英文:
How to convert string with index number to target slice item
问题
我有这个字符串：
"books[1]"
我有这个切片：
books := []string{"wadidaw", "bededaw", "celepaw"}
如何将这个字符串转换为能够定位到books索引1的形式，就像下面这样：
fmt.Println("书名：", books[1]) // 书名：bededaw
英文:
I have this string:
"books[1]"
And I have this slice:
books := []string{"wadidaw", "bededaw", "celepaw"}
How to convert this string: "books[1]" to be able to target books index 1 like the following:
fmt.Println("Book title: ", books[1]) // Book title: bededaw
答案1
得分: 2
你需要将字符串解析为代码。
package mainimport ("fmt""strconv")func main() {books := map[int]string{0: "wadidaw",1: "bededaw",2: "celepaw",}target := "books[1]"value, err := getValueByString(target, books)if err != nil {fmt.Println("Error:", err)} else {fmt.Println("Book title:", value)}}func getValueByString(target string, data map[int]string) (interface{}, error) {parts := splitTarget(target)if len(parts) != 2 {return nil, fmt.Errorf("invalid target format: %s", target)}// 获取变量名和索引varName := parts[0]index, err := strconv.Atoi(parts[1])if err != nil {return nil, fmt.Errorf("invalid index: %s", parts[1])}// 检查变量是否存在value, ok := data[index]if !ok {return nil, fmt.Errorf("variable not found: %s", varName)}return value, nil}func splitTarget(target string) []string {parts := make([]string, 2)// 找到开括号的索引braceIndex := -1for i, char := range target {if char == '[' {braceIndex = ibreak}}// 提取变量名和索引if braceIndex != -1 {parts[0] = target[:braceIndex]parts[1] = target[braceIndex+1 : len(target)-1]}return parts}
请随意使用 Go Playground 进行测试。
https://go.dev/play/p/-q2JUn-N4Sg
英文:
You'll need to parse string as code.
package mainimport ("fmt""strconv")func main() {books := map[int]string{0: "wadidaw",1: "bededaw",2: "celepaw",}target := "books[1]"value, err := getValueByString(target, books)if err != nil {fmt.Println("Error:", err)} else {fmt.Println("Book title:", value)}}func getValueByString(target string, data map[int]string) (interface{}, error) {parts := splitTarget(target)if len(parts) != 2 {return nil, fmt.Errorf("invalid target format: %s", target)}// Get the variable name and indexvarName := parts[0]index, err := strconv.Atoi(parts[1])if err != nil {return nil, fmt.Errorf("invalid index: %s", parts[1])}// Check if the variable existsvalue, ok := data[index]if !ok {return nil, fmt.Errorf("variable not found: %s", varName)}return value, nil}func splitTarget(target string) []string {parts := make([]string, 2)// Find the index of the opening bracketbraceIndex := -1for i, char := range target {if char == '[' {braceIndex = ibreak}}// Extract the variable name and indexif braceIndex != -1 {parts[0] = target[:braceIndex]parts[1] = target[braceIndex+1 : len(target)-1]}return parts}
Please feel free to use the Go playground
答案2
得分: 0
这是一种非常简单的方法来解析字符串并获取索引值。
package mainimport ("fmt""strconv""strings")func main() {books := []string{"wadidaw","bededaw","celepaw",}str := "books[1]"index, sliceName, err := getIndex(str)if err != nil {panic(err)}// 检查索引是否有效，它应该大于0且小于(切片长度-1)if index < 0 || index > len(books)-1 {panic("无效的索引")}fmt.Println("切片名称：", sliceName)fmt.Println("值：", books[index])}func getIndex(str string) (int, string, error) {// 在 [ 处拆分字符串parts := strings.Split(str, "[")if len(parts) != 2 {return 0, "", fmt.Errorf("无法解析 %v，语法无效", str)}name := parts[0]index := strings.TrimSuffix(parts[1], "]")// 将索引转换为整数indexInt, err := strconv.Atoi(index)if err != nil {return 0, "", fmt.Errorf("无法将 '%s' 解析为整数", index)}return indexInt, name, nil}
英文:
Here is a very simple approach to parse the string and getting the index value.
package mainimport ("fmt""strconv""strings")func main() {books := []string{"wadidaw","bededaw","celepaw",}str := "books[1]"index, sliceName, err := getIndex(str)if err != nil {panic(err)}// Check the index is valid as it will be greater than 0 and less than (slice length - 1)if index < 0 || index > len(books)-1 {panic("invalid index")}fmt.Println("Slice name : ", sliceName)fmt.Println("Value : ", books[index])}func getIndex(str string) (int, string, error) {// split the string at [parts := strings.Split(str, "[")if len(parts) != 2 {return 0, "", fmt.Errorf("unable to parse %v, invalid syntax", str)}name := parts[0]index := strings.TrimSuffix(parts[1], "]")// convert the index into intindexInt, err := strconv.Atoi(index)if err != nil {return 0, "", fmt.Errorf("unable to parse '%s' into int", index)}return indexInt, name, nil}
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