X-Git-Url: https://code.kerkeslager.com/?a=blobdiff_plain;f=transformation.py;h=0eed799e1f7b46cbabc66fee1677b0c2d75493e2;hb=b059a00e0e2511a2ca2477db1e91d53fc5d2ec0f;hp=5de9bbf38c8e9c09a9f2f527ed6a1120894389fe;hpb=11018d3ac01dd8244ea924f2f03b735dfec4c822;p=fur diff --git a/transformation.py b/transformation.py index 5de9bbf..0eed799 100644 --- a/transformation.py +++ b/transformation.py @@ -60,7 +60,8 @@ CFunctionCallExpression = collections.namedtuple( 'CFunctionCallExpression', [ 'name', - 'arguments', + 'argument_count', + 'argument_items', ], ) @@ -73,8 +74,24 @@ CSymbolAssignmentStatement = collections.namedtuple( ], ) -CVariableAssignmentStatement = collections.namedtuple( - 'CVariableAssignmentStatement', +CArrayVariableInitializationStatement = collections.namedtuple( + 'CArrayVariableInitializationStatement', + [ + 'variable', + 'items', + ], +) + +CVariableInitializationStatement = collections.namedtuple( + 'CVariableInitializationStatement', + [ + 'variable', + 'expression', + ], +) + +CVariableReassignmentStatement = collections.namedtuple( + 'CVariableReassignmentStatement', [ 'variable', 'expression', @@ -88,10 +105,37 @@ CExpressionStatement = collections.namedtuple( ], ) +CIfElseStatement = collections.namedtuple( + 'CIfElseStatement', + [ + 'condition_expression', + 'if_statements', + 'else_statements', + ], +) + +CFunctionDeclaration = collections.namedtuple( + 'CFunctionDeclaration', + [ + 'name', + ], +) + +CFunctionDefinition = collections.namedtuple( + 'CFunctionDefinition', + [ + 'name', + 'argument_name_list', + 'statement_list', + ], +) + CProgram = collections.namedtuple( 'CProgram', [ 'builtin_set', + 'function_definition_list', + 'operator_declarations', 'statements', 'standard_libraries', 'string_literal_list', @@ -99,19 +143,74 @@ CProgram = collections.namedtuple( ], ) -EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING = { - '==': 'equals', - '!=': 'notEquals', - '<=': 'lessThanOrEqual', - '>=': 'greaterThanOrEqual', - '<': 'lessThan', - '>': 'greaterThan', +BUILTINS = { + 'false': [], + 'pow': ['math.h'], + 'print': ['stdio.h'], + 'true': [], +} + +def transform_variable_expression(accumulators, expression): + return CVariableExpression(variable=expression.variable) + +def transform_string_literal(accumulators, expression): + value = expression.value + + try: + index = accumulators.string_literal_list.index(value) + except ValueError: + index = len(accumulators.string_literal_list) + accumulators.string_literal_list.append(value) + + return CStringLiteral(index=index, value=value) + +def transform_symbol_expression(accumulators, expression): + if expression.value in ['true', 'false']: + return CConstantExpression(value=expression.value) + + try: + symbol_list_index = accumulators.symbol_list.index(expression.value) + except ValueError: + symbol_list_index = len(accumulators.symbol_list) + accumulators.symbol_list.append(expression.value) + + return CSymbolExpression( + symbol=expression.value, + symbol_list_index=symbol_list_index, + ) + +CInfixDeclaration = collections.namedtuple( + 'CInfixDeclaration', + [ + 'name', + 'in_type', + 'out_type', + 'operator', + ], +) + +INFIX_OPERATOR_TO_DECLARATION = { + '+': CInfixDeclaration(name='add', in_type='integer', out_type='integer', operator='+'), + '-': CInfixDeclaration(name='subtract', in_type='integer', out_type='integer', operator='-'), + '*': CInfixDeclaration(name='multiply', in_type='integer', out_type='integer', operator='*'), + '//': CInfixDeclaration(name='integerDivide', in_type='integer', out_type='integer', operator='/'), + '%': CInfixDeclaration(name='modularDivide', in_type='integer', out_type='integer', operator='%'), + 'and': CInfixDeclaration(name='and', in_type='boolean', out_type='boolean', operator='&&'), + 'or': CInfixDeclaration(name='or', in_type='boolean', out_type='boolean', operator='||'), + '==': CInfixDeclaration(name='equals', in_type='integer', out_type='boolean', operator='=='), + '!=': CInfixDeclaration(name='notEquals', in_type='integer', out_type='boolean', operator='!