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