From 25a65484bfed6eccf7af52072dd48faacd809649 Mon Sep 17 00:00:00 2001
From: Amazing Coder <wcadaydayup@gmail.com>
Date: Thu, 29 Aug 2024 20:50:38 +0800
Subject: [PATCH 1/4] v9.0-support to handle python assignment statements.

---
 README.md                    |  12 ++
 ast.py => abs_syntax_tree.py |  29 ++++-
 assignments.txt              |   5 +
 ast_v9.png                   | Bin 0 -> 40699 bytes
 func_test.py                 |  59 ++++++++++
 genastdot.py                 |  54 ++++++---
 interpreter.py               | 214 +++++++++++++++++++++++++----------
 sip_token.py                 |  22 ++++
 8 files changed, 318 insertions(+), 77 deletions(-)
 rename ast.py => abs_syntax_tree.py (66%)
 create mode 100644 assignments.txt
 create mode 100644 ast_v9.png
 create mode 100644 func_test.py
 create mode 100644 sip_token.py

diff --git a/README.md b/README.md
index 1af3c5b..26d2225 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,15 @@ support unary operators (+, -)
  python genastdot.py "5---2" > ast.dot && dot -Tpng -o ast_v8.png ast.dot    
 ```
 ![ast_v8.png](ast_v8.png)
+
+
+### v9.0 
+support to handle python assignment statements.
+
+```shell
+python interpreter.py assignments.txt
+```
+
+```shell
+python genastdot.py assignments.txt > ast.dot && dot -Tpng -o ast_v9.png ast.dot  
+```
\ No newline at end of file
diff --git a/ast.py b/abs_syntax_tree.py
similarity index 66%
rename from ast.py
rename to abs_syntax_tree.py
index 9450aa3..73d7a25 100644
--- a/ast.py
+++ b/abs_syntax_tree.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 """
-@file: ast.py
+@file: abs_syntax_tree.py
 @author: amazing coder
 @date: 2024/8/28
 @desc: abstract-syntax tree (AST) 抽象语法树节点定义
@@ -14,7 +14,7 @@
 """
 
 
-class  AST(object):
+class AST(object):
     """
     ASTs represent the operator-operand model.
     每一个 AST 节点都代表一个运算符和一个操作数
@@ -51,3 +51,28 @@ class UnaryOp(AST):
     def __init__(self, op, expr):
         self.token = self.op = op
         self.expr = expr
+
+class Assign(AST):
+    """
+    赋值运算符节点，也是非叶子节点，代表一个赋值运算符
+    比如 a = 2 这个表达式，a 是变量，2是值， 都是叶子节点，= 是赋值运算符节点
+    """
+    def __init__(self, left, op, right):
+        self.left = left
+        self.token = self.op = op
+        self.right = right
+
+class Var(AST):
+    """
+    变量节点，也是叶子节点，代表一个变量
+    """
+    def __init__(self, token):
+        self.token = token
+        self.value = token.value
+
+class NoOp(AST):
+    pass
+
+class Compound(AST):
+    def __init__(self):
+        self.children = []
\ No newline at end of file
diff --git a/assignments.txt b/assignments.txt
new file mode 100644
index 0000000..46895eb
--- /dev/null
+++ b/assignments.txt
@@ -0,0 +1,5 @@
+a=1
+b=2
+c=a+b
+d=a+b-c
+e=45+d
\ No newline at end of file
diff --git a/ast_v9.png b/ast_v9.png
new file mode 100644
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diff --git a/func_test.py b/func_test.py
new file mode 100644
index 0000000..1c89ab0
--- /dev/null
+++ b/func_test.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+@file: func_test.py
+@author: amazing coder
+@date: 2024/8/29
+@desc: 
+"""
+from sip_token import Token
+from abs_syntax_tree import Num, BinOp, UnaryOp
+from interpreter import Analyzer, Parser, Interpreter, INTEGER, MINUS
+
+def test_unary_op():
+    """
+    测试一元运算符, text=6---1
+    """
+    text = '5---2'
+    six_tok = Num(Token(INTEGER, 5))
+    one_tok =  Num(Token(INTEGER, 2))
+    minus_tok = Token(MINUS, '-')
+    exp_node = BinOp(six_tok, minus_tok, UnaryOp(minus_tok, UnaryOp(minus_tok, one_tok)))
+    interpreter = Interpreter(None)
+    print(interpreter.visit(exp_node))
+
+def test_analyzer():
+    """
+    测试语法分析器
+    """
+    text = "a=45"
+    print(text)
+    analyzer = Analyzer(text)
+    token = analyzer.get_next_token()
+    while token.type != 'EOF':
+        print(token)
+        token = analyzer.get_next_token()
+
+def test_interpret_py_statements():
+    """
+    测试解释器
+    """
+    text = """a=1
+    b=2
+    c=a+b
+    d=a+b+c
+    e=45
+    """
+    print(text)
+    print(repr(text))
+    analyzer = Analyzer(text)
+    parser = Parser(analyzer)
+    interpreter = Interpreter(parser)
+    interpreter.interpret()
+    print(interpreter.GLOBAL_SCOPE)
+
+
+
+if __name__ == '__main__':
+    test_interpret_py_statements()
\ No newline at end of file
diff --git a/genastdot.py b/genastdot.py
index 20be6c3..9fd8895 100644
--- a/genastdot.py
+++ b/genastdot.py
@@ -1,13 +1,3 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-"""
-@file: genastdot.py
-@author: amazing coder
-@date: 2024/8/28
-@desc: 
-"""
-
 ###############################################################################
