-def normalize_basic_infix_operation(counter, expression):
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
- counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
-
- left_variable = '${}'.format(counter)
- counter += 1
- right_variable = '${}'.format(counter)
- counter += 1
- center_variable = '${}'.format(counter)
- counter += 1
-
- root_prestatements = (
- NormalVariableInitializationStatement(
- variable=left_variable,
- expression=left_expression,
- ),
- NormalVariableInitializationStatement(
- variable=right_variable,
- expression=right_expression,
- ),
- NormalVariableInitializationStatement(
- variable=center_variable,
- expression=NormalInfixExpression(
- order=expression.order,
- operator=expression.operator,
- left=NormalVariableExpression(variable=left_variable),
- right=NormalVariableExpression(variable=right_variable),
- ),
- ),
- )
-
- return (
- counter,
- left_prestatements + right_prestatements + root_prestatements,
- NormalVariableExpression(variable=center_variable),
- )
-
-def normalize_comparison_expression(counter, expression):
- stack = []
-
- while isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
- stack.append((expression.operator, expression.order, expression.right))
- expression = expression.left
-
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
- counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
-
- left_variable = '${}'.format(counter)
- counter += 1
- right_variable = '${}'.format(counter)
- counter += 1
-
- root_prestatements = (
- NormalVariableInitializationStatement(
- variable=left_variable,
- expression=left_expression,
- ),
- NormalVariableInitializationStatement(
- variable=right_variable,
- expression=right_expression,
- ),
- )
-
- counter, result_prestatements, result_expression = (
- counter,
- left_prestatements + right_prestatements + root_prestatements,
- NormalInfixExpression(
- order=expression.order,
- operator=expression.operator,
- left=NormalVariableExpression(variable=left_variable),
- right=NormalVariableExpression(variable=right_variable),
- ),
- )
-
- while len(stack) > 0:
- right_operator, right_order, right_expression = stack.pop()
- and_right_expression = parsing.FurInfixExpression(
- operator=right_operator,
- order=right_order,
- left=NormalVariableExpression(variable=right_variable),
- right=right_expression,
- )
-
- and_expression = parsing.FurInfixExpression(
- operator='and',
- order='and_level',
- left=result_expression,
- right=and_right_expression,
- )
-
- counter, and_prestatements, result_expression = normalize_boolean_expression(
- counter,
- and_expression,
- )
-
- result_prestatements = result_prestatements + and_prestatements
-
- return (counter, result_prestatements, result_expression)
-
-def normalize_boolean_expression(counter, expression):
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
- counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
-
- result_variable = '${}'.format(counter)
- if_else_prestatment = NormalVariableInitializationStatement(
- variable=result_variable,
- expression=left_expression,
- )
- counter += 1
-
- condition_expression=NormalVariableExpression(variable=result_variable)
- short_circuited_statements = right_prestatements + (NormalVariableReassignmentStatement(variable=result_variable, expression=right_expression),)
-
- if expression.operator == 'and':
- if_else_statement = NormalIfElseStatement(
- condition_expression=condition_expression,
- if_statement_list=short_circuited_statements,
- else_statement_list=(),
- )
-
- elif expression.operator == 'or':
- if_else_statement = NormalIfElseStatement(
- condition_expression=condition_expression,
- if_statement_list=(),
- else_statement_list=short_circuited_statements,
- )
-
- else:
- raise Exception('Unable to handle operator "{}"'.format(expression.operator))
-
- return (
- counter,
- left_prestatements + (if_else_prestatment, if_else_statement),
- NormalVariableExpression(variable=result_variable),
- )
-
-def normalize_dot_expression(counter, expression):
- assert isinstance(expression.right, parsing.FurSymbolExpression)
-
- counter, prestatements, left_expression = normalize_expression(counter, expression.left)
-
- variable = '${}'.format(counter)
-
- dot_expression_prestatement = NormalVariableInitializationStatement(
- variable=variable,
- expression=NormalDotExpression(
- instance=left_expression,
- field=expression.right.symbol,
- ),
- )
-
- return (
- counter + 1,
- prestatements + (dot_expression_prestatement,),
- NormalVariableExpression(variable=variable),
- )
-
-def normalize_infix_expression(counter, expression):
- return {
- 'multiplication_level': normalize_basic_infix_operation,
- 'addition_level': normalize_basic_infix_operation,
- 'comparison_level': normalize_comparison_expression,
- 'dot_level': normalize_dot_expression,
- 'and_level': normalize_boolean_expression,
- 'or_level': normalize_boolean_expression,
- }[expression.order](counter, expression)
-