static MethodDeclarationSyntax MakeMapFunction(
SyntaxToken applyToIdentifier,
SyntaxList <TypeParameterConstraintClauseSyntax> applyToConstraints,
MethodDeclarationSyntax[] applyToMembers,
TypeParameterListSyntax applyToTypeParams,
MethodDeclarationSyntax pure)
{
var genA = applyToTypeParams.Parameters.First().ToString();
var genB = CodeGenUtil.NextGenName(genA);
var genC = CodeGenUtil.NextGenName(genB);
var typeA = MakeTypeName(applyToIdentifier.Text, genA);
var typeB = MakeTypeName(applyToIdentifier.Text, genB);
var typeC = MakeTypeName(applyToIdentifier.Text, genC);
var mapFuncType = ParseTypeName($"System.Func<{genA}, {genB}>");
var pureTypeA = MakeTypeName(pure.Identifier.Text, genA);
var pureTypeB = MakeTypeName(pure.Identifier.Text, genB);
var mapFunc = InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("v"),
IdentifierName("Next")))
.WithArgumentList(ArgumentList(SingletonSeparatedList <ArgumentSyntax>(Argument(IdentifierName("n"))))),
IdentifierName("Map")))
.WithArgumentList(
ArgumentList(
SingletonSeparatedList <ArgumentSyntax>(
Argument(
IdentifierName("f")))));
var pureFunc =
new SyntaxNodeOrToken[]
{
SwitchExpressionArm(
DeclarationPattern(
pureTypeA,
SingleVariableDesignation(Identifier("v"))),
ObjectCreationExpression(pureTypeB)
.WithArgumentList(
ArgumentList(
SingletonSeparatedList <ArgumentSyntax>(
Argument(
InvocationExpression(IdentifierName("f"))
.WithArgumentList(
ArgumentList(
SingletonSeparatedList <ArgumentSyntax>(
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("v"),
IdentifierName(CodeGenUtil.MakeFirstCharUpper(pure.ParameterList.Parameters.First().Identifier.Text)))))))))))),
Token(SyntaxKind.CommaToken)
};
var termimalFuncs = applyToMembers
.Where(m => m != pure && m.AttributeLists != null && m.AttributeLists.SelectMany(a => a.Attributes).Any(a => a.Name.ToString() == "Pure"))
.SelectMany(m =>
new SyntaxNodeOrToken[]
{
SwitchExpressionArm(
DeclarationPattern(
ParseTypeName($"{m.Identifier.Text}<{genA}>"),
SingleVariableDesignation(Identifier("v"))),
ObjectCreationExpression(MakeTypeName(m.Identifier.Text, genB))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
m.ParameterList
.Parameters
.Select(p =>
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("v"),
IdentifierName(CodeGenUtil.MakeFirstCharUpper(p.Identifier))))))))),
Token(SyntaxKind.CommaToken)
});
var freeFuncs = applyToMembers
.Where(m => m.AttributeLists == null || !m.AttributeLists.SelectMany(a => a.Attributes).Any(a => a.Name.ToString() == "Pure"))
.SelectMany(m =>
new SyntaxNodeOrToken[]
{
SwitchExpressionArm(
DeclarationPattern(
ParseTypeName($"{m.Identifier.Text}<{genA}>"),
SingleVariableDesignation(Identifier("v"))),
ObjectCreationExpression(MakeTypeName(m.Identifier.Text, genB))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
Enumerable.Concat(
m.ParameterList
.Parameters
.Take(m.ParameterList.Parameters.Count - 1)
.SelectMany(p =>
new SyntaxNodeOrToken[] {
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("v"),
IdentifierName(CodeGenUtil.MakeFirstCharUpper(p.Identifier.Text)))),
Token(SyntaxKind.CommaToken)
}),
new SyntaxNodeOrToken [1] {
Argument(SimpleLambdaExpression(Parameter(Identifier("n")), mapFunc))
}))))),
Token(SyntaxKind.CommaToken)
});
var tokens = new List <SyntaxNodeOrToken>();
tokens.AddRange(pureFunc);
tokens.AddRange(termimalFuncs);
tokens.AddRange(freeFuncs);
tokens.Add(
SwitchExpressionArm(
DiscardPattern(),
ThrowExpression(
ObjectCreationExpression(
QualifiedName(
IdentifierName("System"),
IdentifierName("NotSupportedException")))
.WithArgumentList(ArgumentList()))));
