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
use crate::nodes::{Expression, Token};
/// Represents the type of operator in a unary expression.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum UnaryOperator {
/// The length operator (`#`)
Length,
/// The minus operator (`-`)
Minus,
/// The not operator (`not`)
Not,
}
impl UnaryOperator {
/// Returns the string representation of this operator.
pub fn to_str(&self) -> &'static str {
match self {
Self::Length => "#",
Self::Minus => "-",
Self::Not => "not",
}
}
}
/// Represents a unary operation applied to an expression.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct UnaryExpression {
operator: UnaryOperator,
expression: Expression,
token: Option<Token>,
}
impl UnaryExpression {
/// Creates a new unary expression with the given operator and expression.
pub fn new<E: Into<Expression>>(operator: UnaryOperator, expression: E) -> Self {
Self {
operator,
expression: expression.into(),
token: None,
}
}
/// Attaches a token to this unary expression.
pub fn with_token(mut self, token: Token) -> Self {
self.token = Some(token);
self
}
/// Sets the token for this unary expression.
#[inline]
pub fn set_token(&mut self, token: Token) {
self.token = Some(token);
}
/// Returns the token associated with this unary expression, if any.
#[inline]
pub fn get_token(&self) -> Option<&Token> {
self.token.as_ref()
}
/// Returns the expression being operated on.
#[inline]
pub fn get_expression(&self) -> &Expression {
&self.expression
}
/// Returns a mutable reference to the expression being operated on.
#[inline]
pub fn mutate_expression(&mut self) -> &mut Expression {
&mut self.expression
}
/// Returns the operator of this unary expression.
#[inline]
pub fn operator(&self) -> UnaryOperator {
self.operator
}
/// Returns a mutable reference to the last token for this unary expression,
/// creating it if missing.
pub fn mutate_last_token(&mut self) -> &mut Token {
self.expression.mutate_last_token()
}
super::impl_token_fns!(iter = [token]);
}