1 | # Author: David Goodger |
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2 | # Contact: goodger@users.sourceforge.net |
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3 | # Revision: $Revision: 4233 $ |
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4 | # Date: $Date: 2005-12-29 00:48:48 +0100 (Thu, 29 Dec 2005) $ |
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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 for resolving references. |
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9 | """ |
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10 | |
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11 | __docformat__ = 'reStructuredText' |
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12 | |
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13 | import sys |
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14 | import re |
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15 | from docutils import nodes, utils |
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16 | from docutils.transforms import TransformError, Transform |
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17 | |
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18 | |
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19 | class PropagateTargets(Transform): |
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20 | |
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21 | """ |
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22 | Propagate empty internal targets to the next element. |
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23 | |
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24 | Given the following nodes:: |
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25 | |
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26 | <target ids="internal1" names="internal1"> |
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27 | <target anonymous="1" ids="id1"> |
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28 | <target ids="internal2" names="internal2"> |
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29 | <paragraph> |
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30 | This is a test. |
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31 | |
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32 | PropagateTargets propagates the ids and names of the internal |
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33 | targets preceding the paragraph to the paragraph itself:: |
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34 | |
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35 | <target refid="internal1"> |
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36 | <target anonymous="1" refid="id1"> |
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37 | <target refid="internal2"> |
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38 | <paragraph ids="internal2 id1 internal1" names="internal2 internal1"> |
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39 | This is a test. |
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40 | """ |
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41 | |
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42 | default_priority = 260 |
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43 | |
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44 | def apply(self): |
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45 | for target in self.document.traverse(nodes.target): |
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46 | # Only block-level targets without reference (like ".. target:"): |
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47 | if (isinstance(target.parent, nodes.TextElement) or |
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48 | (target.hasattr('refid') or target.hasattr('refuri') or |
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49 | target.hasattr('refname'))): |
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50 | continue |
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51 | assert len(target) == 0, 'error: block-level target has children' |
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52 | next_node = target.next_node(ascend=1) |
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53 | # Do not move names and ids into Invisibles (we'd lose the |
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54 | # attributes) or different Targetables (e.g. footnotes). |
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55 | if (next_node is not None and |
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56 | ((not isinstance(next_node, nodes.Invisible) and |
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57 | not isinstance(next_node, nodes.Targetable)) or |
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58 | isinstance(next_node, nodes.target))): |
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59 | next_node['ids'].extend(target['ids']) |
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60 | next_node['names'].extend(target['names']) |
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61 | # Set defaults for next_node.expect_referenced_by_name/id. |
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62 | if not hasattr(next_node, 'expect_referenced_by_name'): |
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63 | next_node.expect_referenced_by_name = {} |
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64 | if not hasattr(next_node, 'expect_referenced_by_id'): |
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65 | next_node.expect_referenced_by_id = {} |
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66 | for id in target['ids']: |
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67 | # Update IDs to node mapping. |
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68 | self.document.ids[id] = next_node |
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69 | # If next_node is referenced by id ``id``, this |
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70 | # target shall be marked as referenced. |
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71 | next_node.expect_referenced_by_id[id] = target |
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72 | for name in target['names']: |
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73 | next_node.expect_referenced_by_name[name] = target |
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74 | # If there are any expect_referenced_by_... attributes |
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75 | # in target set, copy them to next_node. |
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76 | next_node.expect_referenced_by_name.update( |
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77 | getattr(target, 'expect_referenced_by_name', {})) |
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78 | next_node.expect_referenced_by_id.update( |
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79 | getattr(target, 'expect_referenced_by_id', {})) |
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80 | # Set refid to point to the first former ID of target |
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81 | # which is now an ID of next_node. |
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82 | target['refid'] = target['ids'][0] |
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83 | # Clear ids and names; they have been moved to |
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84 | # next_node. |
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85 | target['ids'] = [] |
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86 | target['names'] = [] |
