英文:
Parse formatted string in Golang
问题
我正在尝试使用Golang解析GNSS RINEX文件。
例如，这是VERSION行的RINEX规范：
+--------------------+------------------------------------------+------------+|RINEX VERSION / TYPE| - 格式版本 (2.11) | F9.2,11X, || | - 文件类型 ('O' 表示观测数据) | A1,19X, || | - 卫星系统: 空白或 'G': GPS | A1,19X || | 'R': GLONASS | || | 'S': Geostationary | || | signal payload | || | 'E': Galileo | || | 'M': Mixed | |+--------------------+------------------------------------------+------------+
RINEX文件中的每一行都有固定的宽度为80个ASCII字符 + "\n"。在这个例子中，前9个字符表示版本号（浮点数）。
在Python中，我可以使用：
struct.unpack("9s11s1s19s1s19s20s", line)
这将返回一个包含7个字符串的元组。
我是Go的新手，一直在尝试使用fmt.Sscanf来读取格式化文本：
func main() {str := " 2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE\n"var value float32a, err := fmt.Sscanf(str,"%9.2f", &value)fmt.Println(a)fmt.Println(err)fmt.Println(value)}
返回：
0bad verb %. for float320
Go中是否有任何包允许解析固定宽度的数据？
如果没有，编写类似于Python的struct的东西可能是一个好方法吗？
英文:
I'm trying to parse a GNSS RINEX file using Golang.
For example, here's the RINEX specification for the VERSION line:
+--------------------+------------------------------------------+------------+|RINEX VERSION / TYPE| - Format version (2.11) | F9.2,11X, || | - File type ('O' for Observation Data) | A1,19X, || | - Satellite System: blank or 'G': GPS | A1,19X || | 'R': GLONASS | || | 'S': Geostationary | || | signal payload | || | 'E': Galileo | || | 'M': Mixed | |+--------------------+------------------------------------------+------------+
Each line in a RINEX file has a fixed width of 80 ASCII characters + "\n". In this example the first 9 characters represent the version number (float).
In Python I might use:
struct.unpack("9s11s1s19s1s19s20s", line)
which would return a tuple with 7 strings.
I'm new to go and have been trying to use fmt.Sscanf for reading formatted text:
func main() {str := " 2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE\n"var value float32a, err := fmt.Sscanf(str,"%9.2f", &value)fmt.Println(a)fmt.Println(err)fmt.Println(value)}
returns:
0bad verb %. for float320
Is there any package in go that permits parsing of fixed width data?
And if not, what might be a good approach for writing something similar to Python's struct?
答案1
得分: 4
例如，
package mainimport ("errors""fmt""strconv""strings")// http://gage14.upc.es/gLAB/HTML/LaunchHTML.html// http://gage14.upc.es/gLAB/HTML/Observation_Rinex_v2.11.htmlfunc parseVersionType(line string) (version float64, fileType, satellite, label string, err error) {label = line[60:80]if label != "RINEX VERSION / TYPE" {err = errors.New("未知的头标签")return}version, err = strconv.ParseFloat(strings.TrimSpace(line[0:9]), 64)if err != nil {return}fileType = line[20:21]satellite = line[40:41]return}func main() {line := " 2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE\n"version, fileType, satellite, label, err := parseVersionType(line)fmt.Printf("%g %q %q %q %v\n", version, fileType, satellite, label, err)}
输出：
2.11 "O" "G" "RINEX VERSION / TYPE" <nil>
英文:
For example,
package mainimport ("errors""fmt""strconv""strings")// http://gage14.upc.es/gLAB/HTML/LaunchHTML.html// http://gage14.upc.es/gLAB/HTML/Observation_Rinex_v2.11.htmlfunc parseVersionType(line string) (version float64, fileType, satellite, label string, err error) {label = line[60:80]if label != "RINEX VERSION / TYPE" {err = errors.New("Unknown header label")return}version, err = strconv.ParseFloat(strings.TrimSpace(line[0:9]), 64)if err != nil {return}fileType = line[20:21]satellite = line[40:41]return}func main() {line := " 2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE\n"version, fileType, satellite, label, err := parseVersionType(line)fmt.Printf("%g %q %q %q %v\n", version, fileType, satellite, label, err)}
Output:
2.11 "O" "G" "RINEX VERSION / TYPE" <nil>
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论