='), + '<=': CInfixDeclaration(name='lessThanOrEqual', in_type='integer', out_type='boolean', operator='<='), + '>=': CInfixDeclaration(name='greaterThanOrEqual', in_type='integer', out_type='boolean', operator='>='), + '<': CInfixDeclaration(name='lessThan', in_type='integer', out_type='boolean', operator='<'), + '>': CInfixDeclaration(name='greaterThan', in_type='integer', out_type='boolean', operator='>'), } -def transform_equality_level_expression(accumulators, expression): +def transform_comparison_level_expression(accumulators, expression): + accumulators.operator_set.add(INFIX_OPERATOR_TO_DECLARATION[expression.operator]) + # Transform expressions like 1 < 2 < 3 into expressions like 1 < 2 && 2 < 3 - if isinstance(expression.left, parsing.FurInfixExpression) and expression.left.order == 'equality_level': - left = transform_equality_level_expression( + if isinstance(expression.left, parsing.FurInfixExpression) and expression.left.order == 'comparison_level': + left = transform_comparison_level_expression( accumulators, expression.left ) @@ -128,154 +227,136 @@ def transform_equality_level_expression(accumulators, expression): name='and', left=left, right=CFunctionCallForFurInfixOperator( - name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator], + name=INFIX_OPERATOR_TO_DECLARATION[expression.operator].name, left=middle, right=right, ), ) return CFunctionCallForFurInfixOperator( - name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator], + name=INFIX_OPERATOR_TO_DECLARATION[expression.operator].name, left=transform_expression(accumulators, expression.left), right=transform_expression(accumulators, expression.right), ) -BUILTINS = { - 'false': [], - 'pow': ['math.h'], - 'print': ['stdio.h'], - 'true': [], -} - -def transform_variable_expression(accumulators, expression): - return CVariableExpression(variable=expression.variable) - def transform_infix_expression(accumulators, expression): - if expression.order == 'equality_level': - return transform_equality_level_expression(accumulators, expression) - - INFIX_OPERATOR_TO_FUNCTION_NAME = { - '+': 'add', - '-': 'subtract', - '*': 'multiply', - '//': 'integerDivide', - '%': 'modularDivide', - 'and': 'and', - 'or': 'or', - } + if expression.order == 'comparison_level': + return transform_comparison_level_expression(accumulators, expression) + + accumulators.operator_set.add(INFIX_OPERATOR_TO_DECLARATION[expression.operator]) return CFunctionCallForFurInfixOperator( - name=INFIX_OPERATOR_TO_FUNCTION_NAME[expression.operator], + name=INFIX_OPERATOR_TO_DECLARATION[expression.operator].name, left=transform_expression(accumulators, expression.left), right=transform_expression(accumulators, expression.right), ) -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) - - if isinstance(expression, parsing.FurNegationExpression): - return transform_negation_expression(accumulators, expression) +def transform_integer_literal_expression(accumulators, expression): + return CIntegerLiteral(value=expression.value) - if isinstance(expression, parsing.FurFunctionCallExpression): - return transform_function_call_expression(accumulators, expression) - - if isinstance(expression, parsing.FurSymbolExpression): - if expression.value in ['true', 'false']: - return CConstantExpression(value=expression.value) - - if expression.value not in accumulators.symbol_list: - symbol_list.append(expression.value) - - return CSymbolExpression( - symbol=expression.value, - symbol_list_index=accumulators.symbol_list.index(expression.value), - ) - - if isinstance(expression, parsing.FurStringLiteralExpression): - value = expression.value - - try: - index = accumulators.string_literal_list.index(value) - except ValueError: - index = len(accumulators.string_literal_list) - accumulators.string_literal_list.append(value) - - return CStringLiteral(index=index, value=value) - - LITERAL_TYPE_MAPPING = { - parsing.FurIntegerLiteralExpression: CIntegerLiteral, - } - - if type(expression) in LITERAL_TYPE_MAPPING: - return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value) +def transform_negation_expression(accumulators, expression): + return CNegationExpression( + value=transform_expression(accumulators, expression.internal_expression), + ) - # TODO