On 03/18/2012 07:45 AM, bioinfornatics wrote:
> dear, i have this data:
> ________________________________
> data1 data2 data3a;data3b;data3c
> cata1 cata2 cata3a;cata3b;cata3c
> tata1 tata2 tata3a;tata3b;tata3c
> ________________________________
>
> field are sepaated by tab but third field contain data separeted by semi
> colon
>
> I have try:
> ________________________________
> import std.csv;
> import std.string;
> import std.stdio;
>
> struct Data{
> public:
> string field1;
> string field2;
>
> @property void field3( string field ){
> _field3 = field.split(";");
> }
> @property string[] field3( ){
> return _field3;
> }
Besides the confusion that Jesse Phillips has pointed out, csvReader
cannot decide to treat those two property functions as if they represent
a member of Data.
>
> private:
> string[] _field3;
Data still has three members: field1, field2, and _field3.
The problem is, although the format clearly states that there are three
strings that are delimited by '\t', the third field of the struct is not
a string.
> }
>
> void main(){
> Data[] result;
> File f = File( "data.csv", "r" );
> foreach( char[] line; f.byLine() ){
> result ~= csvReader!Data(line, '\t').front;
> }
> }
So the solution is that _field3 must be a string:
import std.csv;
import std.string;
import std.stdio;
struct Data{
public:
string field1;
string field2;
private:
string _field3;
}
void main(){
Data[] result;
File f = File( "data.csv", "r" );
foreach( char[] line; f.byLine() ){
result ~= csvReader!Data(line, '\t').front;
}
writeln(result);
}
You must provide the properties on top of that:
import std.csv;
import std.string;
import std.stdio;
struct Data{
public:
string field1;
string field2;
void field3( string[] field ) @property {
_field3 = field.join();
}
string[] field3( ) @property {
return _field3.split(";");
}
string toString() {
return format("%s,%s,%s", field1, field2, field3);
}
private:
string _field3;
}
void main(){
Data[] result;
File f = File( "data.csv", "r" );
foreach( char[] line; f.byLine() ){
result ~= csvReader!Data(line, '\t').front;
}
writeln(result);
}
Note that to avoid confusing the readers, the property functions both
use string[], not string. (I've also put @property at the end of the
function signature, which I started to favor recently.)
The optimizations can come after that. The following calls split() only
whene necessary:
import std.csv;
import std.string;
import std.stdio;
struct Data{
public:
string field1;
string field2;
void field3( string[] field ) @property {
_field3 = field;
_raw_field3 = null;
}
string[] field3( ) @property {
if (_raw_field3 !is null) {
_field3 = _raw_field3.split(";");
}
return _field3;
}
string toString() {
return format("%s,%s,%s", field1, field2, field3);
}
private:
string _raw_field3;
string[] _field3;
}
void main(){
Data[] result;
File f = File( "data.csv", "r" );
foreach( char[] line; f.byLine() ){
result ~= csvReader!Data(line, '\t').front;
}
writeln(result);
}
Ali
