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
|
// <file>
// <copyright see="prj:///doc/copyright.txt"/>
// <license see="prj:///doc/license.txt"/>
// <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
// <version>$Revision: 2644$</version>
// </file>
using System;
using System.Collections.Generic;
using ICSharpCode.NRefactory.Ast;
namespace ICSharpCode.NRefactory
{
/// <summary>
/// Stores the operator precedences for the output visitor.
/// </summary>
static class OperatorPrecedence
{
static readonly Dictionary<BinaryOperatorType, int> vbDict = MakePrecedenceTable(
new BinaryOperatorType[] { BinaryOperatorType.Power },
new BinaryOperatorType[] { BinaryOperatorType.Multiply, BinaryOperatorType.Divide },
new BinaryOperatorType[] { BinaryOperatorType.DivideInteger },
new BinaryOperatorType[] { BinaryOperatorType.Modulus },
new BinaryOperatorType[] { BinaryOperatorType.Add, BinaryOperatorType.Subtract },
new BinaryOperatorType[] { BinaryOperatorType.Concat },
new BinaryOperatorType[] { BinaryOperatorType.ShiftLeft, BinaryOperatorType.ShiftRight },
new BinaryOperatorType[] {
BinaryOperatorType.Equality, BinaryOperatorType.InEquality,
BinaryOperatorType.LessThan, BinaryOperatorType.LessThanOrEqual,
BinaryOperatorType.GreaterThan, BinaryOperatorType.GreaterThanOrEqual,
BinaryOperatorType.ReferenceEquality, BinaryOperatorType.ReferenceInequality,
BinaryOperatorType.Like
},
new BinaryOperatorType[] { BinaryOperatorType.LogicalAnd, BinaryOperatorType.BitwiseAnd },
new BinaryOperatorType[] { BinaryOperatorType.LogicalOr, BinaryOperatorType.BitwiseOr },
new BinaryOperatorType[] { BinaryOperatorType.ExclusiveOr }
);
static readonly Dictionary<BinaryOperatorType, int> csharpDict = MakePrecedenceTable(
new BinaryOperatorType[] { BinaryOperatorType.Multiply, BinaryOperatorType.Divide, BinaryOperatorType.Modulus },
new BinaryOperatorType[] { BinaryOperatorType.Add, BinaryOperatorType.Subtract },
new BinaryOperatorType[] { BinaryOperatorType.ShiftLeft, BinaryOperatorType.ShiftRight },
new BinaryOperatorType[] {
BinaryOperatorType.LessThan, BinaryOperatorType.LessThanOrEqual,
BinaryOperatorType.GreaterThan, BinaryOperatorType.GreaterThanOrEqual,
},
new BinaryOperatorType[] { BinaryOperatorType.Equality, BinaryOperatorType.InEquality },
new BinaryOperatorType[] { BinaryOperatorType.BitwiseAnd },
new BinaryOperatorType[] { BinaryOperatorType.ExclusiveOr },
new BinaryOperatorType[] { BinaryOperatorType.BitwiseOr },
new BinaryOperatorType[] { BinaryOperatorType.LogicalAnd, BinaryOperatorType.LogicalOr },
new BinaryOperatorType[] { BinaryOperatorType.NullCoalescing }
);
// create a dictionary operator->precedence (higher value = higher precedence)
static Dictionary<BinaryOperatorType, int> MakePrecedenceTable(params BinaryOperatorType[][] input)
{
Dictionary<BinaryOperatorType, int> dict = new Dictionary<BinaryOperatorType, int>();
for (int i = 0; i < input.Length; i++) {
foreach (BinaryOperatorType op in input[i]) {
dict.Add(op, input.Length - i);
}
}
return dict;
}
public static int ComparePrecedenceVB(BinaryOperatorType op1, BinaryOperatorType op2)
{
int p1 = GetOperatorPrecedence(vbDict, op1);
int p2 = GetOperatorPrecedence(vbDict, op2);
return p1.CompareTo(p2);
}
public static int ComparePrecedenceCSharp(BinaryOperatorType op1, BinaryOperatorType op2)
{
int p1 = GetOperatorPrecedence(csharpDict, op1);
int p2 = GetOperatorPrecedence(csharpDict, op2);
return p1.CompareTo(p2);
}
static int GetOperatorPrecedence(Dictionary<BinaryOperatorType, int> dict, BinaryOperatorType op)
{
int p;
dict.TryGetValue(op, out p);
return p;
}
}
}
|
