private static void GenerateReadMethods(Endianness le, StringBuilder methods, StringBuilder extensions, bool move)
{
string CreateBody(string body, MethodData ds, string len, string move)
{
var b = body;
if (!ds.NoLengthParam && !string.IsNullOrWhiteSpace(len) && len != "length")
{
len = $"length = {len};";
}
else
{
len = "";
}
b = b.Replace("[LEN]", len);
b = b.Replace("[MOVE]", move);
return(b);
}
if (move && le == Endianness.Default)
{
Helper.Method(extensions, true, "void", "Move", "ref this Span<byte> span, int length", "span = span.Slice(length);", "");
Helper.Method(extensions, true, "void", "Move", "ref this ReadOnlySpan<byte> span, int length", "span = span.Slice(length);", "");
Helper.Method(methods, true, "void", "Move", "ref Span<byte> span, int length", "span = span.Slice(length);", "");
Helper.Method(methods, true, "void", "Move", "ref ReadOnlySpan<byte> span, int length", "span = span.Slice(length);", "");
}
// Since extension methods causes defensive copying we duplicate the code instead of forming a chain.
string methodName(string t) => (move ? "Move" : "") + $"Read{t}" + CodeGenBodies.EndiannessToMethodExtension(le);
foreach (var ds in CodeGenBodies.DataStructures)
{
if (!ds.Endian.HasFlag(le))
{
continue;
}
if (ds.RW == MethodRW.WriteOnly)
{
continue;
}
var outRef = (move ? "ref " : "");
// For "Move" we need out parameter
var cParams = $"span";
// Extra parameters in addition to span
if (!string.IsNullOrWhiteSpace(ds.ExtraReadParamsDef))
{
cParams += $", {ds.ExtraReadParamsDef}";
}
// Method name and skeleton body
var mn = methodName(ds.Name);
var body = ds.GetReadBody(le);
var moveStr = "";
if (move && !string.IsNullOrWhiteSpace(ds.Size))
{
moveStr = $"span = span.Slice({ds.Size});";
}
var fwdExtraParams = string.IsNullOrWhiteSpace(ds.ExtraReadParams) ? "" : $", {ds.ExtraReadParams}";
// Without "out var length": Compiler will optimize away assignment
if (ds.NoLengthParam)
{
// We use "length" as input parameter so we won't add any length logic to it
// Create method for ReadOnlySpan<byte>
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef}Span<byte> {cParams}", CreateBody(body, ds, "", moveStr), "");
// Alias from Span to ReadOnlySpan
if (ds.TypeString != "Span<byte>")
{
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef}ReadOnlySpan<byte> {cParams}", CreateBody(body, ds, "", moveStr), "");
}
// Extension method alias for ReadOnlySpan and Span
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this Span<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams});", "");
if (ds.TypeString != "Span<byte>")
{
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this ReadOnlySpan<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams});", "");
}
}
else
// With "out var length"
{
// Overloads ignoring "out int length" allowing compiler to optimize it away
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef} Span<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out _);", "");
if (ds.TypeString != "Span<byte>")
{
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef} ReadOnlySpan<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out _);", "");
}
// Full method
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef}Span<byte> {cParams}, out int length", CreateBody(body, ds, ds.Size, moveStr), "");
if (ds.TypeString != "Span<byte>")
{
Helper.Method(methods, true, ds.TypeString, mn, $"{outRef}ReadOnlySpan<byte> {cParams}, out int length", CreateBody(body, ds, ds.Size, moveStr), "");
}
// Extension method
// Overload for Span<byte>
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this Span<byte>{cParams}, out int length", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out length);", "");
if (ds.TypeString != "Span<byte>")
{
