First commit, porting from PaCO

scope.cpp

@@ -0,0 +1,50 @@
+#include "scope.h"
+#include <vector>
+#include "heap.h"
+
+struct t_variable {
+	//char	name[MAX_IDENTIFIER_LENGTH];
+    std::string name;
+	int		    type;
+	int 	    length;
+	int 	    address;
+};
+
+struct t_struct {
+	//char		name[MAX_IDENTIFIER_LENGTH];
+    std::string             name;
+	std::vector<t_variable> members;
+};
+
+struct t_scope {
+    std::vector<t_variable> variables;
+    t_scope*                parent_scope;
+};
+
+static t_scope scope_global;
+static t_scope* scope_current = &scope_global; 
+
+void scope_init() {
+    scope_current = &scope_global;
+    scope_global.variables.clear();
+}
+
+void scope_open_local() {
+    t_scope* new_scope = new t_scope;
+    new_scope->parent_scope = scope_current;
+    scope_current = new_scope;
+}
+
+void scope_close_local() {
+    t_scope* closing_scope = scope_current;
+    scope_current = scope_current->parent_scope;
+    delete closing_scope;
+}
+
+const int scope_declare_variable(const std::string name, const int type, const int length) {
+    for (t_variable v : scope_current->variables) { if (v.name == name) return -1; }
+    const int address = heap_get_address();
+    const t_variable var {name, type, length, address};
+    scope_current->variables.push_back(var);
+    return address;
+}