forked from PuqiAR/Fig-TreeWalker
523 lines
25 KiB
C++
523 lines
25 KiB
C++
#include <evaluator.hpp>
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#include <builtins.hpp>
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#include <utils.hpp>
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namespace Fig
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{
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Value Evaluator::__evalOp(Ast::Operator op, const Value &lhs, const Value &rhs)
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{
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using Fig::Ast::Operator;
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switch (op)
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{
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case Operator::Add: return lhs + rhs;
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case Operator::Subtract: return lhs - rhs;
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case Operator::Multiply: return lhs * rhs;
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case Operator::Divide: return lhs / rhs;
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case Operator::Modulo: return lhs % rhs;
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case Operator::And: return lhs && rhs;
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case Operator::Or: return lhs || rhs;
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case Operator::Not: return !lhs;
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case Operator::Equal: return Value(lhs == rhs);
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case Operator::NotEqual: return Value(lhs != rhs);
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case Operator::Less: return lhs < rhs;
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case Operator::LessEqual: return lhs <= rhs;
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case Operator::Greater: return lhs > rhs;
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case Operator::GreaterEqual: return lhs >= rhs;
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case Operator::BitAnd: return bit_and(lhs, rhs);
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case Operator::BitOr: return bit_or(lhs, rhs);
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case Operator::BitXor: return bit_xor(lhs, rhs);
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case Operator::BitNot: return bit_not(lhs);
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case Operator::ShiftLeft: return shift_left(lhs, rhs);
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case Operator::ShiftRight: return shift_right(lhs, rhs);
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case Operator::Walrus: {
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static constexpr char WalrusErrorName[] = "WalrusError";
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throw EvaluatorError<WalrusErrorName>(FStringView(u8"Walrus operator is not supported"), currentAddressInfo); // using parent address info for now
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}
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default:
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throw RuntimeError(FStringView(u8"Unsupported operator"));
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}
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}
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Value Evaluator::evalBinary(const Ast::BinaryExpr &binExp)
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{
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return __evalOp(binExp->op, eval(binExp->lexp), eval(binExp->rexp));
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}
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Value Evaluator::evalUnary(const Ast::UnaryExpr &unExp)
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{
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using Fig::Ast::Operator;
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switch (unExp->op)
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{
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case Operator::Not:
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return !eval(unExp->exp);
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case Operator::Subtract:
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return -eval(unExp->exp);
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case Operator::BitNot:
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return bit_not(eval(unExp->exp));
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default:
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throw RuntimeError(FStringView(std::format("Unsupported unary operator: {}", magic_enum::enum_name(unExp->op))));
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}
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}
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Value Evaluator::evalFunctionCall(const Function &fn, const Ast::FunctionArguments &fnArgs, FString fnName)
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{
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FunctionStruct fnStruct = fn.getValue();
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Ast::FunctionCallArgs evaluatedArgs;
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if (fnStruct.isBuiltin)
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{
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for (const auto &argExpr : fnArgs.argv)
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{
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evaluatedArgs.argv.push_back(eval(argExpr));
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}
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if (fnStruct.builtinParamCount != -1 && fnStruct.builtinParamCount != evaluatedArgs.getLength())
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{
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static constexpr char BuiltinArgumentMismatchErrorName[] = "BuiltinArgumentMismatchError";
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throw EvaluatorError<BuiltinArgumentMismatchErrorName>(FStringView(std::format("Builtin function '{}' expects {} arguments, but {} were provided", fnName.toBasicString(), fnStruct.builtinParamCount, evaluatedArgs.getLength())), currentAddressInfo);
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}
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return fnStruct.builtin(evaluatedArgs.argv);
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}
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// check argument, all types of parameters
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Ast::FunctionParameters fnParas = fnStruct.paras;
