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images.py
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# $Id: images.py 8583 2020-12-01 10:53:27Z milde $ # Author: David Goodger <goodger@python.org> # Copyright: This module has been placed in the public domain. """ Directives for figures and simple images. """ __docformat__ = 'reStructuredText' import sys from docutils import nodes, utils from docutils.parsers.rst import Directive from docutils.parsers.rst import directives, states from docutils.nodes import fully_normalize_name, whitespace_normalize_name from docutils.parsers.rst.roles import set_classes try: # check for the Python Imaging Library import PIL.Image except ImportError: try: # sometimes PIL modules are put in PYTHONPATH's root import Image class PIL(object): pass # dummy wrapper PIL.Image = Image except ImportError: PIL = None if sys.version_info >= (3, 0): from urllib.request import url2pathname else: from urllib import url2pathname class Image(Directive): align_h_values = ('left', 'center', 'right') align_v_values = ('top', 'middle', 'bottom') align_values = align_v_values + align_h_values def align(argument): # This is not callable as self.align. We cannot make it a # staticmethod because we're saving an unbound method in # option_spec below. return directives.choice(argument, Image.align_values) required_arguments = 1 optional_arguments = 0 final_argument_whitespace = True option_spec = {'alt': directives.unchanged, 'height': directives.length_or_unitless, 'width': directives.length_or_percentage_or_unitless, 'scale': directives.percentage, 'align': align, 'target': directives.unchanged_required, 'class': directives.class_option, 'name': directives.unchanged} def run(self): if 'align' in self.options: if isinstance(self.state, states.SubstitutionDef): # Check for align_v_values. if self.options['align'] not in self.align_v_values: raise self.error( 'Error in "%s" directive: "%s" is not a valid value ' 'for the "align" option within a substitution ' 'definition. Valid values for "align" are: "%s".' % (self.name, self.options['align'], '", "'.join(self.align_v_values))) elif self.options['align'] not in self.align_h_values: raise self.error( 'Error in "%s" directive: "%s" is not a valid value for ' 'the "align" option. Valid values for "align" are: "%s".' % (self.name, self.options['align'], '", "'.join(self.align_h_values))) messages = [] reference = directives.uri(self.arguments[0]) self.options['uri'] = reference reference_node = None if 'target' in self.options: block = states.escape2null( self.options['target']).splitlines() block = [line for line in block] target_type, data = self.state.parse_target( block, self.block_text, self.lineno) if target_type == 'refuri': reference_node = nodes.reference(refuri=data) elif target_type == 'refname': reference_node = nodes.reference( refname=fully_normalize_name(data), name=whitespace_normalize_name(data)) reference_node.indirect_reference_name = data self.state.document.note_refname(reference_node) else: # malformed target messages.append(data) # data is a system message del self.options['target'] set_classes(self.options) image_node = nodes.image(self.block_text, **self.options) self.add_name(image_node) if reference_node: reference_node += image_node return messages + [reference_node] else: return messages + [image_node] class Figure(Image): def align(argument): return directives.choice(argument, Figure.align_h_values) def figwidth_value(argument): if argument.lower() == 'image': return 'image' else: return directives.length_or_percentage_or_unitless(argument, 'px') option_spec = Image.option_spec.copy() option_spec['figwidth'] = figwidth_value option_spec['figclass'] = directives.class_option option_spec['align'] = align has_content = True def run(self): figwidth = self.options.pop('figwidth', None) figclasses = self.options.pop('figclass', None) align = self.options.pop('align', None) (image_node,) = Image.run(self) if isinstance(image_node, nodes.system_message): return [image_node] figure_node = nodes.figure('', image_node) if figwidth == 'image': if PIL and self.state.document.settings.file_insertion_enabled: imagepath = url2pathname(image_node['uri']) try: img = PIL.Image.open( imagepath.encode(sys.getfilesystemencoding())) except (IOError, UnicodeEncodeError): pass # TODO: warn? else: self.state.document.settings.record_dependencies.add( imagepath.replace('\\', '/')) figure_node['width'] = '%dpx' % img.size[0] del img elif figwidth is not None: figure_node['width'] = figwidth if figclasses: figure_node['classes'] += figclasses if align: figure_node['align'] = align if self.content: node = nodes.Element() # anonymous container for parsing self.state.nested_parse(self.content, self.content_offset, node) first_node = node[0] if isinstance(first_node, nodes.paragraph): caption = nodes.caption(first_node.rawsource, '', *first_node.children) caption.source = first_node.source caption.line = first_node.line figure_node += caption elif not (isinstance(first_node, nodes.comment) and len(first_node) == 0): error = self.state_machine.reporter.error( 'Figure caption must be a paragraph or empty comment.', nodes.literal_block(self.block_text, self.block_text), line=self.lineno) return [figure_node, error] if len(node) > 1: figure_node += nodes.legend('', *node[1:]) return [figure_node]