227 lines
7.9 KiB
C++
227 lines
7.9 KiB
C++
#pragma once
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#include <memory>
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#include <stdexcept>
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#include <string>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "tools.h"
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class ScopeBase {
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friend class Visitor;
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friend class LocalScope;
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friend class MemberFunctionScope;
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friend class FunctionScope;
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friend class ClassDefScope;
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friend class GlobalScope;
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friend class ASTSemanticCheckVisitor;
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protected:
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ScopeBase *parent; // cannot use std::shared_ptr<ScopeBase> because of circular dependency
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virtual bool VariableNameAvailable(const std::string &name, int ttl) = 0;
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virtual bool add_variable(const std::string &name, const ExprTypeInfo &type) = 0;
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virtual ExprTypeInfo fetch_varaible(const std::string &name) = 0;
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static inline bool IsKeyWord(const std::string &name) {
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static const std::unordered_set<std::string> keywords = {"void", "bool", "int", "string", "new", "class",
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"null", "true", "false", "this", "if", "else",
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"for", "while", "break", "continue", "return"};
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return keywords.find(name) != keywords.end();
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}
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};
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class LocalScope : public ScopeBase {
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friend class Visitor;
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std::unordered_map<std::string, ExprTypeInfo> local_variables;
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bool add_variable(const std::string &name, const ExprTypeInfo &type) override {
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if (!VariableNameAvailable(name, 0)) {
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return false;
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}
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if (std::holds_alternative<IdentifierType>(type) && std::get<IdentifierType>(type) == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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if (std::holds_alternative<ArrayType>(type) && std::get<ArrayType>(type).has_base_type &&
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std::get<ArrayType>(type).basetype == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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local_variables[name] = type;
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return true;
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}
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virtual ExprTypeInfo fetch_varaible(const std::string &name) override {
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if (local_variables.find(name) != local_variables.end()) {
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return local_variables[name];
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}
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return parent->fetch_varaible(name);
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}
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bool VariableNameAvailable(const std::string &name, int ttl) override {
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if (ttl == 0 && IsKeyWord(name)) {
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return false;
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}
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if (ttl == 0) {
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if (local_variables.find(name) != local_variables.end()) {
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return false;
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}
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}
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return parent->VariableNameAvailable(name, ttl + 1);
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}
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};
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struct FunctionSchema {
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friend class Visitor;
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ExprTypeInfo return_type;
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std::vector<std::pair<ExprTypeInfo, std::string>> arguments;
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};
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class FunctionScope : public ScopeBase {
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friend std::shared_ptr<class Program_ASTNode> CheckAndDecorate(std::shared_ptr<class Program_ASTNode> src);
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friend class Visitor;
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friend class ASTSemanticCheckVisitor;
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FunctionSchema schema;
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bool add_variable([[maybe_unused]] const std::string &name, [[maybe_unused]] const ExprTypeInfo &type) override {
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throw std::runtime_error("FunctionScope does not support add_variable");
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}
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virtual ExprTypeInfo fetch_varaible(const std::string &name) override {
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for (const auto &arg : schema.arguments) {
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if (arg.second == name) {
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return arg.first;
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}
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}
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return parent->fetch_varaible(name);
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}
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bool VariableNameAvailable(const std::string &name, int ttl) override {
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if (ttl == 0 && IsKeyWord(name)) {
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return false;
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}
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if (ttl == 1) {
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for (const auto &arg : schema.arguments) {
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if (arg.second == name) {
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return false;
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}
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}
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}
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return parent->VariableNameAvailable(name, ttl + 1);
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}
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};
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class ClassDefScope : public ScopeBase {
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friend class Visitor;
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std::unordered_map<std::string, ExprTypeInfo> member_variables;
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std::unordered_map<std::string, std::shared_ptr<FunctionScope>> member_functions;
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bool add_variable(const std::string &name, const ExprTypeInfo &type) override {
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if (!VariableNameAvailable(name, 0)) {
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return false;
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}
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if (std::holds_alternative<IdentifierType>(type) && std::get<IdentifierType>(type) == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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if (std::holds_alternative<ArrayType>(type) && std::get<ArrayType>(type).has_base_type &&
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std::get<ArrayType>(type).basetype == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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member_variables[name] = type;