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87 | self.document.note_refid(target) |
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88 | |
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89 | |
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90 | class AnonymousHyperlinks(Transform): |
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91 | |
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92 | """ |
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93 | Link anonymous references to targets. Given:: |
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94 | |
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95 | <paragraph> |
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96 | <reference anonymous="1"> |
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97 | internal |
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98 | <reference anonymous="1"> |
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99 | external |
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100 | <target anonymous="1" ids="id1"> |
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101 | <target anonymous="1" ids="id2" refuri="http://external"> |
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102 | |
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103 | Corresponding references are linked via "refid" or resolved via "refuri":: |
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104 | |
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105 | <paragraph> |
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106 | <reference anonymous="1" refid="id1"> |
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107 | text |
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108 | <reference anonymous="1" refuri="http://external"> |
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109 | external |
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110 | <target anonymous="1" ids="id1"> |
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111 | <target anonymous="1" ids="id2" refuri="http://external"> |
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112 | """ |
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113 | |
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114 | default_priority = 440 |
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115 | |
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116 | def apply(self): |
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117 | anonymous_refs = [] |
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118 | anonymous_targets = [] |
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119 | for node in self.document.traverse(nodes.reference): |
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120 | if node.get('anonymous'): |
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121 | anonymous_refs.append(node) |
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122 | for node in self.document.traverse(nodes.target): |
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123 | if node.get('anonymous'): |
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124 | anonymous_targets.append(node) |
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125 | if len(anonymous_refs) \ |
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126 | != len(anonymous_targets): |
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127 | msg = self.document.reporter.error( |
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128 | 'Anonymous hyperlink mismatch: %s references but %s ' |
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129 | 'targets.\nSee "backrefs" attribute for IDs.' |
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130 | % (len(anonymous_refs), len(anonymous_targets))) |
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131 | msgid = self.document.set_id(msg) |
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132 | for ref in anonymous_refs: |
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133 | prb = nodes.problematic( |
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134 | ref.rawsource, ref.rawsource, refid=msgid) |
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135 | prbid = self.document.set_id(prb) |
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136 | msg.add_backref(prbid) |
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137 | ref.replace_self(prb) |
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138 | return |
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139 | for ref, target in zip(anonymous_refs, anonymous_targets): |
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140 | target.referenced = 1 |
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141 | while 1: |
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142 | if target.hasattr('refuri'): |
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143 | ref['refuri'] = target['refuri'] |
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144 | ref.resolved = 1 |
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145 | break |
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146 | else: |
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147 | if not target['ids']: |
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148 | # Propagated target. |
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149 | target = self.document.ids[target['refid']] |
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150 | continue |
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151 | ref['refid'] = target['ids'][0] |
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152 | self.document.note_refid(ref) |
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153 | break |
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154 | |
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155 | |
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156 | class IndirectHyperlinks(Transform): |
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157 | |
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158 | """ |
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159 | a) Indirect external references:: |
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160 | |
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161 | <paragraph> |
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162 | <reference refname="indirect external"> |
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163 | indirect external |
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164 | <target id="id1" name="direct external" |
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165 | refuri="http://indirect"> |
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166 | <target id="id2" name="indirect external" |
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167 | refname="direct external"> |
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168 | |
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169 | The "refuri" attribute is migrated back to all indirect targets |
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170 | from the final direct target (i.e. a target not referring to |
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171 | another indirect target):: |
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172 | |
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173 | <paragraph> |
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174 | <reference refname="indirect external"> |
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175 | indirect external |
