Mercurial > lcfOS

comparison python/c3/scope.py @ 150:4ae0e02599de

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added type check start and analyze phase
author Windel Bouwman
date Fri, 01 Mar 2013 16:53:22 +0100
parents
children b28a11c01dbe
comparison
equal deleted inserted replaced
149:74241ca312cc 150:4ae0e02599de
1 from . import astnodes
2
3 class Scope:
4 """ A scope contains all symbols in a scope """
5 def __init__(self, parent=None):
6 self.symbols = {}
7 self.parent = parent
8 def __iter__(self):
9 return iter(self.symbols.values())
10 def getSymbol(self, name):
11 if name in self.symbols:
12 return self.symbols[name]
13 # Look for symbol:
14 if self.parent:
15 return self.parent.getSymbol(name)
16 raise CompilerException("Symbol {0} not found".format(name), name.loc)
17 def hasSymbol(self, name):
18 if name in self.symbols:
19 return True
20 if self.parent:
21 return self.parent.hasSymbol(name)
22 return False
23 def addSymbol(self, sym):
24 self.symbols[sym.name] = sym
25
26 def createBuiltins(scope):
27 for tn in ['int', 'u32', 'u16', 'double']:
28 scope.addSymbol(astnodes.BaseType(tn))
29
30 topScope = Scope()
31
32 createBuiltins(topScope)
33