[3] | 1 | # Authors: David Goodger, Ueli Schlaepfer |
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| 2 | # Contact: goodger@users.sourceforge.net |
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| 3 | # Revision: $Revision: 4242 $ |
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| 4 | # Date: $Date: 2006-01-06 00:28:53 +0100 (Fri, 06 Jan 2006) $ |
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| 5 | # Copyright: This module has been placed in the public domain. |
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| 6 | |
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| 7 | """ |
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| 8 | Transforms related to the front matter of a document or a section |
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| 9 | (information found before the main text): |
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| 10 | |
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| 11 | - `DocTitle`: Used to transform a lone top level section's title to |
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| 12 | the document title, promote a remaining lone top-level section's |
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| 13 | title to the document subtitle, and determine the document's title |
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| 14 | metadata (document['title']) based on the document title and/or the |
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| 15 | "title" setting. |
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| 16 | |
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| 17 | - `SectionSubTitle`: Used to transform a lone subsection into a |
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| 18 | subtitle. |
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| 19 | |
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| 20 | - `DocInfo`: Used to transform a bibliographic field list into docinfo |
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| 21 | elements. |
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| 22 | """ |
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| 23 | |
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| 24 | __docformat__ = 'reStructuredText' |
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| 25 | |
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| 26 | import re |
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| 27 | from docutils import nodes, utils |
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| 28 | from docutils.transforms import TransformError, Transform |
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| 29 | |
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| 30 | |
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| 31 | class TitlePromoter(Transform): |
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| 32 | |
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| 33 | """ |
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| 34 | Abstract base class for DocTitle and SectionSubTitle transforms. |
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| 35 | """ |
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| 36 | |
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| 37 | def promote_title(self, node): |
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| 38 | """ |
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| 39 | Transform the following tree:: |
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| 40 | |
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| 41 | <node> |
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| 42 | <section> |
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| 43 | <title> |
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| 44 | ... |
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| 45 | |
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| 46 | into :: |
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| 47 | |
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| 48 | <node> |
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| 49 | <title> |
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| 50 | ... |
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| 51 | |
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| 52 | `node` is normally a document. |
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| 53 | """ |
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| 54 | # `node` must not have a title yet. |
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| 55 | assert not (len(node) and isinstance(node[0], nodes.title)) |
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| 56 | section, index = self.candidate_index(node) |
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| 57 | if index is None: |
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| 58 | return None |
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| 59 | # Transfer the section's attributes to the node: |
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| 60 | node.attributes.update(section.attributes) |
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| 61 | # setup_child is called automatically for all nodes. |
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| 62 | node[:] = (section[:1] # section title |
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| 63 | + node[:index] # everything that was in the |
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| 64 | # node before the section |
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| 65 | + section[1:]) # everything that was in the section |
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| 66 | assert isinstance(node[0], nodes.title) |
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| 67 | return 1 |
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| 68 | |
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| 69 | def promote_subtitle(self, node): |
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| 70 | """ |
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| 71 | Transform the following node tree:: |
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| 72 | |
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| 73 | <node> |
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| 74 | <title> |
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| 75 | <section> |
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| 76 | <title> |
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| 77 | ... |
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| 78 | |
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| 79 | into :: |
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| 80 | |
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| 81 | <node> |
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| 82 | <title> |
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| 83 | <subtitle> |
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| 84 | ... |
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| 85 | """ |
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| 86 | subsection, index = self.candidate_index(node) |
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| 87 | if index is None: |
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| 88 | return None |
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| 89 | subtitle = nodes.subtitle() |
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| 90 | # Transfer the subsection's attributes to the new subtitle: |
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| 91 | # This causes trouble with list attributes! To do: Write a |