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176 | <target id="id1" name="direct external" |
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177 | refuri="http://indirect"> |
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178 | <target id="id2" name="indirect external" |
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179 | refuri="http://indirect"> |
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180 | |
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181 | Once the attribute is migrated, the preexisting "refname" attribute |
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182 | is dropped. |
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183 | |
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184 | b) Indirect internal references:: |
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185 | |
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186 | <target id="id1" name="final target"> |
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187 | <paragraph> |
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188 | <reference refname="indirect internal"> |
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189 | indirect internal |
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190 | <target id="id2" name="indirect internal 2" |
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191 | refname="final target"> |
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192 | <target id="id3" name="indirect internal" |
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193 | refname="indirect internal 2"> |
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194 | |
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195 | Targets which indirectly refer to an internal target become one-hop |
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196 | indirect (their "refid" attributes are directly set to the internal |
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197 | target's "id"). References which indirectly refer to an internal |
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198 | target become direct internal references:: |
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199 | |
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200 | <target id="id1" name="final target"> |
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201 | <paragraph> |
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202 | <reference refid="id1"> |
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203 | indirect internal |
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204 | <target id="id2" name="indirect internal 2" refid="id1"> |
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205 | <target id="id3" name="indirect internal" refid="id1"> |
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206 | """ |
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207 | |
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208 | default_priority = 460 |
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209 | |
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210 | def apply(self): |
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211 | for target in self.document.indirect_targets: |
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212 | if not target.resolved: |
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213 | self.resolve_indirect_target(target) |
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214 | self.resolve_indirect_references(target) |
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215 | |
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216 | def resolve_indirect_target(self, target): |
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217 | refname = target.get('refname') |
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218 | if refname is None: |
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219 | reftarget_id = target['refid'] |
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220 | else: |
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221 | reftarget_id = self.document.nameids.get(refname) |
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222 | if not reftarget_id: |
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223 | # Check the unknown_reference_resolvers |
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224 | for resolver_function in \ |
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225 | self.document.transformer.unknown_reference_resolvers: |
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226 | if resolver_function(target): |
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227 | break |
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228 | else: |
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229 | self.nonexistent_indirect_target(target) |
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230 | return |
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231 | reftarget = self.document.ids[reftarget_id] |
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232 | reftarget.note_referenced_by(id=reftarget_id) |
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233 | if isinstance(reftarget, nodes.target) \ |
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234 | and not reftarget.resolved and reftarget.hasattr('refname'): |
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235 | if hasattr(target, 'multiply_indirect'): |
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236 | #and target.multiply_indirect): |
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237 | #del target.multiply_indirect |
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238 | self.circular_indirect_reference(target) |
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239 | return |
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240 | target.multiply_indirect = 1 |
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241 | self.resolve_indirect_target(reftarget) # multiply indirect |
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242 | del target.multiply_indirect |
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243 | if reftarget.hasattr('refuri'): |
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244 | target['refuri'] = reftarget['refuri'] |
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245 | if target.has_key('refid'): |
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246 | del target['refid'] |
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247 | elif reftarget.hasattr('refid'): |
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248 | target['refid'] = reftarget['refid'] |
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249 | self.document.note_refid(target) |
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250 | else: |
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251 | if reftarget['ids']: |
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252 | target['refid'] = reftarget_id |
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253 | self.document.note_refid(target) |
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254 | else: |
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255 | self.nonexistent_indirect_target(target) |
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256 | return |
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257 | if refname is not None: |
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258 | del target['refname'] |
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259 | target.resolved = 1 |
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260 | |
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261 | def nonexistent_indirect_target(self, target): |
