X-Git-Url: https://code.kerkeslager.com/?p=fur;a=blobdiff_plain;f=transformation.py;h=e8ee51c9bab31edc1a60c0d4dbb841d95baefa67;hp=28252577b52d5d06c3f68d94516b5f03f09bee9a;hb=aa339c441f43849a8cae256aa130278ca7618b7e;hpb=6e7ba75736ca8b463a263e7d58aa8f6bff62faaf diff --git a/transformation.py b/transformation.py index 2825257..e8ee51c 100644 --- a/transformation.py +++ b/transformation.py @@ -1,7 +1,6 @@ import collections -import normalization -import parsing +import conversion CIntegerLiteral = collections.namedtuple( 'CIntegerLiteral', @@ -18,13 +17,6 @@ CStringLiteral = collections.namedtuple( ], ) -CConstantExpression = collections.namedtuple( - 'CConstantExpression', - [ - 'value' - ], -) - CVariableExpression = collections.namedtuple( 'CVariableExpression', [ @@ -40,31 +32,32 @@ CSymbolExpression = collections.namedtuple( ], ) -CNegationExpression = collections.namedtuple( - 'CNegationExpression', +CStructureLiteralExpression = collections.namedtuple( + 'CStructureLiteralExpression', [ - 'value', + 'field_count', + 'symbol_list_variable', + 'value_list_variable', ], ) -CFunctionCallForFurInfixOperator = collections.namedtuple( - 'CFunctionCallForFurInfixOperator', - [ - 'name', - 'left', - 'right', - ], +CPushStatement = collections.namedtuple( + 'CPushStatement', + ( + 'expression', + ), ) CFunctionCallExpression = collections.namedtuple( 'CFunctionCallExpression', - [ - 'name', + ( + 'metadata', + 'function_expression', 'argument_count', - 'argument_items', - ], + ), ) +# TODO We are currently not changing variables, just preventing them from being accessed. CSymbolAssignmentStatement = collections.namedtuple( 'CSymbolAssignmentStatement', [ @@ -82,6 +75,15 @@ CArrayVariableInitializationStatement = collections.namedtuple( ], ) +CSymbolArrayVariableInitializationStatement = collections.namedtuple( + 'CSymbolArrayVariableInitializationStatement', + [ + 'variable', + 'symbol_list', + 'symbol_list_indices', + ], +) + CVariableInitializationStatement = collections.namedtuple( 'CVariableInitializationStatement', [ @@ -109,8 +111,8 @@ CIfElseStatement = collections.namedtuple( 'CIfElseStatement', [ 'condition_expression', - 'if_statements', - 'else_statements', + 'if_statement_list', + 'else_statement_list', ], ) @@ -121,10 +123,13 @@ CFunctionDeclaration = collections.namedtuple( ], ) +# TODO If a function definition doesn't end with an expression, we have issues currently because we try to return statement. +# TODO Closures currently wrap entire defining environment, even symbols that are not used, which makes garbage collection ineffective. CFunctionDefinition = collections.namedtuple( 'CFunctionDefinition', [ 'name', + 'argument_name_list', 'statement_list', ], ) @@ -134,6 +139,7 @@ CProgram = collections.namedtuple( [ 'builtin_set', 'function_definition_list', + 'operator_declarations', 'statements', 'standard_libraries', 'string_literal_list', @@ -141,174 +147,150 @@ CProgram = collections.namedtuple( ], ) -EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING = { - '==': 'equals', - '!=': 'notEquals', - '<=': 'lessThanOrEqual', - '>=': 'greaterThanOrEqual', - '<': 'lessThan', - '>': 'greaterThan', +BUILTINS = { + 'concatenate': [], + 'false': [], + 'pow': ['math.h'], + 'print': ['stdio.h'], + 'true': [], } -def transform_comparison_level_expression(accumulators, expression): - # Transform expressions like 1 < 2 < 3 into expressions like 1 < 2 && 2 < 3 - if isinstance(expression.left, parsing.FurInfixExpression) and expression.left.order == 'comparison_level': - left = transform_comparison_level_expression( - accumulators, - expression.left - ) +def transform_variable_expression(accumulators, expression): + assert isinstance(expression, conversion.CPSVariableExpression) + return CVariableExpression(variable=expression.variable) - middle = left.right +def transform_string_literal_expression(accumulators, expression): + value = expression.string - right = transform_expression( - accumulators, - expression.right, - ) - - # TODO Don't evaluate the middle expression twice - return CFunctionCallForFurInfixOperator( - name='and', - left=left, - right=CFunctionCallForFurInfixOperator( - name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator], - left=middle, - right=right, - ), - ) - - return