1 | try: |
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2 | import libxml2 |
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3 | import libxslt |
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4 | except ImportError: |
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5 | HAS_LIBS = False |
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6 | else: |
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7 | HAS_LIBS = True |
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8 | |
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9 | from zope.interface import classProvides, implements, Interface |
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10 | from zope.configuration.fields import Path |
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11 | from zope.schema import TextLine |
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12 | |
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13 | from collective.transmogrifier.interfaces import ISectionBlueprint |
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14 | from collective.transmogrifier.interfaces import ISection |
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15 | from collective.transmogrifier.utils import defaultMatcher |
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16 | |
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17 | class StylesheetRegistry(object): |
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18 | def __init__(self): |
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19 | self.clear() |
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20 | |
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21 | def clear(self): |
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22 | self._stylesheet_info = {} |
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23 | |
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24 | def registerStylesheet(self, source, from_, to, file): |
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25 | name = "%s:%s" % (from_, to) |
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26 | if source in self._stylesheet_info: |
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27 | if name in self._stylesheet_info[source]: |
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28 | raise KeyError('Duplicate stylesheet registration: %s %s %s' % |
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29 | (source, from_, to)) |
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30 | source = self._stylesheet_info.setdefault(source, {}) |
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31 | source[name] = { |
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32 | 'from_': from_, |
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33 | 'to': to, |
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34 | 'file': file |
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35 | } |
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36 | |
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37 | def getStylesheet(self, source, from_, to): |
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38 | name = "%s:%s" % (from_, to) |
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39 | try: |
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40 | return self._stylesheet_info[source][name] |
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41 | except KeyError: |
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42 | return None |
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43 | |
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44 | def listStylesheetNames(self): |
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45 | names = [] |
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46 | for k, v in self._stylesheet_info.items(): |
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47 | for name in v.keys(): |
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48 | names.append("%s:%s" % (k, name)) |
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49 | return tuple(names) |
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50 | |
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51 | stylesheet_registry = StylesheetRegistry() |
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52 | |
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53 | # Test cleanup support |
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54 | from zope.testing.cleanup import addCleanUp |
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55 | addCleanUp(stylesheet_registry.clear) |
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56 | del addCleanUp |
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57 | |
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58 | class IStylesheetDirective(Interface): |
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59 | """ Register XSLT file with the global registry. |
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60 | """ |
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61 | |
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62 | source = TextLine( |
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63 | title=u"Source", |
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64 | description=u"The source of XML data.", |
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65 | required=True |
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66 | ) |
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67 | |
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68 | from_ = TextLine( |
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69 | title=u"From", |
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70 | description=u"Value which describes XML data before transformation.", |
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71 | required=True |
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72 | ) |
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73 | |
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74 | to = TextLine( |
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75 | title=u"To", |
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76 | description=u"Value which describes XML data after transformation.", |
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77 | required=True |
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78 | ) |
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79 | |
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80 | file = Path( |
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81 | title=u"XSLT file", |
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82 | description=u"The XSLT file to register.", |
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83 | required=True |
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84 | ) |
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85 | |
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86 | |
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87 | def stylesheet(_context, source, from_, to, file): |
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88 | """Add a new stylesheet to the registry""" |
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89 | |
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90 | _context.action( |
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91 | discriminator=('stylesheet', source, from_, to), |
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92 | callable=stylesheet_registry.registerStylesheet, |
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93 | args=(source, from_, to, file)) |
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94 | |
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95 | |
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96 | class XSLTSection(object): |
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97 | classProvides(ISectionBlueprint) |
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98 | implements(ISection) |
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99 | |
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100 | def __init__(self, transmogrifier, name, options, previous): |
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101 | self.fileskey = defaultMatcher(options, 'files-key', name, 'files') |
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102 | self.source = options.get('source', 'marshall').strip() |
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103 | self.fromkey = defaultMatcher(options, 'from-key', name, 'from') |
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104 | self.tokey = defaultMatcher(options, 'to-key', name, 'to') |
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105 | |
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106 | self.previous = previous |
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107 | |
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108 | def __iter__(self): |
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109 | source = self.source |
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110 | for item in self.previous: |
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111 | fileskey = self.fileskey(*item.keys())[0] |
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112 | fromkey = self.fromkey(*item.keys())[0] |
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113 | tokey = self.tokey(*item.keys())[0] |
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114 | |
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115 | if not (fileskey and fromkey and tokey): |
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116 | yield item; continue |
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117 | |
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118 | if not (source in item[fileskey] and item[fileskey][source]): |
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119 | yield item; continue |
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120 | |
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121 | from_ = item[fromkey] |
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122 | to = item[tokey] |
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123 | stylesheet_info = stylesheet_registry.getStylesheet(source, from_, to) |
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124 | |
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125 | if stylesheet_info is None: |
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126 | yield item; continue |
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127 | |
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128 | fp = open(stylesheet_info['file'], 'r') |
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129 | stylesheet = fp.read() |
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130 | fp.close() |
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131 | |
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132 | source_dict = item[fileskey][source] |
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133 | source_dict['data'] = self.applyTransformations(source_dict['data'], stylesheet) |
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134 | |
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135 | yield item |
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136 | |
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137 | def applyTransformations(self, xml, xslt): |
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138 | if not HAS_LIBS: |
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139 | raise RuntimeError("Can't apply transformations, libxml2/libxslt packages are not available") |
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140 | # parse document |
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141 | doc = libxml2.parseDoc(xml) |
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142 | # parse stylesheet |
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143 | styledoc = libxml2.parseDoc(xslt) |
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144 | # make style object |
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145 | style = libxslt.parseStylesheetDoc(styledoc) |
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146 | # apply style to document |
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147 | result = style.applyStylesheet(doc, None) |
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148 | # write result to a file |
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149 | transformed = style.saveResultToString(result) |
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150 | # free all documents |
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151 | style.freeStylesheet() |
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152 | doc.freeDoc() |
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153 | result.freeDoc() |
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154 | return transformed |
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