472 lines
18 KiB
C#
472 lines
18 KiB
C#
using Common;
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using Syntax.Diagnostics;
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using Syntax.Node;
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using Syntax.Tokenization;
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using UnaryExpressionNode = Syntax.Node.UnaryExpressionNode;
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namespace Syntax.Binding;
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// TODO: Currently anonymous function does not get a new scope
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public static class Binder
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{
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private static SyntaxTree _syntaxTree = null!;
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private static DefinitionTable _definitionTable = null!;
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private static Dictionary<string, NubType> _variables = new();
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private static NubType? _funcReturnType;
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public static BoundSyntaxTree Bind(SyntaxTree syntaxTree, DefinitionTable definitionTable, out IEnumerable<Diagnostic> diagnostics)
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{
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_syntaxTree = syntaxTree;
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_definitionTable = definitionTable;
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_variables = [];
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_funcReturnType = null;
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var definitions = new List<BoundDefinitionNode>();
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foreach (var definition in syntaxTree.Definitions)
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{
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definitions.Add(BindDefinition(definition));
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}
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diagnostics = [];
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return new BoundSyntaxTree(syntaxTree.Namespace, definitions);
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}
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private static BoundDefinitionNode BindDefinition(DefinitionNode node)
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{
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return node switch
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{
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ExternFuncDefinitionNode definition => BindExternFuncDefinition(definition),
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TraitImplementationDefinitionNode definition => BindTraitImplementation(definition),
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TraitDefinitionNode definition => BindTraitDefinition(definition),
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LocalFuncDefinitionNode definition => BindLocalFuncDefinition(definition),
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StructDefinitionNode definition => BindStruct(definition),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private static BoundTraitImplementationDefinitionNode BindTraitImplementation(TraitImplementationDefinitionNode node)
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{
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_variables.Clear();
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var functions = new List<BoundImplementationFuncNode>();
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foreach (var function in node.Functions)
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{
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foreach (var parameter in function.Parameters)
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{
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_variables[parameter.Name] = parameter.Type;
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}
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functions.Add(new BoundImplementationFuncNode(function.Tokens, function.Name, function.Parameters, function.ReturnType, BindBlock(function.Body)));
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}
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return new BoundTraitImplementationDefinitionNode(node.Tokens, node.Namespace, node.TraitType, node.ForType, functions);
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}
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private static BoundTraitDefinitionNode BindTraitDefinition(TraitDefinitionNode node)
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{
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var functions = new List<BountTraitFunc>();
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foreach (var func in node.Functions)
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{
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functions.Add(new BountTraitFunc(func.Name, func.Parameters, func.ReturnType));
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}
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return new BoundTraitDefinitionNode(node.Tokens, node.Namespace, node.Name, functions);
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}
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private static BoundStructDefinitionNode BindStruct(StructDefinitionNode node)
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{
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var defOpt = _definitionTable.LookupStruct(node.Namespace, node.Name);
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if (!defOpt.TryGetValue(out var definition))
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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var structFields = new List<BoundStructField>();
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foreach (var structField in node.Fields)
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{
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var value = Optional.Empty<BoundExpressionNode>();
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if (structField.Value.HasValue)
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{
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var definitionField = definition.Fields.FirstOrDefault(f => f.Name == structField.Name);
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if (definitionField == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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value = BindExpression(structField.Value.Value, definitionField.Type);
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}
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structFields.Add(new BoundStructField(structField.Name, structField.Type, value));
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}
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return new BoundStructDefinitionNode(node.Tokens, node.Namespace, node.Name, structFields);
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}
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private static BoundExternFuncDefinitionNode BindExternFuncDefinition(ExternFuncDefinitionNode node)
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{
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return new BoundExternFuncDefinitionNode(node.Tokens, node.Namespace, node.Name, node.CallName, node.Parameters, node.ReturnType);
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}
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private static BoundLocalFuncDefinitionNode BindLocalFuncDefinition(LocalFuncDefinitionNode node)
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{
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_variables.Clear();
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_funcReturnType = node.ReturnType;