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if (fnArgs.getLength() < fnParas.posParas.size() || fnArgs.getLength() > fnParas.size())
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{
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static constexpr char ArgumentMismatchErrorName[] = "ArgumentMismatchError";
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throw EvaluatorError<ArgumentMismatchErrorName>(FStringView(std::format("Function '{}' expects {} to {} arguments, but {} were provided", fnName.toBasicString(), fnParas.posParas.size(), fnParas.size(), fnArgs.getLength())), currentAddressInfo);
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}
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// positional parameters type check
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size_t i;
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for (i = 0; i < fnParas.posParas.size(); i++)
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{
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TypeInfo expectedType(fnParas.posParas[i].second); // look up type info, if exists a type with the name, use it, else throw
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Value argVal = eval(fnArgs.argv[i]);
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TypeInfo actualType = argVal.getTypeInfo();
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if (expectedType != actualType and expectedType != ValueType::Any)
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{
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static constexpr char ArgumentTypeMismatchErrorName[] = "ArgumentTypeMismatchError";
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throw EvaluatorError<ArgumentTypeMismatchErrorName>(FStringView(std::format("In function '{}', argument '{}' expects type '{}', but got type '{}'", fnName.toBasicString(), fnParas.posParas[i].first.toBasicString(), expectedType.toString().toBasicString(), actualType.toString().toBasicString())), currentAddressInfo);
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}
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evaluatedArgs.argv.push_back(argVal);
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}
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// default parameters type check
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for (; i < fnArgs.getLength(); i++)
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{
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size_t defParamIndex = i - fnParas.posParas.size();
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TypeInfo expectedType = fnParas.defParas[defParamIndex].second.first;
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Value defaultVal = eval(fnParas.defParas[defParamIndex].second.second);
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if (expectedType != defaultVal.getTypeInfo() and expectedType != ValueType::Any)
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{
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static constexpr char DefaultParameterTypeErrorName[] = "DefaultParameterTypeError";
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throw EvaluatorError<DefaultParameterTypeErrorName>(FStringView(std::format("In function '{}', default parameter '{}' has type '{}', which does not match the expected type '{}'", fnName.toBasicString(), fnParas.defParas[defParamIndex].first.toBasicString(), defaultVal.getTypeInfo().toString().toBasicString(), expectedType.toString().toBasicString())), currentAddressInfo);
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}
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Value argVal = eval(fnArgs.argv[i]);
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TypeInfo actualType = argVal.getTypeInfo();
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if (expectedType != actualType and expectedType != ValueType::Any)
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{
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static constexpr char ArgumentTypeMismatchErrorName[] = "ArgumentTypeMismatchError";
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throw EvaluatorError<ArgumentTypeMismatchErrorName>(FStringView(std::format("In function '{}', argument '{}' expects type '{}', but got type '{}'", fnName.toBasicString(), fnParas.defParas[defParamIndex].first.toBasicString(), expectedType.toString().toBasicString(), actualType.toString().toBasicString())), currentAddressInfo);
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}
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evaluatedArgs.argv.push_back(argVal);
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}
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// default parameters filling
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for (; i < fnParas.size(); i++)
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{
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size_t defParamIndex = i - fnParas.posParas.size();
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Value defaultVal = eval(fnParas.defParas[defParamIndex].second.second);
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evaluatedArgs.argv.push_back(defaultVal);
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}
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// create new context for function call
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auto newContext = std::make_shared<Context>(FString(std::format("<Function {}()>", fnName.toBasicString())), currentContext);
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auto previousContext = currentContext;
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currentContext = newContext;
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// define parameters in new context
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for (size_t j = 0; j < fnParas.size(); j++)
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{
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FString paramName;
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TypeInfo paramType;
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if (j < fnParas.posParas.size())
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{
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paramName = fnParas.posParas[j].first;
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paramType = fnParas.posParas[j].second;
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}
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else
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{
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size_t defParamIndex = j - fnParas.posParas.size();
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paramName = fnParas.defParas[defParamIndex].first;
