diff --git a/spec/config_spec.cr b/spec/config_spec.cr
new file mode 100644
index 0000000..27e36d4
--- /dev/null
+++ b/spec/config_spec.cr
@@ -0,0 +1,10 @@
+require "./spec_helper"
+
+describe TextToSqlSearch do
+  it "can create config" do
+		t= TextToSqlSearch::Base.new
+		c = t.config
+		c.class.should eq TextToSqlSearch::Config
+		c.operators_allowed.should eq ["<", ">", "=", ":"]
+  end
+end
diff --git a/spec/methods_spec.cr b/spec/methods_spec.cr
new file mode 100644
index 0000000..d582817
--- /dev/null
+++ b/spec/methods_spec.cr
@@ -0,0 +1,15 @@
+require "./spec_helper"
+
+describe TextToSqlSearch do
+  it "can create config" do
+		t= TextToSqlSearch::Base.new
+		c = t.config
+
+		tokens= %w(at stage = 7th leg of long ! dreary road)
+
+		t.peek_next(tokens, 0).should eq :todo
+		t.peek_next(tokens, 1).should eq :operator
+		t.peek_next(tokens, 6).should eq :negation
+		t.peek_next(tokens, 6, ["!"]).should eq :todo
+  end
+end
diff --git a/spec/text_to_sql_search_spec.cr b/spec/text_to_sql_search_spec.cr
index bb213da..960d523 100644
--- a/spec/text_to_sql_search_spec.cr
+++ b/spec/text_to_sql_search_spec.cr
@@ -1,9 +1,6 @@
 require "./spec_helper"
 
 describe TextToSqlSearch do
-  # TODO: Write tests
-
   it "works" do
-    false.should eq(true)
   end
 end
diff --git a/src/text_to_sql_search.cr b/src/text_to_sql_search.cr
index cb919fa..c37dd24 100644
--- a/src/text_to_sql_search.cr
+++ b/src/text_to_sql_search.cr
@@ -1,4 +1,37 @@
+require "yaml"
 require "./text_to_sql_search/**"
 
 module TextToSqlSearch
+	class Config
+		@operators_allowed = ["<", ">", "=", ":"]
+		@negation_words    = ["!", "no", "not"]
+		@ignored_words     = ["with", "than"]
+		
+		def initialize; end
+		
+		YAML.mapping(
+			operators_allowed:   {type: Array(String)},
+			negation_words:      {type: Array(String)},
+			ignored_words:       {type: Array(String)},
+		)
+	end
+
+	class Base
+		# Instantiates new, default config. Returns existing config on subsequent calls.
+		def config
+			@config||= Config.new
+		end
+		
+		# Given list and current position, peeks into upcoming elements to determine their type.
+		# All decision-making is done based on current config.
+		def peek_next( list, i, ignored= config.ignored_words)
+			while el= list[i+=1]?
+				next if ignored.includes? el
+				return :operator if config.operators_allowed.includes? el
+				return :negation if config.negation_words.includes? el
+				return :todo
+			end
+		end
+
+	end
 end