def __bstmt(self):
"""<bstmt> ::= <vdecl> | <assign> | <cond> | <while> | <expr> SEMICOLON | <exit>"""
exprStarts = [
token.STRINGVAL, token.INTVAL, token.BOOLVAL, token.FLOATVAL,
token.NIL, token.LPAREN, token.NEW, token.ID
]
bstmt = None
if self.__tokenIs(token.VAR):
bstmt = self.__vdecl()
elif self.__tokenIs(token.SET):
bstmt = self.__assign()
elif self.__tokenIs(token.IF):
bstmt = self.__cond()
elif self.__tokenIs(token.WHILE):
bstmt = self.__while()
elif self.current_token.tokentype in exprStarts:
bstmt = ast.ExprStmt()
bstmt.expr = self.__expr()
self.__eat(token.SEMICOLON, "expected ';'")
else:
bstmt = self.__exit()
return bstmt
def __bstmt(self):
if self.current_token.tokentype == token.VAR:
return self.__vdecl()
elif self.current_token.tokentype == token.SET:
return self.__assign()
elif self.current_token.tokentype == token.IF:
return self.__cond()
elif self.current_token.tokentype == token.RETURN:
return self.__exit()
elif self.current_token.tokentype == token.WHILE:
return self.__while()
else:
expr_stmt = ast.ExprStmt()
expr_stmt.expr = self.__expr()
self.__eat(token.SEMICOLON, 'expecting semicolon')
return expr_stmt
def __bstmt(self, stmt_list_node):
if self.current_token.tokentype == token.VAR:
self.__vdecl(stmt_list_node.stmts)
elif self.current_token.tokentype == token.SET:
self.__assign(stmt_list_node)
elif self.current_token.tokentype == token.IF:
self.__cond(stmt_list_node)
elif self.current_token.tokentype == token.WHILE:
self.__while(stmt_list_node)
elif self.current_token.tokentype == token.RETURN:
self.__exit(stmt_list_node)
else:
exprStmtNode = ast.ExprStmt()
exprStmtNode.expr = self.__expr()
stmt_list_node.stmts.append(exprStmtNode)
self.__eat(token.SEMICOLON, 'expecting semicolon')
def __bstmt(self):
"""<bstmt> ::= <vdecl> | <assign> | <cond> | <while> | <expr> SEMICOLON | <exit>"""
if self.current_token.tokentype == token.VAR:
return self.__vdecl()
elif self.current_token.tokentype == token.SET:
return self.__assign()
elif self.current_token.tokentype == token.IF:
return self.__cond()
elif self.current_token.tokentype == token.WHILE:
return self.__while()
elif self.current_token.tokentype == token.RETURN:
return self.__exit()
else:
temp_expr_node = ast.ExprStmt()
temp_expr_node.expr = self.__expr()
self.__eat(token.SEMICOLON, 'expecting a ";"')
return temp_expr_node
def __bstmt(self):
# print("bstmt: " + str(self.current_token))
if self.current_token.tokentype == token.VAR:
return self.__vdecl() # return VarDeclStmt node
elif self.current_token.tokentype == token.SET:
return self.__assign() # return AssignStmt node
elif self.current_token.tokentype == token.IF:
return self.__cond() # return IfStmt node
elif self.current_token.tokentype == token.WHILE:
return self.__while() # return WhileStmt node
elif self.current_token.tokentype == token.RETURN:
return self.__exit() # return ReturnStmt node
else:
expr_stmt_node = ast.ExprStmt()
expr_stmt_node.expr = self.__expr()
self.__eat(token.SEMICOLON, 'expected ";"')
return expr_stmt_node # return ExprStmt node