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src/Syntax/DefinitionTable.cs

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+using common;
+using syntax.Parsing;
+using syntax.Parsing.Definitions;
+
+namespace syntax;
+
+public class DefinitionTable
+{
+    private readonly IEnumerable<CompilationUnit> _compilationUnits;
+
+    public DefinitionTable(IEnumerable<CompilationUnit> compilationUnits)
+    {
+        _compilationUnits = compilationUnits;
+    }
+
+    public Optional<IFuncSignature> LookupFunc(string @namespace, string name)
+    {
+        var definition = _compilationUnits
+            .Where(c => c.Namespace == @namespace)
+            .SelectMany(c => c.Definitions)
+            .OfType<IFuncSignature>()
+            .SingleOrDefault(f => f.Name == name);
+
+        return Optional.OfNullable(definition);
+    }
+
+    public Optional<StructDefinitionNode> LookupStruct(string @namespace, string name)
+    {
+        var definition = _compilationUnits
+            .Where(c => c.Namespace == @namespace)
+            .SelectMany(c => c.Definitions)
+            .OfType<StructDefinitionNode>()
+            .SingleOrDefault(f => f.Name == name);
+
+        return Optional.OfNullable(definition);
+    }
+
+    public IEnumerable<StructDefinitionNode> GetStructs()
+    {
+        return _compilationUnits
+            .SelectMany(c => c.Definitions)
+            .OfType<StructDefinitionNode>();
+    }
+}