],
)
+NormalNegationExpression = collections.namedtuple(
+ 'NormalNegationExpression',
+ [
+ 'internal_expression',
+ ],
+)
+
NormalInfixExpression = collections.namedtuple(
'NormalInfixExpression',
[
],
)
-NormalVariableAssignmentStatement = collections.namedtuple(
- 'NormalVariableAssignmentStatement',
+NormalVariableInitializationStatement = collections.namedtuple(
+ 'NormalVariableInitializationStatement',
+ [
+ 'variable',
+ 'expression',
+ ],
+)
+
+NormalVariableReassignmentStatement = collections.namedtuple(
+ 'NormalVariableReassignmentStatement',
[
'variable',
'expression',
],
)
+NormalIfElseStatement = collections.namedtuple(
+ 'NormalIfElseStatement',
+ [
+ 'condition_expression',
+ 'if_statements',
+ 'else_statements',
+ ],
+)
+
NormalProgram = collections.namedtuple(
'NormalProgram',
[
prestatements.append(s)
variable = '${}'.format(counter)
- prestatements.append(NormalVariableAssignmentStatement(
+ prestatements.append(NormalVariableInitializationStatement(
variable=variable,
expression=normalized_argument,
))
counter += 1
root_prestatements = (
- NormalVariableAssignmentStatement(
+ NormalVariableInitializationStatement(
variable=left_variable,
expression=left_expression,
),
- NormalVariableAssignmentStatement(
+ NormalVariableInitializationStatement(
variable=right_variable,
expression=right_expression,
),
)
def normalize_comparison_expression(counter, expression):
- # TODO Unfake this
- return fake_normalization(counter, expression)
+ stack = []
+
+ while isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
+ stack.append((expression.operator, expression.order, expression.right))
+ expression = expression.left
+
+ counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
+ counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
+
+ left_variable = '${}'.format(counter)
+ counter += 1
+ right_variable = '${}'.format(counter)
+ counter += 1
+
+ root_prestatements = (
+ NormalVariableInitializationStatement(
+ variable=left_variable,
+ expression=left_expression,
+ ),
+ NormalVariableInitializationStatement(
+ variable=right_variable,
+ expression=right_expression,
+ ),
+ )
+
+ counter, result_prestatements, result_expression = (
+ counter,
+ left_prestatements + right_prestatements + root_prestatements,
+ # TODO Implement short-circuiting
+ NormalInfixExpression(
+ order=expression.order, # TODO Do we need this?
+ operator=expression.operator,
+ left=NormalVariableExpression(variable=left_variable),
+ right=NormalVariableExpression(variable=right_variable),
+ ),
+ )
+
+ while len(stack) > 0:
+ right_operator, right_order, right_expression = stack.pop()
+ and_right_expression = parsing.FurInfixExpression(
+ operator=right_operator,
+ order=right_order,
+ left=NormalVariableExpression(variable=right_variable),
+ right=right_expression,
+ )
+
+ and_expression = parsing.FurInfixExpression(
+ operator='and',
+ order='and_level',
+ left=result_expression,
+ right=and_right_expression,
+ )
+
+ counter, and_prestatements, result_expression = normalize_boolean_expression(
+ counter,
+ and_expression,
+ )
+
+ result_prestatements = result_prestatements + and_prestatements
+
+ return (counter, result_prestatements, result_expression)
def normalize_boolean_expression(counter, expression):
- # TODO Unfake this
- return fake_normalization(counter, expression)
+ counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
+ counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
+
+ result_variable = '${}'.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_statements=short_circuited_statements,
+ else_statements=(),
+ )
+
+ elif expression.operator == 'or':
+ if_else_statement = NormalIfElseStatement(
+ condition_expression=condition_expression,
+ if_statements=(),
+ else_statements=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_infix_expression(counter, expression):
return {
'or_level': normalize_boolean_expression,
}[expression.order](counter, expression)
+def normalize_negation_expression(counter, expression):
+ counter, prestatements, internal_expression = normalize_expression(counter, expression.value)
+
+ internal_variable = '${}'.format(counter)
+ counter += 1
+
+ return (
+ counter,
+ prestatements + (NormalVariableInitializationStatement(variable=internal_variable, expression=internal_expression),),
+ NormalNegationExpression(internal_expression=NormalVariableExpression(variable=internal_variable)),
+ )
+
+def normalize_parenthesized_expression(counter, expression):
+ return normalize_expression(counter, expression.internal)
+
def normalize_expression(counter, expression):
return {
+ NormalInfixExpression: fake_normalization,
+ NormalVariableExpression: fake_normalization,
parsing.FurFunctionCallExpression: normalize_function_call_expression,
parsing.FurInfixExpression: normalize_infix_expression,
parsing.FurIntegerLiteralExpression: fake_normalization,
- parsing.FurNegationExpression: fake_normalization, # TODO Don't fake this
- parsing.FurParenthesizedExpression: fake_normalization, # TODO Don't fake this
+ parsing.FurNegationExpression: normalize_negation_expression,
+ parsing.FurParenthesizedExpression: normalize_parenthesized_expression,
parsing.FurStringLiteralExpression: fake_normalization,
parsing.FurSymbolExpression: fake_normalization,
}[type(expression)](counter, expression)