Groovy Split CSV - csv

Question

I have a csv file (details.csv) like
ID,NAME,ADDRESS
1,"{foo,bar}","{123,mainst,ny}"
2,"{abc,def}","{124,mainst,Va}"
3,"{pqr,xyz}","{125,mainst,IL}"
when I use (Note: I have other closure above this which reads all csv files from directory)
if(file.getName().equalsIgnoreCase("deatails.csv")) {
input = new FileInputStream(file)
reader = new BufferedReader(new InputStreamReader(input))
reader.eachLine{line-> def cols = line.split(",")
println cols.size() }
Instead of getting size 3 I am getting 6 with values
1
"{foo
bar}"
"{123
mainst
ny}"
spilt(",") is splitting data by comma(,) but I want my results as
1
"{foo,bar}"
"{123,mainst,ny}"
How can I fix this closure. Please help! Thanks

Answer 1

Writing a csv parser is a tricky business.
I would let someone else do the hard work, and use something like GroovyCsv
Here is how to parse it with GroovyCsv
// I'm using Grab instead of just adding the jar and its
// dependencies to the classpath
#Grab( 'com.xlson.groovycsv:groovycsv:1.0' )
import com.xlson.groovycsv.CsvParser
def csv = '''ID,NAME,ADDRESS
1,"{foo,bar}","{123,mainst,ny}"
2,"{abc,def}","{124,mainst,Va}"
3,"{pqr,xyz}","{125,mainst,IL}"'''
def csva = CsvParser.parseCsv( csv )
csva.each {
println it
}
Which prints:
ID: 1, NAME: {foo,bar}, ADDRESS: {123,mainst,ny}
ID: 2, NAME: {abc,def}, ADDRESS: {124,mainst,Va}
ID: 3, NAME: {pqr,xyz}, ADDRESS: {125,mainst,IL}
So, to get the NAME field of the second row, you could do:
def csvb = CsvParser.parseCsv( csv )
println csvb[ 1 ].NAME
Which prints
{abc,def}
Of course, if the CSV is a File, you can do:
def csvc = new File( 'path/to/csv' ).withReader {
CsvParser.parseCsv( it )
}
Then use it as above

Answer 2

There are two ways of doing.
One is using collect
def processCsvData(Map csvDataMap, File file)
{
InputStream inputFile = new FileInputStream(file);
String[] lines = inputFile.text.split('\n')
List<String[]> rows = lines.collect {it.split(',')}
// Add processing logic
}
Here problem is it is removing commas in between braces ({}) i.e "{foo,bar}" becomes "{foo bar}"
Another way of using java, and this works just fine
public class CSVParser {
/*
* This Pattern will match on either quoted text or text between commas, including
* whitespace, and accounting for beginning and end of line.
*/
private final Pattern csvPattern = Pattern.compile("\"([^\"]*)\"|(?<=,|^)([^,]*)(?:,|$)");
private ArrayList<String> allMatches = null;
private Matcher matcher = null;
private int size;
public CSVParser() {
allMatches = new ArrayList<String>();
matcher = null;
}
public String[] parse(String csvLine) {
matcher = csvPattern.matcher(csvLine);
allMatches.clear();
String match;
while (matcher.find()) {
match = matcher.group(1);
if (match!=null) {
allMatches.add(match);
}
else {
allMatches.add(matcher.group(2));
}
}
size = allMatches.size();
if (size > 0) {
return allMatches.toArray(new String[size]);
}
else {
return new String[0];
}
}
}
Hope this helps!