import collections
import normalization
-import parsing
+import parsing # TODO Remove this import, as we should be normalizing everything before it gets here
CIntegerLiteral = collections.namedtuple(
'CIntegerLiteral',
],
)
-CConstantExpression = collections.namedtuple(
- 'CConstantExpression',
- [
- 'value'
- ],
-)
-
CVariableExpression = collections.namedtuple(
'CVariableExpression',
[
CFunctionCallExpression = collections.namedtuple(
'CFunctionCallExpression',
[
- 'name',
+ 'function_expression',
'argument_count',
'argument_items',
],
)
+# TODO We are currently not changing variables, just preventing them from being accessed.
CSymbolAssignmentStatement = collections.namedtuple(
'CSymbolAssignmentStatement',
[
'CIfElseStatement',
[
'condition_expression',
- 'if_statements',
- 'else_statements',
+ 'if_statement_list',
+ 'else_statement_list',
],
)
],
)
+# 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',
],
)
[
'builtin_set',
'function_definition_list',
+ 'operator_declarations',
'statements',
'standard_libraries',
'string_literal_list',
],
)
-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_expression(accumulators, expression):
+ value = expression.string
+
+ 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.symbol in BUILTINS:
+ accumulators.builtin_set.add(expression.symbol)
+
+ 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,
+ )
+
+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_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 == 'comparison_level':
left = transform_comparison_level_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_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)
-
- 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),
- )
-
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',
- }
+ 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_integer_literal_expression(accumulators, expression):
- return CIntegerLiteral(value=expression.value)
+ return CIntegerLiteral(value=expression.integer)
-def transform_parenthesized_expression(accumulators, expression):
- # Parentheses can be removed because everything in the C output is explicitly parenthesized
- return transform_expression(accumulators, expression.internal)
+def transform_negation_expression(accumulators, expression):
+ return CNegationExpression(
+ value=transform_expression(accumulators, expression.internal_expression),
+ )
def transform_expression(accumulators, expression):
# TODO Clean up handlers for parsing expressions
return {
- parsing.FurFunctionCallExpression: transform_function_call_expression,
parsing.FurInfixExpression: transform_infix_expression,
parsing.FurIntegerLiteralExpression: transform_integer_literal_expression,
parsing.FurNegationExpression: transform_negation_expression,
- parsing.FurParenthesizedExpression: transform_parenthesized_expression,
- parsing.FurStringLiteralExpression: transform_string_literal,
- parsing.FurSymbolExpression: transform_symbol_expression,
+ parsing.FurStringLiteralExpression: transform_string_literal_expression,
normalization.NormalFunctionCallExpression: transform_function_call_expression,
normalization.NormalInfixExpression: transform_infix_expression,
+ normalization.NormalIntegerLiteralExpression: transform_integer_literal_expression,
normalization.NormalNegationExpression: transform_negation_expression,
+ normalization.NormalStringLiteralExpression: transform_string_literal_expression,
+ normalization.NormalSymbolExpression: transform_symbol_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, 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,
+ 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):
- # 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,
+ 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):
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)
))
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.NormalAssignmentStatement: transform_symbol_assignment_statement,
normalization.NormalExpressionStatement: transform_expression_statement,
normalization.NormalFunctionDefinitionStatement: transform_function_definition_statement,
normalization.NormalIfElseStatement: transform_if_else_statement,
transform_statement(accumulators, statement) for statement in program.statement_list
]
+ # This prevents warnings about normalized variables being entire C statements
+ last_statement = statement_list[-1]
+ if isinstance(last_statement, normalization.NormalExpressionStatement) and isinstance(last_statement.expression, normalization.NormalVariableExpression):
+ del statement_list[-1]
+
standard_library_set = set()
for builtin in accumulators.builtin_set:
for standard_library in BUILTINS[builtin]:
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,
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