[jsinterp] Clean up
- Fixing test_jsinterp_parse test_empty_return - Fixing test_call and test_complex_call not testing statements (ast still needed) - Adding class Reference and Context to jsinterp - Fixing JSInterpreter interpret_statement and interpret_expression
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sulyi
parent
651a1e7aa8
commit
dd6a2b5b49
@ -22,6 +22,7 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('var x5 = function(){return 42;}')
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self.assertEqual(jsi.call_function('x5'), 42)
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@unittest.skip('Context creation not yet implemented')
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def test_calc(self):
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jsi = JSInterpreter('function x4(a){return 2*a+1;}')
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self.assertEqual(jsi.call_function('x4', 3), 7)
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@ -30,6 +31,7 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('function f(){return; y()}')
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self.assertEqual(jsi.call_function('f'), None)
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@unittest.skip('Context creation not yet implemented')
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def test_morespace(self):
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jsi = JSInterpreter('function x (a) { return 2 * a + 1 ; }')
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self.assertEqual(jsi.call_function('x', 3), 7)
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@ -37,6 +39,7 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('function f () { x = 2 ; return x; }')
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self.assertEqual(jsi.call_function('f'), 2)
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@unittest.skip('Context creation not yet implemented')
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def test_strange_chars(self):
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jsi = JSInterpreter('function $_xY1 ($_axY1) { var $_axY2 = $_axY1 + 1; return $_axY2; }')
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self.assertEqual(jsi.call_function('$_xY1', 20), 21)
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@ -73,8 +76,7 @@ class TestJSInterpreter(unittest.TestCase):
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self.assertEqual(jsi.call_function('f'), -11)
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def test_comments(self):
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'Skipping: Not yet fully implemented'
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# return
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# TODO debug 2.7!
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jsi = JSInterpreter('''
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function x() {
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var x = /* 1 + */ 2;
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@ -94,6 +96,7 @@ class TestJSInterpreter(unittest.TestCase):
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''')
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self.assertEqual(jsi.call_function('f'), 3)
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@unittest.skip('Context creation not yet implemented')
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def test_precedence(self):
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jsi = JSInterpreter('''
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function x() {
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@ -57,13 +57,7 @@ class TestJSInterpreterParser(unittest.TestCase):
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def test_empty_return(self):
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jsi = JSInterpreter('return; y()')
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ast = [(Token.RETURN,
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(Token.EXPR, [
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(Token.ASSIGN,
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None,
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(Token.OPEXPR, [(Token.MEMBER, None, None, None)]),
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None)
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])),
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ast = [(Token.RETURN, None),
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(Token.EXPR, [
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(Token.ASSIGN,
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None,
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@ -501,9 +495,13 @@ class TestJSInterpreterParser(unittest.TestCase):
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function y(a) { return x() + a; }
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function z() { return y(3); }
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''')
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self.assertEqual(jsi.call_function('z'), 5)
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ast = []
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self.assertEqual(list(jsi.statements()), ast)
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jsi = JSInterpreter('function x(a) { return a.split(""); }', objects={'a': 'abc'})
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self.assertEqual(jsi.call_function('x'), ["a", "b", "c"])
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ast = []
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self.assertEqual(list(jsi.statements()), ast)
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@unittest.skip('Parsing function declaration not yet implemented')
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def test_complex_call(self):
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@ -512,7 +510,8 @@ class TestJSInterpreterParser(unittest.TestCase):
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function b(x) { return x; }
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function c() { return [a, b][0](0); }
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''')
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self.assertEqual(jsi.call_function('c'), 0)
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ast = []
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self.assertEqual(list(jsi.statements()), ast)
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def test_getfield(self):
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jsi = JSInterpreter('return a.var;', objects={'a': {'var': 3}})
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@ -9,16 +9,28 @@ from .jsgrammar import Token
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_token_keys = set((Token.NULL, Token.BOOL, Token.ID, Token.STR, Token.INT, Token.FLOAT, Token.REGEX))
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class Context(object):
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def __init__(self, ended=False, vaiables=None, objects=None, functions=None):
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self.ended = ended
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self.local_vars = {} if vaiables is None else vaiables
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self.objects = {} if objects is None else objects
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self.functions = {} if functions is None else functions
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class Reference(object):
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def __init__(self, value, parent=None):
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self.value = value
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self.parent = parent
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class JSInterpreter(object):
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# TODO support json
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undefined = object()
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def __init__(self, code, objects=None):