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262 | if self.document.nameids.has_key(target['refname']): |
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263 | self.indirect_target_error(target, 'which is a duplicate, and ' |
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264 | 'cannot be used as a unique reference') |
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265 | else: |
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266 | self.indirect_target_error(target, 'which does not exist') |
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267 | |
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268 | def circular_indirect_reference(self, target): |
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269 | self.indirect_target_error(target, 'forming a circular reference') |
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270 | |
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271 | def indirect_target_error(self, target, explanation): |
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272 | naming = '' |
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273 | reflist = [] |
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274 | if target['names']: |
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275 | naming = '"%s" ' % target['names'][0] |
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276 | for name in target['names']: |
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277 | reflist.extend(self.document.refnames.get(name, [])) |
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278 | for id in target['ids']: |
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279 | reflist.extend(self.document.refids.get(id, [])) |
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280 | naming += '(id="%s")' % target['ids'][0] |
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281 | msg = self.document.reporter.error( |
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282 | 'Indirect hyperlink target %s refers to target "%s", %s.' |
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283 | % (naming, target['refname'], explanation), base_node=target) |
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284 | msgid = self.document.set_id(msg) |
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285 | for ref in uniq(reflist): |
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286 | prb = nodes.problematic( |
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287 | ref.rawsource, ref.rawsource, refid=msgid) |
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288 | prbid = self.document.set_id(prb) |
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289 | msg.add_backref(prbid) |
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290 | ref.replace_self(prb) |
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291 | target.resolved = 1 |
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292 | |
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293 | def resolve_indirect_references(self, target): |
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294 | if target.hasattr('refid'): |
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295 | attname = 'refid' |
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296 | call_method = self.document.note_refid |
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297 | elif target.hasattr('refuri'): |
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298 | attname = 'refuri' |
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299 | call_method = None |
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300 | else: |
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301 | return |
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302 | attval = target[attname] |
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303 | for name in target['names']: |
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304 | reflist = self.document.refnames.get(name, []) |
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305 | if reflist: |
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306 | target.note_referenced_by(name=name) |
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307 | for ref in reflist: |
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308 | if ref.resolved: |
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309 | continue |
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310 | del ref['refname'] |
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311 | ref[attname] = attval |
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312 | if call_method: |
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313 | call_method(ref) |
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314 | ref.resolved = 1 |
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315 | if isinstance(ref, nodes.target): |
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316 | self.resolve_indirect_references(ref) |
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317 | for id in target['ids']: |
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318 | reflist = self.document.refids.get(id, []) |
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319 | if reflist: |
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320 | target.note_referenced_by(id=id) |
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321 | for ref in reflist: |
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322 | if ref.resolved: |
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323 | continue |
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324 | del ref['refid'] |
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325 | ref[attname] = attval |
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326 | if call_method: |
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327 | call_method(ref) |
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328 | ref.resolved = 1 |
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329 | if isinstance(ref, nodes.target): |
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330 | self.resolve_indirect_references(ref) |
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331 | |
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332 | |
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333 | class ExternalTargets(Transform): |
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334 | |
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335 | """ |
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336 | Given:: |
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337 | |
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338 | <paragraph> |
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339 | <reference refname="direct external"> |
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340 | direct external |
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341 | <target id="id1" name="direct external" refuri="http://direct"> |
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342 | |
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343 | The "refname" attribute is replaced by the direct "refuri" attribute:: |
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344 | |
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345 | <paragraph> |
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346 | <reference refuri="http://direct"> |
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347 | direct external |
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348 | <target id="id1" name="direct external" refuri="http://direct"> |