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foreach (var parameter in node.Parameters)
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{
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_variables[parameter.Name] = parameter.Type;
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}
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var body = BindBlock(node.Body);
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return new BoundLocalFuncDefinitionNode(node.Tokens, node.Namespace, node.Name, node.Parameters, body, node.ReturnType, node.Exported);
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}
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private static BoundBlock BindBlock(BlockNode node)
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{
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var statements = new List<BoundStatementNode>();
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foreach (var statement in node.Statements)
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{
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statements.Add(BindStatement(statement));
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}
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return new BoundBlock(node.Tokens, statements);
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}
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private static BoundStatementNode BindStatement(StatementNode node)
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{
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return node switch
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{
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AssignmentNode statement => BindAssignment(statement),
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BreakNode statement => BindBreak(statement),
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ContinueNode statement => BindContinue(statement),
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IfNode statement => BindIf(statement),
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ReturnNode statement => BindReturn(statement),
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StatementExpressionNode statement => BindStatementExpression(statement),
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VariableDeclarationNode statement => BindVariableDeclaration(statement),
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WhileNode statement => BindWhile(statement),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private static BoundStatementNode BindAssignment(AssignmentNode statement)
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{
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var expression = BindExpression(statement.Expression);
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var value = BindExpression(statement.Value, expression.Type);
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return new BoundAssignmentNode(statement.Tokens, expression, value);
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}
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private static BoundBreakNode BindBreak(BreakNode statement)
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{
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return new BoundBreakNode(statement.Tokens);
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}
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private static BoundContinueNode BindContinue(ContinueNode statement)
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{
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return new BoundContinueNode(statement.Tokens);
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}
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private static BoundIfNode BindIf(IfNode statement)
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{
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var elseStatement = Optional.Empty<Variant<BoundIfNode, BoundBlock>>();
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if (statement.Else.HasValue)
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{
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elseStatement = statement.Else.Value.Match<Variant<BoundIfNode, BoundBlock>>
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(
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elseIf => BindIf(elseIf),
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@else => BindBlock(@else)
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);
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}
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return new BoundIfNode(statement.Tokens, BindExpression(statement.Condition, NubPrimitiveType.Bool), BindBlock(statement.Body), elseStatement);
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}
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private static BoundReturnNode BindReturn(ReturnNode statement)
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{
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var value = Optional.Empty<BoundExpressionNode>();
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if (statement.Value.HasValue)
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{
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value = BindExpression(statement.Value.Value, _funcReturnType);
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}
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return new BoundReturnNode(statement.Tokens, value);
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}
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private static BoundStatementExpressionNode BindStatementExpression(StatementExpressionNode statement)
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{
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return new BoundStatementExpressionNode(statement.Tokens, BindExpression(statement.Expression));
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}
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private static BoundVariableDeclarationNode BindVariableDeclaration(VariableDeclarationNode statement)
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{
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NubType? type = null;
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if (statement.ExplicitType.HasValue)
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{
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type = statement.ExplicitType.Value;
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}
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var assignment = Optional<BoundExpressionNode>.Empty();
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if (statement.Assignment.HasValue)
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{
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var boundValue = BindExpression(statement.Assignment.Value, type);
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assignment = boundValue;
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type = boundValue.Type;
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}
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if (type == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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_variables[statement.Name] = type;
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return new BoundVariableDeclarationNode(statement.Tokens, statement.Name, statement.ExplicitType, assignment, type);
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}
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private static BoundWhileNode BindWhile(WhileNode statement)
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{
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return new BoundWhileNode(statement.Tokens, BindExpression(statement.Condition, NubPrimitiveType.Bool), BindBlock(statement.Body));
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}
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private static BoundExpressionNode BindExpression(ExpressionNode node, NubType? expectedType = null)
