import parsing
+CIntegerLiteral = collections.namedtuple(
+ 'CIntegerLiteral',
+ [
+ 'value',
+ ],
+)
+
CStringLiteral = collections.namedtuple(
'CStringLiteral',
[
],
)
-CFunctionCallStatement = collections.namedtuple(
- 'CFunctionCallStatement',
+CConstantExpression = collections.namedtuple(
+ 'CConstantExpression',
+ [
+ 'value'
+ ],
+)
+
+CSymbolExpression = collections.namedtuple(
+ 'CSymbolExpression',
+ [
+ 'symbol',
+ 'symbol_list_index',
+ ],
+)
+
+CNegationExpression = collections.namedtuple(
+ 'CNegationExpression',
+ [
+ 'value',
+ ],
+)
+
+CFunctionCallForFurInfixOperator = collections.namedtuple(
+ 'CFunctionCallForFurInfixOperator',
+ [
+ 'name',
+ 'left',
+ 'right',
+ ],
+)
+
+CFunctionCallExpression = collections.namedtuple(
+ 'CFunctionCallExpression',
[
'name',
'arguments',
],
)
+CAssignmentStatement = collections.namedtuple(
+ 'CAssignmentStatement',
+ [
+ 'target',
+ 'target_symbol_list_index',
+ 'expression',
+ ],
+)
+
CProgram = collections.namedtuple(
'CProgram',
[
'builtins',
'statements',
'standard_libraries',
+ 'symbol_list',
],
)
+EQUALITY_LEVEL_OPERATOR_TO_FUNCTION_NAME_MAPPING = {
+ '==': 'equals',
+ '!=': 'notEquals',
+ '<=': 'lessThanOrEqual',
+ '>=': 'greaterThanOrEqual',
+ '<': 'lessThan',
+ '>': 'greaterThan',
+}
+
+def transform_equality_level_expression(builtin_dependencies, symbol_list, 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(
+ builtin_dependencies,
+ symbol_list,
+ expression.left
+ )
+
+ middle = left.right
+
+ right = transform_expression(
+ builtin_dependencies,
+ symbol_list,
+ 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(builtin_dependencies, symbol_list, expression.left),
+ right=transform_expression(builtin_dependencies, symbol_list, expression.right),
+ )
+
BUILTINS = {
- 'print': ['stdio.h.'],
+ 'false': [],
+ 'pow': ['math.h'],
+ 'print': ['stdio.h'],
+ 'true': [],
}
-def transform_argument(builtin_dependencies, argument):
- if isinstance(argument, parsing.StringLiteral):
- return CStringLiteral(value=argument.value)
+def transform_expression(builtin_dependencies, symbol_list, expression):
+ if isinstance(expression, parsing.FurParenthesizedExpression):
+ # Parentheses can be removed because everything in the C output is explicitly parenthesized
+ return transform_expression(builtin_dependencies, symbol_list, expression.internal)
- raise Exception()
+ if isinstance(expression, parsing.FurNegationExpression):
+ return transform_negation_expression(builtin_dependencies, symbol_list, expression)
+
+ if isinstance(expression, parsing.FurFunctionCallExpression):
+ return transform_function_call_expression(builtin_dependencies, symbol_list, expression)
+
+ if isinstance(expression, parsing.FurSymbolExpression):
+ if expression.value in ['true', 'false']:
+ return CConstantExpression(value=expression.value)
+
+ if expression.value not in symbol_list:
+ symbol_list.append(expression.value)
+
+ return CSymbolExpression(
+ symbol=expression.value,
+ symbol_list_index=symbol_list.index(expression.value),
+ )
+
+ LITERAL_TYPE_MAPPING = {
+ parsing.FurIntegerLiteralExpression: CIntegerLiteral,
+ parsing.FurStringLiteralExpression: CStringLiteral,
+ }
+
+ 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(builtin_dependencies, symbol_list, 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(builtin_dependencies, symbol_list, expression.left),
+ right=transform_expression(builtin_dependencies, symbol_list, expression.right),
+ )
-def transform_function_call_statement(builtin_dependencies, function_call):
- if function_call.name in BUILTINS.keys():
- builtin_dependencies.add(function_call.name)
+ raise Exception('Could not transform expression "{}"'.format(expression))
+
+def transform_assignment_statement(builtin_dependencies, symbol_list, assignment_statement):
+ # TODO Check that target is not a builtin
+ if assignment_statement.target not in symbol_list:
+ symbol_list.append(assignment_statement.target)
+
+ return CAssignmentStatement(
+ target=assignment_statement.target,
+ target_symbol_list_index=symbol_list.index(assignment_statement.target),
+ expression=transform_expression(
+ builtin_dependencies,
+ symbol_list,
+ assignment_statement.expression,
+ ),
+ )
+
+def transform_negation_expression(builtin_dependencies, symbol_list, negation_expression):
+ return CNegationExpression(
+ value=transform_expression(builtin_dependencies, symbol_list, negation_expression.value),
+ )
- return CFunctionCallStatement(
- name='builtin$' + function_call.name,
- arguments=tuple(transform_argument(builtin_dependencies, arg) for arg in function_call.arguments),
+def transform_function_call_expression(builtin_dependencies, symbol_list, function_call):
+ if function_call.function.value in BUILTINS.keys():
+ # TODO Check that the builtin is actually callable
+ builtin_dependencies.add(function_call.function.value)
+
+ return CFunctionCallExpression(
+ name='builtin$' + function_call.function.value,
+ arguments=tuple(
+ transform_expression(builtin_dependencies, symbol_list, arg)
+ for arg in function_call.arguments
+ ),
)
raise Exception()
+def transform_statement(builtin_dependencies, symbol_list, statement):
+ return {
+ parsing.FurAssignmentStatement: transform_assignment_statement,
+ parsing.FurFunctionCallExpression: transform_function_call_expression,
+ }[type(statement)](builtin_dependencies, symbol_list, statement)
-def transform(function_call):
+def transform(program):
builtins = set()
+ symbol_list = []
- statement = transform_function_call_statement(builtins, function_call)
+ c_statements = [
+ transform_statement(builtins, symbol_list, statement) for statement in program.statement_list
+ ]
standard_libraries = set()
for builtin in builtins:
return CProgram(
builtins=builtins,
- statements=[statement],
+ statements=c_statements,
standard_libraries=standard_libraries,
+ symbol_list=symbol_list,
)
projects / fur / blobdiff