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349 | """ |
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350 | |
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351 | default_priority = 640 |
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352 | |
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353 | def apply(self): |
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354 | for target in self.document.traverse(nodes.target): |
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355 | if target.hasattr('refuri'): |
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356 | refuri = target['refuri'] |
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357 | for name in target['names']: |
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358 | reflist = self.document.refnames.get(name, []) |
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359 | if reflist: |
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360 | target.note_referenced_by(name=name) |
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361 | for ref in reflist: |
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362 | if ref.resolved: |
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363 | continue |
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364 | del ref['refname'] |
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365 | ref['refuri'] = refuri |
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366 | ref.resolved = 1 |
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367 | |
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368 | |
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369 | class InternalTargets(Transform): |
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370 | |
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371 | default_priority = 660 |
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372 | |
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373 | def apply(self): |
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374 | for target in self.document.traverse(nodes.target): |
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375 | if not target.hasattr('refuri') and not target.hasattr('refid'): |
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376 | self.resolve_reference_ids(target) |
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377 | |
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378 | def resolve_reference_ids(self, target): |
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379 | """ |
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380 | Given:: |
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381 | |
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382 | <paragraph> |
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383 | <reference refname="direct internal"> |
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384 | direct internal |
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385 | <target id="id1" name="direct internal"> |
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386 | |
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387 | The "refname" attribute is replaced by "refid" linking to the target's |
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388 | "id":: |
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389 | |
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390 | <paragraph> |
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391 | <reference refid="id1"> |
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392 | direct internal |
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393 | <target id="id1" name="direct internal"> |
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394 | """ |
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395 | for name in target['names']: |
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396 | refid = self.document.nameids[name] |
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397 | reflist = self.document.refnames.get(name, []) |
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398 | if reflist: |
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399 | target.note_referenced_by(name=name) |
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400 | for ref in reflist: |
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401 | if ref.resolved: |
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402 | continue |
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403 | del ref['refname'] |
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404 | ref['refid'] = refid |
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405 | ref.resolved = 1 |
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406 | |
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407 | |
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408 | class Footnotes(Transform): |
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409 | |
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410 | """ |
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411 | Assign numbers to autonumbered footnotes, and resolve links to footnotes, |
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412 | citations, and their references. |
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413 | |
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414 | Given the following ``document`` as input:: |
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415 | |
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416 | <document> |
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417 | <paragraph> |
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418 | A labeled autonumbered footnote referece: |
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419 | <footnote_reference auto="1" id="id1" refname="footnote"> |
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420 | <paragraph> |
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421 | An unlabeled autonumbered footnote referece: |
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422 | <footnote_reference auto="1" id="id2"> |
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423 | <footnote auto="1" id="id3"> |
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424 | <paragraph> |
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425 | Unlabeled autonumbered footnote. |
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426 | <footnote auto="1" id="footnote" name="footnote"> |
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427 | <paragraph> |
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428 | Labeled autonumbered footnote. |
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429 | |
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430 | Auto-numbered footnotes have attribute ``auto="1"`` and no label. |
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431 | Auto-numbered footnote_references have no reference text (they're |
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432 | empty elements). When resolving the numbering, a ``label`` element |
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433 | is added to the beginning of the ``footnote``, and reference text |
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434 | to the ``footnote_reference``. |
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435 | |
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436 | The transformed result will be:: |
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437 | |
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438 | <document> |
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439 | <paragraph> |
