import collections
-import parsing
+import desugaring
import util
+NormalBuiltinExpression = collections.namedtuple(
+ 'NormalBuiltinExpression',
+ (
+ 'symbol',
+ ),
+)
+
NormalVariableExpression = collections.namedtuple(
'NormalVariableExpression',
[
],
)
+NormalLambdaExpression = collections.namedtuple(
+ 'NormalLambdaExpression',
+ (
+ 'name',
+ 'argument_name_list',
+ 'statement_list',
+ ),
+)
+
NormalStringLiteralExpression = collections.namedtuple(
'NormalStringLiteralExpression',
[
NormalSymbolExpression = collections.namedtuple(
'NormalSymbolExpression',
- [
+ (
'symbol',
- ],
-)
-
-NormalNegationExpression = collections.namedtuple(
- 'NormalNegationExpression',
- [
- 'internal_expression',
- ],
-)
-
-NormalDotExpression = collections.namedtuple(
- 'NormalDotExpression',
- [
- 'instance',
- 'field',
- ],
+ ),
)
-NormalInfixExpression = collections.namedtuple(
- 'NormalInfixExpression',
- [
- 'order',
- 'operator',
- ],
+NormalSymbolLiteralExpression = collections.namedtuple(
+ 'NormalSymbolLiteralExpression',
+ (
+ 'symbol',
+ ),
)
NormalPushStatement = collections.namedtuple(
NormalFunctionCallExpression = collections.namedtuple(
'NormalFunctionCallExpression',
[
+ 'metadata',
'function_expression',
'argument_count',
],
)
-NormalArrayVariableInitializationStatement = collections.namedtuple(
- 'NormalArrayVariableInitializationStatement',
- [
- 'variable',
- 'items',
- ],
-)
-
-NormalSymbolArrayVariableInitializationStatement = collections.namedtuple(
- 'NormalSymbolArrayVariableInitializationStatement',
- [
- 'variable',
- 'symbol_list',
- ],
-)
-
NormalVariableInitializationStatement = collections.namedtuple(
'NormalVariableInitializationStatement',
[
],
)
-NormalVariableReassignmentStatement = collections.namedtuple(
- 'NormalVariableReassignmentStatement',
- [
- 'variable',
- 'expression',
- ],
-)
-
NormalExpressionStatement = collections.namedtuple(
'NormalExpressionStatement',
[
],
)
-NormalIfElseStatement = collections.namedtuple(
- 'NormalIfElseStatement',
+NormalIfElseExpression = collections.namedtuple(
+ 'NormalIfElseExpression',
[
'condition_expression',
'if_statement_list',
],
)
-NormalFunctionDefinitionStatement = collections.namedtuple(
- 'NormalFunctionDefinitionStatement',
- [
- 'name',
- 'argument_name_list',
- 'statement_list',
- ],
-)
-
NormalProgram = collections.namedtuple(
'NormalProgram',
[
],
)
-def fake_normalization(counter, thing):
- return (counter, (), thing)
+def normalize_builtin_expression(counter, expression):
+ return (
+ counter,
+ (),
+ NormalBuiltinExpression(symbol=expression.symbol),
+ )
def normalize_integer_literal_expression(counter, expression):
+ return (
+ counter,
+ (),
+ NormalIntegerLiteralExpression(integer=expression.integer),
+ )
+
+def normalize_lambda_expression(counter, expression):
variable = '${}'.format(counter)
+
+ _, statement_list = normalize_statement_list(
+ 0,
+ expression.statement_list,
+ )
+
return (
counter + 1,
(
NormalVariableInitializationStatement(
variable=variable,
- expression=NormalIntegerLiteralExpression(integer=expression.integer),
+ expression=NormalLambdaExpression(
+ name=expression.name,
+ argument_name_list=expression.argument_name_list,
+ statement_list=statement_list,
+ ),
),
),
NormalVariableExpression(variable=variable),
],
)
-NormalListAppendStatement = collections.namedtuple(
- 'NormalListAppendStatement',
- [
- 'list_expression',
- 'item_expression',
- ],
-)
-
-NormalListGetExpression = collections.namedtuple(
- 'NormalListGetExpression',
- [
- 'list_expression',
- 'index_expression',
- ],
-)
-
def normalize_list_literal_expression(counter, expression):
list_variable = '${}'.format(counter)
counter += 1
- prestatements = [
- NormalVariableInitializationStatement(
- variable=list_variable,
- expression=NormalListConstructExpression(allocate=len(expression.item_expression_list)),
- ),
- ]
-
- list_expression = NormalVariableExpression(variable=list_variable)
+ prestatements = []
for item_expression in expression.item_expression_list:
counter, item_expression_prestatements, normalized = normalize_expression(
prestatements.append(p)
prestatements.append(
- NormalListAppendStatement(
- list_expression=list_expression,
- item_expression=normalized,
+ NormalPushStatement(
+ expression=normalized,
)
)
return (
counter,
tuple(prestatements),
- list_expression,
- )
-
-def normalize_list_item_expression(counter, expression):
- counter, list_prestatements, list_expression = normalize_expression(counter, expression.list_expression)
- counter, index_prestatements, index_expression = normalize_expression(counter, expression.index_expression)
-
- result_variable = '${}'.format(counter)
- result_prestatement = NormalVariableInitializationStatement(
- variable=result_variable,
