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|
package main
import (
"bufio"
"fmt"
"io"
"strconv"
"strings"
)
func parseRESP(reader *bufio.Reader) ([]string, error) {
line, err := reader.ReadString('\n')
if err != nil {
return nil, err
}
if len(line) == 0 {
return nil, fmt.Errorf("empty line")
}
switch line[0] {
case '*':
var args []string
argC, _ := strconv.Atoi(strings.TrimSpace(line[1:]))
for i := 0; i < argC; i++ {
nestedArgs, err := parseRESP(reader)
if err != nil {
return nil, err
}
args = append(args, nestedArgs...)
}
return args, nil
case '$':
strLen, _ := strconv.Atoi(strings.TrimSpace(line[1:]))
if strLen == -1 {
return []string{""}, nil
}
buf := make([]byte, strLen)
_, err = io.ReadFull(reader, buf)
if err != nil {
return nil, err
}
_, err = reader.Discard(2)
if err != nil {
return nil, err
}
return []string{string(buf)}, nil
case '+':
cleanStr := strings.TrimSpace(line[1:])
return []string{cleanStr}, nil
case ':':
return []string{strings.TrimSpace(line[1:])}, nil
default:
return nil, fmt.Errorf("unknown command type: %c", line[0])
}
}
|
