46 lines
902 B
Go
46 lines
902 B
Go
package engine
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"strings"
|
|
)
|
|
|
|
func Loop(en *Engine, startSym string, ctx context.Context, reader io.Reader, writer io.Writer) error {
|
|
err := en.Init(startSym, ctx)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot init: %v\n", err)
|
|
}
|
|
|
|
b := bytes.NewBuffer(nil)
|
|
en.WriteResult(b)
|
|
fmt.Println(b.String())
|
|
|
|
running := true
|
|
bufReader := bufio.NewReader(reader)
|
|
for running {
|
|
in, err := bufReader.ReadString('\n')
|
|
if err == io.EOF {
|
|
log.Printf("EOF found, that's all folks")
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("cannot read input: %v\n", err)
|
|
}
|
|
in = strings.TrimSpace(in)
|
|
running, err = en.Exec([]byte(in), ctx)
|
|
if err != nil {
|
|
return fmt.Errorf("unexpected termination: %v\n", err)
|
|
}
|
|
b := bytes.NewBuffer(nil)
|
|
en.WriteResult(b)
|
|
writer.Write(b.Bytes())
|
|
writer.Write([]byte{0x0a})
|
|
}
|
|
return nil
|
|
}
|