134 lines
3.3 KiB
C#
134 lines
3.3 KiB
C#
using System.Reflection;
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using meowlang.parser;
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var className = args[0];
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var destinatinDir = args[1] ?? ".";
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var destinationPath = Path.Join(destinatinDir, $"{className}.cs");
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var parserType = typeof(Parser);
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var nameSpace = parserType.Namespace;
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var modelTypes = parserType.Assembly.DefinedTypes.Where(t => t.IsAssignableTo(typeof(ModelBase))).Where(t => !t.IsAbstract);
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string UnModelifyName(string name)
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{
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var nameWithoutModel = name;
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var modelIndex = nameWithoutModel.LastIndexOf("Model", StringComparison.Ordinal);
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if (modelIndex > -1)
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{
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nameWithoutModel = nameWithoutModel.Remove(modelIndex);
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}
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return nameWithoutModel;
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}
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string MakeVisitorMethod(TypeInfo model, bool isVoid)
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{
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if (model == null) throw new ArgumentNullException(nameof(model));
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var typeName = model.Name;
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var visitorName = $"Visit{UnModelifyName(typeName)}";
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return isVoid ? @$"
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public virtual void {visitorName}({typeName} m)
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{{
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foreach (var modelBase in m.GetChildren())
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{{
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Visit(modelBase);
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}}
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}}
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" : @$"
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public virtual T {visitorName}({typeName} m)
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{{
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T result = default;
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foreach (var modelBase in m.GetChildren())
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{{
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result = Visit(modelBase);
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}}
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return result;
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}}
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";
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}
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string MakeSwitchArm(TypeInfo model, bool isVoid)
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{
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if (model == null) throw new ArgumentNullException(nameof(model));
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var typeName = model.Name;
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var visitorName = $"Visit{UnModelifyName(typeName)}";
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return isVoid ? $@"
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case {typeName} x: {visitorName}(x); break;" : $@"
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case {typeName} x: return {visitorName}(x);";
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}
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var arms = new List<string>();
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var voidArms = new List<string>();
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var methods = new List<string>();
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var voidMethods = new List<string>();
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foreach (var modelType in modelTypes)
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{
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arms.Add(MakeSwitchArm(modelType, false));
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voidArms.Add(MakeSwitchArm(modelType, true));
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methods.Add(MakeVisitorMethod(modelType, false));
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voidMethods.Add(MakeVisitorMethod(modelType, true));
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}
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var sourceCode = $@"// automatically generated
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// ReSharper disable MemberCanBeProtected.Global
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// ReSharper disable MemberCanBePrivate.Global
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#pragma warning disable CS8603
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#pragma warning disable CS8600
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#pragma warning disable CS8509
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using System.CodeDom.Compiler;
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namespace {nameSpace};
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[GeneratedCode(""meow-visitorgenerator"", ""1"")]
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public class {className}<T>
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{{
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public T? TryVisit(ModelBase? m)
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{{
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return m == null ? default : Visit(m);
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}}
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public T Visit(ModelBase m)
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{{
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try {{
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switch(m)
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{{
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{string.Join("", arms)}
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}}
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}} catch(Exception e) {{
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if (e is MeowModelVisitorException) throw;
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throw new MeowModelVisitorException(m, e);
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}}
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return default;
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}}
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{string.Join("", methods)}
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}}
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[GeneratedCode(""meow-visitorgenerator"", ""1"")]
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public class {className}
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{{
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public void Visit(ModelBase m)
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{{
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try {{
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switch(m)
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{{
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{string.Join("", voidArms)}
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}}
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}} catch(Exception e) {{
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if (e is MeowModelVisitorException) throw;
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throw new MeowModelVisitorException(m, e);
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}}
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}}
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{string.Join("", voidMethods)}
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}}
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";
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File.WriteAllText(destinationPath, sourceCode);
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Console.WriteLine($"output written to {destinationPath}"); |