On Tue, Apr 12, 2011 at 02:31:14AM -0300, Michel Boaventura wrote:
Hello,
Talking with Ben I decide to try to make an excel data import to pspp.
I've found libxls (http://libxls.sourceforge.net/) an LGPL3
library to help read this kind of file.
I was able to make a small program that open an excel file and returns
it as a csv. It would be very nice if you could help me to
improve/plug it into
pspp. Where do I start?
Importing XLS files would certainly be a good thing to have. It sounds
like you already have a working proof of concept.
Where to start? src/language/data-io/get-data.c contains the parser
for the GET DATA command. Currently we have the code:
if (lex_match_id (lexer, "GNM"))
return parse_get_gnm (lexer, ds);
else if (lex_match_id (lexer, "TXT"))
return parse_get_txt (lexer, ds);
else if (lex_match_id (lexer, "PSQL"))
return parse_get_psql (lexer, ds);
So you'll have to add a "XLS" to that. The options for importing an
excel spreadsheet are likely to be similar (if not identical) to those
for gnumeric. So parse_get_gnm could probably be renamed to
parse_get_spreadsheet (and suffer a few very small modifications).
Then, you will need to implement the code to read the stuff in. This
would entail taking your program and turning it into an implementation
of a casereader which grabs rows from the excel file. Like this:
struct casereader * excel_open_reader (struct excel_read_opts *, struct
dictionary **);
The code in src/data/gnumeric-reader.c can probably be used as a template.
Again, much
of the code might well be identical to what you need.
So. Get the syntax :
GET DATA /TYPE=XLS /FILE= ....
all working and take it from there.
Post a message here, or shout on #pspp if you need help.
J'
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