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paramType = fnParas.defParas[defParamIndex].second.first;
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}
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AccessModifier argAm = AccessModifier::Const;
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currentContext->def(paramName, paramType, argAm, evaluatedArgs.argv[j]);
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}
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// execute function body
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Value retVal = Value::getNullInstance();
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for (const auto &stmt : fnStruct.body->stmts)
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{
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StatementResult sr = evalStatement(stmt);
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if (sr.shouldReturn())
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{
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retVal = sr.result;
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break;
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}
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}
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currentContext = previousContext;
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if (fnStruct.retType != retVal.getTypeInfo() and fnStruct.retType != ValueType::Any)
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{
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static constexpr char ReturnTypeMismatchErrorName[] = "ReturnTypeMismatchError";
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throw EvaluatorError<ReturnTypeMismatchErrorName>(FStringView(std::format("Function '{}' expects return type '{}', but got type '{}'", fnName.toBasicString(), fnStruct.retType.toString().toBasicString(), retVal.getTypeInfo().toString().toBasicString())), currentAddressInfo);
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}
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return retVal;
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}
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Value Evaluator::eval(Ast::Expression exp)
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{
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using Fig::Ast::AstType;
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switch (exp->getType())
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{
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case AstType::ValueExpr: {
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auto valExp = std::dynamic_pointer_cast<Ast::ValueExprAst>(exp);
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return valExp->val;
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}
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case AstType::VarExpr: {
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auto varExp = std::dynamic_pointer_cast<Ast::VarExprAst>(exp);
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auto val = currentContext->get(varExp->name);
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if (val.has_value())
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{
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return val.value();
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}
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static constexpr char UndefinedVariableErrorName[] = "UndefinedVariableError";
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throw EvaluatorError<UndefinedVariableErrorName>(FStringView(std::format("Variable '{}' is not defined in the current scope", varExp->name.toBasicString())), varExp->getAAI());
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}
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case AstType::BinaryExpr: {
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auto binExp = std::dynamic_pointer_cast<Ast::BinaryExprAst>(exp);
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return evalBinary(binExp);
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}
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case AstType::UnaryExpr: {
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auto unExp = std::dynamic_pointer_cast<Ast::UnaryExprAst>(exp);
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return evalUnary(unExp);
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}
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case AstType::FunctionCall: {
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auto fnCall = std::dynamic_pointer_cast<Ast::FunctionCallExpr>(exp);
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Value calleeVal = eval(fnCall->callee);
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if (!calleeVal.is<Function>())
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{
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static constexpr char NotAFunctionErrorName[] = "NotAFunctionError";
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throw EvaluatorError<NotAFunctionErrorName>(
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FStringView(std::format(
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"'{}' is not a function or callable",
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calleeVal.toString().toBasicString())),
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currentAddressInfo);
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}
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Function fn = calleeVal.as<Function>();
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FString fnName = u8"<anonymous>";
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if (auto var = std::dynamic_pointer_cast<Ast::VarExprAst>(fnCall->callee))
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fnName = var->name; // try to get function name
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return evalFunctionCall(fn, fnCall->arg, fnName);
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}
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case AstType::FunctionLiteralExpr: {
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auto fn = std::dynamic_pointer_cast<Ast::FunctionLiteralExprAst>(exp);
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if (fn->isExprMode())
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{
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Ast::BlockStatement body = std::make_shared<Ast::BlockStatementAst>();
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body->setAAI(fn->getExprBody()->getAAI());
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Ast::Statement retSt = std::make_shared<Ast::ReturnSt>(fn->getExprBody());
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retSt->setAAI(fn->getExprBody()->getAAI());
