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A Python Book
raise RuntimeError, 'Empty file'
result = self.prog_reco()
return result
def prog_reco(self):
commandList = []
while 1:
result = self.command_reco()
if not result:
break
commandList.append(result)
return ASTNode(ProgNodeType, commandList)
def command_reco(self):
if self.tokenType == EOFTokType:
return None
result = self.func_call_reco()
return ASTNode(CommandNodeType, result)
def func_call_reco(self):
if self.tokenType == WordTokType:
term = ASTNode(TermNodeType, self.token)
self.tokenType, self.token, self.lineNo = self.tokens.next()
if self.tokenType == LParTokType:
self.tokenType, self.token, self.lineNo = self.tokens.next()
result = self.func_call_list_reco()
if result:
if self.tokenType == RParTokType:
self.tokenType, self.token, self.lineNo = \
self.tokens.next()
return ASTNode(FuncCallNodeType, term, result)
else:
raise ParseError(self.lineNo, 'missing right paren')
else:
raise ParseError(self.lineNo, 'bad func call list')
else:
raise ParseError(self.lineNo, 'missing left paren')
else:
return None
def func_call_list_reco(self):
terms = []
while 1:
result = self.func_call_reco()
if not result:
break
terms.append(result)
if self.tokenType != CommaTokType:
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