def build_primary_expression(self, tree: grammerParser.RContext):
if tree.getChildCount() == 3:
return self.build_assignment_expression(tree.getChild(1))
elif tree.getChild(0).getChildCount() != 0:
identifier, expression_list = self.build_variable_expression(
tree.getChild(0))
if self.symbol_table.is_function_existed(identifier) and len(
expression_list) == 0:
return identifier
if self.symbol_table.is_variable_existed(identifier):
symbol = self.symbol_table.get_variable(identifier)
if len(expression_list) > 0:
variable_expression = VariableExpression(
symbol, expression_list)
else:
variable_expression = VariableExpression(symbol)
return variable_expression
else:
raise CompilerError('variable is not defined')
elif tree.getChild(0).getPayload().type == grammerLexer.INT_CONSTANT:
return ConstantExpression(tree.getText(), 'int')
elif tree.getChild(0).getPayload().type == grammerLexer.BOOL_CONSTANT:
return ConstantExpression(tree.getText(), 'bool')
elif tree.getChild(0).getPayload().type == grammerLexer.REAL_CONSTANT:
return ConstantExpression(tree.getText(), 'real')
def build_variable_expression(self, tree: grammerParser.RContext):
if tree.getChildCount() == 1:
return tree.getText(), []
else:
identifier, expression_list = self.build_variable_expression(
tree.getChild(0))
expression_list.append(
self.build_assignment_expression(tree.getChild(2)))
return identifier, expression_list
def build_declarator(self, tree: grammerParser.RContext):
if tree.getChildCount() == 1:
identifier = tree.getText()
return identifier, []
elif tree.getChildCount() == 4 and tree.getChild(
0).getRuleIndex() == grammerParser.RULE_declarator:
identifier, size_list = self.build_declarator(tree.getChild(0))
expression = self.build_logical_or_expression(tree.getChild(2))
if isinstance(
expression,
ConstantExpression) and expression.get_type() == 'int':
size_list.append(expression.get_value())
return identifier, size_list
def build_parameter_declarator(self, tree: grammerParser.RContext):
if tree.getChildCount() != 1:
pass # TODO 函数参数出错
else:
return tree.getText()
def build_function_name(self, tree: grammerParser.RContext):
if tree.getPayload().type == grammerLexer.IDENTIFIER:
return tree.getText()
else:
raise
def build_declaration_specifiers(self, tree: grammerParser.RContext):
return tree.getText()
def build_unary_operator(self, tree: grammerParser.RContext):
return tree.getText()
def build_assignment_operator(self, tree: grammerParser.RContext):
return tree.getText()