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cel_test.go
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// Copyright 2019 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
//
// http://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 cel
import (
"bytes"
"context"
"fmt"
"os"
"reflect"
"strings"
"sync"
"testing"
"time"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protodesc"
"google.golang.org/protobuf/reflect/protoreflect"
"github.com/google/cel-go/checker"
celast "github.com/google/cel-go/common/ast"
"github.com/google/cel-go/common/env"
"github.com/google/cel-go/common/operators"
"github.com/google/cel-go/common/overloads"
"github.com/google/cel-go/common/types"
"github.com/google/cel-go/common/types/ref"
"github.com/google/cel-go/common/types/traits"
"github.com/google/cel-go/interpreter"
"github.com/google/cel-go/parser"
"github.com/google/cel-go/test"
exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
descpb "google.golang.org/protobuf/types/descriptorpb"
dynamicpb "google.golang.org/protobuf/types/dynamicpb"
durationpb "google.golang.org/protobuf/types/known/durationpb"
timestamppb "google.golang.org/protobuf/types/known/timestamppb"
wrapperspb "google.golang.org/protobuf/types/known/wrapperspb"
proto2pb "github.com/google/cel-go/test/proto2pb"
proto3pb "github.com/google/cel-go/test/proto3pb"
)
func Test_ExampleWithBuiltins(t *testing.T) {
// Variables used within this expression environment.
env, err := NewEnv(
Variable("i", StringType),
Variable("you", StringType),
)
if err != nil {
t.Fatalf("environment creation error: %s\n", err)
}
// Compile the expression.
ast, iss := env.Compile(`"Hello " + you + "! I'm " + i + "."`)
if iss.Err() != nil {
t.Fatal(iss.Err())
}
// Create the program, and evaluate it against some input.
prg, err := env.Program(ast)
if err != nil {
t.Fatalf("program creation error: %s\n", err)
}
// If the Eval() call were provided with cel.EvalOptions(OptTrackState) the details response
// (2nd return) would be non-nil.
out, _, err := prg.Eval(
map[string]any{
"i": "CEL",
"you": "world",
},
)
if err != nil {
t.Fatalf("runtime error: %s\n", err)
}
// Hello world! I'm CEL.
if out.Equal(types.String("Hello world! I'm CEL.")) != types.True {
t.Errorf(`got '%v', wanted "Hello world! I'm CEL."`, out.Value())
}
}
func TestEval(t *testing.T) {
env, err := NewEnv(
Variable("input", ListType(IntType)),
CostEstimatorOptions(
checker.OverloadCostEstimate(overloads.TimestampToYear, estimateTimestampToYear),
),
)
if err != nil {
t.Fatalf("NewEnv() failed: %v", err)
}
tests := []struct {
expr string
in any
}{
{
expr: `input.size() != 0`,
in: map[string]any{"input": []int{1, 2, 3}},
},
}
for i, tst := range tests {
tc := tst
t.Run(fmt.Sprintf("[%d]", i), func(t *testing.T) {
ast, iss := env.Compile(tc.expr)
if iss.Err() != nil {
t.Fatalf("env.Compile(%s) failed: %v", tc.expr, iss.Err())
}
ctx := context.Background()
prgOpts := []ProgramOption{
CostTracking(testRuntimeCostEstimator{}),
CostTrackerOptions(
interpreter.OverloadCostTracker(overloads.TimestampToYear, trackTimestampToYear),
),
EvalOptions(OptOptimize, OptTrackCost),
InterruptCheckFrequency(100),
}
prg, err := env.Program(ast, prgOpts...)
if err != nil {
t.Fatalf("env.Program() failed: %v", err)
}
for k := 0; k < 100; k++ {
t.Run(fmt.Sprintf("[%d]", k), func(t *testing.T) {
t.Parallel()
prg.Eval(tc.in)
evalCtx, cancel := context.WithTimeout(ctx, time.Minute)
defer cancel()
_, _, err := prg.ContextEval(evalCtx, tc.in)
if err != nil {
t.Fatalf("prg.ContextEval() failed: %v", err)
}
})
}
})
}
}
func TestAbbrevsCompiled(t *testing.T) {
// Test whether abbreviations successfully resolve at type-check time (compile time).