 #  AST visualizer - generates a DOT file for Graphviz.                        #
 #                                                                             #
@@ -63,6 +53,43 @@ def visit_UnaryOp(self, node):
         s = '  node{} -> node{}\n'.format(node._num, node.expr._num)
         self.dot_body.append(s)
 
+    def visit_Compound(self, node):
+        s = '  node{} [label="Compound"]\n'.format(self.ncount)
+        self.dot_body.append(s)
+        node._num = self.ncount
+        self.ncount += 1
+
+        for child in node.children:
+            self.visit(child)
+            s = '  node{} -> node{}\n'.format(node._num, child._num)
+            self.dot_body.append(s)
+
+    def visit_Assign(self, node):
+        s = '  node{} [label="{}"]\n'.format(self.ncount, node.op.value)
+        self.dot_body.append(s)
+        node._num = self.ncount
+        self.ncount += 1
+
+        self.visit(node.left)
+        self.visit(node.right)
+
+        for child_node in (node.left, node.right):
+            s = '  node{} -> node{}\n'.format(node._num, child_node._num)
+            self.dot_body.append(s)
+
+    def visit_Var(self, node):
+        s = '  node{} [label="{}"]\n'.format(self.ncount, node.value)
+        self.dot_body.append(s)
+        node._num = self.ncount
+        self.ncount += 1
+
+    def visit_NoOp(self, node):
+        s = '  node{} [label="NoOp"]\n'.format(self.ncount)
+        self.dot_body.append(s)
+        node._num = self.ncount
+        self.ncount += 1
+
+
     def gendot(self):
         tree = self.parser.parse()
         self.visit(tree)
@@ -74,11 +101,12 @@ def main():
         description='Generate an AST DOT file.'
     )
     argparser.add_argument(
-        'text',
-        help='Arithmetic expression (in quotes): "1 + 2 * 3"'
+        'fname',
+        help='Pascal source file'
     )
     args = argparser.parse_args()
-    text = args.text
+    fname = args.fname
+    text = open(fname, 'r').read()
 
     lexer = Analyzer(text)
     parser = Parser(lexer)
diff --git a/interpreter.py b/interpreter.py
index 636e5fd..131eff9 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -14,25 +14,16 @@
 v6.0 : support to evaluates arithmetic expressions that have different operators and parentheses.
 v7.0 : using ASTs represent the operator-operand model of arithmetic expressions.
 v8.0 : support unary operators (+, -)
+v9.0 : support to handle python assignment statements.
 """
 
-from ast import BinOp, Num, UnaryOp
+import keyword
+from abs_syntax_tree import BinOp, Num, UnaryOp, Var, NoOp, Compound, Assign
+from sip_token import Token
 
-INTEGER, PLUS, EOF, MINUS, MUL, DIV, LPAREN, RPAREN = 'INTEGER', 'PLUS', 'EOF', 'MINUS', 'MUL', 'DIV', 'LPAREN', 'RPAREN'
 
-class Token(object):
-    def __init__(self, type, value):
-        self.type = type
-        self.value = value
-
-    def __str__(self):
-        return 'Token({type}, {value})'.format(
-            type=self.type,
-            value=repr(self.value)
-        )
-
-    def __repr__(self):
-         return self.__str__()
+INTEGER, PLUS, EOF, MINUS, MUL, DIV, LPAREN, RPAREN, ID, ASSIGN, REPL = 'INTEGER', 'PLUS', 'EOF', 'MINUS', 'MUL', 'DIV', 'LPAREN', 'RPAREN', 'ID', 'ASSIGN', 'REPL'
+PYTHON_RESERVED_KEYWORDS = {key: Token(key, key) for key in keyword.kwlist}
 
 class Analyzer(object):
     """Lexical analyzer 表达式的语法解析器，用于将表达式解析成token流"""
@@ -42,7 +33,7 @@ def __init__(self, text):
         self.current_char = self.text[self.pos]
 
     def error(self):
-        return Exception("Invalid input")
+        return SyntaxError("invalid syntax")
 
     def advance(self):
         """Advance the 'pos' pointer and set the 'current_char' variable."""
@@ -54,9 +45,16 @@ def advance(self):
 
     def skip_whitespace(self):
         """Skip whitespace, tab, newline."""
-        while self.current_char is not None and self.current_char == ' ':
+        while self.current_char is not None and self.current_char.isspace():
             self.advance()
 
+    def peek(self):
+        peek_pos = self.pos + 1
+        if peek_pos > len(self.text) - 1:
+            return None
+        else:
+            return self.text[peek_pos]
+
     def integer(self):
         """return a multi-digit integer"""
         result = ''
@@ -65,6 +63,17 @@ def integer(self):
             self.advance()
         return int(result)
 
+    def identifier(self):
+        """return a multi-digit identifier"""
+        result = ''
+        while self.current_char is not None and self.current_char.isalnum():
+            result += self.current_char
