public CodeGenerationResult GetCode(ParseTreeNode ast, string context)
{
if (ast == null)
{
return(null);
}
CodeGenerationResult result = null, result1 = null, result2 = null;
string t = "";
string code = "";
Symbol symbol;
switch (ast.Term.Name)
{
case "FUNC":
//symbol = st.Find(ast.ChildNodes[1].FindTokenAndGetText(), "FUNC", 0, "");
symbol = st.FindFunction(st.GetFunctionID(ast, context));
code = $"function {symbol.FunctionId}{{\n";
int sentsNodeId = symbol.Node.ChildNodes.Count - 1;
code += GetCode(symbol.Node.ChildNodes[sentsNodeId], symbol.FunctionId).Code;
code += "}";
return(new CodeGenerationResult(code, ""));
case "E":
switch (ast.ChildNodes.Count)
{
case 1:
result1 = GetCode(ast.ChildNodes[0], context);
t = GetT();
code = result1.Code;
code += $"{t} = {result1.Result};\n";
return(new CodeGenerationResult(code, t));
case 3:
result1 = GetCode(ast.ChildNodes[0], context);
result2 = GetCode(ast.ChildNodes[2], context);
t = GetT();
code = $"{t} = {result1.Result} {ast.ChildNodes[1].FindTokenAndGetText()} {result2.Result};\n";
return(new CodeGenerationResult(result1.Code + result2.Code + code, t));
}
break;
case "=":
result1 = GetCode(ast.ChildNodes[0], context);
result2 = GetCode(ast.ChildNodes[1], context);
code = result1.Code;
code += result2.Code;
code += $"{result1.Result} = {result2.Result};\n";
return(new CodeGenerationResult(code, ""));
case "num":
return(new CodeGenerationResult("", ast.FindTokenAndGetText()));
case "id":
symbol = st.Find(ast.FindTokenAndGetText(), "PARAM", 0, context);
t = GetT();
code = $"{t} = p + {symbol.Position};\n";
result = new CodeGenerationResult(code, $"stack[{t}]");
return(result);
default:
code = "";
foreach (ParseTreeNode child in ast.ChildNodes)
{
code += GetCode(child, context).Code;
}
return(new CodeGenerationResult(code, ""));
}
return(result);
}
