gocsv.go Simple CSV parsing with GO

gocsv.go Simple CSV parsing with GO

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
}
}
view raw gocsv.go hosted with ❤ by GitHub

 

Here is a sample CSV file for tests.

Output:

 

 

gocsvgo

 

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