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1 | """ |
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1 | """ | |
2 | Module that re-groups transformer that would be applied to ipynb files |
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2 | Module that re-groups transformer that would be applied to ipynb files | |
3 | before going through the templating machinery. |
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3 | before going through the templating machinery. | |
4 |
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4 | |||
5 | It exposes a convenient class to inherit from to access configurability. |
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5 | It exposes a convenient class to inherit from to access configurability. | |
6 | """ |
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6 | """ | |
7 | #----------------------------------------------------------------------------- |
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7 | #----------------------------------------------------------------------------- | |
8 | # Copyright (c) 2013, the IPython Development Team. |
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8 | # Copyright (c) 2013, the IPython Development Team. | |
9 | # |
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9 | # | |
10 | # Distributed under the terms of the Modified BSD License. |
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10 | # Distributed under the terms of the Modified BSD License. | |
11 | # |
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11 | # | |
12 | # The full license is in the file COPYING.txt, distributed with this software. |
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12 | # The full license is in the file COPYING.txt, distributed with this software. | |
13 | #----------------------------------------------------------------------------- |
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13 | #----------------------------------------------------------------------------- | |
14 |
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14 | |||
15 | #----------------------------------------------------------------------------- |
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15 | #----------------------------------------------------------------------------- | |
16 | # Imports |
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16 | # Imports | |
17 | #----------------------------------------------------------------------------- |
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17 | #----------------------------------------------------------------------------- | |
18 |
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18 | |||
19 | from ..utils.base import NbConvertBase |
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19 | from ..utils.base import NbConvertBase | |
20 | from IPython.utils.traitlets import Bool |
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20 | from IPython.utils.traitlets import Bool | |
21 |
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21 | |||
22 | #----------------------------------------------------------------------------- |
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22 | #----------------------------------------------------------------------------- | |
23 | # Classes and Functions |
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23 | # Classes and Functions | |
24 | #----------------------------------------------------------------------------- |
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24 | #----------------------------------------------------------------------------- | |
25 |
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25 | |||
26 | class Transformer(NbConvertBase): |
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26 | class Transformer(NbConvertBase): | |
27 | """ A configurable transformer |
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27 | """ A configurable transformer | |
28 |
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28 | |||
29 | Inherit from this class if you wish to have configurability for your |
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29 | Inherit from this class if you wish to have configurability for your | |
30 | transformer. |
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30 | transformer. | |
31 |
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31 | |||
32 | Any configurable traitlets this class exposed will be configurable in profiles |
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32 | Any configurable traitlets this class exposed will be configurable in profiles | |
33 | using c.SubClassName.atribute=value |
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33 | using c.SubClassName.atribute=value | |
34 |
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34 | |||
35 | you can overwrite `transform_cell` to apply a transformation independently on each cell |
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35 | you can overwrite :meth:`transform_cell` to apply a transformation independently on each cell | |
36 | or `call` if you prefer your own logic. See corresponding docstring for informations. |
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36 | or :meth:`call` if you prefer your own logic. See corresponding docstring for informations. | |
37 |
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37 | |||
38 | Disabled by default and can be enabled via the config by |
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38 | Disabled by default and can be enabled via the config by | |
39 | 'c.YourTransformerName.enabled = True' |
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39 | 'c.YourTransformerName.enabled = True' | |
40 | """ |
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40 | """ | |
41 |
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41 | |||
42 | enabled = Bool(False, config=True) |
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42 | enabled = Bool(False, config=True) | |
43 |
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43 | |||
44 | def __init__(self, **kw): |
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44 | def __init__(self, **kw): | |
45 | """ |
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45 | """ | |
46 | Public constructor |
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46 | Public constructor | |
47 |
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47 | |||
48 | Parameters |
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48 | Parameters | |
49 | ---------- |
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49 | ---------- | |
50 | config : Config |
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50 | config : Config | |
51 | Configuration file structure |
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51 | Configuration file structure | |
52 | **kw : misc |
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52 | **kw : misc | |
