diff --git a/.gitignore b/.gitignore
index a7baab0..6c54f97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 # Project exclude paths
 /.gradle/
 /build/
+/.idea/sonarlint/issuestore/
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index ba1ec5c..611e7c8 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/build.gradle b/build.gradle
index 5147f68..be4be2a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,16 +1,23 @@
 plugins {
     id 'java'
+    id 'antlr'
 }
 
 group 'de.churl'
 version '1.0-SNAPSHOT'
 sourceCompatibility = '14'
 
+generateGrammarSource {
+    outputDirectory = file("src/main/java/lexer")
+}
+
 repositories {
     mavenCentral()
 }
 
 dependencies {
+    antlr "org.antlr:antlr4:4.8"
+
     testImplementation("org.assertj:assertj-core:3.18.1")
     testImplementation(platform('org.junit:junit-bom:5.7.0'))
     testImplementation('org.junit.jupiter:junit-jupiter')