csvpp 0.4.1

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

//! # BuiltinFunction
//!
use super::{Ast, FunctionEval, FunctionName, Node};
use crate::error::{EvalError, EvalResult};
use std::collections;
use std::fmt;
use std::str::FromStr;

pub(crate) struct BuiltinFunction {
    pub(crate) eval: FunctionEval,
    pub(crate) name: FunctionName,
}

impl BuiltinFunction {
    pub fn all() -> collections::HashMap<FunctionName, BuiltinFunction> {
        let mut fns = collections::HashMap::new();

        // A reference to a cell above this row
        fns = def_fn(fns, "cellabove", |current, args| {
            let column = verify_one_column("cellabove", args, current)?;
            Ok(current.shift_up(1).with_x(column.x).into())
        });

        // A reference to a cell below this row
        fns = def_fn(fns, "cellbelow", |current, args| {
            let column = verify_one_column("cellbelow", args, current)?;
            Ok(current.shift_down(1).with_x(column.x).into())
        });

        // A reference to a cell in the current row
        fns = def_fn(fns, "celladjacent", |current, args| {
            let column = verify_one_column("celladjacent", args, current)?;
            Ok(current.with_x(column.x).into())
        });

        fns
    }
}

// NOTE: Debug is manually implemented because we can't derive it for `eval`.
impl fmt::Debug for BuiltinFunction {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("BuiltinFunction")
            .field("name", &self.name)
            .finish_non_exhaustive()
    }
}

fn def_fn<F, S>(
    mut fns: collections::HashMap<String, BuiltinFunction>,
    name: S,
    eval_fn: F,
) -> collections::HashMap<FunctionName, BuiltinFunction>
where
    F: Fn(a1_notation::Address, &[Ast]) -> EvalResult<Node> + 'static,
    S: Into<String> + Clone,
{
    fns.insert(
        name.clone().into(),
        BuiltinFunction {
            name: name.into(),
            eval: Box::new(move |current, args| eval_fn(current, args)),
        },
    );

    fns
}

fn verify_one_column(
    fn_name: &str,
    args: &[Ast],
    position: a1_notation::Address,
) -> EvalResult<a1_notation::Column> {
    if args.len() != 1 {
        Err(EvalError::new(
            position,
            format!("Expected a single argument to `{fn_name}`"),
        ))
    } else if let Node::Reference(r) = &*args[0] {
        Ok(a1_notation::Column::from_str(r).map_err(|e| {
            EvalError::new(
                position,
                format!("Expected an A1 reference as the first argument: {e}"),
            )
        })?)
    } else {
        Err(EvalError::new(
            position,
            format!("Expected a cell reference as the only argumnent to `{fn_name}`"),
        ))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use a1_notation::Address;

    #[test]
    fn all_cellabove() {
        let fns = BuiltinFunction::all();
        let current = Address::new(0, 1);
        let cellabove = fns.get("cellabove").unwrap();

        assert_eq!(
            (cellabove.eval)(current, &[Box::new(Node::reference("C"))]).unwrap(),
            Node::reference("C1")
        );
    }

    #[test]
    fn all_celladjacent() {
        let fns = BuiltinFunction::all();
        let current = Address::new(0, 1);
        let celladjacent = fns.get("celladjacent").unwrap();

        assert_eq!(
            (celladjacent.eval)(current, &[Box::new(Node::reference("C"))]).unwrap(),
            Node::reference("C2")
        );
    }

    #[test]
    fn all_cellbelow() {
        let fns = BuiltinFunction::all();
        let current = Address::new(0, 1);
        let cellbelow = fns.get("cellbelow").unwrap();

        assert_eq!(
            (cellbelow.eval)(current, &[Box::new(Node::reference("C"))]).unwrap(),
            Node::reference("C3")
        );
    }
}