CFunctionCallForFurInfixOperator( - name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator], - left=transform_expression(accumulators, expression.left), - right=transform_expression(accumulators, expression.right), - ) + try: + index = accumulators.string_literal_list.index(value) + except ValueError: + index = len(accumulators.string_literal_list) + accumulators.string_literal_list.append(value) -BUILTINS = { - 'false': [], - 'pow': ['math.h'], - 'print': ['stdio.h'], - 'true': [], -} + return CStringLiteral(index=index, value=value) -def transform_variable_expression(accumulators, expression): - return CVariableExpression(variable=expression.variable) +def transform_symbol_expression(accumulators, expression): + if expression.symbol in BUILTINS: + accumulators.builtin_set.add(expression.symbol) -def transform_infix_expression(accumulators, expression): - if expression.order == 'comparison_level': - return transform_comparison_level_expression(accumulators, expression) - - INFIX_OPERATOR_TO_FUNCTION_NAME = { - '+': 'add', - '-': 'subtract', - '*': 'multiply', - '//': 'integerDivide', - '%': 'modularDivide', - 'and': 'and', - 'or': 'or', - } - - return CFunctionCallForFurInfixOperator( - name=INFIX_OPERATOR_TO_FUNCTION_NAME[expression.operator], - left=transform_expression(accumulators, expression.left), - right=transform_expression(accumulators, expression.right), + try: + symbol_list_index = accumulators.symbol_list.index(expression.symbol) + except ValueError: + symbol_list_index = len(accumulators.symbol_list) + accumulators.symbol_list.append(expression.symbol) + + return CSymbolExpression( + symbol=expression.symbol, + symbol_list_index=symbol_list_index, ) -def transform_expression(accumulators, expression): - if isinstance(expression, parsing.FurParenthesizedExpression): - # Parentheses can be removed because everything in the C output is explicitly parenthesized - return transform_expression(accumulators, expression.internal) +def transform_integer_literal_expression(accumulators, expression): + return CIntegerLiteral(value=expression.integer) - if isinstance(expression, parsing.FurNegationExpression): - return transform_negation_expression(accumulators, expression) +CListConstructExpression = collections.namedtuple( + 'CListConstructExpression', + ( + 'allocate', + ), +) - if isinstance(expression, parsing.FurFunctionCallExpression): - return transform_function_call_expression(accumulators, expression) +CLambdaExpression = collections.namedtuple( + 'CLambdaExpression', + ( + 'name', + ), +) + +CListAppendStatement = collections.namedtuple( + 'CListAppendStatement', + ( + 'list_expression', + 'item_expression', + ), +) - if isinstance(expression, parsing.FurSymbolExpression): - if expression.value in ['true', 'false']: - return CConstantExpression(value=expression.value) +def transform_structure_literal_expression(accumulators, expression): + return CStructureLiteralExpression( + field_count=expression.field_count, + symbol_list_variable=expression.symbol_list_variable, + value_list_variable=expression.value_list_variable, + ) - if expression.value not in accumulators.symbol_list: - symbol_list.append(expression.value) +def transform_lambda_expression(accumulators, expression): + # TODO This function feels hacky + if len(accumulators.lambda_number_list) == 0: + accumulators.lambda_number_list.append(0) + else: + accumulators.lambda_number_list.append(accumulators.lambda_number_list[-1] + 1) - return CSymbolExpression( - symbol=expression.value, - symbol_list_index=accumulators.symbol_list.index(expression.value), - ) + name = '__lambda_{}'.format(accumulators.lambda_number_list[-1]) - if isinstance(expression, parsing.FurStringLiteralExpression): - value = expression.value + accumulators.function_definition_list.append(CFunctionDefinition( + name=name, + argument_name_list=expression.argument_name_list, + statement_list=tuple(transform_statement(accumulators, s) for s in expression.statement_list), + )) - try: - index = accumulators.string_literal_list.index(value) - except ValueError: - index = len(accumulators.string_literal_list) - accumulators.string_literal_list.append(value) + return