[Core] Extract Gherkin compatibility layer

core/pom.xml

@@ -1,4 +1,5 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
@@ -21,9 +22,24 @@
     </properties>
 
     <dependencies>
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>cucumber-gherkin</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>cucumber-gherkin-vintage</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>io.cucumber</groupId>
             <artifactId>gherkin</artifactId>
+            <version>${gherkin-vintage.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>gherkin-jvm-deps</artifactId>
+            <version>1.0.6</version>
         </dependency>
         <dependency>
             <groupId>io.cucumber</groupId>
@@ -125,6 +141,35 @@
                     </archive>
                 </configuration>
             </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.1.0</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <artifactSet>
+                                <includes>
+                                    <include>io.cucumber:gherkin</include>
+                                    <include>io.cucumber:gherkin-jvm-deps</include>
+                                </includes>
+                            </artifactSet>
+                            <relocations>
+                                <relocation>
+                                    <pattern>gherkin</pattern>
+                                    <shadedPattern>io.cucumber.core.internal.gherkin</shadedPattern>
+                                </relocation>
+                            </relocations>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
         </plugins>
     </build>
 

core/src/main/java/io/cucumber/core/eventbus/EventBus.java

@@ -1,6 +1,7 @@
 package io.cucumber.core.eventbus;
 
 import java.time.Instant;
+import java.util.UUID;
 
 import io.cucumber.plugin.event.Event;
 import io.cucumber.plugin.event.EventPublisher;
@@ -9,6 +10,8 @@ public interface EventBus extends EventPublisher {
 
     Instant getInstant();
 
+    UUID generateId();
+
     void send(Event event);
 
     void sendAll(Iterable<Event> queue);