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

// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library 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.

// The Leo library 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 the Leo library. If not, see <https://www.gnu.org/licenses/>.

use crate::{AsgConvertError, ConstValue, Expression, ExpressionNode, FromAst, Node, PartialType, Scope, Span, Type};
pub use leo_ast::UnaryOperation;

use std::{
    cell::RefCell,
    sync::{Arc, Weak},
};

#[derive(Debug)]
pub struct UnaryExpression {
    pub parent: RefCell<Option<Weak<Expression>>>,
    pub span: Option<Span>,
    pub operation: UnaryOperation,
    pub inner: Arc<Expression>,
}

impl Node for UnaryExpression {
    fn span(&self) -> Option<&Span> {
        self.span.as_ref()
    }
}

impl ExpressionNode for UnaryExpression {
    fn set_parent(&self, parent: Weak<Expression>) {
        self.parent.replace(Some(parent));
    }

    fn get_parent(&self) -> Option<Arc<Expression>> {
        self.parent.borrow().as_ref().map(Weak::upgrade).flatten()
    }

    fn enforce_parents(&self, expr: &Arc<Expression>) {
        self.inner.set_parent(Arc::downgrade(expr));
    }

    fn get_type(&self) -> Option<Type> {
        self.inner.get_type()
    }

    fn is_mut_ref(&self) -> bool {
        false
    }

    fn const_value(&self) -> Option<ConstValue> {
        if let Some(inner) = self.inner.const_value() {
            match self.operation {
                UnaryOperation::Not => match inner {
                    ConstValue::Boolean(value) => Some(ConstValue::Boolean(!value)),
                    _ => None,
                },
                UnaryOperation::Negate => {
                    match inner {
                        ConstValue::Int(value) => Some(ConstValue::Int(value.value_negate()?)),
                        // ConstValue::Group(value) => Some(ConstValue::Group(value)), TODO: groups
                        // ConstValue::Field(value) => Some(ConstValue::Field(-value)),
                        _ => None,
                    }
                }
            }
        } else {
            None
        }
    }

    fn is_consty(&self) -> bool {
        self.inner.is_consty()
    }
}

impl FromAst<leo_ast::UnaryExpression> for UnaryExpression {
    fn from_ast(
        scope: &Scope,
        value: &leo_ast::UnaryExpression,
        expected_type: Option<PartialType>,
    ) -> Result<UnaryExpression, AsgConvertError> {
        let expected_type = match value.op {
            UnaryOperation::Not => match expected_type.map(|x| x.full()).flatten() {
                Some(Type::Boolean) | None => Some(Type::Boolean),
                Some(type_) => {
                    return Err(AsgConvertError::unexpected_type(
                        &type_.to_string(),
                        Some(&*Type::Boolean.to_string()),
                        &value.span,
                    ));
                }
            },
            UnaryOperation::Negate => match expected_type.map(|x| x.full()).flatten() {
                Some(type_ @ Type::Integer(_)) => Some(type_),
                Some(Type::Group) => Some(Type::Group),
                Some(Type::Field) => Some(Type::Field),
                None => None,
                Some(type_) => {
                    return Err(AsgConvertError::unexpected_type(
                        &type_.to_string(),
                        Some("integer, group, field"),
                        &value.span,
                    ));
                }
            },
        };
        Ok(UnaryExpression {
            parent: RefCell::new(None),
            span: Some(value.span.clone()),
            operation: value.op.clone(),
            inner: Arc::<Expression>::from_ast(scope, &*value.inner, expected_type.map(Into::into))?,
        })
    }
}

impl Into<leo_ast::UnaryExpression> for &UnaryExpression {
    fn into(self) -> leo_ast::UnaryExpression {
        leo_ast::UnaryExpression {
            op: self.operation.clone(),
            inner: Box::new(self.inner.as_ref().into()),
            span: self.span.clone().unwrap_or_default(),
        }
    }
}