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| 92 | # test case which catches direct access to the `attributes` |
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| 93 | # dictionary and/or write a test case which shows problems in |
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| 94 | # this particular case. |
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| 95 | subtitle.attributes.update(subsection.attributes) |
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| 96 | # We're losing the subtitle's attributes here! To do: Write a |
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| 97 | # test case which shows this behavior. |
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| 98 | # Transfer the contents of the subsection's title to the |
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| 99 | # subtitle: |
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| 100 | subtitle[:] = subsection[0][:] |
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| 101 | node[:] = (node[:1] # title |
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| 102 | + [subtitle] |
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| 103 | # everything that was before the section: |
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| 104 | + node[1:index] |
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| 105 | # everything that was in the subsection: |
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| 106 | + subsection[1:]) |
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| 107 | return 1 |
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| 108 | |
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| 109 | def candidate_index(self, node): |
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| 110 | """ |
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| 111 | Find and return the promotion candidate and its index. |
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| 112 | |
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| 113 | Return (None, None) if no valid candidate was found. |
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| 114 | """ |
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| 115 | index = node.first_child_not_matching_class( |
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| 116 | nodes.PreBibliographic) |
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| 117 | if index is None or len(node) > (index + 1) or \ |
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| 118 | not isinstance(node[index], nodes.section): |
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| 119 | return None, None |
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| 120 | else: |
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| 121 | return node[index], index |
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| 122 | |
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| 123 | |
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| 124 | class DocTitle(TitlePromoter): |
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| 125 | |
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| 126 | """ |
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| 127 | In reStructuredText_, there is no way to specify a document title |
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| 128 | and subtitle explicitly. Instead, we can supply the document title |
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| 129 | (and possibly the subtitle as well) implicitly, and use this |
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| 130 | two-step transform to "raise" or "promote" the title(s) (and their |
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| 131 | corresponding section contents) to the document level. |
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| 132 | |
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| 133 | 1. If the document contains a single top-level section as its |
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| 134 | first non-comment element, the top-level section's title |
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| 135 | becomes the document's title, and the top-level section's |
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| 136 | contents become the document's immediate contents. The lone |
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| 137 | top-level section header must be the first non-comment element |
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| 138 | in the document. |
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| 139 | |
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| 140 | For example, take this input text:: |
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| 141 | |
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| 142 | ================= |
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| 143 | Top-Level Title |
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| 144 | ================= |
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| 145 | |
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| 146 | A paragraph. |
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| 147 | |
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| 148 | Once parsed, it looks like this:: |
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| 149 | |
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| 150 | <document> |
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| 151 | <section names="top-level title"> |
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| 152 | <title> |
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| 153 | Top-Level Title |
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| 154 | <paragraph> |
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| 155 | A paragraph. |
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| 156 | |
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| 157 | After running the DocTitle transform, we have:: |
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| 158 | |
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| 159 | <document names="top-level title"> |
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| 160 | <title> |
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| 161 | Top-Level Title |
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| 162 | <paragraph> |
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| 163 | A paragraph. |
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| 164 | |
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| 165 | 2. If step 1 successfully determines the document title, we |
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| 166 | continue by checking for a subtitle. |
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| 167 | |
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| 168 | If the lone top-level section itself contains a single |
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| 169 | second-level section as its first non-comment element, that |
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| 170 | section's title is promoted to the document's subtitle, and |
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| 171 | that section's contents become the document's immediate |
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| 172 | contents. Given this input text:: |
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| 173 | |
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| 174 | ================= |
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| 175 | Top-Level Title |
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| 176 | ================= |
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| 177 | |
