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+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+ Preamble
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+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
--- /dev/null
+#!/usr/bin/env python
+
+'''
+To run this file:
+
+ python stutter.py stutter_code.stt > c_code.c
+'''
+
+import re
+import string
+
+# Utility functions
+
+def is_integer(s_expression):
+ return isinstance(s_expression, int) \
+ and not s_expression is True \
+ and not s_expression is False
+
+# String to s-expressions
+
+TOKEN = re.compile(r'\s*({})'.format('|'.join('(?P<{}>{})'.format(*token) for token in [
+ ('open_parenthese', r'\('),
+ ('close_parenthese', r'\)'),
+ ('integer_literal', r'\d+'),
+ ('unexpected_character', r'.'),
+])))
+
+def parse_all(source):
+ stack = []
+ items = []
+
+ for token in TOKEN.finditer(source):
+ if token.group('open_parenthese'):
+ stack.append(items)
+ items = []
+
+ elif token.group('close_parenthese'):
+ if len(stack) == 0:
+ raise Exception('Parenthese closed but not opened')
+
+ stack[-1].append(tuple(items))
+ items = stack.pop()
+
+ elif token.group('integer_literal'):
+ items.append(int(token.group('integer_literal')))
+
+ elif token.group('unexpected_character'):
+ raise Exception('Unexpected character {}'.format(
+ token.group('unexpected_character'),
+ ))
+
+ else:
+ raise Exception()
+
+
+ if len(stack) > 0:
+ raise Exception('Parenthese opened but not closed')
+
+ return items
+
+# C AST Objects
+
+class CType(object):
+ def __init__(self, name):
+ self.name = name
+
+class CPointerType(CType):
+ def __init__(self, pointer_to):
+ self.pointer_to = pointer_to
+
+class CArgumentDeclaration(object):
+ def __init__(self, type, name):
+ assert isinstance(type, CType)
+ self.type = type
+ self.name = name
+
+class CExpression(object):
+ pass
+
+class CIntegerLiteralExpression(CExpression):
+ def __init__(self, integer):
+ assert isinstance(integer, int)
+
+ # Booleans in Python are integers but we don't want them
+ assert not integer is True
+ assert not integer is False
+
+ self.integer = integer
+
+class CFunctionCallExpression(CExpression):
+ def __init__(self, name, arguments):
+ assert all(isinstance(argument, CExpression) for argument in arguments)
+ self.name = name
+ self.arguments = arguments
+
+class CStatement(object):
+ pass
+
+class CExpressionStatement(CStatement):
+ def __init__(self, expression):
+ self.expression = expression
+
+class CReturnStatement(CStatement):
+ def __init__(self, expression):
+ self.expression = expression
+
+class CFunctionDeclaration(object):
+ def __init__(self, return_type, name, argument_declaration_list, body):
+ assert isinstance(return_type, CType)
+ assert isinstance(argument_declaration_list, list)
+ assert all(isinstance(ad, CArgumentDeclaration) for ad in argument_declaration_list)
+ assert isinstance(body, list)
+ assert all(isinstance(s, CStatement) for s in body)
+
+ self.return_type = return_type
+ self.name = name
+ self.argument_declaration_list = argument_declaration_list
+ self.body = body
+
+# BEGIN S-expression to C AST layer
+
+def evaluate_to_c(s_expression):
+ if is_integer(s_expression):
+ return CIntegerLiteralExpression(s_expression)
+
+ raise Exception('Unable to evaluate expression {} to C'.format(s_expression))
+
+def evaluate_all_to_c(s_expressions):
+ c_expressions = list(map(evaluate_to_c, s_expressions))
+ body = list(map(CExpressionStatement, c_expressions[:-1])) + [CReturnStatement(c_expressions[-1])]
+
+ return CFunctionDeclaration(
+ CType('int'),
+ 'main',
+ [
+ CArgumentDeclaration(CType('int'), 'argc'),
+ CArgumentDeclaration(CPointerType(CPointerType(CType('char'))), 'argv'),
+ ],
+ body,
+ )
+
+# BEGIN C AST to C source layer
+
+TAB_WIDTH = 2
+
+def indent(string):
+ assert isinstance(string, str)
+
+ def indent_line(line):