+            self.advance()
+
+        if result in PYTHON_RESERVED_KEYWORDS:
+            return self.error()
+        return Token(ID, result)
+
     def get_next_token(self):
         """this function breaking a sentence apart into tokens."""
         while self.current_char is not None:
@@ -91,6 +100,15 @@ def get_next_token(self):
             if self.current_char == ')':
                 self.advance()
                 return Token(RPAREN, ')')
+            if self.current_char.isalpha():
+                return self.identifier()
+            if self.current_char == '=':
+                self.advance()
+                return Token(ASSIGN, '=')
+            if self.current_char == '\\' and self.peek() == 'n':
+                self.advance()
+                self.advance()
+                return Token(REPL, '\\n')
 
             self.error()
         return Token(EOF, None)
@@ -125,25 +143,62 @@ def term(self):
             node = BinOp(left=node, op=token, right=self.factor())
         return node
 
-    def factor(self):
-        """返回参与运算的数，支持整型或者带括号的表达式 INTEGER | LPAREN expr RPAREN | (PLUS|MINUS) factor"""
+    def variable(self):
+        node = Var(self.current_token)
+        self.eat(ID)
+        return node
+
+    def empty(self):
+        return NoOp()
+
+    def assignment_statement(self):
+        """
+        assignment_statement : variable ASSIGN expr
+        """
+        left = self.variable()
         token = self.current_token
-        if self.current_token.type == PLUS:
-            self.eat(PLUS)
-            return UnaryOp(op=token, expr=self.factor())
-        elif self.current_token.type == MINUS:
-            self.eat(MINUS)
-            return UnaryOp(op=token, expr=self.factor())
-        elif self.current_token.type == INTEGER:
-            self.eat(INTEGER)
-            return Num(token)
-        elif self.current_token.type == LPAREN:
-            self.eat(LPAREN)
-            node = self.expr()
-            self.eat(RPAREN)
-            return node
+        self.eat(ASSIGN)
+        right = self.expr()
+        node = Assign(left=left, op=token, right=right)
+        return node
+
+    def statement(self):
+        """statement : assignment_statement | empty"""
+        if self.current_token.type == ID:
+            node = self.assignment_statement()
         else:
-            self.error()
+            node = self.empty()
+        return node
+
+    def statements(self):
+        """
+        statements : statement
+                   | statement REPL statement_list
+        """
+        node = self.statement()
+        results = [node]
+        while self.current_token.type == ID:
+            results.append(self.statement())
+
+        return results
+
+    def compound_statement(self):
+        """
+        compound_statement : statement_list
+        """
+        # self.eat(REPL)
+        nodes = self.statements()
+        # self.eat(REPL)
+
+        root = Compound()
+        for node in nodes:
+            root.children.append(node)
+        return root
+
+    def program(self):
+        """program : compound_statement """
+        node = self.compound_statement()
+        return node
 
     def expr(self):
         """表达式解析：term((PLUS|MINUS) term)* .
@@ -161,8 +216,34 @@ def expr(self):
             node = BinOp(left=node, op=token, right=self.term())
         return node
 
+    def factor(self):
+        """返回参与运算的数，支持整型或者带括号的表达式 INTEGER | LPAREN expr RPAREN | (PLUS|MINUS) factor | variable"""
+        token = self.current_token
+        if self.current_token.type == PLUS:
+            self.eat(PLUS)
+            return UnaryOp(op=token, expr=self.factor())
+        elif self.current_token.type == MINUS:
+            self.eat(MINUS)
+            return UnaryOp(op=token, expr=self.factor())
+        elif self.current_token.type == INTEGER:
+            self.eat(INTEGER)
+            return Num(token)
+        elif self.current_token.type == LPAREN:
+            self.eat(LPAREN)
+            node = self.expr()
+            self.eat(RPAREN)
+            return node
+        elif self.current_token.type == ID:
+            node = self.variable()
+            return node
+        else:
+            self.error()
+
     def parse(self):
-        return self.expr()
+        node = self.program()
+        if self.current_token.type != EOF:
+            self.error()
+        return node
 
 
 class NodeVisitor(object):
@@ -178,6 +259,7 @@ def generic_visit(self, node):
 class Interpreter(NodeVisitor):
     def __init__(self, parser):
         self.parser = parser
+        self.GLOBAL_SCOPE = {}
 
     def visit_BinOp(self, node):
