cel.dev/expr v0.24.0: Constant, Expr, ParsedExpr

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/cel.dev/expr@v0.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/cel.dev/expr@v0.24.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

package sample_test

import (
	"testing"

	expr "cel.dev/expr"
	"google.golang.org/protobuf/proto"
)

func TestConstantConstruction(t *testing.T) {
	// 1. Construct constant values of different types
	boolConst := &expr.Constant{
		ConstantKind: &expr.Constant_BoolValue{BoolValue: true},
	}
	if !boolConst.GetBoolValue() {
		t.Fatal("expected GetBoolValue() to be true")
	}

	intConst := &expr.Constant{
		ConstantKind: &expr.Constant_Int64Value{Int64Value: 42},
	}
	if intConst.GetInt64Value() != 42 {
		t.Fatalf("expected GetInt64Value() == 42, got %d", intConst.GetInt64Value())
	}

	strConst := &expr.Constant{
		ConstantKind: &expr.Constant_StringValue{StringValue: "hello cel"},
	}
	if strConst.GetStringValue() != "hello cel" {
		t.Fatalf("expected GetStringValue() == 'hello cel', got %s", strConst.GetStringValue())
	}
}

func TestExprAstConstruction(t *testing.T) {
	// 2. Build an AST expression node: id == 1
	lhs := &expr.Expr{
		Id: 1,
		ExprKind: &expr.Expr_IdentExpr{
			IdentExpr: &expr.Expr_Ident{
				Name: "x",
			},
		},
	}
	rhs := &expr.Expr{
		Id: 2,
		ExprKind: &expr.Expr_ConstExpr{
			ConstExpr: &expr.Constant{
				ConstantKind: &expr.Constant_Int64Value{Int64Value: 100},
			},
		},
	}
	root := &expr.Expr{
		Id: 3,
		ExprKind: &expr.Expr_CallExpr{
			CallExpr: &expr.Expr_Call{
				Function: "_==_",
				Args:     []*expr.Expr{lhs, rhs},
			},
		},
	}

	call := root.GetCallExpr()
	if call == nil {
		t.Fatal("expected GetCallExpr() to return non-nil")
	}
	if call.GetFunction() != "_==_" {
		t.Fatalf("expected function '_==_', got %s", call.GetFunction())
	}
	if len(call.GetArgs()) != 2 {
		t.Fatalf("expected 2 args, got %d", len(call.GetArgs()))
	}
	if call.GetArgs()[0].GetIdentExpr().GetName() != "x" {
		t.Fatalf("expected arg[0] ident 'x', got %s", call.GetArgs()[0].GetIdentExpr().GetName())
	}
	if call.GetArgs()[1].GetConstExpr().GetInt64Value() != 100 {
		t.Fatalf("expected arg[1] const 100, got %d", call.GetArgs()[1].GetConstExpr().GetInt64Value())
	}
}

func TestParsedExprSerialization(t *testing.T) {
	// 3. Construct ParsedExpr and serialize/deserialize via protobuf
	parsed := &expr.ParsedExpr{
		Expr: &expr.Expr{
			Id: 1,
			ExprKind: &expr.Expr_ConstExpr{
				ConstExpr: &expr.Constant{
					ConstantKind: &expr.Constant_StringValue{StringValue: "sample"},
				},
			},
		},
		SourceInfo: &expr.SourceInfo{
			Location:    "sample.cel",
			LineOffsets: []int32{0, 10, 25},
			Positions: map[int64]int32{
				1: 0,
			},
		},
	}

	data, err := proto.Marshal(parsed)
	if err != nil {
		t.Fatalf("proto.Marshal failed: %v", err)
	}

	var unmarshaled expr.ParsedExpr
	if err := proto.Unmarshal(data, &unmarshaled); err != nil {
		t.Fatalf("proto.Unmarshal failed: %v", err)
	}

	if unmarshaled.GetSourceInfo().GetLocation() != "sample.cel" {
		t.Fatalf("expected location 'sample.cel', got %s", unmarshaled.GetSourceInfo().GetLocation())
	}
	if unmarshaled.GetExpr().GetConstExpr().GetStringValue() != "sample" {
		t.Fatalf("expected const value 'sample', got %s", unmarshaled.GetExpr().GetConstExpr().GetStringValue())
	}
}

