add scope, and symbol class, obsoletes SymbolTable

1 files changed, 34 insertions, 0 deletions

diff --git a/src/front/symbol.py b/src/front/symbol.py
new file mode 100644
index 0000000..879403f
--- /dev/null
+++ b/src/front/symbol.py
@@ -0,0 +1,34 @@
+class SymbolClass(object):
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return "<SymbolClass: %s>" % self
+
+SymbolClass.CONST = SymbolClass("CONST")
+SymbolClass.VAR   = SymbolClass("VAR")
+SymbolClass.FUNC  = SymbolClass("FUNC")
+
+class SymbolType(object):
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return "<SymbolType: %s>" % self
+
+SymbolType.INT  = SymbolType("INT")
+SymbolType.BOOL = SymbolType("BOOL")
+
+class Symbol(object):
+    __slots__ = ['cls', 'type', 'value']
+
+    def __init__(self, value, type = SymbolType.INT, cls = SymbolClass.VAR):
+        self.value = value
+        self.type = type
+        self.cls = cls