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440 | A labeled autonumbered footnote referece: |
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441 | <footnote_reference auto="1" id="id1" refid="footnote"> |
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442 | 2 |
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443 | <paragraph> |
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444 | An unlabeled autonumbered footnote referece: |
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445 | <footnote_reference auto="1" id="id2" refid="id3"> |
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446 | 1 |
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447 | <footnote auto="1" id="id3" backrefs="id2"> |
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448 | <label> |
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449 | 1 |
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450 | <paragraph> |
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451 | Unlabeled autonumbered footnote. |
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452 | <footnote auto="1" id="footnote" name="footnote" backrefs="id1"> |
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453 | <label> |
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454 | 2 |
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455 | <paragraph> |
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456 | Labeled autonumbered footnote. |
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457 | |
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458 | Note that the footnotes are not in the same order as the references. |
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459 | |
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460 | The labels and reference text are added to the auto-numbered ``footnote`` |
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461 | and ``footnote_reference`` elements. Footnote elements are backlinked to |
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462 | their references via "refids" attributes. References are assigned "id" |
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463 | and "refid" attributes. |
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464 | |
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465 | After adding labels and reference text, the "auto" attributes can be |
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466 | ignored. |
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467 | """ |
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468 | |
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469 | default_priority = 620 |
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470 | |
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471 | autofootnote_labels = None |
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472 | """Keep track of unlabeled autonumbered footnotes.""" |
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473 | |
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474 | symbols = [ |
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475 | # Entries 1-4 and 6 below are from section 12.51 of |
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476 | # The Chicago Manual of Style, 14th edition. |
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477 | '*', # asterisk/star |
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478 | u'\u2020', # dagger † |
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479 | u'\u2021', # double dagger ‡ |
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480 | u'\u00A7', # section mark § |
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481 | u'\u00B6', # paragraph mark (pilcrow) ¶ |
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482 | # (parallels ['||'] in CMoS) |
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483 | '#', # number sign |
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484 | # The entries below were chosen arbitrarily. |
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485 | u'\u2660', # spade suit ♠ |
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486 | u'\u2665', # heart suit ♥ |
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487 | u'\u2666', # diamond suit ♦ |
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488 | u'\u2663', # club suit ♣ |
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489 | ] |
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490 | |
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491 | def apply(self): |
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492 | self.autofootnote_labels = [] |
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493 | startnum = self.document.autofootnote_start |
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494 | self.document.autofootnote_start = self.number_footnotes(startnum) |
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495 | self.number_footnote_references(startnum) |
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496 | self.symbolize_footnotes() |
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497 | self.resolve_footnotes_and_citations() |
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498 | |
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499 | def number_footnotes(self, startnum): |
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500 | """ |
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501 | Assign numbers to autonumbered footnotes. |
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502 | |
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503 | For labeled autonumbered footnotes, copy the number over to |
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504 | corresponding footnote references. |
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505 | """ |
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506 | for footnote in self.document.autofootnotes: |
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507 | while 1: |
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508 | label = str(startnum) |
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509 | startnum += 1 |
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510 | if not self.document.nameids.has_key(label): |
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511 | break |
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512 | footnote.insert(0, nodes.label('', label)) |
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513 | for name in footnote['names']: |
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514 | for ref in self.document.footnote_refs.get(name, []): |
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515 | ref += nodes.Text(label) |
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516 | ref.delattr('refname') |
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517 | assert len(footnote['ids']) == len(ref['ids']) == 1 |
---|
518 | ref['refid'] = footnote['ids'][0] |
---|
519 | footnote.add_backref(ref['ids'][0]) |
---|
520 | self.document.note_refid(ref) |
---|
521 | ref.resolved = 1 |
---|
522 | if not footnote['names'] and not footnote['dupnames']: |
---|
523 | footnote['names'].append(label) |
---|
524 | self.document.note_explicit_target(footnote, footnote) |
---|
525 | self.autofootnote_labels.append(label) |
---|
526 | return startnum |
---|
527 | |
---|
528 | def number_footnote_references(self, startnum): |
---|
529 | """Assign numbers to autonumbered footnote references.""" |
---|
530 | i = 0 |
---|
531 | for ref in self.document.autofootnote_refs: |
---|
532 | if ref.resolved or ref.hasattr('refid'): |
---|
533 | continue |
