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1 | """Latex transformer. |
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1 | """Latex transformer. | |
2 |
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2 | |||
3 | Module that allows latex output notebooks to be conditioned before |
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3 | Module that allows latex output notebooks to be conditioned before | |
4 | they are converted. |
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4 | they are converted. | |
5 | """ |
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5 | """ | |
6 | #----------------------------------------------------------------------------- |
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6 | #----------------------------------------------------------------------------- | |
7 | # Copyright (c) 2013, the IPython Development Team. |
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7 | # Copyright (c) 2013, the IPython Development Team. | |
8 | # |
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8 | # | |
9 | # Distributed under the terms of the Modified BSD License. |
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9 | # Distributed under the terms of the Modified BSD License. | |
10 | # |
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10 | # | |
11 | # The full license is in the file COPYING.txt, distributed with this software. |
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11 | # The full license is in the file COPYING.txt, distributed with this software. | |
12 | #----------------------------------------------------------------------------- |
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12 | #----------------------------------------------------------------------------- | |
13 |
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13 | |||
14 | #----------------------------------------------------------------------------- |
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14 | #----------------------------------------------------------------------------- | |
15 | # Imports |
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15 | # Imports | |
16 | #----------------------------------------------------------------------------- |
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16 | #----------------------------------------------------------------------------- | |
17 | from __future__ import print_function, absolute_import |
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17 | from __future__ import print_function, absolute_import | |
18 |
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18 | |||
19 | # Our own imports |
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19 | # Our own imports | |
20 | # Needed to override transformer |
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20 | # Needed to override transformer | |
21 | from .transformers import (ActivatableTransformer) #TODO |
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21 | from .transformers import (ActivatableTransformer) #TODO | |
22 |
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22 | |||
23 | #----------------------------------------------------------------------------- |
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23 | #----------------------------------------------------------------------------- | |
24 | # Classes |
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24 | # Classes | |
25 | #----------------------------------------------------------------------------- |
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25 | #----------------------------------------------------------------------------- | |
26 | class LatexTransformer(ActivatableTransformer): |
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26 | class LatexTransformer(ActivatableTransformer): | |
27 | """ |
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27 | """ | |
28 | Converter for latex destined documents. |
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28 | Converter for latex destined documents. | |
29 | """ |
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29 | """ | |
30 |
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30 | |||
31 | def cell_transform(self, cell, other, index): |
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31 | def cell_transform(self, cell, other, index): | |
32 | """ |
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32 | """ | |
33 | Apply a transformation on each cell, |
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33 | Apply a transformation on each cell, | |
34 |
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34 | |||
35 | receive the current cell, the resource dict and the index of current cell as parameter. |
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35 | receive the current cell, the resource dict and the index of current cell as parameter. | |
36 |
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36 | |||
37 | Returns modified cell and resource dict. |
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37 | Returns modified cell and resource dict. | |
38 | """ |
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38 | """ | |
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39 | ||||
39 | if hasattr(cell, "source") and cell.cell_type == "markdown": |
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40 | if hasattr(cell, "source") and cell.cell_type == "markdown": | |
40 | cell.source = rm_math_space(cell.source) |
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41 | cell.source = rm_math_space(cell.source) | |
41 | return cell, other |
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42 | return cell, other | |
42 |
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43 | |||
43 | #----------------------------------------------------------------------------- |
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44 | #----------------------------------------------------------------------------- | |
44 | # Functions |
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45 | # Functions | |
45 | #----------------------------------------------------------------------------- |
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46 | #----------------------------------------------------------------------------- | |
46 | def rm_math_space(text): |
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47 | def rm_math_space(text): | |
47 | """ |
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48 | """ | |
48 | Remove the space between latex math commands and enclosing $ symbols. |
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49 | Remove the space between latex math commands and enclosing $ symbols. | |
49 | """ |
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50 | """ | |
50 |
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51 | |||
51 | # First, scan through the markdown looking for $. If |
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52 | # First, scan through the markdown looking for $. If | |
52 | # a $ symbol is found, without a preceding \, assume |
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53 | # a $ symbol is found, without a preceding \, assume | |
53 | # it is the start of a math block. UNLESS that $ is |
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54 | # it is the start of a math block. UNLESS that $ is | |
54 | # not followed by another within two math_lines. |
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55 | # not followed by another within two math_lines. | |
55 | math_regions = [] |
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56 | math_regions = [] | |
56 | math_lines = 0 |
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57 | math_lines = 0 | |
57 | within_math = False |
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58 | within_math = False | |
58 | math_start_index = 0 |
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59 | math_start_index = 0 | |
59 | ptext = '' |
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60 | ptext = '' | |
60 | last_character = "" |
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61 | last_character = "" | |
61 | skip = False |
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62 | skip = False | |
62 | for index, char in enumerate(text): |
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63 | for index, char in enumerate(text): | |
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64 | ||||
63 | #Make sure the character isn't preceeded by a backslash |
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65 | #Make sure the character isn't preceeded by a backslash | |
64 | if (char == "$" and last_character != "\\"): |
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66 | if (char == "$" and last_character != "\\"): | |
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67 | ||||
65 | # Close the math region if this is an ending $ |
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68 | # Close the math region if this is an ending $ | |
66 | if within_math: |
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69 | if within_math: | |
67 | within_math = False |
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70 | within_math = False | |
68 | skip = True |
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71 | skip = True | |
69 | ptext = ptext+'$'+text[math_start_index+1:index].strip()+'$' |
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72 | ptext = ptext+'$'+text[math_start_index+1:index].strip()+'$' | |
70 | math_regions.append([math_start_index, index+1]) |
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73 | math_regions.append([math_start_index, index+1]) | |
71 | else: |
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74 | else: | |
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75 | ||||
72 | # Start a new math region |
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76 | # Start a new math region | |
73 | within_math = True |
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77 | within_math = True | |
74 | math_start_index = index |
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78 | math_start_index = index | |
75 | math_lines = 0 |
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79 | math_lines = 0 | |
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80 | ||||
76 | # If we are in a math region, count the number of lines parsed. |
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81 | # If we are in a math region, count the number of lines parsed. | |
77 | # Cancel the math region if we find two line breaks! |
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82 | # Cancel the math region if we find two line breaks! | |
78 | elif char == "\n": |
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83 | elif char == "\n": | |
79 | if within_math: |
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84 | if within_math: | |
80 | math_lines += 1 |
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85 | math_lines += 1 | |
81 | if math_lines > 1: |
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86 | if math_lines > 1: | |
82 | within_math = False |
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87 | within_math = False | |
83 | ptext = ptext+text[math_start_index:index] |
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88 | ptext = ptext+text[math_start_index:index] | |
84 |
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89 | |||
85 | # Remember the last character so we can easily watch |
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90 | # Remember the last character so we can easily watch | |
86 | # for backslashes |
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91 | # for backslashes | |
87 | last_character = char |
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92 | last_character = char | |
88 | if not within_math and not skip: |
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93 | if not within_math and not skip: | |
89 | ptext = ptext+char |
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94 | ptext = ptext+char | |
90 | if skip: |
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95 | if skip: | |
91 | skip = False |
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96 | skip = False | |
92 | return ptext |
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97 | return ptext |
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