implemented lexer (with tokens and symbolTable)

todo: beautify code, implement token classes for parser
implemented test function with testcode
moved token class to single file (token.py)

1 files changed, 25 insertions, 4 deletions

diff --git a/src/front/symbols.py b/src/front/symbols.py
index f4ab40e..a868d77 100644
--- a/src/front/symbols.py
+++ b/src/front/symbols.py
@@ -1,9 +1,30 @@
 class SymbolTable:
     def __init__(self):
+        self.symbols = {}
         return
 
-    def put(token, id):
-        return
+    def put(self, token, id=None):
+        if id and not id.isdigit():
+            raise Exception("Only digits as id possible. '%s' is not a number" % id)
 
-    def get(token):
-        return
+        if id == None:
+            if len(self.symbols) <= 0:
+                id = 0
+            else:
+                id = max(self.symbols.values()) + 1
+            
+        self.symbols[token] = id
+        return id
+        
+
+    def get(self, token):
+        if token in self.symbols:
+            return self.symbols[token]
+
+        return None
+
+    def getOrPut(self, token):
+        if self.get(token):
+            return self.get(token)
+
+        return self.put(token)