         if node.op.type == PLUS:
@@ -198,6 +280,25 @@ def visit_UnaryOp(self, node):
         elif node.op.type == MINUS:
             return -self.visit(node.expr)
 
+    def visit_Assign(self, node):
+        var_name = node.left.value
+        self.GLOBAL_SCOPE[var_name] = self.visit(node.right)
+
+    def visit_NoOp(self, node):
+        pass
+
+    def visit_Compound(self, node):
+        for child in node.children:
+            self.visit(child)
+
+    def visit_Var(self, node):
+        var_name = node.value
+        val = self.GLOBAL_SCOPE.get(var_name)
+        if val is None:
+            raise NameError(repr(var_name))
+        else:
+            return val
+
     def visit(self, node):
         if isinstance(node, BinOp):
             return self.visit_BinOp(node)
@@ -205,41 +306,30 @@ def visit(self, node):
             return self.visit_Num(node)
         elif isinstance(node, UnaryOp):
             return self.visit_UnaryOp(node)
+        elif isinstance(node, Var):
+            return self.visit_Var(node)
+        elif isinstance(node, Assign):
+            return self.visit_Assign(node)
+        elif isinstance(node, Compound):
+            return self.visit_Compound(node)
+        elif isinstance(node, NoOp):
+            return self.visit_NoOp(node)
 
     def interpret(self):
         tree = self.parser.parse()
         return self.visit(tree)
 
 
-def test_unary_op():
-    """
-    测试一元运算符, text=6---1
-    """
-    text = '5---2'
-    six_tok = Num(Token(INTEGER, 5))
-    one_tok =  Num(Token(INTEGER, 2))
-    minus_tok = Token(MINUS, '-')
-    exp_node = BinOp(six_tok, minus_tok, UnaryOp(minus_tok, UnaryOp(minus_tok, one_tok)))
-    interpreter = Interpreter(None)
-    print(interpreter.visit(exp_node))
-
-
 def main():
-    test_unary_op()
-    while True:
-        try:
-            text = input('input a express like "10+2*3+16/(4+4)-(3-2)*2"(Only single digit integers are allowed in the input)> ')
-        except EOFError:
-            break
-
-        if not text:
-            continue
-        analyzer = Analyzer(text)
-        parser = Parser(analyzer)
-        interpreter = Interpreter(parser)
-        print(interpreter.interpret())
+    import sys
+    text = open(sys.argv[1], 'r').read()
+    print(f"begin parse input: {text}")
+    lexer = Analyzer(text)
+    parser = Parser(lexer)
+    interpreter = Interpreter(parser)
+    result = interpreter.interpret()
+    print(interpreter.GLOBAL_SCOPE)
 
 
 if __name__ == '__main__':
     main()
-
diff --git a/sip_token.py b/sip_token.py
new file mode 100644
index 0000000..f29423f
--- /dev/null
+++ b/sip_token.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+@file: sip_token.py
+@author: amazing coder
+@date: 2024/8/29
+@desc: 
+"""
+class Token(object):
+    def __init__(self, type, value):
+        self.type = type
+        self.value = value
+
+    def __str__(self):
+        return 'Token({type}, {value})'.format(
+            type=self.type,
+            value=repr(self.value)
+        )
+
+    def __repr__(self):
+         return self.__str__()

From 3e1ab33b1d03e44070943c8cf6b809da358250da Mon Sep 17 00:00:00 2001
From: Amazing Coder <wcadaydayup@gmail.com>
Date: Thu, 29 Aug 2024 20:58:40 +0800
Subject: [PATCH 2/4] update README.md

---
 README.md | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 26d2225..e5f46e6 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,8 @@
 # simple_interpreter (A python interpreter implemented in python.)
-一个用 python 实现的简单python解释器
-
-分版本逐步实现完整功能，适合初学者学习解释器的工作原理
+一个用 python 实现的简单python解释器，分版本（与分支对应）逐步实现一个简单的python解释器功能，适合初学者了解解释器的工作原理
 
 ## 版本说明
+为了方便渐进式学习进度，每一个版本都创建了一个独立的分支，比如 v1.0版本对应的分支名为 v1.0, 该分支只实现了 v1.0 的功能，以此类推，逐步进行功能迭代。
 ### v1.0 
 only support single-digit integers +
 

From c08bafdebb6d9cce3942d0109a6907b0c0879177 Mon Sep 17 00:00:00 2001
From: Amazing Coder <wcadaydayup@gmail.com>
Date: Sat, 31 Aug 2024 18:05:43 +0800
Subject: [PATCH 3/4] v10.0 : handle variable not defined error

---
 README.md                    |  5 +-
 assignments.txt              |  4 +-
 func_test.py                 |  4 +-
 genptdot.py                  | 18 ++++----
 interpreter.py               | 89 +++++++++++++++++++++++++++++++++---
 spi_symbol.py                | 68 +++++++++++++++++++++++++++
 sip_token.py => spi_token.py |  2 +-
 7 files changed, 169 insertions(+), 21 deletions(-)
 create mode 100644 spi_symbol.py
 rename sip_token.py => spi_token.py (95%)

diff --git a/README.md b/README.md
index e5f46e6..6a80c49 100644
--- a/README.md
+++ b/README.md
@@ -55,4 +55,7 @@ python interpreter.py assignments.txt
 