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this ReadOnlySpan<byte>{cParams}, out int length", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out length);", "");
}
// Overloads ignoring "out int length" allowing compiler to optimize it away
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this Span<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out _);", "");
if (ds.TypeString != "Span<byte>")
{
Helper.Method(extensions, true, ds.TypeString, mn, $"{outRef}this ReadOnlySpan<byte>{cParams}", $"SpanUtils.{mn}({outRef}span{fwdExtraParams}, out _);", "");
}
}
}
}
private static void GenReadBody(Endianness le, MethodData ds, StringBuilder sb, bool isMemoryStreamer,
bool isReadOnly)
{
if (ds.RW == MethodRW.WriteOnly)
{
return;
}
if (isReadOnly && ds.Name == "Span")
{
return;
}
var memory = isMemoryStreamer ? "Memory." : "";
List <string> pDef = new();
List <string> p = new();
var checkWriteOk = "";
// Special case for returning span, then we need to read Span only
if (ds.Name == "Span")
{
if (!isMemoryStreamer)
{
memory = "";
}
else
{
memory = "Memory.";
checkWriteOk = @"
if (!CanWrite)
throw new ReadOnlyException(""Span is read-only, use ReadReadOnlySpan."");";
}
}
var name = "Read" + ds.Name + CodeGenBodies.EndiannessToMethodExtension(le);
if (!string.IsNullOrWhiteSpace(ds.ExtraReadParamsDef))
{
pDef.Add(ds.ExtraReadParamsDef);
}
if (!string.IsNullOrWhiteSpace(ds.ExtraReadParams))
{
p.Add(ds.ExtraReadParams);
}
var retType = ds.TypeString;
if (isMemoryStreamer && ds.Endian == Endianness.Default &&
ds.TypeString == typeof(byte).Name && ds.Name == typeof(byte).Name)
{
retType = "override int";
}
if (!ds.NoLengthParam)
{
var pC = new List <string>(p);
pC.Add("out _");
Helper.Method(sb, false, retType, $"{name}", Sj(pDef), $"{name}({Sj(pC)});", "");
pDef.Add("out int length");
p.Add("out length");
}
Helper.Method(sb, false, ds.TypeString, $"{name}", Sj(pDef), @$ "{checkWriteOk}
var ret = SpanUtils.{name}({memory}Span.Slice(_position), {Sj(p)});
private static void GenerateWriteMethods(Endianness le, StringBuilder methods, StringBuilder extensions, bool move)
{
string CreateBody(string body, MethodData ds, string len, string move)
{
var b = body;
if (!ds.NoLengthParam && !string.IsNullOrWhiteSpace(len) && len != "length")
{
len = $"length = {len};";
}
else
{
len = "";
}
b = b.Replace("[LEN]", len);
b = b.Replace("[MOVE]", move);
return(b);
}
// Since extension methods causes defensive copying we duplicate the code instead of forming a chain.
string methodName(string t) => (move ? "Move" : "") + $"Write{t}" + CodeGenBodies.EndiannessToMethodExtension(le);
foreach (var ds in CodeGenBodies.DataStructures)
{
if (!ds.Endian.HasFlag(le))
{
continue;
}
// We skip aliases
if (ds.IsAlias || ds.RW == MethodRW.ReadOnly)
{
continue;
}
var outRef = (move ? "ref " : "");
// For "Move" we need out parameter
var cParams = $"span, {ds.TypeString} value";
// Method name and skeleton body
var mn = methodName(ds.WriteName);
var body = ds.GetWriteBody(le);
var moveStr = "";
if (move && !string.IsNullOrWhiteSpace(ds.Size))
{
moveStr = $"span = span.Slice({ds.Size});";
}
{
// Overloads ignoring "out int length" allowing compiler to optimize it away
Helper.Method(methods, true, "void", mn, $"{outRef}Span<byte>{cParams}", $"SpanUtils.{mn}({outRef}span, value, out _);", "");
// Full method
Helper.Method(methods, true, "void", mn, $"{outRef}Span<byte>{cParams}, out int length", CreateBody(body, ds, ds.Size, moveStr), "");
// Extension method
// Overload for Span<byte>
Helper.Method(extensions, true, "void", mn, $"{outRef}this Span<byte>{cParams}, out int length", $"SpanUtils.{mn}({outRef}span, value, out length);", "");
// Overloads ignoring "out int length" allowing compiler to optimize it away
Helper.Method(extensions, true, "void", mn, $"{outRef}this Span<byte>{cParams}", $"SpanUtils.{mn}({outRef}span, value, out _);", "");
}
}
}