import collections
+import parsing
+import util
+
+NormalVariableExpression = collections.namedtuple(
+ 'NormalVariableExpression',
+ [
+ 'variable',
+ ],
+)
+
+NormalIntegerLiteralExpression = collections.namedtuple(
+ 'NormalIntegerLiteralExpression',
+ [
+ 'integer',
+ ],
+)
+
+NormalStringLiteralExpression = collections.namedtuple(
+ 'NormalStringLiteralExpression',
+ [
+ 'string',
+ ],
+)
+
+NormalSymbolExpression = collections.namedtuple(
+ 'NormalSymbolExpression',
+ [
+ 'symbol',
+ ],
+)
+
+NormalNegationExpression = collections.namedtuple(
+ 'NormalNegationExpression',
+ [
+ 'internal_expression',
+ ],
+)
+
+NormalInfixExpression = collections.namedtuple(
+ 'NormalInfixExpression',
+ [
+ 'order',
+ 'operator',
+ 'left',
+ 'right',
+ ],
+)
+
+NormalFunctionCallExpression = collections.namedtuple(
+ 'NormalFunctionCallExpression',
+ [
+ 'function',
+ 'argument_count',
+ 'argument_items',
+ ],
+)
+
+NormalArrayVariableInitializationStatement = collections.namedtuple(
+ 'NormalArrayVariableInitializationStatement',
+ [
+ 'variable',
+ 'items',
+ ],
+)
+
+NormalVariableInitializationStatement = collections.namedtuple(
+ 'NormalVariableInitializationStatement',
+ [
+ 'variable',
+ 'expression',
+ ],
+)
+
+NormalVariableReassignmentStatement = collections.namedtuple(
+ 'NormalVariableReassignmentStatement',
+ [
+ 'variable',
+ 'expression',
+ ],
+)
+
+NormalExpressionStatement = collections.namedtuple(
+ 'NormalExpressionStatement',
+ [
+ 'expression',
+ ],
+)
+
+NormalAssignmentStatement = collections.namedtuple(
+ 'NormalAssignmentStatement',
+ [
+ 'target',
+ 'expression',
+ ],
+)
+
+NormalIfElseStatement = collections.namedtuple(
+ 'NormalIfElseStatement',
+ [
+ 'condition_expression',
+ 'if_statements',
+ 'else_statements',
+ ],
+)
+
+NormalFunctionDefinitionStatement = collections.namedtuple(
+ 'NormalFunctionDefinitionStatement',
+ [
+ 'name',
+ 'argument_name_list',
+ 'statement_list',
+ ],
+)
+
NormalProgram = collections.namedtuple(
'NormalProgram',
[
],
)
-def flatten(iterable):
- return tuple(item for internal in iterable for item in internal)
+def fake_normalization(counter, thing):
+ return (counter, (), thing)
+
+def normalize_integer_literal_expression(counter, expression):
+ # TODO Store this in a C variable
+ return (
+ counter,
+ (),
+ NormalIntegerLiteralExpression(integer=expression.integer),
+ )
+
+def normalize_string_literal_expression(counter, expression):
+ # TODO Store this in a C variable
+ return (
+ counter,
+ (),
+ NormalStringLiteralExpression(string=expression.string),
+ )
+
+def normalize_symbol_expression(counter, expression):
+ variable = '${}'.format(counter)
+ return (
+ counter + 1,
+ (NormalVariableInitializationStatement(
+ variable=variable,
+ expression=NormalSymbolExpression(symbol=expression.symbol),
+ ),),
+ NormalVariableExpression(variable=variable),
+ )
+
+def normalize_function_call_expression(counter, expression):
+ assert isinstance(expression, parsing.FurFunctionCallExpression)
+
+ prestatements = []
+ arguments = []
+
+ for argument in expression.arguments:
+ counter, argument_prestatements, normalized_argument = normalize_expression(counter, argument)
+
+ for s in argument_prestatements:
+ prestatements.append(s)
+
+ variable = '${}'.format(counter)
+ prestatements.append(NormalVariableInitializationStatement(
+ variable=variable,
+ expression=normalized_argument,
+ ))
+ arguments.append(NormalVariableExpression(
+ variable=variable,
+ ))
+ counter += 1
+
+ arguments_variable = '${}'.format(counter)
+ counter += 1
+
+ prestatements.append(NormalArrayVariableInitializationStatement(
+ variable=arguments_variable,
+ items=tuple(arguments),
+ ))
+
+ counter, function_prestatements, function_expression = normalize_expression(
+ counter,
+ expression.function,
+ )
+
+ for ps in function_prestatements:
+ prestatements.append(ps)
+
+ return (
+ counter,
+ tuple(prestatements),
+ NormalFunctionCallExpression(
+ function=function_expression,
+ argument_count=len(arguments),
+ argument_items=NormalVariableExpression(variable=arguments_variable),
+ ),
+ )
+
+def normalize_basic_infix_operation(counter, expression):
+ counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
+ counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
+
+ left_variable = '${}'.format(counter)
+ counter += 1
+ right_variable = '${}'.format(counter)
+ counter += 1
+
+ root_prestatements = (
+ NormalVariableInitializationStatement(
+ variable=left_variable,
+ expression=left_expression,
+ ),
+ NormalVariableInitializationStatement(
+ variable=right_variable,
+ expression=right_expression,
+ ),
+ )
+
+ return (
+ counter,
+ left_prestatements + right_prestatements + root_prestatements,
+ NormalInfixExpression(
+ order=expression.order,
+ operator=expression.operator,
+ left=NormalVariableExpression(variable=left_variable),
+ right=NormalVariableExpression(variable=right_variable),
+ ),
+ )
+
+def normalize_comparison_expression(counter, expression):
+ stack = []
+
+ while isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
+ stack.append((expression.operator, expression.order, expression.right))
+ expression = expression.left
+
+ counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
+ counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
+
+ left_variable = '${}'.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_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 {
+ 'multiplication_level': normalize_basic_infix_operation,
+ 'addition_level': normalize_basic_infix_operation,
+ 'comparison_level': normalize_comparison_expression,
+ 'and_level': normalize_boolean_expression,
+ '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_expression(counter, expression):
+ return {
+ NormalInfixExpression: fake_normalization,
+ NormalVariableExpression: fake_normalization,
+ parsing.FurFunctionCallExpression: normalize_function_call_expression,
+ parsing.FurInfixExpression: normalize_infix_expression,
+ parsing.FurIntegerLiteralExpression: normalize_integer_literal_expression,
+ parsing.FurNegationExpression: normalize_negation_expression,
+ parsing.FurStringLiteralExpression: normalize_string_literal_expression,
+ parsing.FurSymbolExpression: normalize_symbol_expression,
+ }[type(expression)](counter, expression)
+
+def normalize_expression_statement(counter, statement):
+ # TODO Normalized will be a NormalVariableExpression, which will go unused
+ # for expression statements in every case except when it's a return
+ # statement. This cases warnings on C compilation. We should only generate
+ # this variable when it will be used on return.
+ counter, prestatements, normalized = normalize_expression(counter, statement.expression)
+
+ return (
+ counter,
+ prestatements,
+ NormalExpressionStatement(expression=normalized),
+ )
+
+def normalize_function_definition_statement(counter, statement):
+ return (
+ counter,
+ (),
+ NormalFunctionDefinitionStatement(
+ name=statement.name,
+ argument_name_list=statement.argument_name_list,
+ statement_list=normalize_statement_list(statement.statement_list),
+ ),
+ )
+
+def normalize_assignment_statement(counter, statement):
+ counter, prestatements, normalized_expression = normalize_expression(counter, statement.expression)
+ return (
+ counter,
+ prestatements,
+ NormalAssignmentStatement(
+ target=statement.target,
+ expression=normalized_expression,
+ ),
+ )
+
+def normalize_statement(counter, statement):
+ return {
+ parsing.FurAssignmentStatement: normalize_assignment_statement,
+ parsing.FurExpressionStatement: normalize_expression_statement,
+ parsing.FurFunctionDefinitionStatement: normalize_function_definition_statement,
+ }[type(statement)](counter, statement)
+
+@util.force_generator(tuple)
+def normalize_statement_list(statement_list):
+ counter = 0
-def normalize_statement(statement):
- return (statement,)
+ for statement in statement_list:
+ counter, prestatements, normalized = normalize_statement(counter, statement)
+ for s in prestatements:
+ yield s
+ yield normalized
def normalize(program):
return NormalProgram(
- statement_list=flatten(normalize_statement(s) for s in program.statement_list),
+ statement_list=normalize_statement_list(program.statement_list),
)
projects / fur / blobdiff