 ```shell
 python genastdot.py assignments.txt > ast.dot && dot -Tpng -o ast_v9.png ast.dot  
-```
\ No newline at end of file
+```
+
+### v10.0
+增加符号表记录变量的定义，以处理使用未处理的变量
diff --git a/assignments.txt b/assignments.txt
index 46895eb..f5cba79 100644
--- a/assignments.txt
+++ b/assignments.txt
@@ -1,5 +1,5 @@
-a=1
+a=1.34
 b=2
 c=a+b
 d=a+b-c
-e=45+d
\ No newline at end of file
+e=45+f
\ No newline at end of file
diff --git a/func_test.py b/func_test.py
index 1c89ab0..6d0a32a 100644
--- a/func_test.py
+++ b/func_test.py
@@ -7,7 +7,7 @@
 @date: 2024/8/29
 @desc: 
 """
-from sip_token import Token
+from spi_token import Token
 from abs_syntax_tree import Num, BinOp, UnaryOp
 from interpreter import Analyzer, Parser, Interpreter, INTEGER, MINUS
 
@@ -31,7 +31,7 @@ def test_analyzer():
     print(text)
     analyzer = Analyzer(text)
     token = analyzer.get_next_token()
-    while token.type != 'EOF':
+    while token.symbol_type != 'EOF':
         print(token)
         token = analyzer.get_next_token()
 