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return true;
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}
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virtual ExprTypeInfo fetch_varaible(const std::string &name) override {
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if (member_variables.find(name) != member_variables.end()) {
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return member_variables[name];
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}
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return parent->fetch_varaible(name);
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}
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bool add_function(const std::string &name, std::shared_ptr<FunctionScope> ptr) {
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if (IsKeyWord(name)) return false;
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if (member_variables.find(name) != member_variables.end()) {
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return false;
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}
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if (member_functions.find(name) != member_functions.end()) {
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return false;
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}
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member_functions[name] = ptr;
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return true;
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}
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bool VariableNameAvailable(const std::string &name, int ttl) override {
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if (ttl == 0 && IsKeyWord(name)) {
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return false;
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}
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if (ttl == 0) {
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if (member_variables.find(name) != member_variables.end()) {
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return false;
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}
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}
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if (ttl == 0) {
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if (member_functions.find(name) != member_functions.end()) {
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return false;
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}
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}
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return parent->VariableNameAvailable(name, ttl + 1);
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}
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};
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class GlobalScope : public ScopeBase {
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friend class Visitor;
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friend class ASTSemanticCheckVisitor;
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friend std::shared_ptr<class Program_ASTNode> CheckAndDecorate(std::shared_ptr<class Program_ASTNode> src);
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std::unordered_map<std::string, ExprTypeInfo> global_variables;
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std::unordered_map<std::string, std::shared_ptr<FunctionScope>> global_functions;
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std::unordered_map<std::string, std::shared_ptr<ClassDefScope>> classes;
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bool add_class(const std::string &name, std::shared_ptr<ClassDefScope> ptr) {
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if (IsKeyWord(name)) return false;
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if (classes.find(name) != classes.end()) {
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return false;
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}
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if (global_functions.find(name) != global_functions.end()) {
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return false;
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}
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if (global_variables.find(name) != global_variables.end()) {
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return false;
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}
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classes[name] = ptr;
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return true;
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}
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bool add_function(const std::string &name, std::shared_ptr<FunctionScope> ptr) {
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if (IsKeyWord(name)) return false;
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if (classes.find(name) != classes.end()) {
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return false;
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}
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if (global_functions.find(name) != global_functions.end()) {
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return false;
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}
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if (global_variables.find(name) != global_variables.end()) {
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return false;
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}
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global_functions[name] = ptr;
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return true;
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}
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bool add_variable(const std::string &name, const ExprTypeInfo &type) override {
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if (!VariableNameAvailable(name, 0)) {
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return false;
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}
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if (std::holds_alternative<IdentifierType>(type) && std::get<IdentifierType>(type) == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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if (std::holds_alternative<ArrayType>(type) && std::get<ArrayType>(type).has_base_type &&
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std::get<ArrayType>(type).basetype == "void") {
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throw SemanticError("Variable cannot be void", 1);
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}
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global_variables[name] = type;
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return true;
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}
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bool VariableNameAvailable(const std::string &name, [[maybe_unused]] int ttl) override {
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if (ttl == 0 && IsKeyWord(name)) {
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return false;
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}
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if (ttl == 0) {
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if (global_variables.find(name) != global_variables.end()) {
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return false;
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}
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}
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// if (classes.find(name) != classes.end()) {
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// return false;
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// }
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if (global_functions.find(name) != global_functions.end()) {
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return false;
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}
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return true;
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}
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virtual ExprTypeInfo fetch_varaible(const std::string &name) override {
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if (global_variables.find(name) != global_variables.end()) {
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return global_variables[name];
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}
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throw SemanticError("Variable " + name + " not found", 1);
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}
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public:
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GlobalScope() { parent = nullptr; }
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}; |