CLambdaExpression(name=name) - return CStringLiteral(index=index, value=value) - LITERAL_TYPE_MAPPING = { - parsing.FurIntegerLiteralExpression: CIntegerLiteral, - } +def transform_list_construct_expression(accumulators, expression): + return CListConstructExpression(allocate=expression.allocate) - if type(expression) in LITERAL_TYPE_MAPPING: - return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value) +def transform_list_append_statement(accumulators, expression): + return CListAppendStatement( + list_expression=transform_expression(accumulators, expression.list_expression), + item_expression=transform_expression(accumulators, expression.item_expression), + ) - # TODO Handle all possible types in this form +def transform_expression(accumulators, expression): return { - parsing.FurInfixExpression: transform_infix_expression, # TODO Shouldn't need this - normalization.NormalFunctionCallExpression: transform_function_call_expression, - normalization.NormalInfixExpression: transform_infix_expression, - normalization.NormalNegationExpression: transform_negation_expression, - normalization.NormalVariableExpression: transform_variable_expression, + conversion.CPSFunctionCallExpression: transform_function_call_expression, + conversion.CPSIntegerLiteralExpression: transform_integer_literal_expression, + conversion.CPSLambdaExpression: transform_lambda_expression, + conversion.CPSListConstructExpression: transform_list_construct_expression, + conversion.CPSStructureLiteralExpression: transform_structure_literal_expression, + conversion.CPSStringLiteralExpression: transform_string_literal_expression, + conversion.CPSSymbolExpression: transform_symbol_expression, + conversion.CPSVariableExpression: transform_variable_expression, }[type(expression)](accumulators, expression) def transform_symbol_assignment_statement(accumulators, assignment_statement): # TODO Check that target is not a builtin - if assignment_statement.target not in accumulators.symbol_list: + try: + symbol_list_index = accumulators.symbol_list.index(assignment_statement.target) + except ValueError: + symbol_list_index = len(accumulators.symbol_list) accumulators.symbol_list.append(assignment_statement.target) return CSymbolAssignmentStatement( target=assignment_statement.target, - target_symbol_list_index=accumulators.symbol_list.index(assignment_statement.target), + target_symbol_list_index=symbol_list_index, expression=transform_expression( accumulators, assignment_statement.expression, ), ) -def transform_negation_expression(accumulators, expression): - return CNegationExpression( - value=transform_expression(accumulators, expression.internal_expression), - ) - def transform_function_call_expression(accumulators, function_call): - if function_call.function.value in BUILTINS.keys(): - # TODO Check that the builtin is actually callable - accumulators.builtin_set.add(function_call.function.value) - # TODO Use the symbol from SYMBOL LIST return CFunctionCallExpression( - name=function_call.function.value, + metadata=function_call.metadata, + function_expression=transform_expression(accumulators, function_call.function_expression), argument_count=function_call.argument_count, - argument_items=transform_expression(accumulators, function_call.argument_items), ) def transform_expression_statement(accumulators, statement): - expression = { - parsing.FurFunctionCallExpression: transform_function_call_expression, - parsing.FurIntegerLiteralExpression: transform_expression, - normalization.NormalFunctionCallExpression: transform_function_call_expression, - }[type(statement.expression)](accumulators, statement.expression) - return CExpressionStatement( - expression=expression, + expression=transform_expression(accumulators, statement.expression), ) def transform_if_else_statement(accumulators, statement): return CIfElseStatement( condition_expression=transform_expression(accumulators, statement.condition_expression), - if_statements=tuple(transform_statement(accumulators, s) for s in statement.if_statements), - else_statements=tuple(transform_statement(accumulators, s) for s in statement.else_statements), + if_statement_list=tuple(transform_statement(accumulators, s) for