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| 178 | Second-Level Title |
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| 179 | ~~~~~~~~~~~~~~~~~~ |
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| 180 | |
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| 181 | A paragraph. |
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| 182 | |
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| 183 | After parsing and running the Section Promotion transform, the |
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| 184 | result is:: |
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| 185 | |
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| 186 | <document names="top-level title"> |
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| 187 | <title> |
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| 188 | Top-Level Title |
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| 189 | <subtitle names="second-level title"> |
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| 190 | Second-Level Title |
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| 191 | <paragraph> |
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| 192 | A paragraph. |
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| 193 | |
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| 194 | (Note that the implicit hyperlink target generated by the |
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| 195 | "Second-Level Title" is preserved on the "subtitle" element |
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| 196 | itself.) |
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| 197 | |
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| 198 | Any comment elements occurring before the document title or |
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| 199 | subtitle are accumulated and inserted as the first body elements |
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| 200 | after the title(s). |
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| 201 | |
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| 202 | This transform also sets the document's metadata title |
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| 203 | (document['title']). |
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| 204 | |
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| 205 | .. _reStructuredText: http://docutils.sf.net/rst.html |
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| 206 | """ |
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| 207 | |
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| 208 | default_priority = 320 |
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| 209 | |
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| 210 | def set_metadata(self): |
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| 211 | """ |
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| 212 | Set document['title'] metadata title from the following |
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| 213 | sources, listed in order of priority: |
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| 214 | |
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| 215 | * Existing document['title'] attribute. |
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| 216 | * "title" setting. |
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| 217 | * Document title node (as promoted by promote_title). |
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| 218 | """ |
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| 219 | if not self.document.hasattr('title'): |
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| 220 | if self.document.settings.title is not None: |
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| 221 | self.document['title'] = self.document.settings.title |
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| 222 | elif len(self.document) and isinstance(self.document[0], nodes.title): |
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| 223 | self.document['title'] = self.document[0].astext() |
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| 224 | |
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| 225 | def apply(self): |
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| 226 | if getattr(self.document.settings, 'doctitle_xform', 1): |
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| 227 | # promote_(sub)title defined in TitlePromoter base class. |
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| 228 | if self.promote_title(self.document): |
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| 229 | # If a title has been promoted, also try to promote a |
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| 230 | # subtitle. |
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| 231 | self.promote_subtitle(self.document) |
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| 232 | # Set document['title']. |
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| 233 | self.set_metadata() |
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| 234 | |
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| 235 | |
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| 236 | class SectionSubTitle(TitlePromoter): |
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| 237 | |
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| 238 | """ |
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| 239 | This works like document subtitles, but for sections. For example, :: |
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| 240 | |
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| 241 | <section> |
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| 242 | <title> |
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| 243 | Title |
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| 244 | <section> |
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| 245 | <title> |
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| 246 | Subtitle |
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| 247 | ... |
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| 248 | |
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| 249 | is transformed into :: |
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| 250 | |
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| 251 | <section> |
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| 252 | <title> |
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| 253 | Title |
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| 254 | <subtitle> |
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| 255 | Subtitle |
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| 256 | ... |
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| 257 | |
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| 258 | For details refer to the docstring of DocTitle. |
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| 259 | """ |
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| 260 | |
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| 261 | default_priority = 350 |
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| 262 | |
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| 263 | def apply(self): |
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| 264 | if not getattr(self.document.settings, 'sectsubtitle_xform', 1): |
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| 265 | return |
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| 266 | for section in self.document.traverse(nodes.section): |
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| 267 | # On our way through the node tree, we are deleting |
