6 CIntegerLiteral = collections.namedtuple(
13 CStringLiteral = collections.namedtuple(
21 CConstantExpression = collections.namedtuple(
22 'CConstantExpression',
28 CVariableExpression = collections.namedtuple(
29 'CVariableExpression',
35 CSymbolExpression = collections.namedtuple(
43 CNegationExpression = collections.namedtuple(
44 'CNegationExpression',
50 CFunctionCallForFurInfixOperator = collections.namedtuple(
51 'CFunctionCallForFurInfixOperator',
59 CFunctionCallExpression = collections.namedtuple(
60 'CFunctionCallExpression',
68 CSymbolAssignmentStatement = collections.namedtuple(
69 'CSymbolAssignmentStatement',
72 'target_symbol_list_index',
77 CArrayVariableInitializationStatement = collections.namedtuple(
78 'CArrayVariableInitializationStatement',
85 CVariableInitializationStatement = collections.namedtuple(
86 'CVariableInitializationStatement',
93 CVariableReassignmentStatement = collections.namedtuple(
94 'CVariableReassignmentStatement',
101 CExpressionStatement = collections.namedtuple(
102 'CExpressionStatement',
108 CIfElseStatement = collections.namedtuple(
111 'condition_expression',
117 CFunctionDeclaration = collections.namedtuple(
118 'CFunctionDeclaration',
124 CFunctionDefinition = collections.namedtuple(
125 'CFunctionDefinition',
132 CProgram = collections.namedtuple(
136 'function_definition_list',
138 'standard_libraries',
139 'string_literal_list',
144 EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING = {
147 '<=': 'lessThanOrEqual',
148 '>=': 'greaterThanOrEqual',
153 def transform_comparison_level_expression(accumulators, expression):
154 # Transform expressions like 1 < 2 < 3 into expressions like 1 < 2 && 2 < 3
155 if isinstance(expression.left, parsing.FurInfixExpression) and expression.left.order == 'comparison_level':
156 left = transform_comparison_level_expression(
163 right = transform_expression(
168 # TODO Don't evaluate the middle expression twice
169 return CFunctionCallForFurInfixOperator(
172 right=CFunctionCallForFurInfixOperator(
173 name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator],
179 return CFunctionCallForFurInfixOperator(
180 name=EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING[expression.operator],
181 left=transform_expression(accumulators, expression.left),
182 right=transform_expression(accumulators, expression.right),
188 'print': ['stdio.h'],
192 def transform_variable_expression(accumulators, expression):
193 return CVariableExpression(variable=expression.variable)
195 def transform_infix_expression(accumulators, expression):
196 if expression.order == 'comparison_level':
197 return transform_comparison_level_expression(accumulators, expression)
199 INFIX_OPERATOR_TO_FUNCTION_NAME = {
203 '//': 'integerDivide',
204 '%': 'modularDivide',
209 return CFunctionCallForFurInfixOperator(
210 name=INFIX_OPERATOR_TO_FUNCTION_NAME[expression.operator],
211 left=transform_expression(accumulators, expression.left),
212 right=transform_expression(accumulators, expression.right),
215 def transform_expression(accumulators, expression):
216 if isinstance(expression, parsing.FurParenthesizedExpression):
217 # Parentheses can be removed because everything in the C output is explicitly parenthesized
218 return transform_expression(accumulators, expression.internal)
220 if isinstance(expression, parsing.FurNegationExpression):
221 return transform_negation_expression(accumulators, expression)
223 if isinstance(expression, parsing.FurFunctionCallExpression):
224 return transform_function_call_expression(accumulators, expression)
226 if isinstance(expression, parsing.FurSymbolExpression):
227 if expression.value in ['true', 'false']:
228 return CConstantExpression(value=expression.value)
230 if expression.value not in accumulators.symbol_list:
231 symbol_list.append(expression.value)
233 return CSymbolExpression(
234 symbol=expression.value,
235 symbol_list_index=accumulators.symbol_list.index(expression.value),
238 if isinstance(expression, parsing.FurStringLiteralExpression):
239 value = expression.value
242 index = accumulators.string_literal_list.index(value)
244 index = len(accumulators.string_literal_list)
245 accumulators.string_literal_list.append(value)
247 return CStringLiteral(index=index, value=value)
249 LITERAL_TYPE_MAPPING = {
250 parsing.FurIntegerLiteralExpression: CIntegerLiteral,
253 if type(expression) in LITERAL_TYPE_MAPPING:
254 return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value)
256 # TODO Handle all possible types in this form
258 parsing.FurInfixExpression: transform_infix_expression, # TODO Shouldn't need this
259 normalization.NormalFunctionCallExpression: transform_function_call_expression,
260 normalization.NormalInfixExpression: transform_infix_expression,
261 normalization.NormalNegationExpression: transform_negation_expression,
262 normalization.NormalVariableExpression: transform_variable_expression,