env := testEnv(t,
Abbrevs("qualified.identifier.name"),
Variable("qualified.identifier.name.first", StringType),
)
prg := compile(t, env, `"hello "+ name.first`) // abbreviation resolved here.
out, _, err := prg.Eval(
map[string]any{
"qualified.identifier.name.first": "Jim",
},
)
if err != nil {
t.Fatal(err)
}
if out.Value() != "hello Jim" {
t.Errorf("got %v, wanted 'hello Jim'", out)
}
}
func TestAbbrevsParsed(t *testing.T) {
// Test whether abbreviations are resolved properly at evaluation time.
env := testEnv(t,
Abbrevs("qualified.identifier.name"),
)
ast, iss := env.Parse(`"hello " + name.first`)
if iss.Err() != nil {
t.Fatal(iss.Err())
}
prg, err := env.Program(ast) // abbreviation resolved here.
if err != nil {
t.Fatal(err)
}
out, _, err := prg.Eval(
map[string]any{
"qualified.identifier.name": map[string]string{
"first": "Jim",
},
},
)
if err != nil {
t.Fatal(err)
}
if out.Value() != "hello Jim" {
t.Errorf("got %v, wanted 'hello Jim'", out)
}
}
func TestAbbrevsDisambiguation(t *testing.T) {
env := testEnv(t,
Abbrevs("external.Expr"),
Container("google.api.expr.v1alpha1"),
Types(&exprpb.Expr{}),
Variable("test", BoolType),
Variable("external.Expr", StringType),
)
// This expression will return either a string or a protobuf Expr value depending on the value
// of the 'test' argument. The fully qualified type name is used indicate that the protobuf
// typed 'Expr' should be used rather than the abbreviatation for 'external.Expr'.
out, err := interpret(t, env, `test ? dyn(Expr) : google.api.expr.v1alpha1.Expr{id: 1}`,
map[string]any{
"test": true,
"external.Expr": "string expr",
},
)
if err != nil {
t.Fatal(err)
}
if out.Value() != "string expr" {
t.Errorf("got %v, wanted 'string expr'", out)
}
out, err = interpret(t, env, `test ? dyn(Expr) : google.api.expr.v1alpha1.Expr{id: 1}`,
map[string]any{
"test": false,
"external.Expr": "wrong expr",
},
)
if err != nil {
t.Fatal(err)
}
want := &exprpb.Expr{Id: 1}
got, err := out.ConvertToNative(reflect.TypeOf(want))
if err != nil {
t.Fatal(err)
}
if !proto.Equal(got.(*exprpb.Expr), want) {
t.Errorf("got %v, wanted '%v'", out, want)
}
}
func TestCustomEnvError(t *testing.T) {
env, err := NewCustomEnv(StdLib(), StdLib())
if err != nil {
t.Fatalf("NewCustomEnv() failed: %v", err)
}
_, iss := compileOrError(t, env, "a.b.c == true")
if iss == nil {
t.Error("got successful compile, expected error for duplicate function declarations.")