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| 268 | # sections, but we call self.promote_subtitle for those |
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| 269 | # sections nonetheless. To do: Write a test case which |
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| 270 | # shows the problem and discuss on Docutils-develop. |
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| 271 | self.promote_subtitle(section) |
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| 272 | |
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| 273 | |
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| 274 | class DocInfo(Transform): |
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| 275 | |
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| 276 | """ |
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| 277 | This transform is specific to the reStructuredText_ markup syntax; |
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| 278 | see "Bibliographic Fields" in the `reStructuredText Markup |
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| 279 | Specification`_ for a high-level description. This transform |
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| 280 | should be run *after* the `DocTitle` transform. |
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| 281 | |
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| 282 | Given a field list as the first non-comment element after the |
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| 283 | document title and subtitle (if present), registered bibliographic |
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| 284 | field names are transformed to the corresponding DTD elements, |
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| 285 | becoming child elements of the "docinfo" element (except for a |
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| 286 | dedication and/or an abstract, which become "topic" elements after |
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| 287 | "docinfo"). |
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| 288 | |
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| 289 | For example, given this document fragment after parsing:: |
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| 290 | |
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| 291 | <document> |
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| 292 | <title> |
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| 293 | Document Title |
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| 294 | <field_list> |
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| 295 | <field> |
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| 296 | <field_name> |
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| 297 | Author |
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| 298 | <field_body> |
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| 299 | <paragraph> |
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| 300 | A. Name |
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| 301 | <field> |
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| 302 | <field_name> |
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| 303 | Status |
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| 304 | <field_body> |
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| 305 | <paragraph> |
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| 306 | $RCSfile$ |
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| 307 | ... |
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| 308 | |
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| 309 | After running the bibliographic field list transform, the |
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| 310 | resulting document tree would look like this:: |
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| 311 | |
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| 312 | <document> |
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| 313 | <title> |
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| 314 | Document Title |
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| 315 | <docinfo> |
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| 316 | <author> |
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| 317 | A. Name |
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| 318 | <status> |
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| 319 | frontmatter.py |
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| 320 | ... |
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| 321 | |
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| 322 | The "Status" field contained an expanded RCS keyword, which is |
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| 323 | normally (but optionally) cleaned up by the transform. The sole |
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| 324 | contents of the field body must be a paragraph containing an |
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| 325 | expanded RCS keyword of the form "$keyword: expansion text $". Any |
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| 326 | RCS keyword can be processed in any bibliographic field. The |
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| 327 | dollar signs and leading RCS keyword name are removed. Extra |
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| 328 | processing is done for the following RCS keywords: |
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| 329 | |
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| 330 | - "RCSfile" expands to the name of the file in the RCS or CVS |
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| 331 | repository, which is the name of the source file with a ",v" |
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| 332 | suffix appended. The transform will remove the ",v" suffix. |
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| 333 | |
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| 334 | - "Date" expands to the format "YYYY/MM/DD hh:mm:ss" (in the UTC |
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| 335 | time zone). The RCS Keywords transform will extract just the |
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| 336 | date itself and transform it to an ISO 8601 format date, as in |
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| 337 | "2000-12-31". |
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| 338 | |
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| 339 | (Since the source file for this text is itself stored under CVS, |
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| 340 | we can't show an example of the "Date" RCS keyword because we |
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| 341 | can't prevent any RCS keywords used in this explanation from |
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| 342 | being expanded. Only the "RCSfile" keyword is stable; its |
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| 343 | expansion text changes only if the file name changes.) |
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| 344 | |
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| 345 | .. _reStructuredText: http://docutils.sf.net/rst.html |
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| 346 | .. _reStructuredText Markup Specification: |
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| 347 | http://docutils.sf.net/docs/ref/rst/restructuredtext.html |
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| 348 | """ |
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| 349 | |
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| 350 | default_priority = 340 |
