From 679e36686bdd4a07bba963b683acb01e0c181e3d Mon Sep 17 00:00:00 2001
From: Valk Richard Li <48872266+ValKmjolnir@users.noreply.github.com>
Date: Tue, 28 Jan 2020 23:17:34 +0800
Subject: [PATCH] update

---
 version2.0/nasal.h       |   1 +
 version2.0/nasal_scope.h | 135 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 136 insertions(+)
 create mode 100644 version2.0/nasal_scope.h

diff --git a/version2.0/nasal.h b/version2.0/nasal.h
index 1a43514..944b54f 100644
--- a/version2.0/nasal.h
+++ b/version2.0/nasal.h
@@ -11,6 +11,7 @@
 #include <stack>
 
 #include "numeral_misc.h"
+#include "nasal_scope.h"
 #include "nasal_enum.h"
 #include "abstract_syntax_tree.h"
 #include "nasal_lexer.h"
diff --git a/version2.0/nasal_scope.h b/version2.0/nasal_scope.h
new file mode 100644
index 0000000..e746002
--- /dev/null
+++ b/version2.0/nasal_scope.h
@@ -0,0 +1,135 @@
+#ifndef __NASAL_SCOPE_H__
+#define __NASAL_SCOPE_H__
+
+struct symbol_table_unit
+{
+    std::string symbol_name;
+    int symbol_number;
+    int symbol_line;
+    symbol_table_unit(const symbol_table_unit& tmp)
+    {
+        symbol_name=tmp.symbol_name;
+        symbol_number=tmp.symbol_number;
+        symbol_line=tmp.symbol_line;
+        return;
+    }
+    symbol_table_unit& operator=(const symbol_table_unit& tmp)
+    {
+        symbol_line=tmp.symbol_line;
+        symbol_name=tmp.symbol_name;
+        symbol_number=tmp.symbol_number;
+        return *this;
+    }
+};
+
+class nasal_scope
+{
+    private:
+        int error;
+        std::list<symbol_table_unit> main_scope;
+        std::list<std::list<symbol_table_unit> > block_list;
+    public:
+        nasal_scope();
+        ~nasal_scope();
+        void print_symbol_table();
+        void set_scope_clear();
+        void main_scope_add_symbol(symbol_table_unit);
+        void block_list_add_scope();
+        void block_list_del_scope();
+        void block_scope_add_symbol(symbol_table_unit);
+};
+
+nasal_scope::nasal_scope()
+{
+    error=0;
+    main_scope.clear();
+    block_list.clear();
+    return;
+}
+
+nasal_scope::~nasal_scope()
+{
+    error=0;
+    main_scope.clear();
+    block_list.clear();
+    return;
+}
+
+void nasal_scope::print_symbol_table()
+{
+    std::cout<<"main scope:"<<std::endl;
+    if(!main_scope.empty())
+        for(std::list<symbol_table_unit>::iterator i=main_scope.begin();i!=main_scope.end();++i)
+            std::cout<<"line "<<i->symbol_line<<": "<<i->symbol_name<<" |symbol number: "<<i->symbol_number<<'.'<<std::endl;
+    else
+        std::cout<<"empty main scope."<<std::endl;
+    std::cout<<"block scope:"<<std::endl;
+    if(!block_list.empty())
+    {
+        for(std::list<std::list<symbol_table_unit> >::iterator i=block_list.begin();i!=block_list.end();++i)
+        {
+            for(std::list<symbol_table_unit>::iterator j=i->begin();j!=i->end();++j)
+                std::cout<<"line "<<j->symbol_line<<": "<<j->symbol_name<<" |symbol number: "<<j->symbol_number<<'.'<<std::endl;
+        } 
+    }
+    else
+        std::cout<<"empty block scope."<<std::endl;
+    return;
+}
+
+void nasal_scope::set_scope_clear()
+{
+    error=0;
+    main_scope.clear();
+    block_list.clear();
+    return;
+}
+
+void nasal_scope::main_scope_add_symbol(symbol_table_unit tmp)
+{
+    int symbol_number_gen=0;
+    if(!main_scope.empty())
+        symbol_number_gen=main_scope.back().symbol_number;
+    tmp.symbol_number=symbol_number_gen+1;
+    main_scope.push_back(tmp);
+    return;
+}
+
+void nasal_scope::block_list_add_scope()
+{
+    std::list<symbol_table_unit> new_scope;
+    block_list.push_back(new_scope);
+    return;
+}
+
+void nasal_scope::block_list_del_scope()
+{
+    if(block_list.empty())
+    {
+        ++error;
+        std::cout<<">>[Symbol-error] fatal error: empty block_scope_list."<<std::endl;
+    }
+    else
+        block_list.pop_back();
+    return;
+}
+
+void nasal_scope::block_scope_add_symbol(symbol_table_unit tmp)
+{
+    if(!block_list.empty())
+    {
+        int symbol_number_gen=0;
+        if(!block_list.back().empty())
+            symbol_number_gen=block_list.back().back().symbol_number;
+        tmp.symbol_number=symbol_number_gen+1;
+        block_list.back().push_back(tmp);
+    }
+    else
+    {
+        ++error;
+        std::cout<<">>[Symbol-error] fatal error: empty block_scope_list."<<std::endl;
+    }
+    return;
+}
+
+#endif
\ No newline at end of file