}
}
func TestCustomEnv(t *testing.T) {
env, err := NewCustomEnv(Variable("a.b.c", BoolType))
if err != nil {
t.Fatalf("NewCustomEnv(a.b.c:bool) failed: %v", err)
}
t.Run("err", func(t *testing.T) {
_, iss := compileOrError(t, env, "a.b.c == true")
if iss == nil {
t.Error("got successful compile, expected error for missing operator '_==_'")
}
})
t.Run("ok", func(t *testing.T) {
out, err := interpret(t, env, "a.b.c", map[string]any{"a.b.c": true})
if err != nil {
t.Fatal(err)
}
if out != types.True {
t.Errorf("got '%v', wanted 'true'", out.Value())
}
})
}
func TestCrossTypeNumericComparisons(t *testing.T) {
tests := []struct {
name string
expr string
iss string
opt EnvOption
out ref.Val
}{
// Statically typed expressions need to opt in to cross-type numeric comparisons
{
name: "double_less_than_int_err",
expr: `1.0 < 2`,
opt: CrossTypeNumericComparisons(false),
iss: `
ERROR: <input>:1:5: found no matching overload for '_<_' applied to '(double, int)'
| 1.0 < 2
| ....^`,
},
{
name: "double_less_than_int_success",
expr: `1.0 < 2`,
opt: CrossTypeNumericComparisons(true),
out: types.True,
},
// Dynamic data already benefits from cross-type numeric comparisons
{
name: "dyn_less_than_int_success",
expr: `dyn(1.0) < 2`,
opt: CrossTypeNumericComparisons(false),
out: types.True,
},
{
name: "dyn_less_than_int_success",
expr: `dyn(1.0) < 2`,
opt: CrossTypeNumericComparisons(true),
out: types.True,
},
}
for _, tst := range tests {
tc := tst
t.Run(tc.name, func(t *testing.T) {
e := testEnv(t, tc.opt)
ast, iss := e.Compile(tc.expr)
if tc.iss != "" {
if iss.Err() == nil {
t.Fatalf("e.Compile(%v) returned ast, expected error: %v", tc.expr, tc.iss)
}
if !test.Compare(iss.Err().Error(), tc.iss) {
t.Fatalf("e.Compile(%v) returned %v, expected error: %v", tc.expr, iss.Err(), tc.iss)
}
return
}
if iss.Err() != nil {
t.Fatalf("e.Compile(%v) failed: %v", tc.expr, iss.Err())
}
prg, err := e.Program(ast)
if err != nil {
t.Fatalf("e.Program() failed: %v", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatalf("prg.Eval() errored: %v", err)
}
if out != tc.out {
t.Errorf("program eval got %v, wanted %v", out, tc.out)
}
})
}
}
func TestExtendStdlibFunction(t *testing.T) {
env := testEnv(t,
Function(overloads.Contains,
MemberOverload("bytes_contains_bytes", []*Type{BytesType, BytesType}, BoolType,
BinaryBinding(func(bstr, bsub ref.Val) ref.Val {
return types.Bool(bytes.Contains([]byte(bstr.(types.Bytes)), []byte(bsub.(types.Bytes))))
}))),
)
prg := compile(t, env, `b'string'.contains(b'tri') && 'string'.contains('tri')`)
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatalf("contains check errored: %v", err)
}
if out != types.True {
t.Errorf("contains check got %v, wanted true", out)
}
}
func TestSubsetStdLib(t *testing.T) {
env, err := NewCustomEnv(
StdLib(StdLibSubset(
&env.LibrarySubset{
IncludeMacros: []string{"has"},
IncludeFunctions: []*env.Function{
{Name: operators.Equals},
{Name: operators.NotEquals},
{Name: operators.LogicalAnd},
{Name: operators.LogicalOr},
{Name: operators.LogicalNot},
{Name: overloads.Size, Overloads: []*env.Overload{{ID: "list_size"}}},
},
},
)))
if err != nil {
t.Fatalf("StdLib() subsetting failed: %v", err)
}
tests := []struct {
name string
expr string
compiles bool
want ref.Val
}{
{
name: "has macro",
expr: "!has({}.a)",
compiles: true,
want: types.True,
},
{
name: "not equals",
expr: "has({}.a) != true",
compiles: true,
want: types.True,
},
{
name: "logical operators",
expr: "has({}.a) != true && has({'b': 1}.b) == true",
compiles: true,
want: types.True,
},
{
name: "list size - allowed",