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body->stmts.push_back(retSt);
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return Function(
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fn->paras,
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ValueType::Any,
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body
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);
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}
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else
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{
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Ast::BlockStatement body = fn->getBlockBody();
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return Function(
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fn->paras,
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ValueType::Any,
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body
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);
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}
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}
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case AstType::ListExpr: {
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auto listexpr = std::dynamic_pointer_cast<Ast::ListExprAst>(exp);
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}
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default:
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throw RuntimeError(FStringView("Unknown expression type:" + std::to_string(static_cast<int>(exp->getType()))));
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return Value::getNullInstance();
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}
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}
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StatementResult Evaluator::evalStatement(const Ast::Statement &stmt)
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{
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using Fig::Ast::AstType;
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switch (stmt->getType())
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{
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case AstType::VarDefSt: {
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auto varDef = std::dynamic_pointer_cast<Ast::VarDefAst>(stmt);
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if (currentContext->contains(varDef->name))
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{
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static constexpr char RedeclarationErrorName[] = "RedeclarationError";
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throw EvaluatorError<RedeclarationErrorName>(FStringView(std::format("Variable '{}' already defined in this scope", varDef->name.toBasicString())), currentAddressInfo);
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}
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Value val;
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TypeInfo varTypeInfo;
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if (varDef->typeName == Parser::varDefTypeFollowed)
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{
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// has expr
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val = eval(varDef->expr);
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varTypeInfo = val.getTypeInfo();
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}
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else if (varDef->expr)
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{
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val = eval(varDef->expr);
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if (varDef->typeName != ValueType::Any.name)
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{
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TypeInfo expectedType(varDef->typeName);
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TypeInfo actualType = val.getTypeInfo();
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if (expectedType != actualType and expectedType != ValueType::Any)
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{
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static constexpr char VariableTypeMismatchErrorName[] = "VariableTypeMismatchError";
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throw EvaluatorError<VariableTypeMismatchErrorName>(FStringView(std::format("Variable '{}' expects type '{}', but got type '{}'", varDef->name.toBasicString(), expectedType.toString().toBasicString(), actualType.toString().toBasicString())), currentAddressInfo);
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}
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}
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}
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else if (!varDef->typeName.empty())
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{
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varTypeInfo = TypeInfo(varDef->typeName); // may throw
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val = Value::defaultValue(varTypeInfo);
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}
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AccessModifier am = (varDef->isPublic ? (varDef->isConst ? AccessModifier::PublicConst : AccessModifier::Public) : (varDef->isConst ? AccessModifier::Const : AccessModifier::Normal));
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currentContext->def(varDef->name, varTypeInfo, am, val);
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return StatementResult::normal();
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}
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case AstType::ExpressionStmt: {
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auto exprSt = std::dynamic_pointer_cast<Ast::ExpressionStmtAst>(stmt);
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eval(exprSt->exp);
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return StatementResult::normal();
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};
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case AstType::BlockStatement: {
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auto blockSt = std::dynamic_pointer_cast<Ast::BlockStatementAst>(stmt);
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auto newContext = std::make_shared<Context>(FString(std::format("<Block {}:{}>", blockSt->getAAI().line, blockSt->getAAI().column)), currentContext);
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auto previousContext = currentContext;
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currentContext = newContext;
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StatementResult lstResult = StatementResult::normal();
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for (const auto &s : blockSt->stmts)
