How to use has_custom_message method in Slash

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check_funcs.py

Source:check_funcs.py

1import re2from functools import partial, wraps3from protowhat.Feedback import Feedback4MSG_CHECK_FALLBACK = "Your submission is incorrect. Try again!"5DEFAULT_MISSING_MSG = "Could not find the {index}{node_name}."6DEFAULT_APPEND_MSG = "Check the {index}{node_name}. "7def requires_ast(f):8    @wraps(f)9    def wrapper(*args, **kwargs):10        state = kwargs.get("state", args[0] if len(args) else None)11        state_ast = [state.student_ast, state.solution_ast]12        # fail if no ast parser in use13        if any(ast is None for ast in state_ast):14            raise TypeError(15                "Trying to use ast, but it is None. Are you using a parser? {} {}".format(16                    args, kwargs17                )18            )19        # check whether the parser passed or failed for some code20        # if safe_parsing is enabled in the Dispatcher (otherwise an exception would be raised earlier)21        ParseError = state.ast_dispatcher.ParseError22        parse_fail = any(isinstance(ast, ParseError) for ast in state_ast)23        if parse_fail:24            return state  # skip test25        else:26            return f(*args, **kwargs)  # proceed with test27    return wrapper28@requires_ast29def check_node(30    state, name, index=0, missing_msg=None, priority=None31):32    """Select a node from abstract syntax tree (AST), using its name and index position.33    Args:34        state: State instance describing student and solution code. Can be omitted if used with Ex().35        name : the name of the abstract syntax tree node to find.36        index: the position of that node (see below for details).37        missing_msg: feedback message if node is not in student AST.38        priority: the priority level of the node being searched for. This determines whether to39                  descend into other AST nodes during the search. Higher priority nodes descend40                  into lower priority. Currently, the only important part of priority is that41                  setting a very high priority (e.g. 99) will search every node.42    :Example:43        If both the student and solution code are.. ::44            SELECT a FROM b; SELECT x FROM y;45        then we can focus on the first select with::46            # approach 1: with manually created State instance47            state = State(*args, **kwargs)48            new_state = check_node(state, 'SelectStmt', 0)49            # approach 2:  with Ex and chaining50            new_state = Ex().check_node('SelectStmt', 0)51    """52    has_custom_message = bool(missing_msg)53    if missing_msg is None:54        missing_msg = DEFAULT_MISSING_MSG55    df = partial(state.ast_dispatcher.find, name, priority=priority)56    sol_stmt_list = df(state.solution_ast)57    try:58        sol_stmt = sol_stmt_list[index]59    except IndexError:60        raise IndexError("Can't get %s statement at index %s" % (name, index))61    stu_stmt_list = df(state.student_ast)62    try:63        stu_stmt = stu_stmt_list[index]64    except IndexError:65        # use speaker on ast dialect module to get message, or fall back to generic66        ast_path = state.get_ast_path() or "highlighted code"67        msg = state.ast_dispatcher.describe(68            sol_stmt, missing_msg, index=index, ast_path=ast_path69        )70        if msg is None:71            msg = MSG_CHECK_FALLBACK72        if has_custom_message:73            state.report(msg, append=False)74        state.report(msg)75    append_message = state.ast_dispatcher.describe(76        sol_stmt, DEFAULT_APPEND_MSG, index=index77    )78    return state.to_child(79        student_ast=stu_stmt, solution_ast=sol_stmt, append_message=append_message80    )81@requires_ast82def check_edge(state, name, index=0, missing_msg=None):83    """Select an attribute from an abstract syntax tree (AST) node, using the attribute name.84    Args:85        state: State instance describing student and solution code. Can be omitted if used with Ex().86        name: the name of the attribute to select from current AST node.87        index: entry to get from a list field. If too few entires, will fail with missing_msg.88        missing_msg: feedback message if attribute is not in student AST.89    :Example:90        If both the student and solution code are.. ::91            SELECT a FROM b; SELECT x FROM y;92        then we can get the from_clause using ::93            # approach 1: with manually created State instance -----94            state = State(*args, **kwargs)95            select = check_node(state, 'SelectStmt', 0)96            clause = check_edge(select, 'from_clause')97            # approach 2: with Ex and chaining ---------------------98            select = Ex().check_node('SelectStmt', 0)           # get first select statement99            clause =  select.check_edge('from_clause', None)    # get from_clause (a list)100            clause2 = select.check_edge('from_clause', 0)       # get first entry in from_clause101    """102    has_custom_message = bool(missing_msg)103    if missing_msg is None:104        missing_msg = DEFAULT_MISSING_MSG105    def select(node_name, node):106        attr = state.ast_dispatcher.select(node_name, node)107        if attr and isinstance(attr, list) and index is not None:108            attr = attr[index]109        return attr110    try:111        sol_attr = select(name, state.solution_ast)112    except IndexError:113        raise IndexError("Can't get %s attribute" % name)114    # use speaker on ast dialect module to get message, or fall back to generic115    ast_path = state.get_ast_path() or "highlighted code"116    _msg = state.ast_dispatcher.describe(117        state.student_ast, missing_msg, field=name, index=index, ast_path=ast_path118    )119    if _msg is None:120        _msg = MSG_CHECK_FALLBACK121    try:122        stu_attr = select(name, state.student_ast)123    except:124        if has_custom_message:125            state.report(_msg, append=False)126        state.report(_msg)127    # fail if attribute exists, but is none only for student128    if stu_attr is None and sol_attr is not None:129        if has_custom_message:130            state.report(_msg, append=False)131        state.report(_msg)132    append_message = state.ast_dispatcher.describe(133        state.student_ast, "Check the {field_name}. ", index=index, field=name134    )135    return state.to_child(136        student_ast=stu_attr, solution_ast=sol_attr, append_message=append_message137    )138def