+ line = line.rstrip()
+
+ if line == '':
+ return line
+
+ return ' ' * TAB_WIDTH + line
+
+ return '\n'.join(indent_line(line) for line in string.splitlines())
+
+def generate_pointer_type(pointer_type):
+ assert isinstance(pointer_type, CPointerType)
+ return '{}*'.format(generate_type(pointer_type.pointer_to))
+
+def generate_type(
+ type,
+ generate_pointer_type = generate_pointer_type):
+ assert isinstance(type, CType)
+
+ if isinstance(type, CPointerType):
+ return generate_pointer_type(type)
+
+ return type.name
+
+def generate_argument_declaration(argument_declaration):
+ assert isinstance(argument_declaration, CArgumentDeclaration)
+ return '{} {}'.format(generate_type(argument_declaration.type), argument_declaration.name)
+
+def generate_argument_declaration_list(argument_declarations):
+ return ', '.join(generate_argument_declaration(ad) for ad in argument_declarations)
+
+def generate_integer_literal_expression(expression):
+ assert isinstance(expression, CIntegerLiteralExpression)
+ return str(expression.integer)
+
+def generate_function_call_expression(expression):
+ assert isinstance(expression, CFunctionCallExpression)
+ return '{}({})'.format(
+ expression.name,
+ ', '.join(generate_expression(e) for e in expression.arguments),
+ )
+
+def generate_expression(
+ expression,
+ generate_integer_literal_expression = generate_integer_literal_expression,
+ generate_function_call_expression = generate_function_call_expression,
+ ):
+
+ if isinstance(expression, CIntegerLiteralExpression):
+ return generate_integer_literal_expression(expression)
+
+ if isinstance(expression, CFunctionCallExpression):
+ return generate_function_call_expression(expression)
+
+ raise Exception('Expression type {} not implemented'.format(type(expression)))
+
+def generate_expression_statement(statement):
+ return '{};'.format(generate_expression(statement.expression))
+
+def generate_return_statement(statement):
+ return 'return {};'.format(generate_expression(statement.expression))
+
+def generate_statement(
+ statement,
+ generate_expression_statement = generate_expression_statement,
+ generate_return_statement = generate_return_statement):
+
+ if isinstance(statement, CExpressionStatement):
+ return generate_expression_statement(statement)
+
+ if isinstance(statement, CReturnStatement):
+ return generate_return_statement(statement)
+
+ raise Exception('Handling for statements of type {} not implemented'.format(type(statement.type)))
+
+def generate_statement_list(statements):
+ assert all(isinstance(s, CStatement) for s in statements)
+ return '\n'.join(generate_statement(s) for s in statements)
+
+FUNCTION_DEFINITION_TEMPLATE = string.Template(
+'''
+$return_type $name($argument_declaration_list)
+{
+$body
+}
+'''.strip())
+
+def generate_function_declaration(function_declaration):
+ assert isinstance(function_declaration, CFunctionDeclaration)
+ return FUNCTION_DEFINITION_TEMPLATE.substitute(
+ return_type = generate_type(function_declaration.return_type),
+ name = function_declaration.name,
+ argument_declaration_list = generate_argument_declaration_list(function_declaration.argument_declaration_list),
+ body = indent(generate_statement_list(function_declaration.body)),
+ )
+
+if __name__ == '__main__':
+ import sys
+ source_file_name = sys.argv[1]
+
+ with open(source_file_name, 'r') as source_file:
+ source = source_file.read()
+
+ result = generate_function_declaration(evaluate_all_to_c(parse_all(source)))
+ print(result)
--- /dev/null
+#!/usr/bin/env python
+
+import stutter
+import unittest
+
+class IsIntegerTests(unittest.TestCase):
+ def test_returns_true_for_integers(self):
+ for i in range(10):
+ self.assertTrue(stutter.is_integer(i))
+
+ def test_returns_false_for_booleans(self):
+ self.assertFalse(stutter.is_integer(True))
+ self.assertFalse(stutter.is_integer(False))