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{
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StatementResult sr = evalStatement(s);
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if (!sr.isNormal())
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{
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lstResult = sr;
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break;
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}
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}
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currentContext = previousContext;
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return lstResult;
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};
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case AstType::FunctionDefSt: {
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auto fnDef = std::dynamic_pointer_cast<Ast::FunctionDefSt>(stmt);
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if (currentContext->contains(fnDef->name))
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{
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static constexpr char RedeclarationErrorName[] = "RedeclarationError";
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throw EvaluatorError<RedeclarationErrorName>(FStringView(std::format("Function '{}' already defined in this scope", fnDef->name.toBasicString())), currentAddressInfo);
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}
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AccessModifier am = (fnDef->isPublic ? AccessModifier::PublicConst : AccessModifier::Const);
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currentContext->def(
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fnDef->name,
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ValueType::Function,
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am,
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Value(Function(
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fnDef->paras,
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TypeInfo(fnDef->retType),
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fnDef->body)));
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return StatementResult::normal();
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};
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case AstType::StructSt: {
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auto stDef = std::dynamic_pointer_cast<Ast::StructDefSt>(stmt);
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if (currentContext->contains(stDef->name))
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{
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static constexpr char RedeclarationErrorName[] = "RedeclarationError";
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throw EvaluatorError<RedeclarationErrorName>(FStringView(std::format("Structure '{}' already defined in this scope", stDef->name.toBasicString())), currentAddressInfo);
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}
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std::vector<Field> fields;
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std::vector<FString> _fieldNames;
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for (Ast::StructDefField field : stDef->fields)
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{
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if (Utils::vectorContains(field.fieldName, _fieldNames))
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{
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static constexpr char RedeclarationErrorName[] = "RedeclarationError";
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throw EvaluatorError<RedeclarationErrorName>(FStringView(std::format("Field '{}' already defined in structure '{}'", field.fieldName.toBasicString(), stDef->name.toBasicString())), currentAddressInfo);
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}
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fields.push_back(Field(field.am, field.fieldName, TypeInfo(field.tiName), field.defaultValueExpr));
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}
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ContextPtr defContext(currentContext);
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AccessModifier am = (stDef->isPublic ? AccessModifier::PublicConst : AccessModifier::Const);
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currentContext->def(
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stDef->name,
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ValueType::StructType,
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am,
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Value(StructType(
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defContext,
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fields)));
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return StatementResult::normal();
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}
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case AstType::VarAssignSt: {
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auto varAssign = std::dynamic_pointer_cast<Ast::VarAssignSt>(stmt);
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if (!currentContext->contains(varAssign->varName))
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{
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static constexpr char VariableNotFoundErrorName[] = "VariableNotFoundError";
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throw EvaluatorError<VariableNotFoundErrorName>(FStringView(std::format("Variable '{}' not defined", varAssign->varName.toBasicString())), currentAddressInfo);
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}
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if (!currentContext->isVariableMutable(varAssign->varName))
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{
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static constexpr char ConstAssignmentErrorName[] = "ConstAssignmentError";
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throw EvaluatorError<ConstAssignmentErrorName>(FStringView(std::format("Cannot assign to constant variable '{}'", varAssign->varName.toBasicString())), currentAddressInfo);
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}
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Value val = eval(varAssign->valueExpr);
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if (currentContext->getTypeInfo(varAssign->varName) != ValueType::Any)
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{
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TypeInfo expectedType = currentContext->getTypeInfo(varAssign->varName);
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TypeInfo actualType = val.getTypeInfo();