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| 351 | |
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| 352 | biblio_nodes = { |
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| 353 | 'author': nodes.author, |
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| 354 | 'authors': nodes.authors, |
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| 355 | 'organization': nodes.organization, |
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| 356 | 'address': nodes.address, |
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| 357 | 'contact': nodes.contact, |
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| 358 | 'version': nodes.version, |
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| 359 | 'revision': nodes.revision, |
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| 360 | 'status': nodes.status, |
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| 361 | 'date': nodes.date, |
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| 362 | 'copyright': nodes.copyright, |
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| 363 | 'dedication': nodes.topic, |
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| 364 | 'abstract': nodes.topic} |
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| 365 | """Canonical field name (lowcased) to node class name mapping for |
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| 366 | bibliographic fields (field_list).""" |
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| 367 | |
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| 368 | def apply(self): |
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| 369 | if not getattr(self.document.settings, 'docinfo_xform', 1): |
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| 370 | return |
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| 371 | document = self.document |
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| 372 | index = document.first_child_not_matching_class( |
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| 373 | nodes.PreBibliographic) |
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| 374 | if index is None: |
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| 375 | return |
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| 376 | candidate = document[index] |
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| 377 | if isinstance(candidate, nodes.field_list): |
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| 378 | biblioindex = document.first_child_not_matching_class( |
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| 379 | (nodes.Titular, nodes.Decorative)) |
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| 380 | nodelist = self.extract_bibliographic(candidate) |
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| 381 | del document[index] # untransformed field list (candidate) |
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| 382 | document[biblioindex:biblioindex] = nodelist |
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| 383 | |
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| 384 | def extract_bibliographic(self, field_list): |
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| 385 | docinfo = nodes.docinfo() |
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| 386 | bibliofields = self.language.bibliographic_fields |
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| 387 | labels = self.language.labels |
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| 388 | topics = {'dedication': None, 'abstract': None} |
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| 389 | for field in field_list: |
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| 390 | try: |
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| 391 | name = field[0][0].astext() |
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| 392 | normedname = nodes.fully_normalize_name(name) |
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| 393 | if not (len(field) == 2 and bibliofields.has_key(normedname) |
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| 394 | and self.check_empty_biblio_field(field, name)): |
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| 395 | raise TransformError |
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| 396 | canonical = bibliofields[normedname] |
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| 397 | biblioclass = self.biblio_nodes[canonical] |
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| 398 | if issubclass(biblioclass, nodes.TextElement): |
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| 399 | if not self.check_compound_biblio_field(field, name): |
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| 400 | raise TransformError |
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| 401 | utils.clean_rcs_keywords( |
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| 402 | field[1][0], self.rcs_keyword_substitutions) |
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| 403 | docinfo.append(biblioclass('', '', *field[1][0])) |
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| 404 | elif issubclass(biblioclass, nodes.authors): |
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| 405 | self.extract_authors(field, name, docinfo) |
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| 406 | elif issubclass(biblioclass, nodes.topic): |
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| 407 | if topics[canonical]: |
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| 408 | field[-1] += self.document.reporter.warning( |
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| 409 | 'There can only be one "%s" field.' % name, |
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| 410 | base_node=field) |
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| 411 | raise TransformError |
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| 412 | title = nodes.title(name, labels[canonical]) |
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| 413 | topics[canonical] = biblioclass( |
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| 414 | '', title, classes=[canonical], *field[1].children) |
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| 415 | else: |
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| 416 | docinfo.append(biblioclass('', *field[1].children)) |
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| 417 | except TransformError: |
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| 418 | if len(field[-1]) == 1 \ |
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| 419 | and isinstance(field[-1][0], nodes.paragraph): |
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| 420 | utils.clean_rcs_keywords( |
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| 421 | field[-1][0], self.rcs_keyword_substitutions) |
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| 422 | docinfo.append(field) |
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| 423 | nodelist = [] |
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| 424 | if len(docinfo) != 0: |
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| 425 | nodelist.append(docinfo) |
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| 426 | for name in ('dedication', 'abstract'): |
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| 427 | if topics[name]: |
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| 428 | nodelist.append(topics[name]) |
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| 429 | return nodelist |
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| 430 | |
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| 431 | def check_empty_biblio_field(self, field, name): |
