|
148
|
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 getType(self, name):
|
|
|
9 t = self.getSymbol(name)
|
|
|
10 print(t)
|
|
|
11 assert isinstance(t, astnodes.Type)
|
|
|
12 return t
|
|
|
13 def getSymbol(self, name):
|
|
|
14 if name in self.symbols:
|
|
|
15 return self.symbols[name]
|
|
|
16 # Look for symbol:
|
|
|
17 if self.parent:
|
|
|
18 return self.parent.getSymbol(name)
|
|
|
19 raise CompilerException("Symbol {0} not found".format(name), name.loc)
|
|
|
20 def hasSymbol(self, name):
|
|
|
21 if name in self.symbols:
|
|
|
22 return True
|
|
|
23 if self.parent:
|
|
|
24 return self.parent.hasSymbol(name)
|
|
|
25 return False
|
|
|
26
|
|
|
27 def addSymbol(self, sym):
|
|
|
28 self.symbols[sym.name] = sym
|
|
|
29
|
|
|
30 def createBuiltins(scope):
|
|
|
31 scope.addSymbol(astnodes.BaseType('int'))
|
|
|
32
|
|
|
33 class Semantics:
|
|
|
34 """ This class constructs the AST from parser input """
|
|
|
35 def __init__(self, diag):
|
|
|
36 self.diag = diag
|
|
|
37 def handlePackage(self, name, loc):
|
|
|
38 self.mod = astnodes.Package(name)
|
|
|
39 self.mod.loc = loc
|
|
|
40 self.mod.scope = self.curScope = Scope()
|
|
|
41 createBuiltins(self.curScope)
|
|
|
42 def handleBinop(self, lhs, op, rhs):
|
|
|
43 pass
|
|
|
44 def actOnLocal(self, t, name, ival):
|
|
|
45 s = astnodes.Variable(name, t, False)
|
|
|
46 self.curScope.addSymbol(s)
|
|
|
47 def actOnType(self, tok):
|
|
|
48 # Try to lookup type, in case of failure return void
|
|
|
49 pass
|
|
|
50
|
