refactor: move Postal::QueryString to app/util/query_string

app/controllers/messages_controller.rb

@@ -161,7 +161,7 @@ def get_messages(scope)
 
       if @query = (params[:query] || session["msg_query_#{@server.id}_#{scope}"]).presence
         session["msg_query_#{@server.id}_#{scope}"] = @query
-        qs = Postal::QueryString.new(@query)
+        qs = QueryString.new(@query)
         if qs.empty?
           flash.now[:alert] = "It doesn't appear you entered anything to filter on. Please double check your query."
         else

app/util/query_string.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class QueryString
+
+  def initialize(string)
+    @string = string.strip + " "
+  end
+
+  def [](value)
+    hash[value.to_s]
+  end
+
+  delegate :empty?, to: :hash
+
+  def hash
+    @hash ||= @string.scan(/([a-z]+):\s*(?:(\d{2,4}-\d{2}-\d{2}\s\d{2}:\d{2})|"(.*?)"|(.*?))(\s|\z)/).each_with_object({}) do |(key, date, string_with_spaces, value), hash|
+      if date
+        actual_value = date
+      elsif string_with_spaces
+        actual_value = string_with_spaces
+      elsif value == "[blank]"
+        actual_value = nil
+      else
+        actual_value = value
+      end
+
+      if hash.keys.include?(key.to_s)
+        hash[key.to_s] = [hash[key.to_s]].flatten
+        hash[key.to_s] << actual_value
+      else
+        hash[key.to_s] = actual_value
+      end
+    end
+  end
+
+end

spec/util/query_string_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe QueryString do
+  it "works with a single item" do
+    qs = described_class.new("to: test@example.com")
+    expect(qs.hash["to"]).to eq "test@example.com"
+  end
+
+  it "works with a multiple items" do
+    qs = described_class.new("to: test@example.com from: another@example.com")
+    expect(qs.hash["to"]).to eq "test@example.com"
+    expect(qs.hash["from"]).to eq "another@example.com"
+  end
+
+  it "does not require a space after the field name" do
+    qs = described_class.new("to:test@example.com from:another@example.com")
+    expect(qs.hash["to"]).to eq "test@example.com"
+    expect(qs.hash["from"]).to eq "another@example.com"
+  end
+
+  it "returns nil when it receives blank" do
+    qs = described_class.new("to:[blank]")
+    expect(qs.hash["to"]).to eq nil
+  end
+
+  it "handles dates with spaces" do
+    qs = described_class.new("date: 2017-02-12 15:20")
+    expect(qs.hash["date"]).to eq("2017-02-12 15:20")
+  end
+
+  it "returns an array for multiple items" do
+    qs = described_class.new("to: test@example.com to: another@example.com")
+    expect(qs.hash["to"]).to be_a(Array)
+    expect(qs.hash["to"][0]).to eq "test@example.com"
+    expect(qs.hash["to"][1]).to eq "another@example.com"
+  end
+
+  it "works with a z in the string" do
+    qs = described_class.new("to: testaz@example.com")
+    expect(qs.hash["to"]).to eq "testaz@example.com"
+  end
+end