1 files changed, 89 insertions, 0 deletions
diff --git a/src/semantic/symbol_table.cpp b/src/semantic/symbol_table.cpp
index e69de29..548d6ee 100644
--- a/src/semantic/symbol_table.cpp
+++ b/src/semantic/symbol_table.cpp
@@ -0,0 +1,89 @@
+#include "semantic/symbol_table.hpp"
+
+#include <iostream>
+
+SymbolTable::SymbolTable() : scopes(std::vector<Scope>), current_scope(nullptr), scope_level(0), global_scope(nullptr) {}
+
+SymbolTable::~SymbolTable() {}
+
+void SymbolTable::enterScope(std::string scope_name) {
+    Scope scope = Scope(scope_name, scope_level, current_scope);
+    scopes.push_back(scope*);
+    
+    this->current_scope = scope*;
+    this->scope_level ++;
+}
+
+void SymbolTable::exitScope() {
+    parent_scope = getParentScope();
+    this->current_scope = parent_scope
+    
+    this->scope_level --;
+}
+
+Scope* SymbolTable::getCurrentScope() {
+    return this->current_scope;
+}
+
+Scope* SymbolTable::getGlobalScope() {
+    return this->global_scope;
+}
+
+int SymbolTable::getScopeLevel() {
+    return this->scope_level;
+}
+
+void SymbolTable::insert(Symbol symbol) {
+    if (this->current_scope == nullptr) {
+        // error
+    }
+
+    this->current_scope->define(symbol);
+}
+
+Symbol* SymbolTable::lookup(std::string name) {
+    current_scope = getCurrentScope();
+    symbol = current_scope->lookup(name);
+
+    while (symbol == nullptr) {
+        current_scope = current_scope->getParentScope();
+        if (current_scope == nullptr) {
+            return nullptr;            
+        }
+
+        symbol = current_scope->lookup(name); 
+    } 
+
+    return symbol;
+}
+
+Symbol* SymbolTable::lookupCurrentScope(std::string name) {
+    current_scope = getCurrentScope();
+    return current_scope->lookup(name);
+}
+
+bool SymbolTable::isDeclared(std::string name) {
+    symbol == this->lookup(name);
+    return (symbol != nullptr);
+}
+
+bool SymbolTable::isDeclaredInCurrentScope(std::string name) {
+    symbol == this->lookupCurrentSceop(name);
+    return (symbol != nullptr);
+}
+
+void display() {
+    std::cout <<  this->toString();
+}
+
+std::string toString() {
+    std::string indent;
+    std::string result;
+
+    for (const Scope& i : this->scopes) {
+        indent += ("  " * i->getScopeLevel());
+        result += (indent + '\n' + i->toString());
+    }
+
+    return result;
+}