],
)
+NormalDotExpression = collections.namedtuple(
+ 'NormalDotExpression',
+ [
+ 'instance',
+ 'field',
+ ],
+)
+
NormalInfixExpression = collections.namedtuple(
'NormalInfixExpression',
[
+ 'metadata',
'order',
'operator',
- 'left',
- 'right',
],
)
+NormalPushStatement = collections.namedtuple(
+ 'NormalPushStatement',
+ (
+ 'expression',
+ ),
+)
+
NormalFunctionCallExpression = collections.namedtuple(
'NormalFunctionCallExpression',
[
'function_expression',
'argument_count',
- 'argument_items',
],
)
],
)
+NormalSymbolArrayVariableInitializationStatement = collections.namedtuple(
+ 'NormalSymbolArrayVariableInitializationStatement',
+ [
+ 'variable',
+ 'symbol_list',
+ ],
+)
+
NormalVariableInitializationStatement = collections.namedtuple(
'NormalVariableInitializationStatement',
[
NormalVariableExpression(variable=variable),
)
+NormalStructureLiteralExpression = collections.namedtuple(
+ 'NormalStructureLiteralExpression',
+ [
+ 'field_count',
+ 'symbol_list_variable',
+ 'value_list_variable',
+ ],
+)
+
+def normalize_structure_literal_expression(counter, expression):
+ prestatements = []
+ field_symbol_array = []
+ field_value_array = []
+
+ for symbol_expression_pair in expression.fields:
+ counter, field_prestatements, field_expression = normalize_expression(
+ counter,
+ symbol_expression_pair.expression,
+ )
+
+ for p in field_prestatements:
+ prestatements.append(p)
+
+ field_symbol_array.append(symbol_expression_pair.symbol)
+ field_value_array.append(field_expression)
+
+ symbol_array_variable = '${}'.format(counter)
+ counter += 1
+
+ prestatements.append(
+ NormalSymbolArrayVariableInitializationStatement(
+ variable=symbol_array_variable,
+ symbol_list=tuple(field_symbol_array),
+ )
+ )
+
+ value_array_variable = '${}'.format(counter)
+ counter += 1
+
+ prestatements.append(
+ NormalArrayVariableInitializationStatement(
+ variable=value_array_variable,
+ items=tuple(field_value_array),
+ )
+ )
+
+ variable = '${}'.format(counter)
+
+ prestatements.append(
+ NormalVariableInitializationStatement(
+ variable=variable,
+ expression=NormalStructureLiteralExpression(
+ field_count=len(expression.fields),
+ symbol_list_variable=symbol_array_variable,
+ value_list_variable=value_array_variable,
+ ),
+ )
+ )
+
+ return (
+ counter + 1,
+ tuple(prestatements),
+ NormalVariableExpression(variable=variable),
+ )
+
+
def normalize_symbol_expression(counter, expression):
variable = '${}'.format(counter)
return (
assert isinstance(expression, parsing.FurFunctionCallExpression)
prestatements = []
- arguments = []
for argument in expression.arguments:
counter, argument_prestatements, normalized_argument = normalize_expression(counter, argument)
expression=normalized_argument,
)
)
- arguments.append(NormalVariableExpression(
- variable=variable,
- ))
+ prestatements.append(
+ NormalPushStatement(
+ expression=NormalVariableExpression(
+ variable=variable,
+ ),
+ ),
+ )
counter += 1
- arguments_variable = '${}'.format(counter)
- counter += 1
-
- prestatements.append(NormalArrayVariableInitializationStatement(
- variable=arguments_variable,
- items=tuple(arguments),
- ))
-
counter, function_prestatements, function_expression = normalize_expression(
counter,
expression.function,
variable=result_variable,
expression=NormalFunctionCallExpression(
function_expression=function_expression,
- argument_count=len(arguments),
- argument_items=NormalVariableExpression(variable=arguments_variable),
+ argument_count=len(expression.arguments),
),
)
)
counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
- left_variable = '${}'.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,
- ),
+ NormalPushStatement(expression=left_expression),
+ NormalPushStatement(expression=right_expression),
NormalVariableInitializationStatement(
variable=center_variable,
expression=NormalInfixExpression(
+ metadata=expression.metadata,
order=expression.order,
operator=expression.operator,
- left=NormalVariableExpression(variable=left_variable),
- right=NormalVariableExpression(variable=right_variable),
),
),
)
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)
+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 = '${}'.format(counter)
counter += 1
- right_variable = '${}'.format(counter)
+ middle_variable = '${}'.format(counter)
counter += 1
- root_prestatements = (
+ # 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=right_variable,
- expression=right_expression,
- ),
+ variable=middle_variable,
+ expression=middle_expression,
+ )
)
- counter, result_prestatements, result_expression = (
+ counter, boolean_expression_prestatements, boolean_expression = normalize_boolean_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',
+ parsing.FurInfixExpression(
+ metadata=expression.left.metadata,
order='and_level',
- left=result_expression,
- right=and_right_expression,
+ 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,
+ ),
)
+ )
- counter, and_prestatements, result_expression = normalize_boolean_expression(
- counter,
- and_expression,
- )
+ return (
+ counter,
+ left_prestatements + middle_prestatements + juncture_prestatements + boolean_expression_prestatements,
+ boolean_expression,
+ )
- result_prestatements = result_prestatements + and_prestatements
+def normalize_comparison_expression(counter, expression):
+ if isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
+ return desugar_ternary_comparison(counter, expression)
- return (counter, result_prestatements, result_expression)
+ return normalize_basic_infix_operation(counter, expression)
def normalize_boolean_expression(counter, expression):
counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
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)
parsing.FurListItemExpression: normalize_list_item_expression,
parsing.FurNegationExpression: normalize_negation_expression,
parsing.FurStringLiteralExpression: normalize_string_literal_expression,
+ parsing.FurStructureLiteralExpression: normalize_structure_literal_expression,
parsing.FurSymbolExpression: normalize_symbol_expression,
}[type(expression)](counter, expression)
projects / fur / blobdiff