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{
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return node switch
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{
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AddressOfNode expression => BindAddressOf(expression),
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AnonymousFuncNode expression => BindAnonymousFunc(expression),
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ArrayIndexAccessNode expression => BindArrayIndexAccess(expression),
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ArrayInitializerNode expression => BindArrayInitializer(expression),
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BinaryExpressionNode expression => BindBinaryExpression(expression),
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DereferenceNode expression => BindDereference(expression),
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FuncCallNode expression => BindFuncCall(expression),
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IdentifierNode expression => BindIdentifier(expression),
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LiteralNode expression => BindLiteral(expression, expectedType),
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MemberAccessNode expression => BindMemberAccess(expression),
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StructInitializerNode expression => BindStructInitializer(expression),
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UnaryExpressionNode expression => BindUnaryExpression(expression),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private static BoundAddressOfNode BindAddressOf(AddressOfNode expression)
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{
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var inner = BindExpression(expression.Expression);
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return new BoundAddressOfNode(expression.Tokens, new NubPointerType(inner.Type), inner);
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}
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private static BoundAnonymousFuncNode BindAnonymousFunc(AnonymousFuncNode expression)
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{
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var parameterTypes = expression.Parameters.Select(x => x.Type).ToList();
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var body = BindBlock(expression.Body);
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return new BoundAnonymousFuncNode(expression.Tokens, new NubFuncType(expression.ReturnType, parameterTypes), expression.Parameters, body, expression.ReturnType);
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}
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private static BoundArrayIndexAccessNode BindArrayIndexAccess(ArrayIndexAccessNode expression)
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{
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var boundArray = BindExpression(expression.Array);
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var elementType = ((NubArrayType)boundArray.Type).ElementType;
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return new BoundArrayIndexAccessNode(expression.Tokens, elementType, boundArray, BindExpression(expression.Index, NubPrimitiveType.U64));
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}
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private static BoundArrayInitializerNode BindArrayInitializer(ArrayInitializerNode expression)
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{
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return new BoundArrayInitializerNode(expression.Tokens, new NubArrayType(expression.ElementType), BindExpression(expression.Capacity, NubPrimitiveType.U64), expression.ElementType);
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}
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private static BoundBinaryExpressionNode BindBinaryExpression(BinaryExpressionNode expression)
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{
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var boundLeft = BindExpression(expression.Left);
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var boundRight = BindExpression(expression.Right, boundLeft.Type);
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return new BoundBinaryExpressionNode(expression.Tokens, boundLeft.Type, boundLeft, expression.Operator, boundRight);
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}
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private static BoundDereferenceNode BindDereference(DereferenceNode expression)
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{
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var boundExpression = BindExpression(expression.Expression);
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var dereferencedType = ((NubPointerType)boundExpression.Type).BaseType;
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return new BoundDereferenceNode(expression.Tokens, dereferencedType, boundExpression);
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}
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private static BoundFuncCallNode BindFuncCall(FuncCallNode expression)
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{
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var boundExpression = BindExpression(expression.Expression);
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var funcType = (NubFuncType)boundExpression.Type;
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var returnType = ((NubFuncType)boundExpression.Type).ReturnType;
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var parameters = new List<BoundExpressionNode>();
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foreach (var (i, parameter) in expression.Parameters.Index())
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{
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if (i >= funcType.Parameters.Count)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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var expectedType = funcType.Parameters[i];
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parameters.Add(BindExpression(parameter, expectedType));
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}
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return new BoundFuncCallNode(expression.Tokens, returnType, boundExpression, parameters);
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}
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private static BoundIdentifierNode BindIdentifier(IdentifierNode expression)
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{
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NubType? type = null;
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var definition = _definitionTable.LookupFunction(expression.Namespace.Or(_syntaxTree.Namespace), expression.Name);
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if (definition.HasValue)
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{
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type = new NubFuncType(definition.Value.ReturnType, definition.Value.Parameters.Select(p => p.Type).ToList());
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}
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if (type == null && !expression.Namespace.HasValue)
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{
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type = _variables[expression.Name];
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}
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if (type == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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return new BoundIdentifierNode(expression.Tokens, type, expression.Namespace, expression.Name);
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}
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private static BoundLiteralNode BindLiteral(LiteralNode expression, NubType? expectedType = null)
