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306
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1 from .astnodes import Constant, Variable, Function, BaseType
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150
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2
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288
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3
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150
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4 class Scope:
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306
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5 """ A scope contains all symbols in a scope. It also has a parent scope,
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6 when looking for a symbol, also the parent scopes are checked. """
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217
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7 def __init__(self, parent=None):
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8 self.symbols = {}
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9 self.parent = parent
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10
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11 def __iter__(self):
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272
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12 # Iterate in a deterministic manner:
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13 return iter(self.Constants + self.Variables + self.Functions)
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217
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14
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15 @property
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16 def Syms(self):
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17 syms = self.symbols.values()
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18 return sorted(syms, key=lambda v: v.name)
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19
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20 @property
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21 def Constants(self):
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306
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22 return [s for s in self.Syms if type(s) is Constant]
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217
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23
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24 @property
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25 def Variables(self):
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306
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26 return [s for s in self.Syms if isinstance(s, Variable)]
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217
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27
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28 @property
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29 def Functions(self):
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306
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30 return [s for s in self.Syms if type(s) is Function]
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217
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31
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32 def getSymbol(self, name):
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272
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33 if name in self.symbols:
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34 return self.symbols[name]
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35 # Look for symbol:
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306
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36 elif self.parent:
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272
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37 return self.parent.getSymbol(name)
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306
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38 else:
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39 raise KeyError(name)
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40
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41 def __getitem__(self, key):
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42 return self.getSymbol(key)
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217
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43
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44 def hasSymbol(self, name):
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272
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45 if name in self.symbols:
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46 return True
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306
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47 elif self.parent:
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272
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48 return self.parent.hasSymbol(name)
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306
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49 else:
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50 return False
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51
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52 def __contains__(self, name):
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53 return self.hasSymbol(name)
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217
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54
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55 def addSymbol(self, sym):
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306
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56 assert sym.name not in self.symbols
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272
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57 self.symbols[sym.name] = sym
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150
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58
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217
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59 def __repr__(self):
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60 return 'Scope with {} symbols'.format(len(self.symbols))
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61
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272
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62
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306
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63 def createTopScope(target):
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64 scope = Scope()
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288
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65 for tn in ['u64', 'u32', 'u16', 'u8']:
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306
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66 scope.addSymbol(BaseType(tn))
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67 # buildin types:
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68 intType = BaseType('int')
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69 intType.bytesize = target.byte_sizes['int']
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70 scope.addSymbol(intType)
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71 scope.addSymbol(BaseType('double'))
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72 scope.addSymbol(BaseType('void'))
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73 scope.addSymbol(BaseType('bool'))
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74 scope.addSymbol(BaseType('string'))
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75 scope.addSymbol(BaseType('byte'))
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76 return scope
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