        age = env.params.body["age"]
+        hasan = env.params.query["hasan"]
         "Hello #{name} #{hasan} #{age}"
       end
 
@@ -103,8 +130,11 @@ describe "ParamParser" do
         headers: HTTP::Headers{"Content-Type": "text/plain"},
       )
 
-      params = Kemal::ParamParser.new(request).parse
-      params.should eq({"hasan" => "cemal"})
+      query_params = Kemal::ParamParser.new(request).params.query
+      query_params.should eq({"hasan" => "cemal"})
+
+      body_params = Kemal::ParamParser.new(request).params.body
+      body_params.should eq({} of String => String)
     end
   end
 end

spec/route_handler_spec.cr

@@ -15,7 +15,7 @@ describe "Kemal::RouteHandler" do
   it "routes request with query string" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/" do |env|
-      "hello #{env.params["message"]}"
+      "hello #{env.params.query["message"]}"
     end
     request = HTTP::Request.new("GET", "/?message=world")
     io_with_context = create_request_and_return_io(kemal, request)
@@ -26,7 +26,7 @@ describe "Kemal::RouteHandler" do
   it "routes request with multiple query strings" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/" do |env|
-      "hello #{env.params["message"]} time #{env.params["time"]}"
+      "hello #{env.params.query["message"]} time #{env.params.query["time"]}"
     end
     request = HTTP::Request.new("GET", "/?message=world&time=now")
     io_with_context = create_request_and_return_io(kemal, request)
@@ -37,7 +37,7 @@ describe "Kemal::RouteHandler" do
   it "route parameter has more precedence than query string arguments" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/:message" do |env|
-      "hello #{env.params["message"]}"
+      "hello #{env.params.url["message"]}"
     end
     request = HTTP::Request.new("GET", "/world?message=coco")
     io_with_context = create_request_and_return_io(kemal, request)
@@ -48,8 +48,8 @@ describe "Kemal::RouteHandler" do
   it "parses simple JSON body" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "POST", "/" do |env|
-      name = env.params["name"]
-      age = env.params["age"]
+      name = env.params.json["name"]
+      age = env.params.json["age"]
       "Hello #{name} Age #{age}"
     end
 
@@ -68,7 +68,7 @@ describe "Kemal::RouteHandler" do
   it "parses JSON with string array" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "POST", "/" do |env|
-      skills = env.params["skills"] as Array
+      skills = env.params.json["skills"] as Array
       "Skills #{skills.each.join(',')}"
     end
 
@@ -87,7 +87,7 @@ describe "Kemal::RouteHandler" do
   it "parses JSON with json object array" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "POST", "/" do |env|
-      skills = env.params["skills"] as Array
+      skills = env.params.json["skills"] as Array
       skills_from_languages = skills.map do |skill|
         skill = skill as Hash
         skill["language"]

spec/view_spec.cr

@@ -8,7 +8,7 @@ describe "Views" do
   it "renders file" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/view/:name" do |env|
-      name = env.params["name"]
+      name = env.params.url["name"]
       render "spec/asset/hello.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
@@ -20,7 +20,7 @@ describe "Views" do
   it "renders file with dynamic variables" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/view/:name" do |env|
-      name = env.params["name"]
+      name = env.params.url["name"]
       render_with_base_and_layout "hello.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
@@ -32,7 +32,7 @@ describe "Views" do
   it "renders layout" do
     kemal = Kemal::RouteHandler::INSTANCE
     kemal.add_route "GET", "/view/:name" do |env|
-      name = env.params["name"]
+      name = env.params.url["name"]
       render "spec/asset/hello.ecr", "spec/asset/layout.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")

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