Plan CreateList

runtime/src/main/java/dev/cel/runtime/planner/BUILD.bazel

@@ -16,6 +16,7 @@ java_library(
         ":attribute",
         ":eval_attribute",
         ":eval_const",
+        ":eval_create_list",
         ":planned_program",
         "//:auto_value",
         "//common:cel_ast",
@@ -90,3 +91,16 @@ java_library(
         "@maven//:com_google_guava_guava",
     ],
 )
+
+java_library(
+    name = "eval_create_list",
+    srcs = ["EvalCreateList.java"],
+    deps = [
+        "//runtime",
+        "//runtime:evaluation_listener",
+        "//runtime:function_resolver",
+        "//runtime:interpretable",
+        "@maven//:com_google_errorprone_error_prone_annotations",
+        "@maven//:com_google_guava_guava",
+    ],
+)

runtime/src/main/java/dev/cel/runtime/planner/EvalCreateList.java

@@ -0,0 +1,67 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dev.cel.runtime.planner;
+
+import com.google.common.collect.ImmutableList;
+import com.google.errorprone.annotations.Immutable;
+import dev.cel.runtime.CelEvaluationException;
+import dev.cel.runtime.CelEvaluationListener;
+import dev.cel.runtime.CelFunctionResolver;
+import dev.cel.runtime.GlobalResolver;
+import dev.cel.runtime.Interpretable;
+
+@Immutable
+final class EvalCreateList implements Interpretable {
+
+  // Array contents are not mutated
+  @SuppressWarnings("Immutable")
+  private final Interpretable[] values;
+
+  @Override
+  public Object eval(GlobalResolver resolver) throws CelEvaluationException {
+    ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(values.length);
+    for (Interpretable value : values) {
+      builder.add(value.eval(resolver));
+    }
+    return builder.build();
+  }
+
+  @Override
+  public Object eval(GlobalResolver resolver, CelEvaluationListener listener) {
+    // TODO: Implement support
+    throw new UnsupportedOperationException("Not yet supported");
+  }
+
+  @Override
+  public Object eval(GlobalResolver resolver, CelFunctionResolver lateBoundFunctionResolver) {
+    // TODO: Implement support
+    throw new UnsupportedOperationException("Not yet supported");
+  }
+
+  @Override
+  public Object eval(GlobalResolver resolver, CelFunctionResolver lateBoundFunctionResolver,
+      CelEvaluationListener listener) {
+    // TODO: Implement support
+    throw new UnsupportedOperationException("Not yet supported");
+  }
+
+  static EvalCreateList create(Interpretable[] values) {
+    return new EvalCreateList(values);
+  }
+
+  private EvalCreateList(Interpretable[] values) {
+    this.values = values;
+  }
+}

runtime/src/main/java/dev/cel/runtime/planner/ProgramPlanner.java

@@ -15,13 +15,15 @@
 package dev.cel.runtime.planner;
 
 import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import javax.annotation.concurrent.ThreadSafe;
 import dev.cel.common.CelAbstractSyntaxTree;
 import dev.cel.common.CelContainer;
 import dev.cel.common.annotations.Internal;
 import dev.cel.common.ast.CelConstant;
 import dev.cel.common.ast.CelExpr;
+import dev.cel.common.ast.CelExpr.CelList;
 import dev.cel.common.ast.CelReference;
 import dev.cel.common.types.CelKind;
 import dev.cel.common.types.CelType;
@@ -65,6 +67,8 @@ private Interpretable plan(CelExpr celExpr, PlannerContext ctx) {
         return planConstant(celExpr.constant());
       case IDENT:
         return planIdent(celExpr, ctx);
+      case LIST:
+        return planCreateList(celExpr, ctx);
       case NOT_SET:
         throw new UnsupportedOperationException("Unsupported kind: " + celExpr.getKind());
       default:
@@ -124,6 +128,19 @@ private Interpretable planCheckedIdent(
     return EvalAttribute.create(attributeFactory.newAbsoluteAttribute(identRef.name()));
   }
 
+  private Interpretable planCreateList(CelExpr celExpr, PlannerContext ctx) {
+    CelList list = celExpr.list();
+
+    ImmutableList<CelExpr> elements = list.elements();
+    Interpretable[] values = new Interpretable[elements.size()];
+
+    for (int i = 0; i < elements.size(); i++) {
+      values[i] = plan(elements.get(i), ctx);
+    }
+
+    return EvalCreateList.create(values);
+  }
+
   @AutoValue
   abstract static class PlannerContext {
 

runtime/src/test/java/dev/cel/runtime/planner/ProgramPlannerTest.java

@@ -18,6 +18,7 @@
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertThrows;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.primitives.UnsignedLong;
@@ -88,7 +89,7 @@ public void plan_constant(@TestParameter ConstantTestCase testCase) throws Excep
   }
 
   @Test
-  public void planIdent_enum() throws Exception {
+  public void plan_ident_enum() throws Exception {
     if (isParseOnly) {
       // TODO Skip for now, requires attribute qualification
       return;
@@ -103,7 +104,7 @@ public void planIdent_enum() throws Exception {
   }
 
   @Test
-  public void planIdent_variable() throws Exception {
+  public void plan_ident_variable() throws Exception {
     CelAbstractSyntaxTree ast = compile("int_var");
     Program program = PLANNER.plan(ast);
 
@@ -112,6 +113,17 @@ public void planIdent_variable() throws Exception {
     assertThat(result).isEqualTo(1);
   }
 
+  @Test
+  @SuppressWarnings("unchecked") // test only
+  public void plan_createList() throws Exception {
+    CelAbstractSyntaxTree ast = compile("[1, 'foo', true, [2, false]]");
+    Program program = PLANNER.plan(ast);
+
+    ImmutableList<Object> result = (ImmutableList<Object>) program.eval();
+
+    assertThat(result).containsExactly(1L, "foo", true, ImmutableList.of(2L, false)).inOrder();
+  }
+
   @Test
   public void planIdent_typeLiteral(@TestParameter TypeLiteralTestCase testCase) throws Exception {
     if (isParseOnly) {