|
| 1 | +import contextlib |
| 2 | +import io |
| 3 | +import re |
| 4 | + |
| 5 | +from IPython.core.magic import register_cell_magic |
| 6 | +from IPython.core.magic_arguments import argument, magic_arguments, parse_argstring |
| 7 | + |
| 8 | + |
| 9 | +def traceback(mode): |
| 10 | + """ |
| 11 | + """ |
| 12 | + with contextlib.redirect_stdout(io.StringIO()): |
| 13 | + get_ipython().run_cell(f'%xmode {mode}') |
| 14 | + |
| 15 | + |
| 16 | +def extract_function_name(text): |
| 17 | + """Find a function definition and return its name. |
| 18 | +
|
| 19 | + text: String |
| 20 | +
|
| 21 | + returns: String or None |
| 22 | + """ |
| 23 | + pattern = r"def\s+(\w+)\s*\(" |
| 24 | + match = re.search(pattern, text) |
| 25 | + if match: |
| 26 | + func_name = match.group(1) |
| 27 | + return func_name |
| 28 | + else: |
| 29 | + return None |
| 30 | + |
| 31 | + |
| 32 | +@register_cell_magic |
| 33 | +def add_method_to(args, cell): |
| 34 | + |
| 35 | + # get the name of the function defined in this cell |
| 36 | + func_name = extract_function_name(cell) |
| 37 | + if func_name is None: |
| 38 | + return f"This cell doesn't define any new functions." |
| 39 | + |
| 40 | + # get the class we're adding it to |
| 41 | + namespace = get_ipython().user_ns |
| 42 | + class_name = args |
| 43 | + cls = namespace.get(class_name, None) |
| 44 | + if cls is None: |
| 45 | + return f"Class '{class_name}' not found." |
| 46 | + |
| 47 | + # save the old version of the function if it was already defined |
| 48 | + old_func = namespace.get(func_name, None) |
| 49 | + if old_func is not None: |
| 50 | + del namespace[func_name] |
| 51 | + |
| 52 | + # Execute the cell to define the function |
| 53 | + get_ipython().run_cell(cell) |
| 54 | + |
| 55 | + # get the newly defined function |
| 56 | + new_func = namespace.get(func_name, None) |
| 57 | + if new_func is None: |
| 58 | + return f"This cell didn't define {func_name}." |
| 59 | + |
| 60 | + # add the function to the class and remove it from the namespace |
| 61 | + setattr(cls, func_name, new_func) |
| 62 | + del namespace[func_name] |
| 63 | + |
| 64 | + # restore the old function to the namespace |
| 65 | + if old_func is not None: |
| 66 | + namespace[func_name] = old_func |
| 67 | + |
| 68 | + |
| 69 | +@register_cell_magic |
| 70 | +def expect_error(line, cell): |
| 71 | + try: |
| 72 | + get_ipython().run_cell(cell) |
| 73 | + except Exception as e: |
| 74 | + get_ipython().run_cell('%tb') |
| 75 | + |
| 76 | + |
| 77 | + |
| 78 | +@magic_arguments() |
| 79 | +@argument('exception', help='Type of exception to catch') |
| 80 | +@register_cell_magic |
| 81 | +def expect(line, cell): |
| 82 | + args = parse_argstring(expect, line) |
| 83 | + exception = eval(args.exception) |
| 84 | + try: |
| 85 | + get_ipython().run_cell(cell) |
| 86 | + except exception as e: |
| 87 | + get_ipython().run_cell("%tb") |
| 88 | + |
| 89 | + |
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