/
eval.go
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/
eval.go
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//
// Copyright © 2018 Aljabr, Inc.
//
// 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 cmd
import (
"fmt"
"io/ioutil"
"log"
"os"
"github.com/spf13/cobra"
"github.com/kocircuit/kocircuit/lang/go/runtime"
"github.com/kocircuit/kocircuit/lang/go/sys"
)
// evalCmd represents the eval command
var evalCmd = &cobra.Command{
Use: "eval",
Short: "Evaluate a Ko expression",
Long: `Evaluate a Ko expression against builtin functions.
For example,
ko eval -e'And(true, Xor(true, false))'
`,
Run: func(cmd *cobra.Command, args []string) {
expr := flagEvalExpr
if expr == "" {
if buf, err := ioutil.ReadAll(os.Stdin); err != nil {
log.Fatalf("reading standard input (%v)", err)
} else {
expr = string(buf)
}
}
e := &sys.Eval{KoExpr: expr}
if result := e.Play(runtime.CompilerContext()); result.Error != nil {
log.Fatalln(result.Error)
} else {
fmt.Printf("%v\n", result.Returned)
}
},
}
var flagEvalExpr string
func init() {
RootCmd.AddCommand(evalCmd)
evalCmd.PersistentFlags().StringVarP(&flagEvalExpr, "expr", "e", "", "Ko expression to evaluate, otherwise read from STDIN.")
}