has_code(139    state,140    text,141    incorrect_msg="Check the {ast_path}. The checker expected to find {text}.",142    fixed=False,143):144    """Test whether the student code contains text.145    Args:146        state: State instance describing student and solution code. Can be omitted if used with Ex().147        text : text that student code must contain. Can be a regex pattern or a simple string.148        incorrect_msg: feedback message if text is not in student code.149        fixed: whether to match text exactly, rather than using regular expressions.150    Note:151        Functions like ``check_node`` focus on certain parts of code.152        Using these functions followed by ``has_code`` will only look153        in the code being focused on.154    :Example:155        If the student code is.. ::156            SELECT a FROM b WHERE id < 100157        Then the first test below would (unfortunately) pass, but the second would fail..::158            # contained in student code159            Ex().has_code(text="id < 10")160            # the $ means that you are matching the end of a line161            Ex().has_code(text="id < 10$")162        By setting ``fixed = True``, you can search for fixed strings::163            # without fixed = True, '*' matches any character164            Ex().has_code(text="SELECT * FROM b")               # passes165            Ex().has_code(text="SELECT \\\\* FROM b")             # fails166            Ex().has_code(text="SELECT * FROM b", fixed=True)   # fails167        You can check only the code corresponding to the WHERE clause, using ::168            where = Ex().check_node('SelectStmt', 0).check_edge('where_clause')169            where.has_code(text = "id < 10)170    """171    stu_ast = state.student_ast172    stu_code = state.student_code173    # fallback on using complete student code if no ast174    ParseError = state.ast_dispatcher.ParseError175    def get_text(ast, code):176        if isinstance(ast, ParseError):177            return code178        try:179            return ast.get_text(code) or ""180        except:181            return code182    stu_text = get_text(stu_ast, stu_code)183    _msg = incorrect_msg.format(184        ast_path=state.get_ast_path() or "highlighted code", text=text185    )186    # either simple text matching or regex test187    res = text in stu_text if fixed else re.search(text, stu_text)188    if not res:189        state.report(_msg)190    return state191@requires_ast192def has_equal_ast(193    state,194    incorrect_msg=None,195    sql=None,196    start=["expression", "subquery", "sql_script"][0],197    exact=None,198    should_append_msg=False,199):200    """Test whether the student and solution code have identical AST representations201    Args:202        state: State instance describing student and solution code. Can be omitted if used with Ex().203        incorrect_msg: feedback message if student and solution ASTs don't match204        sql  : optional code to use instead of the solution ast that is zoomed in on.205        start: if ``sql`` arg is used, the parser rule to parse the sql code.206               One of 'expression' (the default), 'subquery', or 'sql_script'.207        exact: whether to require an exact match (True), or only that the208               student AST contains the solution AST. If not specified, this209               defaults to ``True`` if ``sql`` is not specified, and to ``False``210               if ``sql`` is specified. You can always specify it manually.211        should_append_msg: prepend the auto generated incorrect_msg with the previous append_messages.212    :Example:213        Example 1 - Suppose the solution code is ::214            SELECT * FROM cities215        and you want to verify whether the `FROM` part is correct: ::216            Ex().check_node('SelectStmt').from_clause().has_equal_ast()217        Example 2 - Suppose the solution code is ::218            SELECT * FROM b WHERE id > 1 AND name = 'filip'219        Then the following SCT makes sure ``id > 1`` was used somewhere in the WHERE clause.::220            Ex().check_node('SelectStmt') \\/221                .check_edge('where_clause') \\/222                .has_equal_ast(sql = 'id > 1')223    """224    has_custom_message = bool(incorrect_msg)225    if not has_custom_message:226        if should_append_msg:  # Remove the ast_path mention because we are prepending.227            incorrect_msg = "{extra}"228        else:229            incorrect_msg = "Check the {ast_path}. {extra}"230    ast = state.ast_dispatcher.ast_mod231    sol_ast = state.solution_ast if sql is None else ast.parse(sql, start)232    # if sql is set, exact defaults to False.233    # if sql not set, exact defaults to True.234    if exact is None:235        exact = sql is None236    stu_rep = repr(state.student_ast)237    sol_rep = repr(sol_ast)238    def get_str(ast, code, sql):239        if sql:240            return sql241        if isinstance(ast, str):242            return ast243        try:244            return ast.get_text(code)245        except:246            return None247    sol_str = get_str(state.solution_ast, state.solution_code, sql)248    _msg = incorrect_msg.format(249        ast_path=state.get_ast_path()250        or ("code" if state.highlighting_disabled else "highlighted code"),251        extra="The checker expected to find `{}` in there.".format(sol_str)252        if sol_str253        else "Something is missing.",254    )255    if (exact and (sol_rep != stu_rep)) or (not exact and (sol_rep not in stu_rep)):256        if should_append_msg:257            state.report(_msg)258        state.report(_msg, append=False)259    return state260def has_parsed_ast(state):261    asts = [state.student_ast, state.solution_ast]262    if any(isinstance(c, state.ast_dispatcher.ParseError) for c in asts):263        state.report("AST did not parse")...

error.py

Source:error.py

...35        assert hasattr(self, 'exc_info')36        self.exc_info = None37        for frame in self.traceback.frames:38            frame.forget_python_frame()39    def has_custom_message(self):40        return self._has_custom_message41    def mark_as_failure(self):42        self._is_failure = True43    def is_fatal(self):44        return self._fatal45    @property46    @deprecated('Use error.exception_str', what='error.exception', since='1.2.3')47    def exception(self):48        return self.exception_str49    def mark_fatal(self):50        """Marks this error as fatal, causing session termination51        """52        self._fatal = True53        return self...

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