pspp 0.6.1

Statistical analysis software
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

// PSPP - a program for statistical analysis.
// Copyright (C) 2025 Free Software Foundation, Inc.
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along with
// this program.  If not, see <http://www.gnu.org/licenses/>.

use std::{borrow::Cow, fs::File, io::BufWriter, path::PathBuf, sync::Arc};

use serde::{Deserialize, Serialize};

use crate::{
    data::{ByteString, Case, Datum},
    dictionary::Dictionary,
    sys::{WriteOptions, Writer, raw::records::Compression},
};

use super::{CaseWriter, Driver, Item};

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct SavConfig {
    file: PathBuf,
    compression: Option<Compression>,
}

pub struct SavDriver {
    file: PathBuf,
    compression: Option<Compression>,
}

impl SavDriver {
    pub fn new(config: &SavConfig) -> std::io::Result<Self> {
        Ok(Self {
            file: config.file.clone(),
            compression: config.compression,
        })
    }
}

impl Driver for SavDriver {
    fn name(&self) -> Cow<'static, str> {
        Cow::from("sav")
    }

    fn write(&mut self, _item: &Arc<Item>) {
        todo!()
    }

    fn can_write_data_file(&self) -> bool {
        true
    }

    fn write_data_file<'a>(
        &'a mut self,
        dictionary: &'a Dictionary,
    ) -> anyhow::Result<Option<Box<dyn CaseWriter + 'a>>> {
        Ok(Some(Box::new(SavDriverCaseWriter {
            writer: WriteOptions::new()
                .with_compression(self.compression)
                .write_file(&dictionary, &self.file)?,
        })))
    }
}

struct SavDriverCaseWriter {
    writer: Writer<BufWriter<File>>,
}

impl CaseWriter for SavDriverCaseWriter {
    fn write_case(&mut self, case: Case<Vec<Datum<ByteString>>>) -> anyhow::Result<()> {
        self.writer.write_case(case)?;
        Ok(())
    }
}