expr: "[1, 2, 3].size()",
compiles: true,
want: types.Int(3),
},
{
name: "excluded macro",
expr: "[1, 2, 3].exists(i, i != 0)",
compiles: false,
},
{
name: "string size - not allowed",
expr: "'hello'.size()",
compiles: false,
},
}
for _, tst := range tests {
tc := tst
t.Run(tc.name, func(t *testing.T) {
ast, iss := env.Compile(tc.expr)
if tc.compiles && iss.Err() != nil {
t.Fatalf("env.Compile(%q) failed: %v", tc.expr, iss.Err())
}
if !tc.compiles && iss.Err() != nil {
return
}
prg, err := env.Program(ast)
if err != nil {
t.Fatalf("env.Program() failed: %v", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatalf("prg.Eval() failed: %s", err)
}
if out.Equal(tc.want) != types.True {
t.Errorf("prg.Eval() got %v, wanted %v", out, tc.want)
}
})
}
}
func TestSubsetStdLibError(t *testing.T) {
_, err := NewCustomEnv(
StdLib(StdLibSubset(
env.NewLibrarySubset().AddIncludedMacros("has").AddExcludedMacros("exists")),
))
if err == nil || !strings.Contains(err.Error(), "invalid subset") {
t.Errorf("StdLib() subsetting got %v, wanted error 'invalid subset'", err)
}
}
func TestSubsetStdLibMerge(t *testing.T) {
_, err := NewCustomEnv(
Function("size", MemberOverload("string_size", []*Type{StringType}, IntType)),
StdLib(StdLibSubset(
env.NewLibrarySubset().AddIncludedFunctions([]*env.Function{
{Name: overloads.Size, Overloads: []*env.Overload{{ID: "string_size"}}},
}...),
)))
if err != nil {
t.Errorf("StdLib() subsetting failed to merge: %v", err)
}
}
func TestSubsetStdLibMergeError(t *testing.T) {
_, err := NewCustomEnv(
Function("size", MemberOverload("string_size", []*Type{StringType}, UintType)),
StdLib(StdLibSubset(
env.NewLibrarySubset().AddIncludedFunctions([]*env.Function{
{Name: overloads.Size, Overloads: []*env.Overload{{ID: "string_size"}}},
}...),
)))
if err == nil || !strings.Contains(err.Error(), "merge failed") {
t.Errorf("StdLib() subsetting got %v, wanted error 'merge failed'", err)
}
}
func TestCustomTypes(t *testing.T) {
reg := types.NewEmptyRegistry()
env := testEnv(t,
CustomTypeAdapter(reg),
CustomTypeProvider(reg),
Container("google.api.expr.v1alpha1"),
Types(
&exprpb.Expr{},
types.BoolType,
types.IntType,
types.StringType),
Variable("expr", ObjectType("google.api.expr.v1alpha1.Expr")),
)
ast, iss := env.Compile(`
expr == Expr{id: 2,
call_expr: Expr.Call{
function: "_==_",
args: [
Expr{id: 1, ident_expr: Expr.Ident{ name: "a" }},
Expr{id: 3, ident_expr: Expr.Ident{ name: "b" }}]
}}`)
if iss.Err() != nil {
t.Fatalf("Compile() failed: %v", iss.Err())
}
if ast.OutputType() != BoolType {
t.Fatalf("got %v, wanted type bool", ast.OutputType())
}
prg, _ := env.Program(ast)
vars := map[string]any{"expr": &exprpb.Expr{
Id: 2,
ExprKind: &exprpb.Expr_CallExpr{
CallExpr: &exprpb.Expr_Call{
Function: "_==_",
Args: []*exprpb.Expr{
{
Id: 1,
ExprKind: &exprpb.Expr_IdentExpr{
IdentExpr: &exprpb.Expr_Ident{Name: "a"},
},
},
{
Id: 3,
ExprKind: &exprpb.Expr_IdentExpr{
IdentExpr: &exprpb.Expr_Ident{Name: "b"},
},
},
},
},
},
}}
out, _, _ := prg.Eval(vars)
if out != types.True {
t.Errorf("got '%v', wanted 'true'", out.Value())
}
}
func TestTypeIsolation(t *testing.T) {
b, err := os.ReadFile("testdata/team.fds")
if err != nil {
t.Fatal("can't read fds file: ", err)
}
var fds descpb.FileDescriptorSet
if err = proto.Unmarshal(b, &fds); err != nil {
t.Fatal("can't unmarshal descriptor data: ", err)
}
env := testEnv(t,
TypeDescs(&fds),
Variable("myteam", ObjectType("cel.testdata.Team")),
)
src := "myteam.members[0].name == 'Cyclops'"
compile(t, env, src)
// Ensure that isolated types don't leak through.