return(MethodDeclaration(typeB, Identifier("Map"))
.WithModifiers(
TokenList(new[] { Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.StaticKeyword) }))
.WithTypeParameterList(
TypeParameterList(
SeparatedList <TypeParameterSyntax>(
new SyntaxNodeOrToken[]
{
TypeParameter(
Identifier(genA)),
Token(SyntaxKind.CommaToken), TypeParameter(
Identifier(genB))
})))
.WithParameterList(
ParameterList(
SeparatedList <ParameterSyntax>(
new SyntaxNodeOrToken[]
{
Parameter(
Identifier("ma"))
.WithModifiers(
TokenList(
Token(SyntaxKind.ThisKeyword)))
.WithType(typeA),
Token(SyntaxKind.CommaToken), Parameter(
Identifier("f"))
.WithType(mapFuncType)
})))
.WithExpressionBody(
ArrowExpressionClause(
SwitchExpression(
IdentifierName("ma"))
.WithArms(SeparatedList <SwitchExpressionArmSyntax>(tokens))))
.WithSemicolonToken(
Token(SyntaxKind.SemicolonToken))
.NormalizeWhitespace());
}
public Task <SyntaxList <MemberDeclarationSyntax> > GenerateAsync(
TransformationContext context,
IProgress <Diagnostic> progress,
CancellationToken cancellationToken)
{
try
{
if (context.ProcessingNode is InterfaceDeclarationSyntax applyTo)
{
if (applyTo.TypeParameterList.Parameters.Count > 1)
{
CodeGenUtil.ReportError($"Free monads must have only one generic argument", "Free monad Code-Gen", context.ProcessingNode, progress);
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
if (applyTo.TypeParameterList.Parameters.Count == 0)
{
CodeGenUtil.ReportError($"Free monads must a generic argument", "Free monad Code-Gen", context.ProcessingNode, progress);
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
var genA = applyTo.TypeParameterList.Parameters.First().ToString();
var genB = CodeGenUtil.NextGenName(genA);
var genC = CodeGenUtil.NextGenName(genB);
var thisType = ParseTypeName($"{applyTo.Identifier.Text}{applyTo.TypeParameterList}");
var typeA = MakeTypeName(applyTo.Identifier.Text, genA);
var typeB = MakeTypeName(applyTo.Identifier.Text, genB);
var mapFunc = ParseTypeName($"System.Func<{genA}, {genB}>");
var mapIsStatic = applyTo.Members
.OfType <MethodDeclarationSyntax>()
.Where(m => m.Identifier.Text == "Map")
.Where(m => m.ParameterList.Parameters.Count == 2)
.Where(m => m.Modifiers.Any(mo => mo.IsKind(SyntaxKind.StaticKeyword)))
.Where(m => m.Modifiers.Any(mo => mo.IsKind(SyntaxKind.PublicKeyword)))
// .Where(m => m.ReturnType.IsEquivalentTo(typeB))
// .Where(m => m.ParameterList.Parameters[0].Type.IsEquivalentTo(typeA))
// .Where(m => m.ParameterList.Parameters[1].Type.IsEquivalentTo(mapFunc))
.Any();
var caseMethods = applyTo.Members
.OfType <MethodDeclarationSyntax>()
.Where(m => !m.Modifiers.Any(mo => mo.IsKind(SyntaxKind.StaticKeyword)))
.Select(m => MakeFree(m, thisType))
.ToArray();
var firstPure = caseMethods.Where(HasPureAttr)
.Where(m => m.ParameterList.Parameters.Count == 1)
.Where(m => m.ReturnType.IsEquivalentTo(typeA))
.Where(m => m.ParameterList.Parameters.First().Type.ToString() == genA)
.FirstOrDefault();
if (firstPure == null)
{
CodeGenUtil.ReportError($"Type can't be made into a free monad because no method in the interface has [Pure] attribute that takes a single argument of type '{genA}' and returns a '{genA}'", "Free monad Code-Gen", context.ProcessingNode, progress);
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
var caseRes = caseMethods
.Zip(Enumerable.Range(1, int.MaxValue), (m, i) => (m, i))
.Select(m => CodeGenUtil.MakeCaseType(
context,
progress,
applyTo.Identifier,
applyTo.Members,
applyTo.TypeParameterList,
applyTo.Modifiers,
applyTo.ConstraintClauses,
m.m.Identifier,
m.m.TypeParameterList,
m.m.ParameterList
.Parameters
