csvpp 0.5.0

Compile csvpp source code to a target spreadsheet format
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

use crate::{Cell, Module, Options, Result};
use std::cmp;

mod csv;
mod excel;
mod file_backer_upper;
mod google_sheets;
mod open_document;

pub(crate) use crate::target::csv::Csv;
pub(crate) use excel::Excel;
pub(crate) use google_sheets::GoogleSheets;
pub(crate) use open_document::OpenDocument;

#[derive(Clone, Debug, PartialEq)]
pub(crate) enum ExistingCell<V: Clone> {
    Value(V),
    Empty,
}

#[derive(Clone, Debug, Default, PartialEq)]
pub(crate) struct ExistingValues<V: Clone> {
    cells: Vec<Vec<ExistingCell<V>>>,
}

pub trait CompilationTarget {
    /// Create a backup of the spreadsheet, at the given target (for most this is making a copy of
    /// a file, but different for Google Sheets
    fn write_backup(&self) -> Result<()>;

    /// Write the compiled `Module` to the target.
    fn write(&self, module: &Module) -> Result<()>;
}

#[derive(Clone, Debug, PartialEq)]
pub(crate) enum MergeResult<V: Clone> {
    Existing(V),
    New(Cell),
    Empty,
}

fn merge_rows<V: Clone>(
    existing_row: &[ExistingCell<V>],
    module_row: &[Cell],
    options: &Options,
) -> Vec<MergeResult<V>> {
    (0..cmp::max(existing_row.len(), module_row.len()))
        .map(|i| {
            merge_cell(
                existing_row.get(i).unwrap_or(&ExistingCell::Empty),
                module_row.get(i),
                options,
            )
        })
        .collect()
}

fn merge_cell<V: Clone>(
    existing: &ExistingCell<V>,
    new: Option<&Cell>,
    options: &Options,
) -> MergeResult<V> {
    if let Some(new_val) = new {
        match existing {
            ExistingCell::Value(v) => {
                // both new and existing values
                if options.overwrite_values {
                    MergeResult::New(new_val.clone())
                } else {
                    MergeResult::Existing(v.clone())
                }
            }
            ExistingCell::Empty => MergeResult::New(new_val.clone()),
        }
    } else {
        // no new value - return existing or empty
        match existing {
            ExistingCell::Value(v) => MergeResult::Existing(v.clone()),
            ExistingCell::Empty => MergeResult::Empty,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn build_options(overwrite_values: bool) -> Options {
        Options {
            overwrite_values,
            ..Default::default()
        }
    }

    #[test]
    fn merge_rows_different_lengths() {
        let options = build_options(false);
        let existing = vec![
            ExistingCell::Value(1),
            ExistingCell::Value(2),
            ExistingCell::Value(3),
        ];
        let new = vec![Cell {
            value: "new value".to_string(),
            ..Default::default()
        }];
        let merged_row = merge_rows(existing.as_slice(), &new, &options);

        assert_eq!(3, merged_row.len());
    }

    #[test]
    fn merge_rows_overwrite_false() {
        let options = build_options(false);

        assert_eq!(
            MergeResult::Empty,
            merge_cell(&ExistingCell::<usize>::Empty, None, &options)
        );

        assert_eq!(
            MergeResult::Existing(1),
            merge_cell(&ExistingCell::Value(1), None, &options)
        );

        let cell = Cell {
            value: "new value".to_string(),
            ..Default::default()
        };
        assert_eq!(
            MergeResult::Existing(1),
            merge_cell(&ExistingCell::Value(1), Some(&cell), &options)
        );
    }

    #[test]
    fn merge_cell_overwrite_true() {
        let options = build_options(true);

        assert_eq!(
            MergeResult::Empty,
            merge_cell(&ExistingCell::<usize>::Empty, None, &options)
        );

        assert_eq!(
            MergeResult::Existing(1),
            merge_cell(&ExistingCell::Value(1), None, &options)
        );

        let cell = Cell {
            value: "new value".to_string(),
            ..Default::default()
        };
        assert_eq!(
            MergeResult::New(cell.clone()),
            merge_cell(&ExistingCell::Value(1), Some(&cell), &options)
        );
    }
}