+
+ def test_returns_false_for_other_types(self):
+ for o in [object(), '', 0.1, [], (), {}, set()]:
+ self.assertFalse(stutter.is_integer(o))
+
+class ParseAllTests(unittest.TestCase):
+ def test_parses_integers(self):
+ expected = [0]
+ actual = stutter.parse_all('0')
+
+ self.assertEqual(expected, actual)
+
+ def test_parses_empty_s_expressions(self):
+ expected = [()]
+ actual = stutter.parse_all('()')
+
+ self.assertEqual(expected, actual)
+
+ def test_parses_s_expressions(self):
+ expected = [(0, 1, 2)]
+ actual = stutter.parse_all('(0 1 2)')
+
+ self.assertEqual(expected, actual)
+
+ def test_parses_nested_s_expressions(self):
+ expected = [(0, (1, (2,)))]
+ actual = stutter.parse_all('(0 (1 (2)))')
+
+ self.assertEqual(expected, actual)
+
+ def test_parses_multiple_expressions(self):
+ expected = [0, ()]
+ actual = stutter.parse_all('0 ()')
+
+ self.assertEqual(expected, actual)
+
+ def test_raises_exception_for_unclosed_parenthese(self):
+ self.assertRaises(Exception, stutter.parse_all, '(')
+
+ def test_raises_exception_for_unopened_parenthese(self):
+ self.assertRaises(Exception, stutter.parse_all, ')')
+
+class EvaluateToCTests(unittest.TestCase):
+ def test_evaluates_integers(self):
+ for i in range(5):
+ result = stutter.evaluate_to_c(i)
+ self.assertIsInstance(result, stutter.CIntegerLiteralExpression)
+ self.assertEqual(result.integer, i)
+
+class EvaluateAllToCTests(unittest.TestCase):
+ def test_returns_main(self):
+ result = stutter.evaluate_all_to_c([0])
+
+ self.assertIsInstance(result, stutter.CFunctionDeclaration)
+ self.assertEqual(result.name, 'main')
+
+ def test_main_contains_expression_statements_followed_by_return_statement(self):
+ result = stutter.evaluate_all_to_c([0,0,0])
+
+ self.assertIsInstance(result.body[0],stutter.CExpressionStatement)
+ self.assertIsInstance(result.body[1],stutter.CExpressionStatement)
+ self.assertIsInstance(result.body[2],stutter.CReturnStatement)
+
+class IndentTests(unittest.TestCase):
+ def test_indents_single_line(self):
+ expected = ' Hello, world'
+ actual = stutter.indent('Hello, world')
+ self.assertEqual(expected, actual)
+
+ def test_indents_multiple_lines(self):
+ expected = ' Hello, world\n Goodbye, cruel world'
+ actual = stutter.indent('Hello, world\nGoodbye, cruel world')
+ self.assertEqual(expected, actual)
+
+ def test_leaves_empty_lines_empty(self):
+ expected = ' Hello, world\n\n Goodbye, cruel world'
+ actual = stutter.indent('Hello, world\n \nGoodbye, cruel world')
+ self.assertEqual(expected, actual)
+
+ def test_indents_already_indented_lines(self):
+ expected = ' Hello, world\n\n Goodbye, cruel world'
+ actual = stutter.indent(' Hello, world\n \n Goodbye, cruel world')
+ self.assertEqual(expected, actual)
+
+class GeneratePointerTypeTests(unittest.TestCase):
+ def test_basic(self):
+ expected = 'int*'
+ actual = stutter.generate_pointer_type(stutter.CPointerType(stutter.CType('int')))
+ self.assertEqual(expected, actual)
+
+class GenerateTypeTests(unittest.TestCase):
+ def test_basic(self):
+ expected = 'int'
+ actual = stutter.generate_type(stutter.CType('int'))
+ self.assertEqual(expected, actual)
+
+ def test_generates_pointer_types(self):
+ expected = object()
+ actual = stutter.generate_type(
+ stutter.CPointerType(stutter.CType('int')),
+ generate_pointer_type = lambda x : expected)
+
+ self.assertIs(expected, actual)
+
+class GenerateArgumentDeclarationTests(unittest.TestCase):
+ def test_basic(self):
+ expected = 'int argc'
+ actual = stutter.generate_argument_declaration(
+ stutter.CArgumentDeclaration(stutter.CType('int'), 'argc'))
+ self.assertEqual(expected, actual)
+
+class GenerateArgumentDeclarationListTests(unittest.TestCase):
+ def test_basic(self):
+ argument_declarations = [
+ stutter.CArgumentDeclaration(stutter.CType('int'),'argc'),
