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150
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1 from . import astnodes
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2
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3 class Scope:
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217
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4 """ A scope contains all symbols in a scope """
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5 def __init__(self, parent=None):
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6 self.symbols = {}
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7 self.parent = parent
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8
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9 def __iter__(self):
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272
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10 # Iterate in a deterministic manner:
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11 return iter(self.Constants + self.Variables + self.Functions)
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217
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12
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13 @property
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14 def Syms(self):
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15 syms = self.symbols.values()
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16 return sorted(syms, key=lambda v: v.name)
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17
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18 @property
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19 def Constants(self):
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20 return [s for s in self.Syms if type(s) is astnodes.Constant]
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21
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22 @property
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23 def Variables(self):
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272
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24 return [s for s in self.Syms if isinstance(s, astnodes.Variable)]
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217
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25
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26 @property
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27 def Functions(self):
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28 return [s for s in self.Syms if type(s) is astnodes.Function]
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29
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30 def getSymbol(self, name):
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272
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31 if name in self.symbols:
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32 return self.symbols[name]
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33 # Look for symbol:
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34 if self.parent:
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35 return self.parent.getSymbol(name)
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36 raise CompilerException("Symbol {0} not found".format(name), name.loc)
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217
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37
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38 def hasSymbol(self, name):
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272
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39 if name in self.symbols:
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40 return True
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41 if self.parent:
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42 return self.parent.hasSymbol(name)
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43 return False
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217
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44
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45 def addSymbol(self, sym):
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272
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46 self.symbols[sym.name] = sym
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150
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47
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217
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48 def __repr__(self):
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49 return 'Scope with {} symbols'.format(len(self.symbols))
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50
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272
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51
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163
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52 # buildin types:
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53 intType = astnodes.BaseType('int')
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231
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54 intType.bytesize = 4
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163
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55 doubleType = astnodes.BaseType('double')
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56 voidType = astnodes.BaseType('void')
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164
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57 boolType = astnodes.BaseType('bool')
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58 stringType = astnodes.BaseType('string')
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59 byteType = astnodes.BaseType('byte')
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163
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60
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150
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61 def createBuiltins(scope):
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163
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62 for tn in ['u64', 'u32', 'u16', 'u8']:
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150
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63 scope.addSymbol(astnodes.BaseType(tn))
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164
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64 for t in [intType, doubleType, voidType, boolType, stringType, byteType]:
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163
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65 scope.addSymbol(t)
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150
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66
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67 topScope = Scope()
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68 createBuiltins(topScope)
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69
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