e2 := testEnv(t, Variable("myteam", ObjectType("cel.testdata.Team")))
_, iss := compileOrError(t, e2, src)
if iss == nil {
t.Errorf("wanted compile failure for unknown message.")
}
}
func TestDynamicProto(t *testing.T) {
b, err := os.ReadFile("testdata/team.fds")
if err != nil {
t.Fatalf("os.ReadFile() failed: %v", err)
}
var fds descpb.FileDescriptorSet
if err = proto.Unmarshal(b, &fds); err != nil {
t.Fatalf("proto.Unmarshal() failed: %v", err)
}
files := (&fds).GetFile()
fileCopy := make([]any, len(files))
for i := 0; i < len(files); i++ {
fileCopy[i] = files[i]
}
pbFiles, err := protodesc.NewFiles(&fds)
if err != nil {
t.Fatalf("protodesc.NewFiles() failed: %v", err)
}
e := testEnv(t,
Container("cel"),
// The following is identical to registering the FileDescriptorSet;
// however, it tests a different code path which aggregates individual
// FileDescriptorProto values together.
TypeDescs(fileCopy...),
// Additionally, demonstrate that double registration of files doesn't
// cause any problems.
TypeDescs(pbFiles),
)
src := `testdata.Team{name: 'X-Men', members: [
testdata.Mutant{name: 'Jean Grey', level: 20},
testdata.Mutant{name: 'Cyclops', level: 7},
testdata.Mutant{name: 'Storm', level: 7},
testdata.Mutant{name: 'Wolverine', level: 11}
]}`
ast, iss := e.Compile(src)
if iss.Err() != nil {
t.Fatalf("env.Compile(%s) failed: %v", src, iss.Err())
}
prg, err := e.Program(ast, EvalOptions(OptOptimize))
if err != nil {
t.Fatalf("env.Program() failed: %v", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatalf("program.Eval() failed: %v", err)
}
obj, ok := out.(traits.Indexer)
if !ok {
t.Fatalf("unable to convert output to object: %v", out)
}
if obj.Get(types.String("name")).Equal(types.String("X-Men")) == types.False {
t.Fatalf("got field 'name' %v, wanted X-Men", obj.Get(types.String("name")))
}
}
func TestDynamicProtoFileDescriptors(t *testing.T) {
b, err := os.ReadFile("testdata/team.fds")
if err != nil {
t.Fatalf("os.ReadFile() failed: %v", err)
}
var fds descpb.FileDescriptorSet
if err = proto.Unmarshal(b, &fds); err != nil {
t.Fatalf("proto.Unmarshal() failed: %v", err)
}
files := (&fds).GetFile()
fileCopy := make([]any, len(files))
for i := 0; i < len(files); i++ {
fileCopy[i] = files[i]
}
pbFiles, err := protodesc.NewFiles(&fds)
if err != nil {
t.Fatalf("protodesc.NewFiles() failed: %v", err)
}
desc, err := pbFiles.FindDescriptorByName("cel.testdata.Mutant")
if err != nil {
t.Fatalf("pbFiles.FindDescriptorByName() could not find Mutant: %v", err)
}
msgDesc, ok := desc.(protoreflect.MessageDescriptor)
if !ok {
t.Fatalf("desc not convertible to MessageDescriptor: %T", desc)
}
wolverine := dynamicpb.NewMessage(msgDesc)
wolverine.ProtoReflect().Set(msgDesc.Fields().ByName("name"), protoreflect.ValueOfString("Wolverine"))
env := testEnv(t,
// The following is identical to registering the FileDescriptorSet;
// however, it tests a different code path which aggregates individual
// FileDescriptorProto values together.
