private static void GenerateMethodStub(StringBuilder output, ClassDeclarationSyntax classSyntax, JSMethodGroup methodGroup, string returnType = "object")
{
output.AppendLine();
output.AppendLine($"\t\tprivate static {returnType} {methodGroup.StubName}(ScriptEngine engine, object thisObj, object[] args)");
output.AppendLine("\t\t{");
if (!methodGroup.IsStatic)
{
output.AppendLine($"\t\t\tthisObj = TypeConverter.ToObject(engine, thisObj);");
output.AppendLine($"\t\t\tif (!(thisObj is {classSyntax.Identifier.ToString()}))");
output.AppendLine($"\t\t\t\tthrow new JavaScriptException(engine, ErrorType.TypeError, \"The method '{methodGroup.First().FunctionName}' is not generic.\");");
}
else if (methodGroup.Any(m => m.HasThisObject && m.ThisObjectParameterType != "object"))
{
output.AppendLine("\t\t\tif (thisObj == null || thisObj == Undefined.Value || thisObj == Null.Value)");
output.AppendLine("\t\t\t\tthrow new JavaScriptException(engine, ErrorType.TypeError, \"Cannot convert undefined or null to object.\");");
}
int maxParameterCount = methodGroup.Max(mds => mds.Parameters.Count());
if (maxParameterCount == 0)
{
output.Append("\t\t\t");
output.AppendLine(GenerateMethodCall(classSyntax, methodGroup.Single(), 0));
}
else
{
output.AppendLine("\t\t\tswitch (args.Length)");
output.AppendLine("\t\t\t{");
for (int i = 0; i <= maxParameterCount; i++)
{
// If the parameter count is X, then find the method with smallest number of
// parameters which has at least X parameters.
var method = methodGroup.Where(mds => mds.Parameters.Count() >= i).OrderBy(mds => mds.Parameters.Count()).First();
if (i < maxParameterCount)
{
output.AppendLine($"\t\t\t\tcase {i}:");
}
else
{
output.AppendLine($"\t\t\t\tdefault:");
}
output.Append("\t\t\t\t\t");
if (i < methodGroup.RequiredArgumentCount)
{
output.AppendLine($"throw new JavaScriptException(engine, ErrorType.TypeError, \"Required argument '{method.Parameters.Skip(i).First().Name}' was not specified.\");");
}
else
{
output.AppendLine(GenerateMethodCall(classSyntax, method, i));
}
}
output.AppendLine("\t\t\t}");
}
output.AppendLine("\t\t}");
}
static void Main(string[] args)
{
IEnumerable <string> files = Directory.EnumerateFiles(@"..\..\..\..\Jurassic", "*.cs", SearchOption.AllDirectories);
files = files.Union(Directory.EnumerateFiles(@"..\..\..\..\Jurassic.Extensions", "*.cs", SearchOption.AllDirectories));
foreach (var csFilePath in files)
{
var syntaxTree = CSharpSyntaxTree.ParseText(File.ReadAllText(csFilePath));
var classCollector = new ClassCollector();
classCollector.Visit(syntaxTree.GetRoot());
// Construct the output file.
var output = new StringBuilder();
output.AppendLine("/*");
output.AppendLine(" * This file is auto-generated, do not modify directly.");
output.AppendLine(" */");
output.AppendLine();
output.AppendLine("using System.Collections.Generic;");
output.AppendLine("using Jurassic;");
if (classCollector.Classes.Any(classSyntax => ((NamespaceDeclarationSyntax)classSyntax.Parent).Name.ToString() != "Jurassic.Library"))
{
output.AppendLine("using Jurassic.Library;");
}
output.AppendLine();
bool outputFile = false;
foreach (var classSyntax in classCollector.Classes)
{
// Find all the methods with [JSInternalFunction], [JSCallFunction], [JSConstructorFunction], [JSProperty] or [JSField].
var memberCollector = new ClassMembersCollector();
memberCollector.Visit(classSyntax);
if (memberCollector.JSInternalFunctionMethods.Any() == false &&
memberCollector.JSCallFunctionMethods.Any() == false &&
memberCollector.JSConstructorFunctionMethods.Any() == false &&
memberCollector.JSProperties.Any() == false &&
memberCollector.JSFields.Any() == false)
{
continue;
}
Console.WriteLine($"Generating stubs for {classSyntax.Identifier.ToString()}");
outputFile = true;
var methodGroups = JSMethodGroup.FromMethods(memberCollector.JSInternalFunctionMethods);
output.AppendLine($"namespace {((NamespaceDeclarationSyntax)classSyntax.Parent).Name}");
output.AppendLine("{");
output.AppendLine();
output.AppendLine($"\t{classSyntax.Modifiers} class {classSyntax.Identifier}");
output.AppendLine("\t{");
// Output the PopulateStubs method.