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| 432 | if len(field[-1]) < 1: |
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| 433 | field[-1] += self.document.reporter.warning( |
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| 434 | 'Cannot extract empty bibliographic field "%s".' % name, |
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| 435 | base_node=field) |
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| 436 | return None |
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| 437 | return 1 |
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| 438 | |
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| 439 | def check_compound_biblio_field(self, field, name): |
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| 440 | if len(field[-1]) > 1: |
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| 441 | field[-1] += self.document.reporter.warning( |
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| 442 | 'Cannot extract compound bibliographic field "%s".' % name, |
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| 443 | base_node=field) |
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| 444 | return None |
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| 445 | if not isinstance(field[-1][0], nodes.paragraph): |
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| 446 | field[-1] += self.document.reporter.warning( |
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| 447 | 'Cannot extract bibliographic field "%s" containing ' |
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| 448 | 'anything other than a single paragraph.' % name, |
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| 449 | base_node=field) |
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| 450 | return None |
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| 451 | return 1 |
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| 452 | |
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| 453 | rcs_keyword_substitutions = [ |
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| 454 | (re.compile(r'\$' r'Date: (\d\d\d\d)[-/](\d\d)[-/](\d\d)[ T][\d:]+' |
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| 455 | r'[^$]* \$', re.IGNORECASE), r'\1-\2-\3'), |
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| 456 | (re.compile(r'\$' r'RCSfile: (.+),v \$', re.IGNORECASE), r'\1'), |
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| 457 | (re.compile(r'\$[a-zA-Z]+: (.+) \$'), r'\1'),] |
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| 458 | |
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| 459 | def extract_authors(self, field, name, docinfo): |
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| 460 | try: |
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| 461 | if len(field[1]) == 1: |
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| 462 | if isinstance(field[1][0], nodes.paragraph): |
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| 463 | authors = self.authors_from_one_paragraph(field) |
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| 464 | elif isinstance(field[1][0], nodes.bullet_list): |
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| 465 | authors = self.authors_from_bullet_list(field) |
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| 466 | else: |
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| 467 | raise TransformError |
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| 468 | else: |
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| 469 | authors = self.authors_from_paragraphs(field) |
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| 470 | authornodes = [nodes.author('', '', *author) |
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| 471 | for author in authors if author] |
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| 472 | if len(authornodes) >= 1: |
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| 473 | docinfo.append(nodes.authors('', *authornodes)) |
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| 474 | else: |
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| 475 | raise TransformError |
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| 476 | except TransformError: |
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| 477 | field[-1] += self.document.reporter.warning( |
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| 478 | 'Bibliographic field "%s" incompatible with extraction: ' |
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| 479 | 'it must contain either a single paragraph (with authors ' |
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| 480 | 'separated by one of "%s"), multiple paragraphs (one per ' |
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| 481 | 'author), or a bullet list with one paragraph (one author) ' |
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| 482 | 'per item.' |
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| 483 | % (name, ''.join(self.language.author_separators)), |
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| 484 | base_node=field) |
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| 485 | raise |
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| 486 | |
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| 487 | def authors_from_one_paragraph(self, field): |
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| 488 | text = field[1][0].astext().strip() |
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| 489 | if not text: |
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| 490 | raise TransformError |
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| 491 | for authorsep in self.language.author_separators: |
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| 492 | authornames = text.split(authorsep) |
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| 493 | if len(authornames) > 1: |
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| 494 | break |
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| 495 | authornames = [author.strip() for author in authornames] |
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| 496 | authors = [[nodes.Text(author)] for author in authornames if author] |
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| 497 | return authors |
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| 498 | |
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| 499 | def authors_from_bullet_list(self, field): |
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| 500 | authors = [] |
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| 501 | for item in field[1][0]: |
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| 502 | if len(item) != 1 or not isinstance(item[0], nodes.paragraph): |
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| 503 | raise TransformError |
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| 504 | authors.append(item[0].children) |
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| 505 | if not authors: |
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| 506 | raise TransformError |
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| 507 | return authors |
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| 508 | |
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| 509 | def authors_from_paragraphs(self, field): |
---|
| 510 | for item in field[1]: |
---|
| 511 | if not isinstance(item, nodes.paragraph): |
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| 512 | raise TransformError |
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| 513 | authors = [item.children for item in field[1]] |
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| 514 | return authors |
---|