-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)
-
- center_variable = '${}'.format(counter)
- counter += 1
-
- root_prestatements = (
- NormalPushStatement(expression=left_expression),
- NormalPushStatement(expression=right_expression),
- NormalVariableInitializationStatement(
- variable=center_variable,
- expression=NormalInfixExpression(
- metadata=expression.metadata,
- order=expression.order,
- operator=expression.operator,
- ),
- ),
- )
-
- return (
- counter,
- left_prestatements + right_prestatements + root_prestatements,
- NormalVariableExpression(variable=center_variable),
- )
-
-def desugar_ternary_comparison(counter, expression):
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left.left)
- counter, middle_prestatements, middle_expression = normalize_expression(counter, expression.left.right)
-
- left_variable = '${}'.format(counter)
- counter += 1
- middle_variable = '${}'.format(counter)
- counter += 1
-
- # TODO Is there a memory leak if the middle expression throws an exception because the first expression result hasn't been added to the stack?
- juncture_prestatements = (
- NormalVariableInitializationStatement(
- variable=left_variable,
- expression=left_expression,
- ),
- NormalVariableInitializationStatement(
- variable=middle_variable,
- expression=middle_expression,
- )
- )
-
- counter, boolean_expression_prestatements, boolean_expression = normalize_boolean_expression(
- counter,
- parsing.FurInfixExpression(
- metadata=expression.left.metadata,
- order='and_level',
- operator='and',
- left=parsing.FurInfixExpression(
- metadata=expression.left.metadata,
- order='comparison_level',
- operator=expression.left.operator,
- left=NormalVariableExpression(variable=left_variable),
- right=NormalVariableExpression(variable=middle_variable),
- ),
- right=parsing.FurInfixExpression(
- metadata=expression.metadata,
- order='comparison_level',
- operator=expression.operator,
- left=NormalVariableExpression(variable=middle_variable),
- right=expression.right,
- ),
- )
- )
-
- return (
- counter,
- left_prestatements + middle_prestatements + juncture_prestatements + boolean_expression_prestatements,
- boolean_expression,
- )
-
-def normalize_comparison_expression(counter, expression):
- if isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
- return desugar_ternary_comparison(counter, expression)
-
- return normalize_basic_infix_operation(counter, expression)
-
-def normalize_boolean_expression(counter, expression):
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
- counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
-
- result_variable = '${}'.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)
-