---|
534 | try: |
---|
535 | label = self.autofootnote_labels[i] |
---|
536 | except IndexError: |
---|
537 | msg = self.document.reporter.error( |
---|
538 | 'Too many autonumbered footnote references: only %s ' |
---|
539 | 'corresponding footnotes available.' |
---|
540 | % len(self.autofootnote_labels), base_node=ref) |
---|
541 | msgid = self.document.set_id(msg) |
---|
542 | for ref in self.document.autofootnote_refs[i:]: |
---|
543 | if ref.resolved or ref.hasattr('refname'): |
---|
544 | continue |
---|
545 | prb = nodes.problematic( |
---|
546 | ref.rawsource, ref.rawsource, refid=msgid) |
---|
547 | prbid = self.document.set_id(prb) |
---|
548 | msg.add_backref(prbid) |
---|
549 | ref.replace_self(prb) |
---|
550 | break |
---|
551 | ref += nodes.Text(label) |
---|
552 | id = self.document.nameids[label] |
---|
553 | footnote = self.document.ids[id] |
---|
554 | ref['refid'] = id |
---|
555 | self.document.note_refid(ref) |
---|
556 | assert len(ref['ids']) == 1 |
---|
557 | footnote.add_backref(ref['ids'][0]) |
---|
558 | ref.resolved = 1 |
---|
559 | i += 1 |
---|
560 | |
---|
561 | def symbolize_footnotes(self): |
---|
562 | """Add symbols indexes to "[*]"-style footnotes and references.""" |
---|
563 | labels = [] |
---|
564 | for footnote in self.document.symbol_footnotes: |
---|
565 | reps, index = divmod(self.document.symbol_footnote_start, |
---|
566 | len(self.symbols)) |
---|
567 | labeltext = self.symbols[index] * (reps + 1) |
---|
568 | labels.append(labeltext) |
---|
569 | footnote.insert(0, nodes.label('', labeltext)) |
---|
570 | self.document.symbol_footnote_start += 1 |
---|
571 | self.document.set_id(footnote) |
---|
572 | i = 0 |
---|
573 | for ref in self.document.symbol_footnote_refs: |
---|
574 | try: |
---|
575 | ref += nodes.Text(labels[i]) |
---|
576 | except IndexError: |
---|
577 | msg = self.document.reporter.error( |
---|
578 | 'Too many symbol footnote references: only %s ' |
---|
579 | 'corresponding footnotes available.' % len(labels), |
---|
580 | base_node=ref) |
---|
581 | msgid = self.document.set_id(msg) |
---|
582 | for ref in self.document.symbol_footnote_refs[i:]: |
---|
583 | if ref.resolved or ref.hasattr('refid'): |
---|
584 | continue |
---|
585 | prb = nodes.problematic( |
---|
586 | ref.rawsource, ref.rawsource, refid=msgid) |
---|
587 | prbid = self.document.set_id(prb) |
---|
588 | msg.add_backref(prbid) |
---|
589 | ref.replace_self(prb) |
---|
590 | break |
---|
591 | footnote = self.document.symbol_footnotes[i] |
---|
592 | assert len(footnote['ids']) == 1 |
---|
593 | ref['refid'] = footnote['ids'][0] |
---|
594 | self.document.note_refid(ref) |
---|
595 | footnote.add_backref(ref['ids'][0]) |
---|
596 | i += 1 |
---|
597 | |
---|
598 | def resolve_footnotes_and_citations(self): |
---|
599 | """ |
---|
600 | Link manually-labeled footnotes and citations to/from their |
---|
601 | references. |
---|
602 | """ |
---|
603 | for footnote in self.document.footnotes: |
---|
604 | for label in footnote['names']: |
---|
605 | if self.document.footnote_refs.has_key(label): |
---|
606 | reflist = self.document.footnote_refs[label] |
---|
607 | self.resolve_references(footnote, reflist) |
---|
608 | for citation in self.document.citations: |
---|
609 | for label in citation['names']: |
---|
610 | if self.document.citation_refs.has_key(label): |
---|
611 | reflist = self.document.citation_refs[label] |
---|
612 | self.resolve_references(citation, reflist) |
---|
613 | |
---|
614 | def resolve_references(self, note, reflist): |
---|
615 | assert len(note['ids']) == 1 |
---|
616 | id = note['ids'][0] |
---|
617 | for ref in reflist: |
---|
618 | if ref.resolved: |
---|
619 | continue |
---|
620 | ref.delattr('refname') |
---|
621 | ref['refid'] = id |
---|
622 | assert len(ref['ids']) == 1 |
---|
623 | note.add_backref(ref['ids'][0]) |
---|
624 | ref.resolved = 1 |
---|
625 | note.resolved = 1 |
---|
626 | |
---|
627 | |
---|
628 | class CircularSubstitutionDefinitionError(Exception): pass |
---|
629 | |
---|
630 | |
---|
631 | class Substitutions(Transform): |
---|
632 | |
---|
633 | """ |
---|
634 | Given the following ``document`` as input:: |
---|
635 | |
---|
636 | <document> |
---|
637 | <paragraph> |
---|
638 | The |
---|
639 | <substitution_reference refname="biohazard"> |
---|
640 | biohazard |
---|
641 | symbol is deservedly scary-looking. |
---|
642 | <substitution_definition name="biohazard"> |
---|
643 | <image alt="biohazard" uri="biohazard.png"> |
---|
644 | |
---|
645 | The ``substitution_reference`` will simply be replaced by the |
---|
646 | contents of the corresponding ``substitution_definition``. |
---|
647 | |
---|
648 | The transformed result will be:: |
---|
649 | |
---|
650 | <document> |
---|
651 | <paragraph> |
---|
652 | The |
---|
653 | <image alt="biohazard" uri="biohazard.png"> |
---|
654 | symbol is deservedly scary-looking. |
---|
655 | <substitution_definition name="biohazard"> |
---|
656 | <image alt="biohazard" uri="biohazard.png"> |
---|
657 | """ |
---|
658 | |
---|
659 | default_priority = 220 |
---|
660 | """The Substitutions transform has to be applied very early, before |
---|
661 | `docutils.tranforms.frontmatter.DocTitle` and others.""" |
---|
662 | |
---|
663 | def apply(self): |
---|
664 | defs = self.document.substitution_defs |
---|
665 | normed = self.document.substitution_names |
---|
666 | subreflist = self.document.traverse(nodes.substitution_reference) |
---|
667 | nested = {} |
---|
668 | for ref in subreflist: |
---|
669 | refname = ref['refname'] |
---|
670 | key = None |
---|
671 | if defs.has_key(refname): |
---|
672 | key = refname |
---|
673 | else: |
---|
674 | normed_name = refname.lower() |
---|
675 | if normed.has_key(normed_name): |
---|
676 | key = normed[normed_name] |
---|
677 | if key is None: |
---|
678 | msg = self.document.reporter.error( |
---|
679 | 'Undefined substitution referenced: "%s".' |
---|
680 | % refname, base_node=ref) |
---|
681 | msgid = self.document.set_id(msg) |
---|
682 | prb = nodes.problematic( |
---|
683 | ref.rawsource, ref.rawsource, refid=msgid) |
---|
684 | prbid = self.document.set_id(prb) |
---|
685 | msg.add_backref(prbid) |
---|
686 | ref.replace_self(prb) |
---|
687 | else: |
---|
688 | subdef = defs[key] |
---|
689 | parent = ref.parent |
---|
690 | index = parent.index(ref) |
---|
691 | if (subdef.attributes.has_key('ltrim') |
---|
692 | or subdef.attributes.has_key('trim')): |
---|
693 | if index > 0 and isinstance(parent[index - 1], |
---|
694 | nodes.Text): |
---|
695 | parent.replace(parent[index - 1], |
---|
696 | parent[index - 1].rstrip()) |
---|
697 | if (subdef.attributes.has_key('rtrim') |
---|
698 | or subdef.attributes.has_key('trim')): |
---|
699 | if (len(parent) > index + 1 |
---|
700 | and isinstance(parent[index + 1], nodes.Text)): |
---|
701 | parent.replace(parent[index + 1], |
---|
702 | parent[index + 1].lstrip()) |
---|
703 | subdef_copy = subdef.deepcopy() |
---|
704 | try: |
---|
705 | # Take care of nested substitution references: |
---|
706 | for nested_ref in subdef_copy.traverse( |
---|
707 | nodes.substitution_reference): |
---|
708 | nested_name = normed[nested_ref['refname'].lower()] |
---|
709 | if nested_name in nested.setdefault(nested_name, []): |
---|
710 | raise CircularSubstitutionDefinitionError |
---|
711 | else: |
---|
712 | nested[nested_name].append(key) |
---|
713 | subreflist.append(nested_ref) |
---|
714 | except CircularSubstitutionDefinitionError: |
---|
715 | parent = ref.parent |
---|
716 | if isinstance(parent, nodes.substitution_definition): |
---|
717 | msg = self.document.reporter.error( |
---|