TypeDescs(fileCopy...),
Variable("mutant", ObjectType("cel.testdata.Mutant")),
)
src := `has(mutant.name) && mutant.name == 'Wolverine'`
ast, iss := env.Compile(src)
if iss.Err() != nil {
t.Fatalf("env.Compile(%s) failed: %v", src, iss.Err())
}
prg, err := env.Program(ast, EvalOptions(OptOptimize))
if err != nil {
t.Fatalf("env.Program() failed: %v", err)
}
out, _, err := prg.Eval(map[string]any{
"mutant": wolverine,
})
if err != nil {
t.Fatalf("program.Eval() failed: %v", err)
}
obj, ok := out.(types.Bool)
if !ok {
t.Fatalf("unable to convert output to object: %v", out)
}
if obj != types.True {
t.Errorf("got %v, wanted true", out)
}
}
func TestGlobalVars(t *testing.T) {
env := testEnv(t,
Variable("attrs", MapType(StringType, DynType)),
Variable("default", DynType),
Function("get",
MemberOverload("get_map", []*Type{MapType(StringType, DynType), StringType, DynType}, DynType,
FunctionBinding(func(args ...ref.Val) ref.Val {
attrs, ok := args[0].(traits.Mapper)
if !ok {
return types.NewErr(
"invalid operand of type '%v' to obj.get(key, def)",
args[0].Type())
}
key := args[1]
defVal := args[2]
if attrs.Contains(key) == types.True {
return attrs.Get(key)
}
return defVal
}),
),
),
)
ast, iss := env.Compile(`attrs.get("first", attrs.get("second", default))`)
if iss.Err() != nil {
t.Fatalf("e.Parse() failed: %v", iss.Err())
}
// Global variables can be configured as a ProgramOption and optionally overridden on Eval.
// Add a previous globals map to confirm the order of shadowing and a final empty global
// map to show that globals are not clobbered.
prg, err := env.Program(ast,
Globals(map[string]any{
"default": "shadow me",
}),
Globals(map[string]any{
"default": "third",
}),
Globals(map[string]any{}),
)
if err != nil {
t.Fatalf("e.Program() failed: %v", err)
}
t.Run("bad_attrs", func(t *testing.T) {
out, _, err := prg.Eval(map[string]any{
"attrs": []string{"one", "two"},
})
if err == nil {
t.Errorf("prg.Eval() of incorrect arg type invoked function, wanted error, got %v", out)
}
})
t.Run("global_default", func(t *testing.T) {
vars := map[string]any{
"attrs": map[string]any{},
}
out, _, err := prg.Eval(vars)
if err != nil {
t.Fatalf("prg.Eval() failed: %v", err)
}
if out.Equal(types.String("third")) != types.True {
t.Errorf("got '%v', expected 'third'.", out.Value())
}
})
t.Run("attrs_alt", func(t *testing.T) {
vars := map[string]any{
"attrs": map[string]any{"second": "yep"}}
out, _, err := prg.Eval(vars)
if err != nil {
t.Fatalf("prg.Eval(vars) failed: %v", err)
}
if out.Equal(types.String("yep")) != types.True {
t.Errorf("got '%v', expected 'yep'.", out.Value())
}
})
t.Run("local_default", func(t *testing.T) {
vars := map[string]any{
"attrs": map[string]any{},
"default": "fourth"}
out, _, _ := prg.Eval(vars)
if out.Equal(types.String("fourth")) != types.True {
t.Errorf("got '%v', expected 'fourth'.", out.Value())
}
})
}
func TestMacroSubset(t *testing.T) {
// Only enable the 'has' macro rather than all parser macros.