.Select(p => (p.Identifier, p.Type, p.Modifiers, p.AttributeLists))
.ToList(),
BaseSpec.Interface,
caseIsClass: true,
caseIsPartial: false,
includeWithAndLenses: false,
m.i))
.ToList();
var ok = caseRes.All(x => x.Success);
var cases = caseRes.Select(c => c.Type);
var staticCtorClass = MakeStaticClass(
applyTo.Identifier,
caseMethods,
applyTo.TypeParameterList,
applyTo.ConstraintClauses,
firstPure,
mapIsStatic);
if (ok)
{
return(Task.FromResult(List <MemberDeclarationSyntax>().AddRange(cases).Add(staticCtorClass)));
}
else
{
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
}
else
{
CodeGenUtil.ReportError($"Type can't be made into a free monad. It must be an interface", "Free monad Code-Gen", context.ProcessingNode, progress);
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
}
catch (Exception e)
{
CodeGenUtil.ReportError(e.Message, "Free monad Code-Gen", context.ProcessingNode, progress);
foreach (var line in e.StackTrace.Split('\n'))
{
CodeGenUtil.ReportError(line, "Free monad Code-Gen", context.ProcessingNode, progress);
}
return(Task.FromResult(List <MemberDeclarationSyntax>()));
}
}
static MethodDeclarationSyntax MakeMapExtension(
SyntaxToken applyToIdentifier,
SyntaxList <TypeParameterConstraintClauseSyntax> applyToConstraints,
MethodDeclarationSyntax[] applyToMembers,
TypeParameterListSyntax applyToTypeParams)
{
var genA = applyToTypeParams.Parameters.First().ToString();
var genB = CodeGenUtil.NextGenName(genA);
var typeA = MakeTypeName(applyToIdentifier.Text, genA);
var typeB = MakeTypeName(applyToIdentifier.Text, genB);
var mapFuncType = ParseTypeName($"System.Func<{genA}, {genB}>");
return(MethodDeclaration(
typeB,
Identifier("Map"))
.WithModifiers(
TokenList(
new[] { Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.StaticKeyword) }))
.WithTypeParameterList(
TypeParameterList(
SeparatedList <TypeParameterSyntax>(
new SyntaxNodeOrToken[]
{
TypeParameter(
Identifier(genA)),
Token(SyntaxKind.CommaToken), TypeParameter(
Identifier(genB))
})))
.WithParameterList(
ParameterList(
SeparatedList <ParameterSyntax>(
new SyntaxNodeOrToken[]
{
Parameter(
Identifier("ma"))
.WithModifiers(
TokenList(
Token(SyntaxKind.ThisKeyword)))
.WithType(typeA),
Token(SyntaxKind.CommaToken), Parameter(Identifier("f")).WithType(mapFuncType)
})))
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
typeA,
IdentifierName("Map")))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[]
{
Argument(
IdentifierName("ma")),
Token(SyntaxKind.CommaToken), Argument(
IdentifierName("f"))
})))))
.WithSemicolonToken(
Token(SyntaxKind.SemicolonToken)));
}
static MemberDeclarationSyntax[] AddMonadDefaults(
SyntaxToken applyToIdentifier,
MethodDeclarationSyntax[] applyToMembers,
TypeParameterListSyntax applyToTypeParams,
SyntaxList <TypeParameterConstraintClauseSyntax> applyToConstraints)
{
var genA = applyToTypeParams.Parameters.First().ToString();
var genB = CodeGenUtil.NextGenName(genA);
var genC = CodeGenUtil.NextGenName(genB);
var typeA = MakeTypeName(applyToIdentifier.Text, genA);
var liftedTypeA = MakeTypeName(applyToIdentifier.Text, typeA.ToString());
var typeB = MakeTypeName(applyToIdentifier.Text, genB);
var typeC = MakeTypeName(applyToIdentifier.Text, genC);
var bindFuncType = ParseTypeName($"System.Func<{genA}, {typeB}>");
var mapFuncType = ParseTypeName($"System.Func<{genA}, {genB}>");
var projFuncType = ParseTypeName($"System.Func<{genA}, {genB}, {genC}>");
var comma = Token(SyntaxKind.CommaToken);
var typeParamA = TypeParameter(Identifier(genA));
var typeParamB = TypeParameter(Identifier(genB));
var typeParamC = TypeParameter(Identifier(genC));