- expression=NormalListGetExpression(
- list_expression=list_expression,
- index_expression=index_expression,
- ),
- )
-
- return (
- counter + 1,
- list_prestatements + index_prestatements + (result_prestatement,),
- NormalVariableExpression(variable=result_variable),
+ NormalListConstructExpression(allocate=len(expression.item_expression_list)),
)
def normalize_string_literal_expression(counter, expression):
- variable = '${}'.format(counter)
return (
- counter + 1,
- (
- NormalVariableInitializationStatement(
- variable=variable,
- expression=NormalStringLiteralExpression(string=expression.string),
- ),
- ),
- NormalVariableExpression(variable=variable),
+ counter,
+ (),
+ NormalStringLiteralExpression(string=expression.string),
)
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(
+ for field in expression.fields:
+ counter, field_expression_prestatements, field_expression = normalize_expression(
counter,
- symbol_expression_pair.expression,
+ field.expression,
)
- for p in field_prestatements:
+ for p in field_expression_prestatements:
prestatements.append(p)
- field_symbol_array.append(symbol_expression_pair.symbol)
- field_value_array.append(field_expression)
+ prestatements.append(NormalPushStatement(
+ expression=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 = '${}'.format(counter)
-
- prestatements.append(
- NormalVariableInitializationStatement(
- variable=variable,
- expression=NormalStructureLiteralExpression(
- field_count=len(expression.fields),
- symbol_list_variable=symbol_array_variable,
- value_list_variable=value_array_variable,
+ prestatements.append(NormalPushStatement(
+ expression=NormalSymbolLiteralExpression(
+ symbol=field.symbol,
),
- )
- )
+ ))
return (
- counter + 1,
+ counter,
tuple(prestatements),
- NormalVariableExpression(variable=variable),
+ NormalStructureLiteralExpression(
+ field_count=len(expression.fields),
+ ),
)
-
def normalize_symbol_expression(counter, expression):
- variable = '${}'.format(counter)
return (
- counter + 1,
- (
- NormalVariableInitializationStatement(
- variable=variable,
- expression=NormalSymbolExpression(symbol=expression.symbol),
- ),
- ),
- NormalVariableExpression(variable=variable),
+ counter,
+ (),
+ NormalSymbolExpression(symbol=expression.symbol),
)
-def normalize_function_call_expression(counter, expression):
- assert isinstance(expression, parsing.FurFunctionCallExpression)
+def normalize_symbol_literal_expression(counter, expression):
+ return (
+ counter,
+ (),
+ NormalSymbolLiteralExpression(symbol=expression.symbol),
+ )
+def normalize_function_call_expression(counter, expression):
prestatements = []
- for argument in expression.arguments:
+ for argument in expression.argument_list:
counter, argument_prestatements, normalized_argument = normalize_expression(counter, argument)
for s in argument_prestatements:
prestatements.append(s)
- variable = '${}'.format(counter)
- prestatements.append(
- NormalVariableInitializationStatement(
- variable=variable,
- expression=normalized_argument,
- )
- )
prestatements.append(
NormalPushStatement(
- expression=NormalVariableExpression(
- variable=variable,
- ),
+ expression=normalized_argument,
),
)
- counter += 1
counter, function_prestatements, function_expression = normalize_expression(
counter,
for ps in function_prestatements:
prestatements.append(ps)
- if not isinstance(function_expression, NormalVariableExpression):
- function_variable = '${}'.format(counter)
-
- prestatements.append(
- NormalVariableInitializationStatement(
- variable=function_variable,
- expression=function_expression,
- )
- )
-
- function_expression = NormalVariableExpression(variable=function_variable)
- counter += 1
-
- result_variable = '${}'.format(counter)
-
- prestatements.append(
- NormalVariableInitializationStatement(
- variable=result_variable,
- expression=NormalFunctionCallExpression(
- function_expression=function_expression,
- argument_count=len(expression.arguments),
- ),
- )
- )
-
- return (
- counter + 1,
- tuple(prestatements),
- NormalVariableExpression(variable=result_variable),
- )
-
-def normalize_basic_infix_operation(counter, expression):
- counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
- counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
-
- center_variable = '${}'.format(counter)
- counter += 1
-
- root_prestatements = (
- NormalPushStatement(expression=left_expression),
- NormalPushStatement(expression=right_expression),
- NormalVariableInitializationStatement(
- variable=center_variable,
- expression=NormalInfixExpression(
- 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(
- order='and_level',
- operator='and',
- left=parsing.FurInfixExpression(
- order='comparison_level',
- operator=expression.left.operator,
