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| 1 | +using System.Text.RegularExpressions; |
| 2 | +using Microsoft.CodeAnalysis; |
| 3 | + |
| 4 | +namespace Semmle.Extraction.CSharp.Util |
| 5 | +{ |
| 6 | + public static partial class SymbolExtensions |
| 7 | + { |
| 8 | + /// <summary> |
| 9 | + /// Gets the name of this symbol. |
| 10 | + /// |
| 11 | + /// If the symbol implements an explicit interface, only the |
| 12 | + /// name of the member being implemented is included, not the |
| 13 | + /// explicit prefix. |
| 14 | + /// </summary> |
| 15 | + public static string GetName(this ISymbol symbol, bool useMetadataName = false) |
| 16 | + { |
| 17 | + var name = useMetadataName ? symbol.MetadataName : symbol.Name; |
| 18 | + return symbol.CanBeReferencedByName ? name : name.Substring(symbol.Name.LastIndexOf('.') + 1); |
| 19 | + } |
| 20 | + |
| 21 | + /// <summary> |
| 22 | + /// Convert an operator method name in to a symbolic name. |
| 23 | + /// A return value indicates whether the conversion succeeded. |
| 24 | + /// </summary> |
| 25 | + public static bool TryGetOperatorSymbol(this ISymbol symbol, out string operatorName) |
| 26 | + { |
| 27 | + static bool TryGetOperatorSymbolFromName(string methodName, out string operatorName) |
| 28 | + { |
| 29 | + var success = true; |
| 30 | + switch (methodName) |
| 31 | + { |
| 32 | + case "op_LogicalNot": |
| 33 | + operatorName = "!"; |
| 34 | + break; |
| 35 | + case "op_BitwiseAnd": |
| 36 | + operatorName = "&"; |
| 37 | + break; |
| 38 | + case "op_Equality": |
| 39 | + operatorName = "=="; |
| 40 | + break; |
| 41 | + case "op_Inequality": |
| 42 | + operatorName = "!="; |
| 43 | + break; |
| 44 | + case "op_UnaryPlus": |
| 45 | + case "op_Addition": |
| 46 | + operatorName = "+"; |
| 47 | + break; |
| 48 | + case "op_UnaryNegation": |
| 49 | + case "op_Subtraction": |
| 50 | + operatorName = "-"; |
| 51 | + break; |
| 52 | + case "op_Multiply": |
| 53 | + operatorName = "*"; |
| 54 | + break; |
| 55 | + case "op_Division": |
| 56 | + operatorName = "/"; |
| 57 | + break; |
| 58 | + case "op_Modulus": |
| 59 | + operatorName = "%"; |
| 60 | + break; |
| 61 | + case "op_GreaterThan": |
| 62 | + operatorName = ">"; |
| 63 | + break; |
| 64 | + case "op_GreaterThanOrEqual": |
| 65 | + operatorName = ">="; |
| 66 | + break; |
| 67 | + case "op_LessThan": |
| 68 | + operatorName = "<"; |
| 69 | + break; |
| 70 | + case "op_LessThanOrEqual": |
| 71 | + operatorName = "<="; |
| 72 | + break; |
| 73 | + case "op_Decrement": |
| 74 | + operatorName = "--"; |
| 75 | + break; |
| 76 | + case "op_Increment": |
| 77 | + operatorName = "++"; |
| 78 | + break; |
| 79 | + case "op_Implicit": |
| 80 | + operatorName = "implicit conversion"; |
| 81 | + break; |
| 82 | + case "op_Explicit": |
| 83 | + operatorName = "explicit conversion"; |
| 84 | + break; |
| 85 | + case "op_OnesComplement": |
| 86 | + operatorName = "~"; |
| 87 | + break; |
| 88 | + case "op_RightShift": |
| 89 | + operatorName = ">>"; |
| 90 | + break; |
| 91 | + case "op_UnsignedRightShift": |
| 92 | + operatorName = ">>>"; |
| 93 | + break; |
| 94 | + case "op_LeftShift": |
| 95 | + operatorName = "<<"; |
| 96 | + break; |
| 97 | + case "op_BitwiseOr": |
| 98 | + operatorName = "|"; |
| 99 | + break; |
| 100 | + case "op_ExclusiveOr": |
| 101 | + operatorName = "^"; |
| 102 | + break; |
| 103 | + case "op_True": |
| 104 | + operatorName = "true"; |
| 105 | + break; |
| 106 | + case "op_False": |
| 107 | + operatorName = "false"; |
| 108 | + break; |
| 109 | + default: |
| 110 | + var match = CheckedRegex().Match(methodName); |
| 111 | + if (match.Success) |
| 112 | + { |
| 113 | + TryGetOperatorSymbolFromName("op_" + match.Groups[1], out var uncheckedName); |
| 114 | + operatorName = "checked " + uncheckedName; |
| 115 | + break; |
| 116 | + } |
| 117 | + operatorName = methodName; |
| 118 | + success = false; |
| 119 | + break; |
| 120 | + } |
| 121 | + return success; |
| 122 | + } |
| 123 | + |
| 124 | + var methodName = symbol.GetName(useMetadataName: false); |
| 125 | + return TryGetOperatorSymbolFromName(methodName, out operatorName); |
| 126 | + } |
| 127 | + |
| 128 | + [GeneratedRegex("^op_Checked(.*)$")] |
| 129 | + private static partial Regex CheckedRegex(); |
| 130 | + } |
| 131 | +} |
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