added strings

oliverbeckon · Nov 27, 2024 · 82a7477 · 82a7477
1 parent 75a3809
commit 82a7477
Show file tree

Hide file tree

Showing 8 changed files with 27 additions and 8 deletions.
diff --git a/__pycache__/interpreter.cpython-312.pyc b/__pycache__/interpreter.cpython-312.pyc
diff --git a/__pycache__/lexer.cpython-312.pyc b/__pycache__/lexer.cpython-312.pyc
diff --git a/__pycache__/parser.cpython-312.pyc b/__pycache__/parser.cpython-312.pyc
diff --git a/interpreter.py b/interpreter.py
@@ -16,6 +16,8 @@ def interpret(self, ast):
                     self.interpret(node.body)
 
     def evaluate(self, node):
+        if isinstance(node, StringNode):
+            return node.value
         if isinstance(node, NumberNode):
             return node.value
         elif isinstance(node, BinOpNode):

diff --git a/lexer.py b/lexer.py
@@ -2,6 +2,7 @@
 
 TOKEN_TYPES = [
     ("NUMBER", r"\d+"),
+    ("STRING", r'"([^"\\]|\\.)*"|\'([^\'\\]|\\.)*\''),
     ("PLUS", r"\+"),
     ("MINUS", r"-"),
     ("TIMES", r"\*"),

diff --git a/main.py b/main.py
@@ -3,10 +3,9 @@
 import parser
 # Create a lexer with the source code
 source_code = """
-x : 1
+x : "test"
 for 5
-x : x + 1;
-say(x)
+say(x);
 """
 
 # Step 1: Tokenize the source code

diff --git a/notes.txt b/notes.txt
@@ -1,8 +1,9 @@
 Syntax:
     variable assignment statement is like this
         x : 3
-        y: 5
-        z:2
+        y : "String"
+
+
 
     Expressions
         2 + 3: 5
@@ -28,5 +29,9 @@ Syntax:
         #none of this will be interpreted
         this will
 
-
+    Structures
+        for x (for loop with no var)
+        for i +:: x (for loop with var)
+        ; (break / end loops)
+
 
diff --git a/parser.py b/parser.py
@@ -8,11 +8,14 @@ def __init__(self, loopvar, iterable, body):
         self.iterable = iterable
         self.body = body
 
-
 class NumberNode(ASTNode):
     def __init__(self, value):
         self.value = int(value)
 
+class StringNode(ASTNode):
+    def __init__(self, value):
+        self.value = str(value)
+
 class BinOpNode(ASTNode):
     def __init__(self, left, op, right):
         self.left = left
@@ -114,6 +117,12 @@ def parse_print(self):
     def parse_parentheses(self):
         left = None
         while self.current_token[0] != "RIGHTPAREN":
+            if self.current_token[0] == "STRING":
+                if left == None:
+                    left = StringNode(self.current_token[1])
+                    self.advance()
+                else:
+                    raise SystemError(f"Unexpected token in parentheses: {self.current_token[0]}")
             if self.current_token[0] == "IDENTIFIER":
                 if left == None:
                     left = VariableNode(self.current_token[1])
@@ -136,14 +145,17 @@ def parse_parentheses(self):
         print(f"parentheses expr: {left}")
         return left
 
-    def parse_expression(self) -> BinOpNode | VariableNode | NumberNode | None:
+    def parse_expression(self) -> BinOpNode | VariableNode | NumberNode | StringNode | None:
         left = None
         if self.current_token[0] == "IDENTIFIER":
             left = VariableNode(self.current_token[1])
             self.advance()
         elif self.current_token[0] == "NUMBER":
             left = NumberNode(self.current_token[1])
             self.advance()
+        elif self.current_token[0] == "STRING":
+            left = StringNode(self.current_token[1])
+            self.advance
         else:
             raise SyntaxError(f"Unexpected token in say function: {self.current_token[0]}")