+ stutter.CArgumentDeclaration(stutter.CPointerType(stutter.CPointerType(stutter.CType('char'))), 'argv'),
+ ]
+ expected = 'int argc, char** argv'
+ actual = stutter.generate_argument_declaration_list(argument_declarations)
+ self.assertEqual(expected, actual)
+
+class GenerateIntegerLiteralExpressionTests(unittest.TestCase):
+ def test_basic(self):
+ expected = '0'
+ actual = stutter.generate_integer_literal_expression(
+ stutter.CIntegerLiteralExpression(0),
+ )
+ self.assertEqual(expected, actual)
+
+class GenerateFunctionCallExpressionTests(unittest.TestCase):
+ def test_no_arguments(self):
+ expected = 'name()'
+ actual = stutter.generate_function_call_expression(
+ stutter.CFunctionCallExpression('name', []),
+ )
+ self.assertEqual(expected, actual)
+
+ def test_one_argument(self):
+ expected = 'name(0)'
+ actual = stutter.generate_function_call_expression(
+ stutter.CFunctionCallExpression(
+ 'name',
+ [
+ stutter.CIntegerLiteralExpression(0),
+ ],
+ ),
+ )
+ self.assertEqual(expected, actual)
+
+ def test_many_arguments(self):
+ expected = 'name(0, 1)'
+ actual = stutter.generate_function_call_expression(
+ stutter.CFunctionCallExpression(
+ 'name',
+ [
+ stutter.CIntegerLiteralExpression(0),
+ stutter.CIntegerLiteralExpression(1),
+ ],
+ ),
+ )
+ self.assertEqual(expected, actual)
+
+class GenerateExpressionTests(unittest.TestCase):
+ def test_generates_integer_literal_expressions(self):
+ expected = object()
+ actual = stutter.generate_expression(
+ stutter.CIntegerLiteralExpression(0),
+ generate_integer_literal_expression = lambda x : expected)
+
+ self.assertIs(expected, actual)
+
+ def test_generates_function_call_expression(self):
+ expected = object()
+ actual = stutter.generate_expression(
+ stutter.CFunctionCallExpression('name',[]),
+ generate_function_call_expression = lambda x : expected)
+
+ self.assertIs(expected, actual)
+
+class GenerateStatement(unittest.TestCase):
+ def test_generates_expression_statement(self):
+ return_statement = stutter.CExpressionStatement('0')
+
+ expected = object()
+ actual = stutter.generate_statement(
+ return_statement,
+ generate_expression_statement = lambda _ : expected)
+
+ self.assertIs(expected, actual)
+
+ def test_generates_return_statement(self):
+ return_statement = stutter.CReturnStatement(stutter.CIntegerLiteralExpression(0))
+
+ expected = object()
+ actual = stutter.generate_statement(
+ return_statement,
+ generate_return_statement = lambda _ : expected)
+
+ self.assertIs(expected, actual)
+
+class GenerateExpressionStatementTests(unittest.TestCase):
+ def test_generates_return_statement(self):
+ expression_statement = stutter.CExpressionStatement(stutter.CIntegerLiteralExpression(0))
+
+ expected = '0;'
+ actual = stutter.generate_expression_statement(expression_statement)
+
+ self.assertEqual(expected, actual)
+
+class GenerateReturnStatementTests(unittest.TestCase):
+ def test_generates_return_statement(self):
+ return_statement = stutter.CReturnStatement(stutter.CIntegerLiteralExpression(0))
+
+ expected = 'return 0;'
+ actual = stutter.generate_return_statement(return_statement)
+
+ self.assertEqual(expected, actual)
+
+class GenerateFunctionDeclarationTests(unittest.TestCase):
+ def test_basic(self):
+ return_type = stutter.CType('int')
+ argument_declarations = [
+ stutter.CArgumentDeclaration(stutter.CType('int'),'argc'),
+ stutter.CArgumentDeclaration(stutter.CPointerType(stutter.CPointerType(stutter.CType('char'))), 'argv'),
+ ]
+
+ function_declaration = stutter.CFunctionDeclaration(
+ return_type,
+ 'main',
+ argument_declarations,
+ [stutter.CReturnStatement(stutter.CIntegerLiteralExpression(0))])
+
+ expected = 'int main(int argc, char** argv)\n{\n return 0;\n}'
+ actual = stutter.generate_function_declaration(function_declaration)
+ self.assertEqual(expected, actual)
+
+unittest.main()
projects / sandbox / commitdiff