tract_data/dim/
parse.rs

1use super::*;
2use nom::branch::alt;
3use nom::bytes::complete::tag;
4use nom::character::complete::{alpha1, alphanumeric1, digit1, one_of};
5use nom::combinator::{all_consuming, map, map_res, recognize};
6use nom::multi::{fold, many0, separated_list0};
7use nom::sequence::{delimited, pair, preceded, separated_pair};
8use nom::{IResult, Parser};
9use nom_language::error::VerboseError;
10
11type R<'i, O> = IResult<&'i str, O, VerboseError<&'i str>>;
12
13pub fn parse_tdim(symbol_table: &SymbolScope, input: &str) -> TractResult<TDim> {
14    match all_consuming(|i| expr(symbol_table, i)).parse(input) {
15        Ok(pair) => Ok(pair.1),
16        Err(e) => bail!("Failed to parse {:?}, {:?}", input, e),
17    }
18}
19
20pub fn parse_assertion(symbol_table: &SymbolScope, input: &str) -> TractResult<Assertion> {
21    match all_consuming(|i| assertion(symbol_table, i)).parse(input) {
22        Ok(pair) => Ok(pair.1),
23        Err(e) => bail!("Failed to parse {:?}, {:?}", input, e),
24    }
25}
26
27fn assertion<'i>(s: &SymbolScope, i: &'i str) -> R<'i, Assertion> {
28    delimited(
29        spaces,
30        alt((
31            map(separated_pair(|i| expr(s, i), stag("=="), |i| expr(s, i)), |(a, b)| {
32                Assertion::Eq(a, b)
33            }),
34            map(separated_pair(|i| expr(s, i), stag("<="), |i| expr(s, i)), |(a, b)| {
35                Assertion::LTE(a, b)
36            }),
37            map(separated_pair(|i| expr(s, i), stag(">="), |i| expr(s, i)), |(a, b)| {
38                Assertion::GTE(a, b)
39            }),
40            map(separated_pair(|i| expr(s, i), stag("<"), |i| expr(s, i)), |(a, b)| {
41                Assertion::LT(a, b)
42            }),
43            map(separated_pair(|i| expr(s, i), stag(">"), |i| expr(s, i)), |(a, b)| {
44                Assertion::GT(a, b)
45            }),
46        )),
47        spaces,
48    )
49    .parse(i)
50}
51
52fn expr<'i>(symbol_table: &SymbolScope, i: &'i str) -> R<'i, TDim> {
53    broadcast(symbol_table, i)
54}
55
56fn broadcast<'i>(symbol_table: &SymbolScope, input: &'i str) -> R<'i, TDim> {
57    let s = symbol_table;
58    let (mut input, mut result) = add(s, input)?;
59    while let Ok((i, _)) = stag("#").parse(input) {
60        let (i, next) = map_res(|i| add(s, i), |v| result.clone().broadcast(v)).parse(i)?;
61        (input, result) = (i, next);
62    }
63    Ok((input, result))
64}
65
66macro_rules! bin {
67    ($name: ident, $left: expr, $right: expr, $op: expr, $builder: expr) => {
68        fn $name<'i>(symbol_table: &SymbolScope, input: &'i str) -> R<'i, TDim> {
69            let s = symbol_table;
70            let (input, result) = $left(s, input)?;
71            fold(0.., preceded(stag($op), |i| $right(s, i)), move || result.clone(), $builder)
72                .parse(input)
73        }
74    };
75}
76
77bin!(add, sub, sub, "+", |a, b| a + b);
78bin!(sub, mul, mul, "-", |a, b| a - b);
79bin!(mul, div, div, "*", |a, b| a * b);
80bin!(div, atom, |_s, i| numeric(i), "/", |a, b| a / b);
81
82fn atom<'i>(symbol_table: &SymbolScope, i: &'i str) -> R<'i, TDim> {
83    alt((
84        map(numeric, TDim::Val),
85        map(|i| func(symbol_table, "min", i), TDim::Min),
86        map(|i| func(symbol_table, "max", i), TDim::Max),
87        map(|i| func(symbol_table, "floor", i), |xs| xs[0].clone()),
88        map(|i| identifier(symbol_table, i), TDim::Sym),
89        map(pair(recognize(stag("-")), |i| atom(symbol_table, i)), |(_, dim)| dim * -1),
90        delimited(stag("("), |i| expr(symbol_table, i), stag(")")),
91    ))