env := testEnv(t,
ClearMacros(), Macros(HasMacro),
Variable("name", MapType(StringType, StringType)),
)
out, err := interpret(t, env, `has(name.first)`,
map[string]any{
"name": map[string]string{
"first": "Jim",
},
})
if err != nil {
t.Fatal(err)
}
if out != types.True {
t.Errorf("got %v, wanted true", out)
}
out, err = interpret(t, env, `[1, 2].all(i, i > 0)`, NoVars())
if err == nil {
t.Errorf("got %v, wanted err", out)
}
}
func TestCustomMacro(t *testing.T) {
joinMacro := NewReceiverMacro("join", 1,
func(meh MacroExprHelper, iterRange *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
delim := args[0]
iterIdent := meh.Ident("__iter__")
accuIdent := meh.AccuIdent()
accuInit := meh.LiteralString("")
condition := meh.LiteralBool(true)
step := meh.GlobalCall(
// __result__.size() > 0 ? __result__ + delim + __iter__ : __iter__
operators.Conditional,
meh.GlobalCall(operators.Greater, meh.ReceiverCall("size", accuIdent), meh.LiteralInt(0)),
meh.GlobalCall(operators.Add, meh.GlobalCall(operators.Add, accuIdent, delim), iterIdent),
iterIdent)
return meh.Fold(
"__iter__",
iterRange,
accuIdent.GetIdentExpr().GetName(),
accuInit,
condition,
step,
accuIdent), nil
})
env := testEnv(t, Macros(joinMacro))
ast, iss := env.Compile(`['hello', 'cel', 'friend'].join(',')`)
if iss.Err() != nil {
t.Fatal(iss.Err())
}
prg, err := env.Program(ast, EvalOptions(OptExhaustiveEval))
if err != nil {
t.Fatalf("program creation error: %s\n", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatal(err)
}
if out.Equal(types.String("hello,cel,friend")) != types.True {
t.Errorf("got %v, wanted 'hello,cel,friend'", out)
}
}
func TestMacroInterop(t *testing.T) {
existsOneMacro := NewReceiverMacro("exists_one", 2,
func(meh MacroExprHelper, iterRange *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
return ExistsOneMacroExpander(meh, iterRange, args)
})
transformMacro := NewReceiverMacro("transform", 2,
func(meh MacroExprHelper, iterRange *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
return MapMacroExpander(meh, iterRange, args)
})
filterMacro := NewReceiverMacro("filter", 2,
func(meh MacroExprHelper, iterRange *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
return FilterMacroExpander(meh, iterRange, args)
})
pairMacro := NewGlobalMacro("pair", 2,
func(meh MacroExprHelper, iterRange *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
return meh.NewMap(meh.NewMapEntry(args[0], args[1], false)), nil
})
getMacro := NewReceiverMacro("get", 2,
func(meh MacroExprHelper, target *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
return meh.GlobalCall(
operators.Conditional,
meh.PresenceTest(meh.Copy(target), args[0].GetIdentExpr().GetName()),
meh.Select(meh.Copy(target), args[0].GetIdentExpr().GetName()),
meh.Copy(args[1]),
), nil
})
env := testEnv(t, Macros(existsOneMacro, transformMacro, filterMacro, pairMacro, getMacro))
tests := []struct {
expr string
out ref.Val
}{
{
expr: `['tr', 's', 'fri'].filter(i, i.size() > 1).transform(i, i + 'end').exists_one(i, i == 'friend')`,
out: types.True,
},
{
expr: `pair('a', 'b')`,
out: types.DefaultTypeAdapter.NativeToValue(map[string]string{"a": "b"}),
},
{
expr: `{}.get(a, 'default')`,
out: types.String("default"),