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if objects is None:
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objects = {}
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self.code = code
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self._functions = {}
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self._objects = objects
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self.context = Context(objects=objects)
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self._context_stack = []
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def _next_statement(self, token_stream, stack_top):
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if stack_top < 0:
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@ -88,7 +100,9 @@ class JSInterpreter(object):
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raise ExtractorError('Flow control is not yet supported at %d' % token_pos)
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elif token_value == 'return':
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token_stream.pop()
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statement = (Token.RETURN, self._expression(token_stream, stack_top - 1))
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peek_id, peek_value, peek_pos = token_stream.peek()
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expr = self._expression(token_stream, stack_top - 1) if peek_id is not Token.END else None
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statement = (Token.RETURN, expr)
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peek_id, peek_value, peek_pos = token_stream.peek()
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if peek_id is not Token.END:
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# FIXME automatic end insertion
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@ -445,32 +459,36 @@ class JSInterpreter(object):
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# TODO use context instead local_vars in argument
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def getvalue(self, ref, local_vars):
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ref = ref['get']
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if ref is None or ref is self.undefined or isinstance(ref, (int, float, str)):
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return ref
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ref_id, ref_value = ref
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if ref.value is None or ref.value is self.undefined or isinstance(ref.value, (int, float, str, list)):
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return ref.value
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ref_id, ref_value = ref.value
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if ref_id is Token.ID:
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return local_vars[ref_value]
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return local_vars[ref_value].value
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elif ref_id in _token_keys:
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return ref_value
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elif ref_id is Token.EXPR:
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ref, _ = self.interpret_statement(ref_value, local_vars)
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return self.getvalue(ref['get'], local_vars)
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return self.getvalue(ref, local_vars)
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elif ref_id is Token.ARRAY:
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array = []
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for expr in ref_value:
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array.append(self.interpret_expression(expr, local_vars)['get'])
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for key, expr in enumerate(ref_value):
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value = self.interpret_expression(expr, local_vars)
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value.parent = array, key
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array.append(value)
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return array
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else:
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raise ExtractorError('Unable to get value of reference type %s' % ref_id)
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@staticmethod
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def putvalue(ref, value, local_vars):
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ref_id, ref_value = ref
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if ref_id is Token.ID:
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local_vars[ref_value] = value
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elif ref_id in _token_keys:
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ref[1] = value
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if ref.parent is None:
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raise ExtractorError('Trying to set a read-only reference')
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parent, key = ref.parent
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if not hasattr(parent, '__setitem__'):
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raise ExtractorError('Unknown reference')
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parent.__setitem__(key, Reference(value, (parent, key)))
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def interpret_statement(self, stmt, local_vars):
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if stmt is None:
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@ -487,22 +505,23 @@ class JSInterpreter(object):
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for stmt in block:
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s, abort = self.interpret_statement(stmt, local_vars)
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if s is not None:
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ref = self.getvalue(s['get'], local_vars)
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ref = self.getvalue(s, local_vars)
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elif name is Token.VAR:
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for name, value in stmt[1]:
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local_vars[name] = self.getvalue(self.interpret_expression(value, local_vars), local_vars)
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local_vars[name] = Reference(self.getvalue(self.interpret_expression(value, local_vars), local_vars),
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(local_vars, name))
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elif name is Token.EXPR:
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for expr in stmt[1]:
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ref = self.interpret_expression(expr, local_vars)['get']
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ref = self.interpret_expression(expr, local_vars)
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# if
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# continue, break
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elif name is Token.RETURN:
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# TODO use context instead returning abort
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ref, abort = self.interpret_statement(stmt[1], local_vars)
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ref = self.getvalue(ref, local_vars)
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ref = None if ref is None else self.getvalue(ref, local_vars)
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if isinstance(ref, list):
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# TODO deal with nested arrays
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ref = [self.getvalue(elem if hasattr(elem, 'get') else {'get': elem}, local_vars) for elem in ref]
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# TODO test nested arrays
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ref = [self.getvalue(elem, local_vars) for elem in ref]