s in statement.if_statement_list), + else_statement_list=tuple(transform_statement(accumulators, s) for s in statement.else_statement_list), ) def transform_array_variable_initialization_statement(accumulators, statement): @@ -317,6 +299,24 @@ def transform_array_variable_initialization_statement(accumulators, statement): items=tuple(transform_expression(accumulators, i) for i in statement.items), ) +def transform_symbol_array_variable_initialization_statement(accumulators, statement): + symbol_list_indices = [] + + for symbol in statement.symbol_list: + try: + symbol_list_index = accumulators.symbol_list.index(symbol) + except ValueError: + symbol_list_index = len(accumulators.symbol_list) + accumulators.symbol_list.append(symbol) + + symbol_list_indices.append(symbol_list_index) + + return CSymbolArrayVariableInitializationStatement( + variable=statement.variable, + symbol_list=statement.symbol_list, + symbol_list_indices=tuple(symbol_list_indices), + ) + def transform_variable_initialization_statement(accumulators, statement): return CVariableInitializationStatement( variable=statement.variable, @@ -334,23 +334,30 @@ def transform_function_definition_statement(accumulators, statement): if any(fd.name == statement.name for fd in accumulators.function_definition_list): raise Exception('A function with name "{}" already exists'.format(statement.name)) + # TODO Add argument names to the symbol table accumulators.function_definition_list.append(CFunctionDefinition( name=statement.name, + argument_name_list=statement.argument_name_list, statement_list=tuple(transform_statement(accumulators, s) for s in statement.statement_list) )) return CFunctionDeclaration(name=statement.name) +def transform_push_statement(accumulators, statement): + return CPushStatement(expression=transform_expression(accumulators, statement.expression)) + def transform_statement(accumulators, statement): return { - parsing.FurAssignmentStatement: transform_symbol_assignment_statement, - parsing.FurExpressionStatement: transform_expression_statement, - normalization.NormalArrayVariableInitializationStatement: transform_array_variable_initialization_statement, - normalization.NormalExpressionStatement: transform_expression_statement, - normalization.NormalFunctionDefinitionStatement: transform_function_definition_statement, - normalization.NormalIfElseStatement: transform_if_else_statement, - normalization.NormalVariableInitializationStatement: transform_variable_initialization_statement, - normalization.NormalVariableReassignmentStatement: transform_variable_reassignment_statement, + conversion.CPSArrayVariableInitializationStatement: transform_array_variable_initialization_statement, + conversion.CPSAssignmentStatement: transform_symbol_assignment_statement, + conversion.CPSExpressionStatement: transform_expression_statement, + conversion.CPSFunctionDefinitionStatement: transform_function_definition_statement, + conversion.CPSIfElseStatement: transform_if_else_statement, + conversion.CPSListAppendStatement: transform_list_append_statement, + conversion.CPSPushStatement: transform_push_statement, + conversion.CPSSymbolArrayVariableInitializationStatement: transform_symbol_array_variable_initialization_statement, + conversion.CPSVariableInitializationStatement: transform_variable_initialization_statement, + conversion.CPSVariableReassignmentStatement: transform_variable_reassignment_statement, }[type(statement)](accumulators, statement) @@ -359,6 +366,8 @@ Accumulators = collections.namedtuple( [ 'builtin_set', 'function_definition_list', + 'lambda_number_list', + 'operator_set', 'symbol_list', 'string_literal_list', ], @@ -368,6 +377,8 @@ def transform(program): accumulators = Accumulators( builtin_set=set(), function_definition_list=[], + lambda_number_list=[], + operator_set=set(), symbol_list=[], string_literal_list=[], ) @@ -384,6 +395,7 @@ def transform(program): return CProgram( builtin_set=accumulators.builtin_set, function_definition_list=accumulators.function_definition_list, + operator_declarations=tuple(sorted(accumulators.operator_set)), statements=statement_list, standard_libraries=standard_library_set, string_literal_list=accumulators.string_literal_list,