diff --git a/genptdot.py b/genptdot.py
index 2198cd1..f4792c8 100644
--- a/genptdot.py
+++ b/genptdot.py
@@ -59,7 +59,7 @@ def eat(self, token_type):
         # type and if they match then "eat" the current token
         # and assign the next token to the self.current_token,
         # otherwise raise an exception.
-        if self.current_token.type == token_type:
+        if self.current_token.symbol_type == token_type:
             self.current_node.add(TokenNode(self.current_token.value))
             self.current_token = self.lexer.get_next_token()
         else:
@@ -73,9 +73,9 @@ def factor(self):
         self.current_node = node
 
         token = self.current_token
-        if token.type == INTEGER:
+        if token.symbol_type == INTEGER:
             self.eat(INTEGER)
-        elif token.type == LPAREN:
+        elif token.symbol_type == LPAREN:
             self.eat(LPAREN)
             self.expr()
             self.eat(RPAREN)
@@ -91,11 +91,11 @@ def term(self):
 
         self.factor()
 
-        while self.current_token.type in (MUL, DIV):
+        while self.current_token.symbol_type in (MUL, DIV):
             token = self.current_token
-            if token.type == MUL:
+            if token.symbol_type == MUL:
                 self.eat(MUL)
-            elif token.type == DIV:
+            elif token.symbol_type == DIV:
                 self.eat(DIV)
 
             self.factor()
@@ -119,11 +119,11 @@ def expr(self):
 
         self.term()
 
-        while self.current_token.type in (PLUS, MINUS):
+        while self.current_token.symbol_type in (PLUS, MINUS):
             token = self.current_token
-            if token.type == PLUS:
+            if token.symbol_type == PLUS:
                 self.eat(PLUS)
-            elif token.type == MINUS:
+            elif token.symbol_type == MINUS:
                 self.eat(MINUS)
 
             self.term()
diff --git a/interpreter.py b/interpreter.py
index 131eff9..c120f49 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -15,14 +15,16 @@
 v7.0 : using ASTs represent the operator-operand model of arithmetic expressions.
 v8.0 : support unary operators (+, -)
 v9.0 : support to handle python assignment statements.
+v10.0 : handle variable not defined error
 """
 
 import keyword
 from abs_syntax_tree import BinOp, Num, UnaryOp, Var, NoOp, Compound, Assign
-from sip_token import Token
+from spi_token import Token
+from spi_symbol import VarSymbol, SymbolTable
 
 
-INTEGER, PLUS, EOF, MINUS, MUL, DIV, LPAREN, RPAREN, ID, ASSIGN, REPL = 'INTEGER', 'PLUS', 'EOF', 'MINUS', 'MUL', 'DIV', 'LPAREN', 'RPAREN', 'ID', 'ASSIGN', 'REPL'
+INTEGER, FLOAT, PLUS, EOF, MINUS, MUL, DIV, LPAREN, RPAREN, ID, ASSIGN, REPL = 'INTEGER', 'FLOAT', 'PLUS', 'EOF', 'MINUS', 'MUL', 'DIV', 'LPAREN', 'RPAREN', 'ID', 'ASSIGN', 'REPL'
 PYTHON_RESERVED_KEYWORDS = {key: Token(key, key) for key in keyword.kwlist}
 
 class Analyzer(object):
@@ -55,13 +57,21 @@ def peek(self):
         else:
             return self.text[peek_pos]
 