718 | 'Circular substitution definition detected:', |
---|
719 | nodes.literal_block(parent.rawsource, |
---|
720 | parent.rawsource), |
---|
721 | line=parent.line, base_node=parent) |
---|
722 | parent.replace_self(msg) |
---|
723 | else: |
---|
724 | msg = self.document.reporter.error( |
---|
725 | 'Circular substitution definition referenced: "%s".' |
---|
726 | % refname, base_node=ref) |
---|
727 | msgid = self.document.set_id(msg) |
---|
728 | prb = nodes.problematic( |
---|
729 | ref.rawsource, ref.rawsource, refid=msgid) |
---|
730 | prbid = self.document.set_id(prb) |
---|
731 | msg.add_backref(prbid) |
---|
732 | ref.replace_self(prb) |
---|
733 | else: |
---|
734 | ref.replace_self(subdef_copy.children) |
---|
735 | |
---|
736 | |
---|
737 | class TargetNotes(Transform): |
---|
738 | |
---|
739 | """ |
---|
740 | Creates a footnote for each external target in the text, and corresponding |
---|
741 | footnote references after each reference. |
---|
742 | """ |
---|
743 | |
---|
744 | default_priority = 540 |
---|
745 | """The TargetNotes transform has to be applied after `IndirectHyperlinks` |
---|
746 | but before `Footnotes`.""" |
---|
747 | |
---|
748 | |
---|
749 | def __init__(self, document, startnode): |
---|
750 | Transform.__init__(self, document, startnode=startnode) |
---|
751 | |
---|
752 | self.classes = startnode.details.get('class', []) |
---|
753 | |
---|
754 | def apply(self): |
---|
755 | notes = {} |
---|
756 | nodelist = [] |
---|
757 | for target in self.document.traverse(nodes.target): |
---|
758 | # Only external targets. |
---|
759 | if not target.hasattr('refuri'): |
---|
760 | continue |
---|
761 | names = target['names'] |
---|
762 | refs = [] |
---|
763 | for name in names: |
---|
764 | refs.extend(self.document.refnames.get(name, [])) |
---|
765 | if not refs: |
---|
766 | continue |
---|
767 | footnote = self.make_target_footnote(target['refuri'], refs, |
---|
768 | notes) |
---|
769 | if not notes.has_key(target['refuri']): |
---|
770 | notes[target['refuri']] = footnote |
---|
771 | nodelist.append(footnote) |
---|
772 | # Take care of anonymous references. |
---|
773 | for ref in self.document.traverse(nodes.reference): |
---|
774 | if not ref.get('anonymous'): |
---|
775 | continue |
---|
776 | if ref.hasattr('refuri'): |
---|
777 | footnote = self.make_target_footnote(ref['refuri'], [ref], |
---|
778 | notes) |
---|
779 | if not notes.has_key(ref['refuri']): |
---|
780 | notes[ref['refuri']] = footnote |
---|
781 | nodelist.append(footnote) |
---|
782 | self.startnode.replace_self(nodelist) |
---|
783 | |
---|
784 | def make_target_footnote(self, refuri, refs, notes): |
---|
785 | if notes.has_key(refuri): # duplicate? |
---|
786 | footnote = notes[refuri] |
---|
787 | assert len(footnote['names']) == 1 |
---|
788 | footnote_name = footnote['names'][0] |
---|
789 | else: # original |
---|
790 | footnote = nodes.footnote() |
---|
791 | footnote_id = self.document.set_id(footnote) |
---|
792 | # Use uppercase letters and a colon; they can't be |
---|
793 | # produced inside names by the parser. |
---|
794 | footnote_name = 'TARGET_NOTE: ' + footnote_id |
---|
795 | footnote['auto'] = 1 |
---|
796 | footnote['names'] = [footnote_name] |
---|
797 | footnote_paragraph = nodes.paragraph() |
---|
798 | footnote_paragraph += nodes.reference('', refuri, refuri=refuri) |
---|
799 | footnote += footnote_paragraph |
---|
800 | self.document.note_autofootnote(footnote) |
---|
801 | self.document.note_explicit_target(footnote, footnote) |
---|
802 | for ref in refs: |
---|
803 | if isinstance(ref, nodes.target): |
---|
804 | continue |
---|
805 | refnode = nodes.footnote_reference( |
---|
806 | refname=footnote_name, auto=1) |
---|
807 | refnode['classes'] += self.classes |
---|
808 | self.document.note_autofootnote_ref(refnode) |
---|
809 | self.document.note_footnote_ref(refnode) |
---|
810 | index = ref.parent.index(ref) + 1 |
---|
811 | reflist = [refnode] |
---|
812 | if not utils.get_trim_footnote_ref_space(self.document.settings): |
---|
813 | if self.classes: |
---|
814 | reflist.insert(0, nodes.inline(text=' ', Classes=self.classes)) |
---|
815 | else: |
---|
816 | reflist.insert(0, nodes.Text(' ')) |
---|
817 | ref.parent.insert(index, reflist) |
---|
818 | return footnote |
---|
819 | |
---|
820 | |
---|
821 | class DanglingReferences(Transform): |
---|
822 | |
---|
823 | """ |
---|
824 | Check for dangling references (incl. footnote & citation) and for |
---|
825 | unreferenced targets. |
---|
826 | """ |
---|
827 | |
---|
828 | default_priority = 850 |
---|
829 | |
---|
830 | def apply(self): |
---|
831 | visitor = DanglingReferencesVisitor( |
---|
832 | self.document, |
---|
833 | self.document.transformer.unknown_reference_resolvers) |
---|
834 | self.document.walk(visitor) |
---|
835 | # *After* resolving all references, check for unreferenced |
---|
836 | # targets: |
---|
837 | for target in self.document.traverse(nodes.target): |
---|
838 | if not target.referenced: |
---|
839 | if target.get('anonymous'): |
---|
840 | # If we have unreferenced anonymous targets, there |
---|
841 | # is already an error message about anonymous |
---|
842 | # hyperlink mismatch; no need to generate another |
---|
843 | # message. |
---|
844 | continue |
---|
845 | if target['names']: |
---|
846 | naming = target['names'][0] |
---|
847 | elif target['ids']: |
---|
848 | naming = target['ids'][0] |
---|
849 | else: |
---|
850 | # Hack: Propagated targets always have their refid |
---|
851 | # attribute set. |
---|
852 | naming = target['refid'] |
---|
853 | self.document.reporter.info( |
---|
854 | 'Hyperlink target "%s" is not referenced.' |
---|
855 | % naming, base_node=target) |
---|
856 | |
---|
857 | |
---|
858 | class DanglingReferencesVisitor(nodes.SparseNodeVisitor): |
---|
859 | |
---|
860 | def __init__(self, document, unknown_reference_resolvers): |
---|
861 | nodes.SparseNodeVisitor.__init__(self, document) |
---|
862 | self.document = document |
---|
863 | self.unknown_reference_resolvers = unknown_reference_resolvers |
---|
864 | |
---|
865 | def unknown_visit(self, node): |
---|
866 | pass |
---|
867 | |
---|
868 | def visit_reference(self, node): |
---|
869 | if node.resolved or not node.hasattr('refname'): |
---|
870 | return |
---|
871 | refname = node['refname'] |
---|
872 | id = self.document.nameids.get(refname) |
---|
873 | if id is None: |
---|
874 | for resolver_function in self.unknown_reference_resolvers: |
---|
875 | if resolver_function(node): |
---|
876 | break |
---|
877 | else: |
---|
878 | if self.document.nameids.has_key(refname): |
---|
879 | msg = self.document.reporter.error( |
---|
880 | 'Duplicate target name, cannot be used as a unique ' |
---|
881 | 'reference: "%s".' % (node['refname']), base_node=node) |
---|
882 | else: |
---|
883 | msg = self.document.reporter.error( |
---|
884 | 'Unknown target name: "%s".' % (node['refname']), |
---|
885 | base_node=node) |
---|
886 | msgid = self.document.set_id(msg) |
---|
887 | prb = nodes.problematic( |
---|
888 | node.rawsource, node.rawsource, refid=msgid) |
---|
889 | prbid = self.document.set_id(prb) |
---|
890 | msg.add_backref(prbid) |
---|
891 | node.replace_self(prb) |
---|
892 | else: |
---|
893 | del node['refname'] |
---|
894 | node['refid'] = id |
---|
895 | self.document.ids[id].note_referenced_by(id=id) |
---|
896 | node.resolved = 1 |
---|
897 | |
---|
898 | visit_footnote_reference = visit_citation_reference = visit_reference |
---|
899 | |
---|
900 | |
---|
901 | def uniq(L): |
---|
902 | r = [] |
---|
903 | for item in L: |
---|
904 | if not item in r: |
---|
905 | r.append(item) |
---|
906 | return r |
---|