var typeParamsA =
TypeParameterList(SeparatedList <TypeParameterSyntax>(new SyntaxNodeOrToken[] { typeParamA }));
var typeParamsAB = TypeParameterList(
SeparatedList <TypeParameterSyntax>(
new SyntaxNodeOrToken[]
{
typeParamA,
comma,
typeParamB
}));
var typeParamsABC = TypeParameterList(
SeparatedList <TypeParameterSyntax>(
new SyntaxNodeOrToken[]
{
typeParamA,
comma,
typeParamB,
comma,
typeParamC
}));
var pubStatMods = TokenList(new[] { Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.StaticKeyword) });
var thisMA = Parameter(Identifier("ma"))
.WithModifiers(TokenList(Token(SyntaxKind.ThisKeyword)))
.WithType(typeA);
var thisMMA = Parameter(Identifier("mma"))
.WithModifiers(TokenList(Token(SyntaxKind.ThisKeyword)))
.WithType(liftedTypeA);
return(new MemberDeclarationSyntax[] {
MethodDeclaration(
typeB,
Identifier("Select"))
.WithModifiers(pubStatMods)
.WithTypeParameterList(typeParamsAB)
.WithParameterList(
ParameterList(
SeparatedList <ParameterSyntax>(
new SyntaxNodeOrToken[] {
thisMA,
comma,
Parameter(
Identifier("f"))
.WithType(mapFuncType)
})))
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(
IdentifierName("Map"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
IdentifierName("ma")),
comma,
Argument(
IdentifierName("f"))
})))))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken)),
MethodDeclaration(typeB, Identifier("SelectMany"))
.WithModifiers(pubStatMods)
.WithTypeParameterList(typeParamsAB)
.WithParameterList(
ParameterList(
SeparatedList <ParameterSyntax>(
new SyntaxNodeOrToken[] {
thisMA,
comma,
Parameter(Identifier("f")).WithType(bindFuncType)
})))
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(
IdentifierName("Bind"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
IdentifierName("ma")),
comma,
Argument(
IdentifierName("f"))
})))))
.WithSemicolonToken(
Token(SyntaxKind.SemicolonToken)),
MethodDeclaration(typeC, Identifier("SelectMany"))
.WithModifiers(pubStatMods)
.WithTypeParameterList(typeParamsABC)
.WithParameterList(
ParameterList(
SeparatedList <ParameterSyntax>(
new SyntaxNodeOrToken[] {
thisMA,
comma,
Parameter(Identifier("bind")).WithType(bindFuncType),
comma,
Parameter(Identifier("project")).WithType(projFuncType)
})))
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(
IdentifierName("Bind"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
IdentifierName("ma")),
comma,
Argument(
SimpleLambdaExpression(
Parameter(
Identifier("a")),
InvocationExpression(
IdentifierName("Map"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
InvocationExpression(
IdentifierName("bind"))
.WithArgumentList(
ArgumentList(
SingletonSeparatedList <ArgumentSyntax>(
Argument(
IdentifierName("a")))))),
comma,
Argument(
SimpleLambdaExpression(
Parameter(
Identifier("b")),
InvocationExpression(
IdentifierName("project"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
IdentifierName("a")),
comma,
Argument(
IdentifierName("b"))
})))))
})))))
})))))
.WithSemicolonToken(
Token(SyntaxKind.SemicolonToken)),
MethodDeclaration(typeA, Identifier("Flatten"))
.WithModifiers(pubStatMods)
.WithTypeParameterList(typeParamsA)
.WithParameterList(ParameterList(SingletonSeparatedList <ParameterSyntax>(thisMMA)))
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(
IdentifierName("Bind"))
.WithArgumentList(
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[] {
Argument(
IdentifierName("mma")),
comma,
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("LanguageExt"),
IdentifierName("Prelude")),
IdentifierName("identity")))
})))))
.WithSemicolonToken(
Token(SyntaxKind.SemicolonToken))
});
}