Handle all possible types in this form +def transform_expression(accumulators, expression): + # TODO Clean up handlers for parsing expressions return { - parsing.FurInfixExpression: transform_infix_expression, # TODO Shouldn't need this + parsing.FurFunctionCallExpression: transform_function_call_expression, + parsing.FurInfixExpression: transform_infix_expression, + parsing.FurIntegerLiteralExpression: transform_integer_literal_expression, + parsing.FurNegationExpression: transform_negation_expression, + parsing.FurStringLiteralExpression: transform_string_literal, + parsing.FurSymbolExpression: transform_symbol_expression, normalization.NormalFunctionCallExpression: transform_function_call_expression, normalization.NormalInfixExpression: transform_infix_expression, + normalization.NormalNegationExpression: transform_negation_expression, normalization.NormalVariableExpression: 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, negation_expression): - return CNegationExpression( - value=transform_expression(accumulators, negation_expression.value), - ) - def transform_function_call_expression(accumulators, function_call): - # TODO Function should be a full expression if function_call.function.value in BUILTINS.keys(): # TODO Check that the builtin is actually callable accumulators.builtin_set.add(function_call.function.value) - return CFunctionCallExpression( - name='builtin$' + function_call.function.value, - arguments=tuple( - transform_expression(accumulators, arg) - for arg in function_call.arguments - ), - ) - - raise Exception() + # TODO Use the symbol from SYMBOL LIST + return CFunctionCallExpression( + name=function_call.function.value, + 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, - normalization.NormalFunctionCallExpression: transform_function_call_expression, - }[type(statement.expression)](accumulators, statement.expression) - return CExpressionStatement( - expression=expression, + expression=transform_expression(accumulators, statement.expression), ) -def transform_variable_assignment_statement(accumulators, statement): - return CVariableAssignmentStatement( +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), + ) + +def transform_array_variable_initialization_statement(accumulators, statement): + return CArrayVariableInitializationStatement( + variable=statement.variable, + items=tuple(transform_expression(accumulators, i) for i in statement.items), + ) + +def transform_variable_initialization_statement(accumulators, statement): + return CVariableInitializationStatement( + variable=statement.variable, + expression=transform_expression(accumulators, statement.expression), + ) + +def transform_variable_reassignment_statement(accumulators, statement): + return CVariableReassignmentStatement( variable=statement.variable, expression=transform_expression(accumulators, statement.expression), ) +def transform_function_definition_statement(accumulators, statement): + # TODO Allow defining the same function in different contexts + 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_statement(accumulators, statement): return { - parsing.FurAssignmentStatement: transform_symbol_assignment_statement, parsing.FurExpressionStatement: transform_expression_statement, - normalization.NormalVariableAssignmentStatement: transform_variable_assignment_statement, + normalization.NormalArrayVariableInitializationStatement: transform_array_variable_initialization_statement, + normalization.NormalAssignmentStatement: transform_symbol_assignment_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, }[type(statement)](accumulators, statement) @@ -283,6 +364,8 @@ Accumulators = collections.namedtuple( 'Accumulators', [ 'builtin_set', + 'function_definition_list', + 'operator_set', 'symbol_list', 'string_literal_list', ], @@ -291,6 +374,8 @@ Accumulators = collections.namedtuple( def transform(program): accumulators = Accumulators( builtin_set=set(), + function_definition_list=[], + operator_set=set(), symbol_list=[], string_literal_list=[], ) @@ -306,6 +391,8 @@ 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,