X-Git-Url: https://code.kerkeslager.com/?a=blobdiff_plain;f=transformation.py;h=5fb853c40a86d62ea2f6be4b7e0d8583e5ee53c8;hb=e5e0dba41edce39475f839e29650007b37641be9;hp=b75b3a0fa522df7d504c814896e05be635bc03ef;hpb=f4f13322a77eaf87328a4279c766228bb7391978;p=fur diff --git a/transformation.py b/transformation.py index b75b3a0..5fb853c 100644 --- a/transformation.py +++ b/transformation.py @@ -1,5 +1,6 @@ import collections +import normalization import parsing CIntegerLiteral = collections.namedtuple( @@ -24,6 +25,13 @@ CConstantExpression = collections.namedtuple( ], ) +CVariableExpression = collections.namedtuple( + 'CVariableExpression', + [ + 'variable', + ], +) + CSymbolExpression = collections.namedtuple( 'CSymbolExpression', [ @@ -52,12 +60,13 @@ CFunctionCallExpression = collections.namedtuple( 'CFunctionCallExpression', [ 'name', - 'arguments', + 'argument_count', + 'argument_items', ], ) -CAssignmentStatement = collections.namedtuple( - 'CAssignmentStatement', +CSymbolAssignmentStatement = collections.namedtuple( + 'CSymbolAssignmentStatement', [ 'target', 'target_symbol_list_index', @@ -65,10 +74,66 @@ CAssignmentStatement = collections.namedtuple( ], ) +CArrayVariableInitializationStatement = collections.namedtuple( + 'CArrayVariableInitializationStatement', + [ + 'variable', + 'items', + ], +) + +CVariableInitializationStatement = collections.namedtuple( + 'CVariableInitializationStatement', + [ + 'variable', + 'expression', + ], +) + +CVariableReassignmentStatement = collections.namedtuple( + 'CVariableReassignmentStatement', + [ + 'variable', + 'expression', + ], +) + +CExpressionStatement = collections.namedtuple( + 'CExpressionStatement', + [ + 'expression', + ], +) + +CIfElseStatement = collections.namedtuple( + 'CIfElseStatement', + [ + 'condition_expression', + 'if_statements', + 'else_statements', + ], +) + +CFunctionDeclaration = collections.namedtuple( + 'CFunctionDeclaration', + [ + 'name', + ], +) + +CFunctionDefinition = collections.namedtuple( + 'CFunctionDefinition', + [ + 'name', + 'statement_list', + ], +) + CProgram = collections.namedtuple( 'CProgram', [ 'builtin_set', + 'function_definition_list', 'statements', 'standard_libraries', 'string_literal_list', @@ -85,10 +150,10 @@ EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING = { '>': 'greaterThan', } -def transform_equality_level_expression(accumulators, expression): +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 == '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 ) @@ -124,6 +189,29 @@ BUILTINS = { 'true': [], } +def transform_variable_expression(accumulators, expression): + return CVariableExpression(variable=expression.variable) + +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), + ) + def transform_expression(accumulators, expression): if isinstance(expression, parsing.FurParenthesizedExpression): # Parentheses can be removed because everything in the C output is explicitly parenthesized @@ -165,34 +253,21 @@ def transform_expression(accumulators, expression): if type(expression) in LITERAL_TYPE_MAPPING: return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value) - if isinstance(expression, parsing.FurInfixExpression): - 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', - } - - return CFunctionCallForFurInfixOperator( - name=INFIX_OPERATOR_TO_FUNCTION_NAME[expression.operator], - left=transform_expression(accumulators, expression.left), - right=transform_expression(accumulators, expression.right), - ) - - raise Exception('Could not transform expression "{}"'.format(expression)) - -def transform_assignment_statement(accumulators, assignment_statement): + # TODO Handle all possible types in this form + 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, + }[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: accumulators.symbol_list.append(assignment_statement.target) - return CAssignmentStatement( + return CSymbolAssignmentStatement( target=assignment_statement.target, target_symbol_list_index=accumulators.symbol_list.index(assignment_statement.target), expression=transform_expression( @@ -201,9 +276,9 @@ def transform_assignment_statement(accumulators, assignment_statement): ), ) -def transform_negation_expression(accumulators, negation_expression): +def transform_negation_expression(accumulators, expression): return CNegationExpression( - value=transform_expression(accumulators, negation_expression.value), + value=transform_expression(accumulators, expression.internal_expression), ) def transform_function_call_expression(accumulators, function_call): @@ -211,20 +286,75 @@ def transform_function_call_expression(accumulators, function_call): # 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 - ), - ) + # 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), + ) - raise Exception() +def transform_expression_statement(accumulators, statement): + # TODO At some point we can verify that all expression types are supported and just call transform_expression + expression = { + parsing.FurFunctionCallExpression: transform_function_call_expression, + parsing.FurInfixExpression: transform_expression, + parsing.FurIntegerLiteralExpression: transform_expression, + parsing.FurSymbolExpression: transform_expression, + normalization.NormalFunctionCallExpression: transform_function_call_expression, + normalization.NormalVariableExpression: transform_expression, + }[type(statement.expression)](accumulators, statement.expression) + + return CExpressionStatement( + expression=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), + ) + +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)) + + accumulators.function_definition_list.append(CFunctionDefinition( + name=statement.name, + 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_assignment_statement, - parsing.FurFunctionCallExpression: transform_function_call_expression, + 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, }[type(statement)](accumulators, statement) @@ -232,6 +362,7 @@ Accumulators = collections.namedtuple( 'Accumulators', [ 'builtin_set', + 'function_definition_list', 'symbol_list', 'string_literal_list', ], @@ -240,23 +371,25 @@ Accumulators = collections.namedtuple( def transform(program): accumulators = Accumulators( builtin_set=set(), + function_definition_list=[], symbol_list=[], string_literal_list=[], ) - c_statements = [ + statement_list = [ transform_statement(accumulators, statement) for statement in program.statement_list ] - standard_libraries = set() + standard_library_set = set() for builtin in accumulators.builtin_set: for standard_library in BUILTINS[builtin]: - standard_libraries.add(standard_library) + standard_library_set.add(standard_library) return CProgram( builtin_set=accumulators.builtin_set, - statements=c_statements, - standard_libraries=standard_libraries, + function_definition_list=accumulators.function_definition_list, + statements=statement_list, + standard_libraries=standard_library_set, string_literal_list=accumulators.string_literal_list, symbol_list=accumulators.symbol_list, )