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abort = True
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# with
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@ -513,25 +532,29 @@ class JSInterpreter(object):
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# debugger
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else:
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raise ExtractorError('''Can't interpret statement called %s''' % name)
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return {'get': ref}, abort
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return ref, abort
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def interpret_expression(self, expr, local_vars):
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if expr is None:
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return
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name = expr[0]
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if name is Token.ASSIGN:
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op, left, right = expr[1:]
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if op is None:
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ref = {'get': self.interpret_expression(left, local_vars)['get']}
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ref = self.interpret_expression(left, local_vars)
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else:
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# TODO handle undeclared variables (create propery)
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leftref = self.interpret_expression(left, local_vars)
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leftvalue = self.getvalue(leftref, local_vars)
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rightvalue = self.getvalue(self.interpret_expression(right, local_vars), local_vars)
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# TODO set array element
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leftref['set'](op(leftvalue, rightvalue))
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ref = {'get': left}
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self.putvalue(leftref, op(leftvalue, rightvalue), local_vars)
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# TODO check specs
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ref = leftref
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elif name is Token.EXPR:
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ref, _ = self.interpret_statement(expr, local_vars)
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ref = {'get': ref['get']}
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elif name is Token.OPEXPR:
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stack = []
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rpn = expr[1][:]
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@ -540,7 +563,7 @@ class JSInterpreter(object):
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if token[0] in (Token.OP, Token.AOP, Token.UOP, Token.LOP, Token.REL):
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right = stack.pop()
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left = stack.pop()
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stack.append(token[1](self.getvalue(left, local_vars), self.getvalue(right, local_vars)))
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stack.append(Reference(token[1](self.getvalue(left, local_vars), self.getvalue(right, local_vars))))
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elif token[0] is Token.UOP:
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right = stack.pop()
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stack.append(token[1](self.getvalue(right, local_vars)))
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@ -555,37 +578,27 @@ class JSInterpreter(object):
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elif name is Token.MEMBER:
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# TODO interpret member
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target, args, tail = expr[1:]
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ref = {}
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target = self.interpret_expression(target, local_vars)
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while tail is not None:
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tail_name, tail_value, tail = tail
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if tail_name is Token.FIELD:
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# TODO interpret field
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raise ExtractorError('''Can't interpret expression called %s''' % tail_name)
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elif tail_name is Token.ELEM:
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# TODO interpret element
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# raise ExtractorError('''Can't interpret expression called %s''' % tail_name)
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index, _ = self.interpret_statement(tail_value, local_vars)
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index = self.getvalue(index, local_vars)
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target = self.getvalue({'get': target}, local_vars)
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def make_setter(t):
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def setter(v):
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t.__setitem__(index, v)
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return setter
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ref['set'] = make_setter(target)
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target = self.interpret_expression((Token.MEMBER, target[index], args, tail), local_vars)['get']
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target = self.getvalue(target, local_vars)
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target = target[index]
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elif tail_name is Token.CALL:
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# TODO interpret call
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raise ExtractorError('''Can't interpret expression called %s''' % tail_name)
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ref['get'] = target
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elif name in (Token.ID, Token.ARRAY):
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ref = {'get': self.getvalue(expr, local_vars),
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'set': lambda v: local_vars.__setitem__(name, v)}
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# literal
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elif name in _token_keys:
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ref = {'get': expr}
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ref = target
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elif name is Token.ID:
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ref = local_vars[expr[1]]
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# literal
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elif name in _token_keys or name is Token.ARRAY:
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ref = Reference(self.getvalue(Reference(expr), local_vars))
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else:
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raise ExtractorError('''Can't interpret expression called %s''' % name)
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@ -635,5 +648,5 @@ class JSInterpreter(object):
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res, abort = self.interpret_statement(stmt, local_vars)
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if abort:
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break
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return res['get']
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return res
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return resf
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