Add tokens to SequencePattern interface

Author: andreaguarino

python-frontend/src/main/java/org/sonar/plugins/python/api/tree/SequencePattern.java

@@ -20,6 +20,7 @@
 package org.sonar.plugins.python.api.tree;
 
 import java.util.List;
+import javax.annotation.CheckForNull;
 
 /**
  * Sequence Pattern
@@ -37,5 +38,13 @@
  */
 public interface SequencePattern extends Pattern {
 
+  @CheckForNull
+  Token lDelimiter();
+
   List<Pattern> elements();
+
+  List<Token> commas();
+
+  @CheckForNull
+  Token rDelimiter();
 }

python-frontend/src/main/java/org/sonar/python/tree/SequencePatternImpl.java

@@ -21,6 +21,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import javax.annotation.CheckForNull;
 import javax.annotation.Nullable;
 import org.sonar.plugins.python.api.tree.Pattern;
 import org.sonar.plugins.python.api.tree.SequencePattern;
@@ -44,11 +45,28 @@ public SequencePatternImpl(@Nullable Token leftDelimiter, List<Pattern> elements
     this.rightDelimiter = rightDelimiter;
   }
 
+  @CheckForNull
+  @Override
+  public Token lDelimiter() {
+    return leftDelimiter;
+  }
+
   @Override
   public List<Pattern> elements() {
     return elements;
   }
 
+  @Override
+  public List<Token> commas() {
+    return commas;
+  }
+
+  @CheckForNull
+  @Override
+  public Token rDelimiter() {
+    return rightDelimiter;
+  }
+
   @Override
   public void accept(TreeVisitor visitor) {
     visitor.visitSequencePattern(this);

python-frontend/src/test/java/org/sonar/python/tree/PythonTreeMakerMatchStatementTest.java

@@ -247,6 +247,22 @@ public void sequence_pattern() {
     assertSequenceElements(pattern("case ['foo' as head]: ..."), Kind.AS_PATTERN);
   }
 
+  @Test
+  public void sequence_pattern_delimiters() {
+    SequencePattern pattern = pattern("case [x, y]: ...");
+    assertThat(pattern.lDelimiter().value()).isEqualTo("[");
+    assertThat(pattern.rDelimiter().value()).isEqualTo("]");
+    assertThat(pattern.commas()).hasSize(1);
+
+    pattern = pattern("case (x, y): ...");
+    assertThat(pattern.lDelimiter().value()).isEqualTo("(");
+    assertThat(pattern.rDelimiter().value()).isEqualTo(")");
+
+    pattern = pattern("case x, y: ...");
+    assertThat(pattern.lDelimiter()).isNull();
+    assertThat(pattern.rDelimiter()).isNull();
+  }
+
   @Test
   public void group_pattern() {
     GroupPattern groupPattern = pattern("case (x): ...");