#ifndef SCOPE_H#define SCOPE_Htypedef struct scope Scope;#include "declaration.h"Scope		*new_scope(void);			/* Start a new scope. The parent of that scope will			 * be current_scope			 */void		leave_scope(void);			/* Set current scope to current_scope->parent */void		delete_scope(Scope *);void		declare(const char *key, Declaration *decl);			/* Link the string 'key' to the declaration 'decl',			 * in current_scope! When 'key' already exists in			 * current_scope, error() is called with an			 * appropriate message.			 */Declaration	*lookup(const Scope *, const char *key);			/* Lookup 'key' in the specified scope and in its			 * parent scopes. When found, return the Declaration			 * it is linked to. The first match (inner most scope)			 * is returned.			 */Declaration	*lookup_in_this_scope(const Scope *, const char *key);			/* As lookup(), but just search this one scope. */extern Scope	*current_scope, *global_scope;			/* global_scope is the outer most scope, containing			 * the global Asterix declarations. current_scope is			 * used during parsing and points to the current scope			 * at the point in the Asterix source that the parser			 * is currently processing.			 */#endif