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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Emit;
using Newtonsoft.Json.Linq;
namespace Microsoft.WebAssembly.Diagnostics
{
internal class EvaluateExpression
{
class FindThisExpression : CSharpSyntaxWalker
{
public List<string> thisExpressions = new List<string>();
public SyntaxTree syntaxTree;
public FindThisExpression(SyntaxTree syntax)
{
syntaxTree = syntax;
}
public override void Visit(SyntaxNode node)
{
if (node is ThisExpressionSyntax)
{
if (node.Parent is MemberAccessExpressionSyntax thisParent && thisParent.Name is IdentifierNameSyntax)
{
IdentifierNameSyntax var = thisParent.Name as IdentifierNameSyntax;
thisExpressions.Add(var.Identifier.Text);
var newRoot = syntaxTree.GetRoot().ReplaceNode(node.Parent, thisParent.Name);
syntaxTree = syntaxTree.WithRootAndOptions(newRoot, syntaxTree.Options);
this.Visit(GetExpressionFromSyntaxTree(syntaxTree));
}
}
else
base.Visit(node);
}
public async Task CheckIfIsProperty(MonoProxy proxy, MessageId msg_id, int scope_id, CancellationToken token)
{
foreach (var var in thisExpressions)
{
JToken value = await proxy.TryGetVariableValue(msg_id, scope_id, var, true, token);
if (value == null)
throw new Exception($"The property {var} does not exist in the current context");
}
}
}
class FindVariableNMethodCall : CSharpSyntaxWalker
{
public List<IdentifierNameSyntax> variables = new List<IdentifierNameSyntax>();
public List<ThisExpressionSyntax> thisList = new List<ThisExpressionSyntax>();
public List<InvocationExpressionSyntax> methodCall = new List<InvocationExpressionSyntax>();
public List<object> values = new List<Object>();
public override void Visit(SyntaxNode node)
{
if (node is IdentifierNameSyntax identifier && !variables.Any(x => x.Identifier.Text == identifier.Identifier.Text))
variables.Add(identifier);
if (node is InvocationExpressionSyntax)
{
methodCall.Add(node as InvocationExpressionSyntax);
throw new Exception("Method Call is not implemented yet");
}
if (node is AssignmentExpressionSyntax)
throw new Exception("Assignment is not implemented yet");
base.Visit(node);
}
public async Task<SyntaxTree> ReplaceVars(SyntaxTree syntaxTree, MonoProxy proxy, MessageId msg_id, int scope_id, CancellationToken token)
{
CompilationUnitSyntax root = syntaxTree.GetCompilationUnitRoot();
foreach (var var in variables)
{
ClassDeclarationSyntax classDeclaration = root.Members.ElementAt(0) as ClassDeclarationSyntax;
MethodDeclarationSyntax method = classDeclaration.Members.ElementAt(0) as MethodDeclarationSyntax;
JToken value = await proxy.TryGetVariableValue(msg_id, scope_id, var.Identifier.Text, false, token);
if (value == null)
throw new Exception($"The name {var.Identifier.Text} does not exist in the current context");
values.Add(ConvertJSToCSharpType(value["value"]));
var updatedMethod = method.AddParameterListParameters(
SyntaxFactory.Parameter(
SyntaxFactory.Identifier(var.Identifier.Text))
.WithType(SyntaxFactory.ParseTypeName(GetTypeFullName(value["value"]))));
root = root.ReplaceNode(method, updatedMethod);
}
syntaxTree = syntaxTree.WithRootAndOptions(root, syntaxTree.Options);
return syntaxTree;
}
private object ConvertJSToCSharpType(JToken variable)
{
var value = variable["value"];
var type = variable["type"].Value<string>();
var subType = variable["subtype"]?.Value<string>();
switch (type)
{
case "string":
return value?.Value<string>();
case "number":
return value?.Value<double>();
case "boolean":
return value?.Value<bool>();
case "object":
if (subType == "null")
return null;
break;
}
throw new Exception($"Evaluate of this datatype {type} not implemented yet");
}
private string GetTypeFullName(JToken variable)
{
var type = variable["type"].ToString();
var subType = variable["subtype"]?.Value<string>();
object value = ConvertJSToCSharpType(variable);
switch (type)
{
case "object":
{
if (subType == "null")
return variable["className"].Value<string>();
break;
}
default:
return value.GetType().FullName;
}
throw new Exception($"Evaluate of this datatype {type} not implemented yet");
}
}
static SyntaxNode GetExpressionFromSyntaxTree(SyntaxTree syntaxTree)
{
CompilationUnitSyntax root = syntaxTree.GetCompilationUnitRoot();
ClassDeclarationSyntax classDeclaration = root.Members.ElementAt(0) as ClassDeclarationSyntax;
MethodDeclarationSyntax methodDeclaration = classDeclaration.Members.ElementAt(0) as MethodDeclarationSyntax;
BlockSyntax blockValue = methodDeclaration.Body;
ReturnStatementSyntax returnValue = blockValue.Statements.ElementAt(0) as ReturnStatementSyntax;
InvocationExpressionSyntax expressionInvocation = returnValue.Expression as InvocationExpressionSyntax;
MemberAccessExpressionSyntax expressionMember = expressionInvocation.Expression as MemberAccessExpressionSyntax;
ParenthesizedExpressionSyntax expressionParenthesized = expressionMember.Expression as ParenthesizedExpressionSyntax;
return expressionParenthesized.Expression;
}
internal static async Task<string> CompileAndRunTheExpression(MonoProxy proxy, MessageId msg_id, int scope_id, string expression, CancellationToken token)
{
FindVariableNMethodCall findVarNMethodCall = new FindVariableNMethodCall();
string retString;
SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(@"
using System;
public class CompileAndRunTheExpression
{
public string Evaluate()
{
return (" + expression + @").ToString();
}
}");
FindThisExpression findThisExpression = new FindThisExpression(syntaxTree);
var expressionTree = GetExpressionFromSyntaxTree(syntaxTree);
findThisExpression.Visit(expressionTree);
await findThisExpression.CheckIfIsProperty(proxy, msg_id, scope_id, token);
syntaxTree = findThisExpression.syntaxTree;
expressionTree = GetExpressionFromSyntaxTree(syntaxTree);
findVarNMethodCall.Visit(expressionTree);
syntaxTree = await findVarNMethodCall.ReplaceVars(syntaxTree, proxy, msg_id, scope_id, token);
MetadataReference[] references = new MetadataReference[]
{
MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location)
};
CSharpCompilation compilation = CSharpCompilation.Create(
"compileAndRunTheExpression",
syntaxTrees: new[] { syntaxTree },
references: references,
options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
using (var ms = new MemoryStream())
{
EmitResult result = compilation.Emit(ms);
ms.Seek(0, SeekOrigin.Begin);
Assembly assembly = Assembly.Load(ms.ToArray());
Type type = assembly.GetType("CompileAndRunTheExpression");
object obj = Activator.CreateInstance(type);
var ret = type.InvokeMember("Evaluate",
BindingFlags.Default | BindingFlags.InvokeMethod,
null,
obj,
findVarNMethodCall.values.ToArray());
retString = ret.ToString();
}
return retString;
}
}
}
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