53 | Additional arguments |
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53 | Additional arguments | |
54 | """ |
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54 | """ | |
55 |
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55 | |||
56 | super(Transformer, self).__init__(**kw) |
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56 | super(Transformer, self).__init__(**kw) | |
57 |
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57 | |||
58 |
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58 | |||
59 | def __call__(self, nb, resources): |
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59 | def __call__(self, nb, resources): | |
60 | if self.enabled: |
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60 | if self.enabled: | |
61 | return self.call(nb,resources) |
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61 | return self.call(nb,resources) | |
62 | else: |
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62 | else: | |
63 | return nb, resources |
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63 | return nb, resources | |
64 |
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64 | |||
65 |
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65 | |||
66 | def call(self, nb, resources): |
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66 | def call(self, nb, resources): | |
67 | """ |
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67 | """ | |
68 | Transformation to apply on each notebook. |
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68 | Transformation to apply on each notebook. | |
69 |
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69 | |||
70 | You should return modified nb, resources. |
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70 | You should return modified nb, resources. | |
71 | If you wish to apply your transform on each cell, you might want to |
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71 | If you wish to apply your transform on each cell, you might want to | |
72 | overwrite transform_cell method instead. |
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72 | overwrite transform_cell method instead. | |
73 |
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73 | |||
74 | Parameters |
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74 | Parameters | |
75 | ---------- |
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75 | ---------- | |
76 | nb : NotebookNode |
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76 | nb : NotebookNode | |
77 | Notebook being converted |
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77 | Notebook being converted | |
78 | resources : dictionary |
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78 | resources : dictionary | |
79 | Additional resources used in the conversion process. Allows |
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79 | Additional resources used in the conversion process. Allows | |
80 | transformers to pass variables into the Jinja engine. |
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80 | transformers to pass variables into the Jinja engine. | |
81 | """ |
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81 | """ | |
82 | self.log.debug("Applying transform: %s", self.__class__.__name__) |
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82 | self.log.debug("Applying transform: %s", self.__class__.__name__) | |
83 | try : |
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83 | try : | |
84 | for worksheet in nb.worksheets: |
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84 | for worksheet in nb.worksheets: | |
85 | for index, cell in enumerate(worksheet.cells): |
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85 | for index, cell in enumerate(worksheet.cells): | |
86 | worksheet.cells[index], resources = self.transform_cell(cell, resources, index) |
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86 | worksheet.cells[index], resources = self.transform_cell(cell, resources, index) | |
87 | return nb, resources |
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87 | return nb, resources | |
88 | except NotImplementedError: |
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88 | except NotImplementedError: | |
89 | raise NotImplementedError('should be implemented by subclass') |
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89 | raise NotImplementedError('should be implemented by subclass') | |
90 |
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90 | |||
91 |
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91 | |||
92 | def transform_cell(self, cell, resources, index): |
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92 | def transform_cell(self, cell, resources, index): | |
93 | """ |
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93 | """ | |
94 | Overwrite if you want to apply a transformation on each cell. You |
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94 | Overwrite if you want to apply a transformation on each cell. You | |
95 | should return modified cell and resource dictionary. |
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95 | should return modified cell and resource dictionary. | |
96 |
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96 | |||
97 | Parameters |
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97 | Parameters | |
98 | ---------- |
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98 | ---------- | |
99 | cell : NotebookNode cell |
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99 | cell : NotebookNode cell | |
100 | Notebook cell being processed |
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100 | Notebook cell being processed | |
101 | resources : dictionary |
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101 | resources : dictionary | |
102 | Additional resources used in the conversion process. Allows |
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102 | Additional resources used in the conversion process. Allows | |
103 | transformers to pass variables into the Jinja engine. |
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103 | transformers to pass variables into the Jinja engine. | |
104 | index : int |
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104 | index : int | |
105 | Index of the cell being processed |
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105 | Index of the cell being processed | |
106 | """ |
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106 | """ | |
107 |
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107 | |||
108 | raise NotImplementedError('should be implemented by subclass') |
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108 | raise NotImplementedError('should be implemented by subclass') | |
109 | return cell, resources |
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109 | return cell, resources | |
110 |
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110 |
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