if (memberCollector.JSInternalFunctionMethods.Any() ||
memberCollector.JSProperties.Any() ||
memberCollector.JSFields.Any())
{
output.AppendLine("\t\tprivate static List<PropertyNameAndValue> GetDeclarativeProperties(ScriptEngine engine)");
output.AppendLine("\t\t{");
output.AppendLine($"\t\t\treturn new List<PropertyNameAndValue>({memberCollector.JSInternalFunctionMethods.Count + memberCollector.JSFields.Count + 4})");
output.AppendLine("\t\t\t{");
foreach (var field in memberCollector.JSFields)
{
foreach (var variable in field.Declaration.Variables)
{
output.AppendLine($"\t\t\t\tnew PropertyNameAndValue(\"{variable.Identifier.ToString()}\", {variable.Identifier.ToString()}, PropertyAttributes.Sealed),");
}
}
foreach (var property in memberCollector.JSProperties.Select(p => new JSProperty(p)))
{
if (property.SetterStubName == null)
{
output.AppendLine($"\t\t\t\tnew PropertyNameAndValue({property.PropertyKey}, new PropertyDescriptor(" +
$"new ClrStubFunction(engine, \"get {property.FunctionName}\", 0, {property.GetterStubName}), " +
$"null, {property.JSPropertyAttributes})),");
}
else
{
output.AppendLine($"\t\t\t\tnew PropertyNameAndValue({property.PropertyKey}, new PropertyDescriptor(" +
$"new ClrStubFunction(engine, \"get {property.FunctionName}\", 0, {property.GetterStubName}), " +
$"new ClrStubFunction(engine, \"set {property.FunctionName}\", 0, {property.GetterStubName}), " +
$"{property.JSPropertyAttributes})),");
}
}
foreach (var methodGroup in methodGroups)
{
output.AppendLine($"\t\t\t\tnew PropertyNameAndValue({methodGroup.PropertyKey}, " +
$"new ClrStubFunction(engine, \"{methodGroup.FunctionName}\", " +
$"{methodGroup.JSLength}, {methodGroup.StubName}), {methodGroup.JSPropertyAttributes}),");
}
output.AppendLine("\t\t\t};");
output.AppendLine("\t\t}");
}
if (memberCollector.JSCallFunctionMethods.Any())
{
GenerateMethodStub(output, classSyntax, new JSMethodGroup(memberCollector.JSCallFunctionMethods.Select(mds => new JSMethod(mds))));
}
if (memberCollector.JSConstructorFunctionMethods.Any())
{
GenerateMethodStub(output, classSyntax, new JSMethodGroup(memberCollector.JSConstructorFunctionMethods.Select(mds => new JSMethod(mds))), "ObjectInstance");
}
foreach (var property in memberCollector.JSProperties.Select(p => new JSProperty(p)))
{
output.AppendLine();
output.AppendLine($"\t\tprivate static object {property.GetterStubName}(ScriptEngine engine, object thisObj, object[] args)");
output.AppendLine("\t\t{");
output.AppendLine($"\t\t\tthisObj = TypeConverter.ToObject(engine, thisObj);");
output.AppendLine($"\t\t\tif (!(thisObj is {classSyntax.Identifier.ToString()}))");
output.AppendLine($"\t\t\t\tthrow new JavaScriptException(engine, ErrorType.TypeError, \"The method 'get {property.FunctionName}' is not generic.\");");
output.AppendLine($"\t\t\treturn (({classSyntax.Identifier.ToString()})thisObj).{property.PropertyName};");
output.AppendLine("\t\t}");
if (property.SetterStubName != null)
{
output.AppendLine();
output.AppendLine($"\t\tprivate static object {property.SetterStubName}(ScriptEngine engine, object thisObj, object[] args)");
output.AppendLine("\t\t{");
output.AppendLine($"\t\t\tthisObj = TypeConverter.ToObject(engine, thisObj);");
output.AppendLine($"\t\t\tif (!(thisObj is {classSyntax.Identifier.ToString()}))");
output.AppendLine($"\t\t\t\tthrow new JavaScriptException(engine, ErrorType.TypeError, \"The method 'set {property.FunctionName}' is not generic.\");");
output.AppendLine($"\t\t\t(({classSyntax.Identifier.ToString()})thisObj).{property.PropertyName} = {ConvertTo("args.Length > 0 ? args[0] : Undefined.Value", property.ReturnType, null)};");
output.AppendLine("\t\t}");
}
}
foreach (var methodGroup in methodGroups)
{
GenerateMethodStub(output, classSyntax, methodGroup);
}
output.AppendLine("\t}");
output.AppendLine();
output.AppendLine("}");
}
if (outputFile)
{
// Write the output file.
File.WriteAllText(Path.Combine(Path.GetDirectoryName(csFilePath), Path.GetFileNameWithoutExtension(csFilePath) + ".g.cs"), output.ToString());
}
}
}
