Mercurial > lcfOS
annotate python/ks/symboltable.py @ 182:e9b27f7193e3
Replace clear function by function also supported in python 3.2
| author | Windel Bouwman |
|---|---|
| date | Sat, 18 May 2013 18:24:42 +0200 |
| parents | 91af0e40f868 |
| children |
| rev | line source |
|---|---|
| 1 | 1 from .nodes import * |
| 2 | |
| 3 class SymbolTable: | |
| 4 """ | |
| 5 Symbol table for a current scope. | |
| 6 It has functions: | |
| 7 - hasname for checking for a name in current scope or above | |
| 8 - addSymbol to add an object | |
| 9 """ | |
| 10 def __init__(self, parent=None): | |
| 11 self.parent = parent | |
| 12 self.syms = {} | |
| 13 | |
| 14 def __repr__(self): | |
| 15 return 'Symboltable with {0} symbols\n'.format(len(self.syms)) | |
| 16 | |
| 17 def printTable(self, indent=0): | |
| 18 for name in self.syms: | |
| 19 print(self.syms[name]) | |
| 20 | |
| 21 def getAllLocal(self, cls): | |
| 22 """ Get all local objects of a specific type """ | |
| 23 r = [] | |
| 24 for key in self.syms.keys(): | |
| 25 sym = self.syms[key] | |
| 26 if issubclass(type(sym), cls): | |
| 27 r.append(sym) | |
| 28 return r | |
| 29 | |
| 30 def getLocal(self, cls, name): | |
| 31 if name in self.syms.keys(): | |
| 32 sym = self.syms[name] | |
| 33 if isinstance(sym, cls): | |
| 34 return sym | |
| 35 else: | |
| 36 Error('Wrong type found') | |
| 37 else: | |
| 38 Error('Symbol not found') | |
| 39 | |
| 40 # Retrieving of specific classes of items: | |
| 41 def get(self, cls, name): | |
| 42 if self.hasSymbol(name): | |
| 43 sym = self.getSymbol(name) | |
| 44 if issubclass(type(sym), cls): | |
| 45 return sym | |
| 46 raise SymbolException('type {0} undefined'.format(typename)) | |
| 47 | |
| 48 def has(self, cls, name): | |
| 49 if self.hasSymbol(name): | |
| 50 sym = self.getSymbol(name) | |
| 51 if issubclass(type(sym), cls): | |
| 52 return True | |
| 53 return False | |
| 54 | |
| 55 # Adding and retrieving of symbols in general: | |
| 56 def addSymbol(self, sym): | |
| 57 if sym.name in self.syms.keys(): | |
| 58 raise Exception('Symbol "{0}" redefined'.format(sym.name)) | |
| 59 else: | |
| 60 self.syms[sym.name] = sym | |
| 61 | |
| 62 def getSymbol(self, name): | |
| 63 if name in self.syms.keys(): | |
| 64 return self.syms[name] | |
| 65 else: | |
| 66 if self.parent: | |
| 67 return self.parent.getSymbol(name) | |
| 68 else: | |
|
182
e9b27f7193e3
Replace clear function by function also supported in python 3.2
Windel Bouwman
parents:
146
diff
changeset
|
69 raise Exception('Symbol "{0}" undeclared!'.format(name)) |
| 1 | 70 |
| 71 def hasSymbol(self, name): | |
| 72 if name in self.syms.keys(): | |
| 73 return True | |
| 74 else: | |
| 75 if self.parent: | |
| 76 return self.parent.hasSymbol(name) | |
| 77 else: | |
| 78 return False | |
| 79 |