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// Copyright 2020 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 examples
import (
"fmt"
"log"
"github.com/google/cel-go/cel"
)
func ExampleSimple() {
env, err := cel.NewEnv(cel.Variable("name", cel.StringType))
if err != nil {
log.Fatalf("environment creation error: %v\n", err)
}
ast, iss := env.Compile(`"Hello world! I'm " + name + "."`)
// Check iss for compilation errors.
if iss.Err() != nil {
log.Fatalln(iss.Err())
}
prg, err := env.Program(ast)
if err != nil {
log.Fatalln(err)
}
out, _, err := prg.Eval(map[string]any{
"name": "CEL",
})
if err != nil {
log.Fatalln(err)
}
fmt.Println(out)
// Output:Hello world! I'm CEL.
}
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