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Compatibility w/ C# versions below 8 #83

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Compatibility w/ C# versions below 8 #83

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91 changes: 48 additions & 43 deletions Generator/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,25 +6,25 @@
using System;
using System.Collections.Generic;

var sourceRoot = GetFullPath(Combine(GetDirectoryName(GetExecutingAssembly().Location)!, @"..\..\..\.."));
var sourceRoot = GetFullPath(Combine(GetDirectoryName(GetExecutingAssembly().Location)!, $"..{Path.DirectorySeparatorChar}..{Path.DirectorySeparatorChar}..{Path.DirectorySeparatorChar}.."));

for (var i = 1; i < 10; i++) {
var output = GetContent(true, i);
var outpath = Combine(sourceRoot, $"OneOf\\OneOfT{i - 1}.generated.cs");
var outpath = Combine(sourceRoot, $"OneOf{Path.DirectorySeparatorChar}OneOfT{i - 1}.generated.cs");
File.WriteAllText(outpath, output);

var output2 = GetContent(false, i);
var outpath2 = Combine(sourceRoot, $"OneOf\\OneOfBaseT{i - 1}.generated.cs");
var outpath2 = Combine(sourceRoot, $"OneOf{Path.DirectorySeparatorChar}OneOfBaseT{i - 1}.generated.cs");
File.WriteAllText(outpath2, output2);
}

for (var i = 10; i < 33; i++) {
var output3 = GetContent(true, i);
var outpath3 = Combine(sourceRoot, $"OneOf.Extended\\OneOfT{i - 1}.generated.cs");
var outpath3 = Combine(sourceRoot, $"OneOf.Extended{Path.DirectorySeparatorChar}OneOfT{i - 1}.generated.cs");
File.WriteAllText(outpath3, output3);

var output4 = GetContent(false, i);
var outpath4 = Combine(sourceRoot, $"OneOf.Extended\\OneOfBaseT{i - 1}.generated.cs");
var outpath4 = Combine(sourceRoot, $"OneOf.Extended{Path.DirectorySeparatorChar}OneOfBaseT{i - 1}.generated.cs");
File.WriteAllText(outpath4, output4);
}

Expand Down Expand Up @@ -67,13 +67,14 @@ namespace OneOf
}}"
)}

public object Value =>
_index switch
{{
{RangeJoined(@"
", j => $"{j} => _value{j},")}
_ => throw new InvalidOperationException()
}};
public object Value {{ get {{
switch (_index)
{{
{RangeJoined(@"
", j => $"case {j}: return _value{j};")}
default: throw new InvalidOperationException();
}}
}} }}

public int Index => _index;

Expand Down Expand Up @@ -125,15 +126,15 @@ public TResult Match<TResult>({RangeJoined(", ", e => $"Func<T{e}, TResult> f{e}
{{
throw new ArgumentNullException(nameof(mapFunc));
}}
return _index switch
switch (_index)
{{
{genericArgs.Joined(@"
", (x, k) =>
x == bindToType ?
$"{k} => mapFunc(As{x})," :
$"{k} => As{x},")}
_ => throw new InvalidOperationException()
}};
$"case {k}: return mapFunc(As{x});" :
$"case {k}: return As{x};")}
default: throw new InvalidOperationException();
}}
}}";
}))}
");
Expand All @@ -145,33 +146,35 @@ public TResult Match<TResult>({RangeJoined(", ", e => $"Func<T{e}, TResult> f{e}
var genericArgWithSkip = Range(0, i).ExceptSingle(j).Joined(", ", e => $"T{e}");
var remainderType = i == 2 ? genericArgWithSkip : $"OneOf<{genericArgWithSkip}>";
return $@"
public bool TryPickT{j}(out T{j} value, out {remainderType} remainder)
{{
value = IsT{j} ? AsT{j} : default;
remainder = _index switch
public bool TryPickT{j}(out T{j} value, out {remainderType} remainder)
{{
value = IsT{j} ? AsT{j} : default;
switch (_index)
{{
{RangeJoined(@"
", k =>
", k =>
k == j ?
$"{k} => default," :
$"{k} => AsT{k},")}
_ => throw new InvalidOperationException()
}};
return this.IsT{j};
}}";
$"case {k}: {{ remainder = default; break; }}" :
$"case {k}: {{ remainder = AsT{k}; break; }}")}
default: throw new InvalidOperationException();
}}
return this.IsT{j};
}}";
})
);
}

sb.AppendLine($@"
bool Equals({className}<{genericArg}> other) =>
_index == other._index &&
_index switch
bool Equals({className}<{genericArg}> other) {{
var check1 = _index == other._index;
if (!check1) {{ return false; }}
switch (_index)
{{
{RangeJoined(@"
", j => @$"{j} => Equals(_value{j}, other._value{j}),")}
_ => false
", j => @$"case {j}: return check1 && Equals(_value{j}, other._value{j});")}
default: return false;
}};
}}

public override bool Equals(object obj)
{{
Expand All @@ -190,23 +193,25 @@ public override bool Equals(object obj)
)}
}}

public override string ToString() =>
_index switch {{
public override string ToString() {{
switch (_index) {{
{RangeJoined(@"
", j => $"{j} => FormatValue(_value{j}),")}
_ => throw new InvalidOperationException(""Unexpected index, which indicates a problem in the OneOf codegen."")
}};
", j => $"case {j}: return FormatValue(_value{j});")}
default: throw new InvalidOperationException(""Unexpected index, which indicates a problem in the OneOf codegen."");
}}
}}

public override int GetHashCode()
{{
unchecked
{{
int hashCode = _index switch
int hashCode;
switch (_index)
{{
{RangeJoined(@"
", j => $"{j} => _value{j}?.GetHashCode(),")}
_ => 0
}} ?? 0;
", j => $"case {j}: {{ hashCode = _value{j}?.GetHashCode() ?? 0; break; }}")}
default: {{ hashCode = 0; break; }}
}}
return (hashCode*397) ^ _index;
}}
}}
Expand All @@ -228,4 +233,4 @@ public static string Joined<T>(this IEnumerable<T> source, string delimiter, Fun
}
public static IEnumerable<T> ExceptSingle<T>(this IEnumerable<T> source, T single) => source.Except(Repeat(single, 1));
public static void AppendLineTo(this string? s, StringBuilder sb) => sb.AppendLine(s);
}
}
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