gocsv.go Simple CSV parsing with GO
Recently I was working with CSV files in Ruby. Parsing CSV files in Ruby code is easy, thanks to Ruby/csv.
Let’s try it with golang.
Go seems to be the pretty power-packed language for developers. Go, also commonly referred to as golang, is a programming language initially developed at Google in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson. It is a statically-typed language with a syntax loosely derived from that of C, adding garbage collection, type safety, some dynamic-typing capabilities, additional built-in types such as variable-length arrays and key-value maps, and a large standard library. And since it’s from Google, the big giant, Go has built-in support for concurrency with go-routines, channels and select.
Let’s get to work now.
| //Simple CSV reader | |
| package main | |
| import ( | |
| “encoding/csv“ //Package csv reads and writes comma-separated values (CSV) files. | |
| “fmt“ //Package fmt implements formatted I/O with functions analogous to C’s printf and scanf. | |
| “io“ //Package io provides basic interfaces to I/O primitives. | |
| “os“ //Package os provides a platform-independent interface to operating system functionality. | |
| ) | |
| // Ref http://golang.org/pkg/ for more on packages and links to documentation | |
| func main() { | |
| //Check for command-line argument filename. | |
| //Ignore additional arguments. | |
| if len(os.Args) < 2 { | |
| fmt.Printf(“Error: Source file name is required\n“) | |
| fmt.Println(“Usage:“, os.Args[0], “<filename> \n“) | |
| return | |
| } | |
| file, err := os.Open(os.Args[1]) | |
| if err != nil { | |
| fmt.Println(“Error:“, err) | |
| return | |
| } | |
| // deferred call to Close() at the end of current method | |
| defer file.Close() | |
| //get a new cvsReader for reading file | |
| reader := csv.NewReader(file) | |
| //Configure reader options Ref http://golang.org/src/pkg/encoding/csv/reader.go?s=#L81 | |
| reader.Comma = ‘;‘ //field delimiter | |
| reader.Comment = ‘#‘ //Comment character | |
| reader.FieldsPerRecord = -1 //Number of records per record. Set to Negative value for variable | |
| reader.TrimLeadingSpace = true | |
| lineCount := 1 | |
| for { | |
| // read just one record, but we could ReadAll() as well | |
| record, err := reader.Read() | |
| // end-of-file is fitted into err | |
| if err == io.EOF { | |
| break | |
| } else if err != nil { | |
| fmt.Println(“Error:“, err) | |
| lineCount += 1 | |
| reader.Read() | |
| continue | |
| } | |
| // record is array of strings Ref http://golang.org/src/pkg/encoding/csv/reader.go?s=#L134 | |
| fmt.Printf(“Record %d: %s\n“, lineCount, record) | |
| lineCount += 1 | |
| } | |
| } |
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