-    def integer(self):
+    def number(self):
         """return a multi-digit integer"""
         result = ''
         while self.current_char is not None and self.current_char.isdigit():
             result += self.current_char
             self.advance()
-        return int(result)
+        if self.current_char == '.':
+            result += self.current_char
+            self.advance()
+            while self.current_char is not None and self.current_char.isdigit():
+                result += self.current_char
+                self.advance()
+            return float(result)
+        else:
+            return int(result)
 
     def identifier(self):
         """return a multi-digit identifier"""
@@ -81,7 +91,8 @@ def get_next_token(self):
                 self.skip_whitespace()
                 continue
             if self.current_char.isdigit():
-                return Token(INTEGER, self.integer())
+                number = self.number()
+                return Token(INTEGER, number) if isinstance(number, int) else Token(FLOAT, number)
             if self.current_char == '+':
                 self.advance()
                 return Token(PLUS, '+')
@@ -228,6 +239,9 @@ def factor(self):
         elif self.current_token.type == INTEGER:
             self.eat(INTEGER)
             return Num(token)
+        elif self.current_token.type == FLOAT:
+            self.eat(FLOAT)
+            return Num(token)
         elif self.current_token.type == LPAREN:
             self.eat(LPAREN)
             node = self.expr()
@@ -317,12 +331,75 @@ def visit(self, node):
 
     def interpret(self):
         tree = self.parser.parse()
+        symbol_builder = SymbolTableBuilder()
+        symbol_builder.visit(tree)
         return self.visit(tree)
 
 
+class SymbolTableBuilder(NodeVisitor):
+    def __init__(self):
+        self.symtab = SymbolTable()
+
+    def visit_BinOp(self, node):
+        self.visit(node.left)
+        self.visit(node.right)
+
+    def visit_Num(self, node):
+        pass
+
+    def visit_UnaryOp(self, node):
+        self.visit(node.expr)
+
+    def visit_Compound(self, node):
+        for child in node.children:
+            self.visit(child)
+
+    def visit_NoOp(self, node):
+        pass
+
+    def visit_VarDecl(self, node):
+        type_name = node.type_node.value
+        type_symbol = self.symtab.lookup(type_name)
+        var_name = node.var_node.value
+        var_symbol = VarSymbol(var_name, type_symbol)
+        self.symtab.define(var_symbol)
+
+    def visit_Assign(self, node):
+        # python代码中赋值就是定义，没有声明
+        var_name = node.left.value
+        var_symbol = VarSymbol(var_name, None)
+        self.symtab.define(var_symbol)
+        self.visit(node.right)
+
+    def visit_Var(self, node):
+        var_name = node.value
+        var_symbol = self.symtab.lookup(var_name)
+        if var_symbol is None:
+            raise NameError(repr(var_name))
+
+    def visit(self, node):
+        if isinstance(node, BinOp):
+            return self.visit_BinOp(node)
+        elif isinstance(node, Num):
+            return self.visit_Num(node)
+        elif isinstance(node, UnaryOp):
+            return self.visit_UnaryOp(node)
+        elif isinstance(node, Var):
+            return self.visit_Var(node)
+        elif isinstance(node, Assign):
+            return self.visit_Assign(node)
+        elif isinstance(node, Compound):
+            return self.visit_Compound(node)
+        elif isinstance(node, NoOp):
+            return self.visit_NoOp(node)
+
+
+
 def main():
     import sys
-    text = open(sys.argv[1], 'r').read()
+    py_file = sys.argv[1]
+    # py_file = 'assignments.txt'
+    text = open(py_file, 'r').read()
     print(f"begin parse input: {text}")
     lexer = Analyzer(text)
     parser = Parser(lexer)
diff --git a/spi_symbol.py b/spi_symbol.py
new file mode 100644
index 0000000..2780feb
--- /dev/null
+++ b/spi_symbol.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+@file: spi_symbol.py
+@author: amazing coder
+@date: 2024/8/31
+@desc: 增加通用符号类
+"""
+
+class Symbol(object):
+    def __int__(self, name, type=None):
+        self.name = name
+        self.symbol_type = type
+
+
+class BuiltinTypeSymbol(Symbol):
+    def __init__(self, name):
+        super().__int__(self, name)
+
+    def __str__(self):
+        return self.name
+
+    __repr__ = __str__
+
+
+class VarSymbol(Symbol):
+    def __init__(self, name, type=None):
+        # python 定义时可以不指定类型
+        super().__int__(name, type)
+
+    def __str__(self):
+        return f'VarSymbol:name={self.name}: type={str(self.symbol_type)}'
+
+    __repr__ = __str__
+
+
+class SymbolTable(object):
+    def __init__(self):
+        self._symbols = {}
+
+    def __str__(self):
+        return 'Symbols: {symbols}'.format(symbols=[value for value in self._symbols.values()])
+
+    __repr__ = __str__
+
+    def define(self, symbol):
+        print('Define: %s' % symbol)
+        self._symbols[symbol.name] = symbol
+        return symbol
+
+    def lookup(self, name):
+        print('Lookup: %s' % name)
+        symbol = self._symbols.get(name)
+        return symbol
+
+
+def test_class():
+    int_type = BuiltinTypeSymbol('INTEGER')
+    float_type = BuiltinTypeSymbol('FLOAT')
+    var_x = VarSymbol('x', int_type)
+    var_y = VarSymbol('y', float_type)
+    print(var_x)
+    print(var_y)
+
+
+if __name__ == '__main__':
+    test_class()
\ No newline at end of file
diff --git a/sip_token.py b/spi_token.py
similarity index 95%
rename from sip_token.py
rename to spi_token.py
index f29423f..55cb73e 100644
--- a/sip_token.py
+++ b/spi_token.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 """
-@file: sip_token.py
+@file: spi_token.py
 @author: amazing coder
 @date: 2024/8/29
 @desc: 

