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repl.go
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repl.go
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package main
import (
"bufio"
"bytes"
"io"
"log"
"os"
"github.com/prog-lang/brainf-go/cpu"
"github.com/prog-lang/brainf-go/parse"
)
type REPL struct {
*stdio
notFirstLoop bool
}
type stdio struct {
*bufio.Reader
*bufio.Writer
}
func NewREPL() *REPL {
return &REPL{
stdio: &stdio{
Reader: bufio.NewReader(os.Stdin),
Writer: bufio.NewWriter(os.Stdout),
},
}
}
func (repl *REPL) Start() {
for {
repl.loop()
}
}
func (repl *REPL) loop() {
src, err := repl.read()
if err != nil {
log.Printf("failed to read source code: %s", err)
return
}
code, err := parse.FromReader(bytes.NewReader(src))
if err != nil {
log.Printf("failed to parse source code: %s", err)
return
}
if err := cpu.Default(code).Start().Error(); err != nil {
log.Printf("panic during execution: %v", err)
}
}
func (repl *REPL) read() (src []byte, err error) {
repl.promptStart()
src, err = io.ReadAll(repl)
repl.promptEnd()
return
}
func (repl *REPL) promptStart() {
if repl.notFirstLoop {
repl.WriteByte('\n')
}
repl.notFirstLoop = true
repl.WriteString("❯❯❯\n")
repl.Flush()
}
func (repl *REPL) promptEnd() {
repl.WriteString("❮❮❮\n")
repl.Flush()
}