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// Copyright 2023 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 ext
import (
"fmt"
"strings"
"testing"
"github.com/google/cel-go/cel"
)
var bindingTests = []struct {
expr string
parseOnly bool
}{
{expr: `cel.bind(a, 'hell' + 'o' + '!', [a, a, a].join(', ')) ==
['hell' + 'o' + '!', 'hell' + 'o' + '!', 'hell' + 'o' + '!'].join(', ')`},
// Variable shadowing
{expr: `cel.bind(a,
cel.bind(a, 'world', a + '!'),
'hello ' + a) == 'hello ' + 'world' + '!'`},
}
func TestBindings(t *testing.T) {
env, err := cel.NewEnv(Bindings(), Strings())
if err != nil {
t.Fatalf("cel.NewEnv(Bindings(), Strings()) failed: %v", err)
}
for i, tst := range bindingTests {
tc := tst
t.Run(fmt.Sprintf("[%d]", i), func(t *testing.T) {
var asts []*cel.Ast
pAst, iss := env.Parse(tc.expr)
if iss.Err() != nil {
t.Fatalf("env.Parse(%v) failed: %v", tc.expr, iss.Err())
}
asts = append(asts, pAst)
if !tc.parseOnly {
cAst, iss := env.Check(pAst)
if iss.Err() != nil {
t.Fatalf("env.Check(%v) failed: %v", tc.expr, iss.Err())
}
asts = append(asts, cAst)
}
for _, ast := range asts {
prg, err := env.Program(ast)
if err != nil {
t.Fatal(err)
}
out, _, err := prg.Eval(cel.NoVars())
if err != nil {
t.Fatal(err)
} else if out.Value() != true {
t.Errorf("got %v, wanted true for expr: %s", out.Value(), tc.expr)
}
}
})
}
}
func TestBindingsNonMatch(t *testing.T) {
env, err := cel.NewEnv(Bindings(), Strings())
if err != nil {
t.Fatalf("cel.NewEnv(Bindings(), Strings()) failed: %v", err)
}
nonMatchExpr := `ceel.bind(a, 1, a)`
ast, iss := env.Parse(nonMatchExpr)
if iss.Err() != nil {
t.Fatalf("env.Parse(%v) failed: %v", nonMatchExpr, iss.Err())
}
if len(ast.SourceInfo().GetMacroCalls()) != 0 {
t.Fatalf("env.Parse(%v) performed a macro replacement when none was expected: %v",
nonMatchExpr, ast.SourceInfo().GetMacroCalls())
}
}
func TestBindingsInvalidIdent(t *testing.T) {
env, err := cel.NewEnv(Bindings(), Strings())
if err != nil {
t.Fatalf("cel.NewEnv(Bindings(), Strings()) failed: %v", err)
}
invalidIdentExpr := `cel.bind(a.b, 1, a.b)`
wantErr := "ERROR: <input>:1:11: cel.bind() variable names must be simple identifiers"
_, iss := env.Parse(invalidIdentExpr)
if !strings.Contains(iss.Err().Error(), wantErr) {
t.Fatalf("env.Parse(%v) failed: %v", invalidIdentExpr, iss.Err())
}
}
func BenchmarkBindings(b *testing.B) {
env, err := cel.NewEnv(Bindings(), Strings())
if err != nil {
b.Fatalf("cel.NewEnv(Bindings(), Strings()) failed: %v", err)
}
for i, tst := range bindingTests {
tc := tst
ast, iss := env.Compile(tc.expr)
if iss.Err() != nil {
b.Fatalf("env.Compile(%q) failed: %v", tc.expr, iss.Err())
}
prg, err := env.Program(ast, cel.EvalOptions(cel.OptOptimize))
if err != nil {
b.Fatalf("env.Program(ast, Optimize) failed: %v", err)
}
// Benchmark the eval.
b.Run(fmt.Sprintf("[%d]", i), func(b *testing.B) {
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
prg.Eval(cel.NoVars())
}
})
}
}
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