},
{
expr: `{'a': 'b'}.get(a, 'default')`,
out: types.String("b"),
},
}
for _, tst := range tests {
ast, iss := env.Compile(tst.expr)
if iss.Err() != nil {
t.Fatal(iss.Err())
}
prg, err := env.Program(ast, EvalOptions(OptExhaustiveEval))
if err != nil {
t.Fatalf("program creation error: %s\n", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatal(err)
}
if out.Equal(tst.out) != types.True {
t.Errorf("got %v, wanted %v", out, tst.out)
}
}
}
func TestMacroModern(t *testing.T) {
existsOneMacro := ReceiverMacro("exists_one", 2, parser.MakeExistsOne)
transformMacro := ReceiverMacro("transform", 2, parser.MakeMap)
filterMacro := ReceiverMacro("filter", 2, parser.MakeFilter)
pairMacro := GlobalMacro("pair", 2,
func(mef MacroExprFactory, iterRange celast.Expr, args []celast.Expr) (celast.Expr, *Error) {
return mef.NewMap(mef.NewMapEntry(args[0], args[1], false)), nil
})
getMacro := ReceiverMacro("get", 2,
func(mef MacroExprFactory, target celast.Expr, args []celast.Expr) (celast.Expr, *Error) {
return mef.NewCall(
operators.Conditional,
mef.NewPresenceTest(mef.Copy(target), args[0].AsIdent()),
mef.NewSelect(mef.Copy(target), args[0].AsIdent()),
mef.Copy(args[1]),
), nil
})
env := testEnv(t, Macros(existsOneMacro, transformMacro, filterMacro, pairMacro, getMacro))
tests := []struct {
expr string
out ref.Val
}{
{
expr: `['tr', 's', 'fri'].filter(i, i.size() > 1).transform(i, i + 'end').exists_one(i, i == 'friend')`,
out: types.True,
},
{
expr: `pair('a', 'b')`,
out: types.DefaultTypeAdapter.NativeToValue(map[string]string{"a": "b"}),
},
{
expr: `{}.get(a, 'default')`,
out: types.String("default"),
},
{
expr: `{'a': 'b'}.get(a, 'default')`,
out: types.String("b"),
},
}
for _, tst := range tests {
ast, iss := env.Compile(tst.expr)
if iss.Err() != nil {
t.Fatal(iss.Err())
}
prg, err := env.Program(ast, EvalOptions(OptExhaustiveEval))
if err != nil {
t.Fatalf("program creation error: %s\n", err)
}
out, _, err := prg.Eval(NoVars())
if err != nil {
t.Fatal(err)
}
if out.Equal(tst.out) != types.True {
t.Errorf("got %v, wanted %v", out, tst.out)
}
}
}
func TestCustomExistsMacro(t *testing.T) {
env := testEnv(t,
Variable("attr", MapType(StringType, BoolType)),
Macros(
NewGlobalVarArgMacro("kleeneOr",
func(meh MacroExprHelper, unused *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
inputs := meh.NewList(args...)
eqOne, err := ExistsMacroExpander(meh, inputs, []*exprpb.Expr{
meh.Ident("__iter__"),
meh.GlobalCall(operators.Equals, meh.Ident("__iter__"), meh.LiteralInt(1)),
})
if err != nil {
return nil, err
}
eqZero, err := ExistsMacroExpander(meh, meh.Copy(inputs), []*exprpb.Expr{
meh.Ident("__iter__"),
meh.GlobalCall(operators.Equals, meh.Ident("__iter__"), meh.LiteralInt(0)),
})
if err != nil {
return nil, err
}
return meh.GlobalCall(
operators.Conditional,
eqOne,
meh.LiteralInt(1),
meh.GlobalCall(
operators.Conditional,
eqZero,
meh.LiteralInt(0),
meh.LiteralInt(-1),
),
), nil
},
),
NewGlobalMacro("kleeneEq", 2,
func(meh MacroExprHelper, unused *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
attr := args[0]
value := args[1]
hasAttr, err := HasMacroExpander(meh, nil, []*exprpb.Expr{meh.Copy(attr)})
if err != nil {
return nil, err
}