Re: trouble with associative Arrays

[Renato via Digitalmars-d-learn]

On Saturday, 20 January 2024 at 15:16:00 UTC, atzensepp wrote:
The section looks now simpler although I guess that there are 
more appropriate mechanisms available (csvreader):


string [] orgids[string];
foreach (line; range)
{
if (!line.empty)
{
auto row = line.split(";");
string word = row[1];
if(word.length>0 && word[0] == '\"')
word= word[1 .. $-1];
orgids[word]=row;
i++;
}
}


Maybe a bit more readable:

```d
 import std.string :  strip, split;
 string [] orgids[string];
 foreach (line; range)
 {
 if (line.empty) continue;
 auto row = line.split(";");
 auto word = row[1].strip("\"");
 orgids[word] = row;
 i++;
 }
```

Re: trouble with associative Arrays

[atzensepp via Digitalmars-d-learn]

Thank you T for your hint. This worked perfectly
On Saturday, 20 January 2024 at 14:44:49 UTC, H. S. Teoh wrote:
Because .byLine reuses its line buffer.  You want .byLineCopy 
instead.


The section looks now simpler although I guess that there are 
more appropriate mechanisms available (csvreader):


string [] orgids[string];
foreach (line; range)
{
if (!line.empty)
{
auto row = line.split(";");
string word = row[1];
if(word.length>0 && word[0] == '\"')
word= word[1 .. $-1];
orgids[word]=row;
i++;
}
}

Re: trouble with associative Arrays

[H. S. Teoh via Digitalmars-d-learn]

On Sat, Jan 20, 2024 at 02:33:24PM +, atzensepp via Digitalmars-d-learn 
wrote:
> Hello,
> 
> I am new with D and want to convert a c program for a csv file manipulation
> with exhaustive dynamic memory mechanics to D .
> 
> When reading a CSV-file line by line I would like to create an associative
> array to get the row values by the value in the second column.
> Although I save the rows in an array (to get different pointers to the
> values) the program below always gives the last row.
[...]

Because .byLine reuses its line buffer.  You want .byLineCopy instead.


T

-- 
Everybody talks about it, but nobody does anything about it!  -- Mark Twain

trouble with associative Arrays

[atzensepp via Digitalmars-d-learn]

Hello,

I am new with D and want to convert a c program for a csv file 
manipulation with exhaustive dynamic memory mechanics to D .


When reading a CSV-file line by line I would like to create an 
associative array to get the row values by the value in the 
second column.
Although I save the rows in an array (to get different pointers 
to the values) the program below always gives the last row.

I am sure someone could help.

thanks


void main( string args[])
{
auto file = File("transpatch2_orig.csv"); // Open for 
reading

auto range = file.byLine();
// Print first three lines
foreach (line; range.take(1))
writeln(line);
auto i=0;

char [][] [string] orgids;
char [][][] rows;
foreach (line; range)
{
if (!line.empty)
{
   // auto row = line.split(";");
rows ~= (line.split(";"));
string word = rows[$ - 1][1].idup;
if(word.length>0 && word[0] == '\"')
word= word[1 .. $-1];
orgids[word.idup]=rows[$ - 1];
i++;
}
}

writeln( orgids.length);
writeln( args[1],orgids[args[1]]);
writeln( args[2],orgids[args[2]]);
writeln("Lines: ",i);
}