40 lines
743 B
Go
40 lines
743 B
Go
package engine
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"os"
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"strings"
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)
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func Loop(startSym string, en *Engine, ctx context.Context) error {
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err := en.Init(startSym, ctx)
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if err != nil {
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return fmt.Errorf("cannot init: %v\n", err)
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}
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b := bytes.NewBuffer(nil)
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en.WriteResult(b)
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fmt.Println(b.String())
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running := true
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for running {
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reader := bufio.NewReader(os.Stdin)
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in, err := reader.ReadString('\n')
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if err != nil {
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return fmt.Errorf("cannot read input: %v\n", err)
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}
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in = strings.TrimSpace(in)
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running, err = en.Exec([]byte(in), ctx)
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if err != nil {
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return fmt.Errorf("unexpected termination: %v\n", err)
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}
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b := bytes.NewBuffer(nil)
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en.WriteResult(b)
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fmt.Println(b.String())
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}
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return nil
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}
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