263 }[type(expression)](accumulators, expression)
265 def transform_symbol_assignment_statement(accumulators, assignment_statement):
266 # TODO Check that target is not a builtin
267 if assignment_statement.target not in accumulators.symbol_list:
268 accumulators.symbol_list.append(assignment_statement.target)
270 return CSymbolAssignmentStatement(
271 target=assignment_statement.target,
272 target_symbol_list_index=accumulators.symbol_list.index(assignment_statement.target),
273 expression=transform_expression(
275 assignment_statement.expression,
279 def transform_negation_expression(accumulators, expression):
280 return CNegationExpression(
281 value=transform_expression(accumulators, expression.internal_expression),
284 def transform_function_call_expression(accumulators, function_call):
285 if function_call.function.value in BUILTINS.keys():
286 # TODO Check that the builtin is actually callable
287 accumulators.builtin_set.add(function_call.function.value)
289 # TODO Use the symbol from SYMBOL LIST
290 return CFunctionCallExpression(
291 name=function_call.function.value,
292 argument_count=function_call.argument_count,
293 argument_items=transform_expression(accumulators, function_call.argument_items),
296 def transform_expression_statement(accumulators, statement):
298 parsing.FurFunctionCallExpression: transform_function_call_expression,
299 parsing.FurIntegerLiteralExpression: transform_expression,
300 normalization.NormalFunctionCallExpression: transform_function_call_expression,
301 }[type(statement.expression)](accumulators, statement.expression)
303 return CExpressionStatement(
304 expression=expression,
307 def transform_if_else_statement(accumulators, statement):
308 return CIfElseStatement(
309 condition_expression=transform_expression(accumulators, statement.condition_expression),
310 if_statements=tuple(transform_statement(accumulators, s) for s in statement.if_statements),
311 else_statements=tuple(transform_statement(accumulators, s) for s in statement.else_statements),
314 def transform_array_variable_initialization_statement(accumulators, statement):
315 return CArrayVariableInitializationStatement(
316 variable=statement.variable,
317 items=tuple(transform_expression(accumulators, i) for i in statement.items),
320 def transform_variable_initialization_statement(accumulators, statement):
321 return CVariableInitializationStatement(
322 variable=statement.variable,
323 expression=transform_expression(accumulators, statement.expression),
326 def transform_variable_reassignment_statement(accumulators, statement):
327 return CVariableReassignmentStatement(
328 variable=statement.variable,
329 expression=transform_expression(accumulators, statement.expression),
332 def transform_function_definition_statement(accumulators, statement):
333 # TODO Allow defining the same function in different contexts
334 if any(fd.name == statement.name for fd in accumulators.function_definition_list):
335 raise Exception('A function with name "{}" already exists'.format(statement.name))
337 accumulators.function_definition_list.append(CFunctionDefinition(
339 statement_list=tuple(transform_statement(accumulators, s) for s in statement.statement_list)
342 return CFunctionDeclaration(name=statement.name)
344 def transform_statement(accumulators, statement):
346 parsing.FurAssignmentStatement: transform_symbol_assignment_statement,
347 parsing.FurExpressionStatement: transform_expression_statement,
348 normalization.NormalArrayVariableInitializationStatement: transform_array_variable_initialization_statement,
349 normalization.NormalExpressionStatement: transform_expression_statement,
350 normalization.NormalFunctionDefinitionStatement: transform_function_definition_statement,
351 normalization.NormalIfElseStatement: transform_if_else_statement,
352 normalization.NormalVariableInitializationStatement: transform_variable_initialization_statement,
353 normalization.NormalVariableReassignmentStatement: transform_variable_reassignment_statement,
354 }[type(statement)](accumulators, statement)
357 Accumulators = collections.namedtuple(
361 'function_definition_list',
363 'string_literal_list',
367 def transform(program):
368 accumulators = Accumulators(
370 function_definition_list=[],
372 string_literal_list=[],
376 transform_statement(accumulators, statement) for statement in program.statement_list
379 standard_library_set = set()
380 for builtin in accumulators.builtin_set:
381 for standard_library in BUILTINS[builtin]:
382 standard_library_set.add(standard_library)
385 builtin_set=accumulators.builtin_set,
386 function_definition_list=accumulators.function_definition_list,
387 statements=statement_list,
388 standard_libraries=standard_library_set,
389 string_literal_list=accumulators.string_literal_list,
390 symbol_list=accumulators.symbol_list,
394 if __name__ == '__main__':