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{
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var type = expectedType ?? expression.Kind switch
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{
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LiteralKind.Integer => NubPrimitiveType.I64,
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LiteralKind.Float => NubPrimitiveType.F64,
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LiteralKind.String => new NubStringType(),
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LiteralKind.Bool => NubPrimitiveType.Bool,
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_ => throw new ArgumentOutOfRangeException()
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};
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return new BoundLiteralNode(expression.Tokens, type, expression.Literal, expression.Kind);
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}
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private static BoundMemberAccessNode BindMemberAccess(MemberAccessNode expression)
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{
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var boundExpression = BindExpression(expression.Expression);
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var implementation = _definitionTable.LookupTraitImplementationForType(boundExpression.Type, expression.Member);
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if (implementation.HasValue)
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{
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var type = new NubFuncType(implementation.Value.Item2.ReturnType, implementation.Value.Item2.Parameters.Select(p => p.Type).ToList());
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return new BoundMemberAccessNode(expression.Tokens, type, boundExpression, expression.Member);
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}
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if (boundExpression.Type is NubCustomType customType)
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{
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var function = _definitionTable.LookupFunctionOnTrait(customType.Namespace, customType.Name, expression.Member);
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if (function.HasValue)
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{
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var type = new NubFuncType(function.Value.ReturnType, function.Value.Parameters.Select(p => p.Type).ToList());
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return new BoundMemberAccessNode(expression.Tokens, type, boundExpression, expression.Member);
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}
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var structDef = _definitionTable.LookupStruct(customType.Namespace, customType.Name);
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if (structDef.HasValue)
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{
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var matchingFields = structDef.Value.Fields.Where(f => f.Name == expression.Member).ToList();
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if (matchingFields.Count > 1)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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if (matchingFields.Count == 1)
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{
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return new BoundMemberAccessNode(expression.Tokens, matchingFields[0].Type, boundExpression, expression.Member);
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}
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}
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}
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if (boundExpression.Type is NubStringType or NubCStringType or NubArrayType && expression.Member == "count")
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{
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return new BoundMemberAccessNode(expression.Tokens, NubPrimitiveType.I64, boundExpression, expression.Member);
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}
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throw new NotImplementedException("Diagnostics not implemented");
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}
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private static BoundStructInitializerNode BindStructInitializer(StructInitializerNode expression)
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{
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if (expression.StructType is not NubCustomType structType)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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var defOpt = _definitionTable.LookupStruct(structType.Namespace, structType.Name);
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if (!defOpt.TryGetValue(out var definition))
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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var initializers = new Dictionary<string, BoundExpressionNode>();
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foreach (var (member, initializer) in expression.Initializers)
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{
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var definitionField = definition.Fields.FirstOrDefault(x => x.Name == member);
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if (definitionField == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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initializers[member] = BindExpression(initializer, definitionField.Type);
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}
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return new BoundStructInitializerNode(expression.Tokens, structType, structType, initializers);
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}
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private static BoundUnaryExpressionNode BindUnaryExpression(UnaryExpressionNode expression)
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{
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var boundOperand = BindExpression(expression.Operand);
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NubType? type = null;
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switch (expression.Operator)
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{
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case UnaryExpressionOperator.Negate:
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{
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boundOperand = BindExpression(expression.Operand, NubPrimitiveType.I64);
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if (boundOperand.Type.IsNumber)
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{
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type = boundOperand.Type;
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}
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break;
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}
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case UnaryExpressionOperator.Invert:
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{
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boundOperand = BindExpression(expression.Operand, NubPrimitiveType.Bool);
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type = new NubPrimitiveType(PrimitiveTypeKind.Bool);
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break;
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}
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}
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if (type == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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return new BoundUnaryExpressionNode(expression.Tokens, type, expression.Operator, boundOperand);
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}
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} |