From ad57a52ac92e0745a0006897374357d449189293 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Benedikt=20B=C3=B6hm?= <bb@xnull.de>
Date: Wed, 20 May 2009 10:17:07 +0200
Subject: convert tags to a typesafe enum so we can print strings instead of
 ints

---
 src/front/token.py | 92 +++++++++++++++++++++++++++++-------------------------
 1 file changed, 50 insertions(+), 42 deletions(-)

diff --git a/src/front/token.py b/src/front/token.py
index def0236..4cf646a 100644
--- a/src/front/token.py
+++ b/src/front/token.py
@@ -2,46 +2,55 @@
 # date: 20 Mai 2009
 
 class Tag:
-    # lexer tokens
-    NUMBER           = 1
-    TRUE             = 2
-    FALSE            = 3
-    IDENT            = 4
-    WHILE            = 5
-    IF               = 6
-    ELSE             = 7
-    END              = 8
-    LBRAK            = 9
-    RBRAK            = 10
-    LPAREN           = 11
-    RPAREN           = 12
-    NEWLINE          = 13
-    COMMA            = 14
-    FUN              = 15
-    ASSIGNMENT       = 16
-    RETURN           = 17
-    OPERATOR         = 18
+    def __init__(self, name):
+        self.name = name
 
-    # parser tokens
-    BOOL             = 19
-    JOIN             = 20
-    EQUALITY         = 21
-    RELATION         = 22
-    EXPRESSION       = 23
-    TERM             = 24
-    UNARY            = 25
-    FACTOR           = 26
-    IDENT_LIST       = 27
-    EXPRESSION_LIST  = 28
-    PROGRAM          = 29
-    FUNCTION         = 30
-    STATEMENT        = 31
-    STATEMENTS       = 32
-    IF_STATEMENT     = 33
-    WHILE_STATEMENT  = 34
-    RETURN_STATEMENT = 35
-    ASSIGN_STATEMENT = 36
-    FUNCTION_CALL    = 37
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return "<Tag: %s>" % self
+
+# lexer tokens
+Tag.NUMBER      = Tag("NUMBER")
+Tag.TRUE        = Tag("TRUE")
+Tag.FALSE       = Tag("FALSE")
+Tag.IDENT       = Tag("IDENT")
+Tag.WHILE       = Tag("WHILE")
+Tag.IF          = Tag("IF")
+Tag.ELSE        = Tag("ELSE")
+Tag.END         = Tag("END")
+Tag.LBRAK       = Tag("LBRAK")
+Tag.RBRAK       = Tag("RBRAK")
+Tag.LPAREN      = Tag("LPAREN")
+Tag.RPAREN      = Tag("RPAREN")
+Tag.NEWLINE     = Tag("NEWLINE")
+Tag.COMMA       = Tag("COMMA")
+Tag.FUN         = Tag("FUN")
+Tag.ASSIGNMENT  = Tag("ASSIGNMENT")
+Tag.RETURN      = Tag("RETURN")
+Tag.OPERATOR    = Tag("OPERATOR")
+
+# parser tokens
+Tag.BOOL        = Tag("BOOL")
+Tag.JOIN        = Tag("JOIN")
+Tag.EQUALITY    = Tag("EQUALITY")
+Tag.RELATION    = Tag("RELATION")
+Tag.EXPRESSION  = Tag("EXPRESSION")
+Tag.TERM        = Tag("TERM")
+Tag.UNARY       = Tag("UNARY")
+Tag.FACTOR      = Tag("FACTOR")
+Tag.IDENT       = Tag("IDENT")
+Tag.EXPRESSION  = Tag("EXPRESSION")
+Tag.PROGRAM     = Tag("PROGRAM")
+Tag.FUNCTION    = Tag("FUNCTION")
+Tag.STATEMENT   = Tag("STATEMENT")
+Tag.STATEMENTS  = Tag("STATEMENTS")
+Tag.IF          = Tag("IF")
+Tag.WHILE       = Tag("WHILE")
+Tag.RETURN      = Tag("RETURN")
+Tag.ASSIGN      = Tag("ASSIGN")
+Tag.FUNCTION    = Tag("FUNCTION")
 
 class Token:
     tag = None
@@ -51,7 +60,7 @@ class Token:
         return
 
     def __repr__(self):
-        return "<Token: %d>" % self.tag
+        return "<Token: %s>" % self.tag
 
 class ValueToken(Token):
     value = None
@@ -62,5 +71,4 @@ class ValueToken(Token):
         return
 
     def __repr__(self):
-        return "<Token: %d Value: %s>" % (self.tag, self.value.__str__())
-
+        return "<Token: %s, Value: %s>" % (self.tag, self.value.__str__())
-- 
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