leo_grammar/common/
variables.rs

1// Copyright (C) 2019-2020 Aleo Systems Inc.
2// This file is part of the Leo library.
3
4// The Leo library is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8
9// The Leo library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License
15// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
16
17use crate::{ast::Rule, common::VariableName, types::Type, SpanDef};
18
19use pest::Span;
20use pest_ast::FromPest;
21use serde::Serialize;
22use std::fmt;
23
24#[derive(Clone, Debug, FromPest, PartialEq, Serialize)]
25#[pest_ast(rule(Rule::variables))]
26pub struct Variables<'ast> {
27    pub names: Vec<VariableName<'ast>>,
28    pub type_: Option<Type<'ast>>,
29    #[pest_ast(outer())]
30    #[serde(with = "SpanDef")]
31    pub span: Span<'ast>,
32}
33
34impl<'ast> fmt::Display for Variables<'ast> {
35    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
36        if self.names.len() == 1 {
37            // mut a
38            write!(f, "{}", self.names[0])?;
39        } else {
40            // (a, mut b)
41            let names = self.names.iter().map(|x| x.to_string()).collect::<Vec<_>>().join(",");
42
43            write!(f, "({})", names)?;
44        }
45
46        if self.type_.is_some() {
47            write!(f, ": {}", self.type_.as_ref().unwrap())?;
48        }
49
50        write!(f, "")
51    }
52}
leo_grammar/common/variables.rs

leo_grammar/common/
variables.rs