From 26c42e2863a892ae9b3ef496ffee2570e4234d69 Mon Sep 17 00:00:00 2001
From: Amazing Coder <wcadaydayup@gmail.com>
Date: Fri, 14 Mar 2025 15:16:43 +0800
Subject: [PATCH 4/4] format code with autopep8

---
 spi_symbol.py | 7 ++++---
 spi_token.py  | 4 +++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/spi_symbol.py b/spi_symbol.py
index 2780feb..791cd08 100644
--- a/spi_symbol.py
+++ b/spi_symbol.py
@@ -8,6 +8,7 @@
 @desc: 增加通用符号类
 """
 
+
 class Symbol(object):
     def __int__(self, name, type=None):
         self.name = name
@@ -16,7 +17,7 @@ def __int__(self, name, type=None):
 
 class BuiltinTypeSymbol(Symbol):
     def __init__(self, name):
-        super().__int__(self, name)
+        super().__int__(name)
 
     def __str__(self):
         return self.name
@@ -30,7 +31,7 @@ def __init__(self, name, type=None):
         super().__int__(name, type)
 
     def __str__(self):
-        return f'VarSymbol:name={self.name}: type={str(self.symbol_type)}'
+        return f'VarSymbol:name={self.name}: type={self.symbol_type}'
 
     __repr__ = __str__
 
@@ -65,4 +66,4 @@ def test_class():
 
 
 if __name__ == '__main__':
-    test_class()
\ No newline at end of file
+    test_class()
diff --git a/spi_token.py b/spi_token.py
index 55cb73e..87bada4 100644
--- a/spi_token.py
+++ b/spi_token.py
@@ -7,6 +7,8 @@
 @date: 2024/8/29
 @desc: 
 """
+
+
 class Token(object):
     def __init__(self, type, value):
         self.type = type
@@ -19,4 +21,4 @@ def __str__(self):
         )
 
     def __repr__(self):
-         return self.__str__()
+        return self.__str__()