func TestTypeConstruction(t *testing.T) {
	// 4. Construct primitive and composite Type definitions
	primitiveType := &expr.Type{
		TypeKind: &expr.Type_Primitive{
			Primitive: expr.Type_INT64,
		},
	}
	if primitiveType.GetPrimitive() != expr.Type_INT64 {
		t.Fatalf("expected Primitive INT64, got %v", primitiveType.GetPrimitive())
	}

	listType := &expr.Type{
		TypeKind: &expr.Type_ListType_{
			ListType: &expr.Type_ListType{
				ElemType: primitiveType,
			},
		},
	}
	if listType.GetListType() == nil || listType.GetListType().GetElemType().GetPrimitive() != expr.Type_INT64 {
		t.Fatal("expected ListType with INT64 element type")
	}

	mapType := &expr.Type{
		TypeKind: &expr.Type_MapType_{
			MapType: &expr.Type_MapType{
				KeyType: &expr.Type{
					TypeKind: &expr.Type_Primitive{
						Primitive: expr.Type_STRING,
					},
				},
				ValueType: primitiveType,
			},
		},
	}
	if mapType.GetMapType() == nil || mapType.GetMapType().GetKeyType().GetPrimitive() != expr.Type_STRING {
		t.Fatal("expected MapType with STRING key type")
	}
}

func TestCheckedExprConstruction(t *testing.T) {
	// 5. Construct CheckedExpr with TypeMap and ReferenceMap
	checked := &expr.CheckedExpr{
		Expr: &expr.Expr{
			Id: 1,
			ExprKind: &expr.Expr_IdentExpr{
				IdentExpr: &expr.Expr_Ident{Name: "authenticated"},
			},
		},
		TypeMap: map[int64]*expr.Type{
			1: {
				TypeKind: &expr.Type_Primitive{
					Primitive: expr.Type_BOOL,
				},
			},
		},
		ReferenceMap: map[int64]*expr.Reference{
			1: {
				Name: "authenticated",
			},
		},
		SourceInfo: &expr.SourceInfo{
			Location: "auth_rule.cel",
		},
	}

	if checked.GetTypeMap()[1].GetPrimitive() != expr.Type_BOOL {
		t.Fatalf("expected TypeMap[1] to be BOOL, got %v", checked.GetTypeMap()[1].GetPrimitive())
	}
	if checked.GetReferenceMap()[1].GetName() != "authenticated" {
		t.Fatalf("expected ReferenceMap[1] name 'authenticated', got %s", checked.GetReferenceMap()[1].GetName())
	}
}

{"case":{"caseId":"case:sha256:43102c3e399776b929c0e08e01a9642e9e2d61cf21fb8d9e0b1f3f2e23394add","contract":["expr.Constant represents typed constant values such as bool, int64, and string","expr.Expr constructs abstract syntax tree nodes for expressions including ident and call","expr.ParsedExpr holds parsed expression AST and source info serializable via protobuf","expr.Type defines primitive, list, and map type specifications","expr.CheckedExpr associates AST nodes with resolved types and reference maps"],"goal":"verify pkg:golang/cel.dev/expr@v0.24.0","kind":"HOW","packages":["pkg:golang/cel.dev/expr@v0.24.0"],"schemaVersion":1,"symbols":["cel.dev/expr.Constant","cel.dev/expr.Expr","cel.dev/expr.ParsedExpr","cel.dev/expr.Type","cel.dev/expr.CheckedExpr"]},"contractCommand":["go","test","-v","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/cel.dev/expr@v0.24.0"],"schemaVersion":1,"subject":"pkg:golang/cel.dev/expr@v0.24.0","symbols":["cel.dev/expr.Constant","cel.dev/expr.Expr","cel.dev/expr.ParsedExpr","cel.dev/expr.Type","cel.dev/expr.CheckedExpr"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	cel.dev/expr v0.24.0
	google.golang.org/protobuf v1.34.2
)

cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
cel.dev/expr v0.24.0/go.mod h1:hLPLo1W4QUmuYdA72RBX06QTs6MXw941piREPl3Yfiw=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/cel.dev/expr@v0.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/cel.dev/expr@v0.24.0"
  ]
}