92    .parse(i)
93}
94
95fn func<'i>(symbol_table: &SymbolScope, name: &'static str, i: &'i str) -> R<'i, Vec<TDim>> {
96    preceded(
97        stag(name),
98        delimited(stag("("), separated_list0(stag(","), |i| expr(symbol_table, i)), stag(")")),
99    )
100    .parse(i)
101}
102
103fn identifier<'i>(symbol_table: &SymbolScope, i: &'i str) -> R<'i, Symbol> {
104    map(
105        recognize(pair(alt((alpha1, tag("_"))), many0(alt((alphanumeric1, tag("_"), tag(".")))))),
106        |s| symbol_table.sym(s),
107    )
108    .parse(i)
109}
110
111fn numeric(i: &str) -> R<'_, i64> {
112    map_res(digit1, std::str::FromStr::from_str).parse(i)
113}
114
115fn spaces(i: &str) -> R<'_, ()> {
116    map(many0(one_of(" \t\n\r")), |_| ()).parse(i)
117}
118
119fn spaced<'s, O, P>(it: P) -> impl Parser<&'s str, Output = O, Error = VerboseError<&'s str>>
120where
121    P: Parser<&'s str, Output = O, Error = VerboseError<&'s str>>,
122{
123    delimited(spaces, it, spaces)
124}
125
126pub(super) fn stag<'s>(
127    t: &'static str,
128) -> impl Parser<&'s str, Output = &'s str, Error = VerboseError<&'s str>> {
129    spaced(tag(t))
130}
131
132#[cfg(test)]
133mod test {
134    use super::*;
135
136    #[test]
137    fn parse_int() {
138        let table = SymbolScope::default();
139        assert_eq!(parse_tdim(&table, "12").unwrap(), TDim::Val(12));
140        assert_eq!(parse_tdim(&table, "-12").unwrap(), TDim::Val(-12));
141    }
142
143    #[test]
144    fn parse_sym() {
145        let table = SymbolScope::default();
146        assert_eq!(parse_tdim(&table, "x").unwrap(), TDim::Sym(table.sym("x")));
147        assert_eq!(
148            parse_tdim(&table, "-y").unwrap(),
149            TDim::MulInt(-1, Box::new(table.sym("y").into()))
150        );
151    }
152
153    #[test]
154    fn parse_bin() {
155        let table = SymbolScope::default();
156        assert_eq!(parse_tdim(&table, "1+2").unwrap(), 3.into());
157        assert_eq!(parse_tdim(&table, "1-2").unwrap(), (-1).into());
158        assert_eq!(parse_tdim(&table, "1*2").unwrap(), 2.into());
159        assert_eq!(parse_tdim(&table, "1/2").unwrap(), 0.into());
160    }
161
162    #[test]
163    fn parse_prio() {
164        let table = SymbolScope::default();
165        assert_eq!(parse_tdim(&table, "1+2*3").unwrap(), 7.into());
166        assert_eq!(parse_tdim(&table, "1*2+3").unwrap(), 5.into());
167    }
168
169    #[test]
170    fn parse_min() {
171        let table = SymbolScope::default();
172        assert_eq!(
173            parse_tdim(&table, "min(P,S)").unwrap(),
174            TDim::Min(vec!(table.sym("P").into(), table.sym("S").into()))
175        );
176    }
177
178    #[test]
179    fn parse_inequality_0() {
180        let table = SymbolScope::default();
181        assert_eq!(
182            parse_assertion(&table, "P+S<4096").unwrap(),
183            Assertion::LT(parse_tdim(&table, "P+S").unwrap(), 4096.to_dim())
184        );
185    }
186
187    #[test]
188    fn parse_dot_ids() {
189        let table = SymbolScope::default();
190        assert_eq!(parse_tdim(&table, "dot.0").unwrap(), table.sym("dot.0").into());
191    }
192
193    #[test]
194    fn parse_dot_ids_arith() {
195        let table = SymbolScope::default();
196        assert_eq!(parse_tdim(&table, "dot.0/2").unwrap(), table.sym("dot.0").to_dim() / 2);
197    }
198
199    #[test]
200    fn parse_floors() {
201        let table = SymbolScope::default();
202        assert_eq!(parse_tdim(&table, "floor(a)").unwrap(), table.sym("a").to_dim());
203    }
204}
tract_data/dim/parse.rs

tract_data/dim/
parse.rs
