c-repl/src/memory.cpp

#include "include/memory.h"
using namespace std;

Memory::Memory(void) {
    scopes.emplace_back();
    scopes.back().depth = 0;
}

bool Memory::contains(string identifier) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) return true;
    }
    
    return false;
}

bool Memory::contains_top(string identifier) {
    Scope& top = scopes.back();
    return top.vars.contains(identifier);
}

void Memory::add_scope(ScopeType type) {
    Scope& top = scopes.back();
    scopes.emplace_back();
    scopes.back().depth = top.depth + 1;
    scopes.back().type = type;
}

void Memory::remove_scope(void) {
    scopes.pop_back();
}

MemoryVar& Memory::get(string identifier) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) return scope.vars[identifier];
    }
    
    throw exception();
}

void Memory::declare(string identifier, Type type) {
    Scope& top = scopes.back();
    top.vars[identifier].type = type;
}

void Memory::update(string identifier, EvalResult value) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) {
            scope.vars[identifier].value = value;
            scope.vars[identifier].initialized = true;
            return;
        }
    }
    
    throw exception();
}

Scope& Memory::_debug_top(void) {
    Scope& top = scopes.back();
    return top;
}

void _debug_print_memory_var(MemoryVar var) {
    if (var.initialized && !holds_alternative<monostate>(var.value)) {
        cout << " ";
        if (holds_alternative<int>(var.value)) {
            cout << get<int>(var.value);
        } else if (holds_alternative<double>(var.value)) {
            cout << get<double>(var.value);
        } else {
            cout << "{Unsupported}";
        }
    } else {
        cout << setw (5) << "{}";
    }
}

const char* _debug_type_names[] = {
    "Int", "Double"
};

void _debug_print_scope(Scope scope) {
    for (auto it : scope.vars) {
        if (it.first.length() > 6) {
            cout << it.first.substr(0, 6) << "..";
        } else {
            cout << setw (6) << it.first << "  ";
        }
        cout << "|";
        cout << setw (7) << _debug_type_names[int(it.second.type)] << " |";
        
        _debug_print_memory_var(it.second);
        cout << endl;
    }
}

void Memory::_debug_print(void) {
    cout << BOLD "  Name  |  Type  |  Value" RESET << endl;
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (rit != scopes.rbegin()) {
            cout << "   ---  New Scope  ---" << endl;
        }

        _debug_print_scope(scope);
    }
}