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if (expectedType != actualType)
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{
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static constexpr char VariableTypeMismatchErrorName[] = "VariableTypeMismatchError";
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throw EvaluatorError<VariableTypeMismatchErrorName>(FStringView(std::format("assigning: Variable '{}' expects type '{}', but got type '{}'", varAssign->varName.toBasicString(), expectedType.toString().toBasicString(), actualType.toString().toBasicString())), currentAddressInfo);
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}
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}
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currentContext->set(varAssign->varName, val);
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return StatementResult::normal();
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};
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case AstType::IfSt: {
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auto ifSt = std::dynamic_pointer_cast<Ast::IfSt>(stmt);
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Value condVal = eval(ifSt->condition);
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if (condVal.getTypeInfo() != ValueType::Bool)
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{
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static constexpr char ConditionTypeErrorName[] = "ConditionTypeError";
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throw EvaluatorError<ConditionTypeErrorName>(FStringView(u8"If condition must be boolean"), currentAddressInfo);
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}
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if (condVal.as<Bool>().getValue())
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{
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return evalStatement(ifSt->body);
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}
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// else
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for (const auto &elif : ifSt->elifs)
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{
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Value elifCondVal = eval(elif->condition);
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if (elifCondVal.getTypeInfo() != ValueType::Bool)
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{
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static constexpr char ConditionTypeErrorName[] = "ConditionTypeError";
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throw EvaluatorError<ConditionTypeErrorName>(FStringView(u8"Else-if condition must be boolean"), currentAddressInfo);
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}
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if (elifCondVal.as<Bool>().getValue())
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{
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return evalStatement(elif->body);
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}
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}
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if (ifSt->els)
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{
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return evalStatement(ifSt->els->body);
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}
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return StatementResult::normal();
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};
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case AstType::WhileSt: {
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auto whileSt = std::dynamic_pointer_cast<Ast::WhileSt>(stmt);
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while (true)
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{
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Value condVal = eval(whileSt->condition);
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if (condVal.getTypeInfo() != ValueType::Bool)
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{
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static constexpr char ConditionTypeErrorName[] = "ConditionTypeError";
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throw EvaluatorError<ConditionTypeErrorName>(FStringView(u8"While condition must be boolean"), currentAddressInfo);
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}
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if (!condVal.as<Bool>().getValue())
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|
{
|
|
break;
|
|
}
|
|
StatementResult sr = evalStatement(whileSt->body);
|
|
if (sr.shouldReturn())
|
|
{
|
|
return sr;
|
|
}
|
|
if (sr.shouldBreak())
|
|
{
|
|
break;
|
|
}
|
|
if (sr.shouldContinue())
|
|
{
|
|
continue;
|
|
}
|
|
}
|
|
return StatementResult::normal();
|
|
};
|
|
case AstType::ReturnSt: {
|
|
if (!currentContext->parent)
|
|
{
|
|
static constexpr char ReturnOutsideFunctionErrorName[] = "ReturnOutsideFunctionError";
|
|
throw EvaluatorError<ReturnOutsideFunctionErrorName>(FStringView(u8"'return' statement outside function"), currentAddressInfo);
|
|
}
|
|
std::shared_ptr<Context> fc = currentContext;
|
|
while (fc->parent)
|
|
{
|
|
if (fc->getScopeName().find(u8"<Function ") == 0)
|
|
{
|
|
break;
|
|
}
|
|
fc = fc->parent;
|
|
}
|
|
if (fc->getScopeName().find(u8"<Function ") != 0)
|
|
{
|
|
static constexpr char ReturnOutsideFunctionErrorName[] = "ReturnOutsideFunctionError";
|
|
throw EvaluatorError<ReturnOutsideFunctionErrorName>(FStringView(u8"'return' statement outside function"), currentAddressInfo);
|
|
}
|
|
auto returnSt = std::dynamic_pointer_cast<Ast::ReturnSt>(stmt);
|
|
return StatementResult::returnFlow(eval(returnSt->retValue));
|
|
};
|
|
default:
|
|
throw RuntimeError(FStringView(std::string("Unknown statement type:") + magic_enum::enum_name(stmt->getType()).data()));
|
|
}
|
|
return StatementResult::normal();
|
|
}
|
|
|
|
void Evaluator::run()
|
|
{
|
|
for (auto ast : asts)
|
|
{
|
|
currentAddressInfo = ast->getAAI();
|
|
if (std::dynamic_pointer_cast<Ast::ExpressionStmtAst>(ast))
|
|
{
|
|
auto exprAst = std::dynamic_pointer_cast<Ast::ExpressionStmtAst>(ast);
|
|
Ast::Expression exp = exprAst->exp;
|
|
eval(exp);
|
|
}
|
|
else if (dynamic_cast<Ast::StatementAst *>(ast.get()))
|
|
{
|
|
auto stmtAst = std::dynamic_pointer_cast<Ast::StatementAst>(ast);
|
|
evalStatement(stmtAst);
|
|
}
|
|
else
|
|
{
|
|
throw RuntimeError(FStringView(u8"Unknown AST type"));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Evaluator::printStackTrace() const
|
|
{
|
|
if (currentContext)
|
|
currentContext->printStackTrace();
|
|
else
|
|
std::cerr << "[STACK TRACE] (No context has been loaded)\n";
|
|
}
|
|
} // namespace Fig
|