- left=NormalVariableExpression(variable=left_variable),
- right=NormalVariableExpression(variable=middle_variable),
- ),
- right=parsing.FurInfixExpression(
- 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,
+ tuple(prestatements),
+ NormalFunctionCallExpression(
+ metadata=expression.metadata,
+ function_expression=function_expression,
+ argument_count=len(expression.argument_list),
),
)
- 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)
-
def normalize_if_expression(counter, expression):
counter, condition_prestatements, condition_expression = normalize_expression(
counter,
expression.condition_expression,
)
- result_variable = '${}'.format(counter)
- counter += 1
-
counter, if_statement_list = normalize_statement_list(
counter,
expression.if_statement_list,
- assign_result_to=result_variable,
)
counter, else_statement_list = normalize_statement_list(
counter,
expression.else_statement_list,
- assign_result_to=result_variable,
)
return (
counter,
- condition_prestatements + (
- NormalVariableInitializationStatement(
- variable=result_variable,
- expression=NormalVariableExpression(variable='builtin$nil'),
- ),
- NormalIfElseStatement(
- condition_expression=condition_expression,
- if_statement_list=if_statement_list,
- else_statement_list=else_statement_list,
- ),
- ),
- NormalVariableExpression(variable=result_variable),
- )
-
-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,
- ),
+ condition_prestatements,
+ NormalIfElseExpression(
+ condition_expression=condition_expression,
+ if_statement_list=if_statement_list,
+ else_statement_list=else_statement_list,
),
- 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.FurIfExpression: normalize_if_expression,
- parsing.FurInfixExpression: normalize_infix_expression,
- parsing.FurIntegerLiteralExpression: normalize_integer_literal_expression,
- parsing.FurListLiteralExpression: normalize_list_literal_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,
+ desugaring.DesugaredBuiltinExpression: normalize_builtin_expression,
+ desugaring.DesugaredFunctionCallExpression: normalize_function_call_expression,
+ desugaring.DesugaredIfExpression: normalize_if_expression,
+ desugaring.DesugaredIntegerLiteralExpression: normalize_integer_literal_expression,
+ desugaring.DesugaredLambdaExpression: normalize_lambda_expression,
+ desugaring.DesugaredListLiteralExpression: normalize_list_literal_expression,
+ desugaring.DesugaredStringLiteralExpression: normalize_string_literal_expression,
+ desugaring.DesugaredStructureLiteralExpression: normalize_structure_literal_expression,
+ desugaring.DesugaredSymbolExpression: normalize_symbol_expression,
+ desugaring.DesugaredSymbolLiteralExpression: normalize_symbol_literal_expression,
}[type(expression)](counter, expression)
def normalize_expression_statement(counter, statement):
NormalExpressionStatement(expression=normalized),
)
-def normalize_function_definition_statement(counter, statement):
- _, statement_list = normalize_statement_list(
- 0,
- statement.statement_list,
- assign_result_to='result',
- )
- return (
- counter,
- (),
- NormalFunctionDefinitionStatement(
- name=statement.name,
- argument_name_list=statement.argument_name_list,
- statement_list=statement_list,
- ),
- )
-
def normalize_assignment_statement(counter, statement):
counter, prestatements, normalized_expression = normalize_expression(counter, statement.expression)
return (
def normalize_statement(counter, statement):
return {
- parsing.FurAssignmentStatement: normalize_assignment_statement,
- parsing.FurExpressionStatement: normalize_expression_statement,
- parsing.FurFunctionDefinitionStatement: normalize_function_definition_statement,
+ desugaring.DesugaredAssignmentStatement: normalize_assignment_statement,
+ desugaring.DesugaredExpressionStatement: normalize_expression_statement,
}[type(statement)](counter, statement)
@util.force_generator(tuple)
-def normalize_statement_list(counter, statement_list, **kwargs):
- assign_result_to = kwargs.pop('assign_result_to', None)
-
- assert len(kwargs) == 0
-
+def normalize_statement_list(counter, statement_list):
result_statement_list = []
for statement in statement_list:
result_statement_list.append(s)
result_statement_list.append(normalized)
- # TODO The way we fix the last statement is really confusing
- last_statement = result_statement_list[-1]
-
- if isinstance(last_statement, NormalExpressionStatement) and isinstance(last_statement.expression, NormalVariableExpression):
- if assign_result_to is not None:
- result_expression = result_statement_list.pop().expression
- result_statement_list.append(
- NormalVariableReassignmentStatement(
- variable=assign_result_to,
- expression=result_expression,
- )
- )
-
return (
counter,
result_statement_list,
projects / fur / blobdiff