sphinx/parser/
operator.rs

1use core::fmt;
2
3
4// Unary Operators
5
6#[derive(Debug, Clone, Copy, PartialEq, Eq)]
7pub enum UnaryOp {
8    Neg, Pos, Inv, Not,
9}
10
11// Binary Operators
12
13#[derive(Debug, Clone, Copy, PartialEq, Eq)]
14pub enum BinaryOp {
15    // precedence level 1
16    Mul, Div, Mod,
17    
18    // precedence level 2
19    Add, Sub,
20    
21    // precedence level 3
22    LShift, RShift,
23    
24    // precedence level 4
25    BitAnd,
26    
27    // precedence level 5
28    BitXor,
29    
30    // precedence level 6
31    BitOr,
32    
33    // precedence level 7
34    LT, GT, LE, GE,
35    
36    // precedence level 8
37    EQ, NE,
38    
39    // precedence level 9
40    And,
41    
42    // precedence level 10
43    Or,
44}
45
46pub type Precedence = u8;
47pub const PRECEDENCE_END: Precedence = 0; // tightest binding
48pub const PRECEDENCE_START: Precedence = 10; // weakest binding
49
50impl BinaryOp {
51    
52    pub const fn precedence_level(&self) -> Precedence {
53        match self {
54            BinaryOp::Mul | BinaryOp::Div | BinaryOp::Mod => 1,
55            
56            BinaryOp::Add | BinaryOp::Sub => 2,
57            
58            BinaryOp::LShift | BinaryOp::RShift => 3,
59            
60            BinaryOp::BitAnd => 4,
61            BinaryOp::BitXor => 5,
62            BinaryOp::BitOr => 6,
63            
64            BinaryOp::LT | BinaryOp::GT | BinaryOp::LE | BinaryOp::GE  => 7,
65            BinaryOp::EQ | BinaryOp::NE => 8,
66            
67            BinaryOp::And => 9,
68            BinaryOp::Or => 10,
69        }
70    }
71}
72
73impl fmt::Display for BinaryOp {
74    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
75        let symbol = match self {
76            BinaryOp::Mul    => "*", 
77            BinaryOp::Div    => "/", 
78            BinaryOp::Mod    => "%",
79            BinaryOp::Add    => "+",
80            BinaryOp::Sub    => "-",
81            BinaryOp::LShift => "<<", 
82            BinaryOp::RShift => ">>",
83            BinaryOp::BitAnd => "&",
84            BinaryOp::BitXor => "^",
85            BinaryOp::BitOr  => "|",
86            BinaryOp::LT     => "<",
87            BinaryOp::GT     => ">",
88            BinaryOp::LE     => "<=",
89            BinaryOp::GE     => ">=",
90            BinaryOp::EQ     => "==",
91            BinaryOp::NE     => "!=",
92            BinaryOp::And    => "and",
93            BinaryOp::Or     => "or",
94        };
95        fmt.write_str(symbol)
96    }
97}
sphinx/parser/operator.rs

sphinx/parser/
operator.rs
