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95 lines
3.7 KiB
95 lines
3.7 KiB
#!/usr/bin/env python
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"""
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PlantUML_ Extension for Python-Markdown_
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========================================
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Syntax:
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::uml:: [format="png|svg"] [classes="class1 class2 ..."] [alt="text for alt"]
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PlantUML script diagram
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::end-uml::
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Example:
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::uml:: format="png" classes="uml myDiagram" alt="My super diagram"
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Goofy -> MickeyMouse: calls
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Goofy <-- MickeyMouse: responds
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::end-uml::
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Options are optional, but if present must be specified in the order format, classes, alt.
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The option value may be enclosed in single or double quotes.
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.. _Python-Markdown: http://pythonhosted.org/Markdown/
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.. _PlantUML: http://plantuml.sourceforge.net/
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"""
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import os
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import re
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import markdown
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from markdown.util import etree
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from .generateUmlDiagram import generate_uml_image
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# For details see https://pythonhosted.org/Markdown/extensions/api.html#blockparser
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class PlantUMLBlockProcessor(markdown.blockprocessors.BlockProcessor):
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# Regular expression inspired by the codehilite Markdown plugin
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RE = re.compile(r'''::uml::
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\s*(format=(?P<quot>"|')(?P<format>\w+)(?P=quot))?
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\s*(classes=(?P<quot1>"|')(?P<classes>[\w\s]+)(?P=quot1))?
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\s*(alt=(?P<quot2>"|')(?P<alt>[\w\s"']+)(?P=quot2))?
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''', re.VERBOSE)
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# Regular expression for identify end of UML script
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RE_END = re.compile(r'::end-uml::\s*$')
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def test(self, parent, block):
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return self.RE.search(block)
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def run(self, parent, blocks):
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block = blocks.pop(0)
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text = block
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# Parse configuration params
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m = self.RE.search(block)
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format = m.group('format') if m.group('format') else self.config['format']
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classes = m.group('classes') if m.group('classes') else self.config['classes']
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alt = m.group('alt') if m.group('alt') else self.config['alt']
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# Read blocks until end marker found
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while blocks and not self.RE_END.search(block):
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block = blocks.pop(0)
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text = text + '\n' + block
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else:
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if not blocks:
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raise RuntimeError("[plantuml] UML block not closed, text is:\n"+text)
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# Remove block header and footer
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text = re.sub(self.RE, "", re.sub(self.RE_END, "", text))
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path = os.path.abspath(os.path.join('output', 'images'))
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if not os.path.exists(path):
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os.makedirs(path)
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# Generate image from PlantUML script
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imageurl = self.config['siteurl']+'/'+generate_uml_image(path, text, format)
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# Create image tag and append to the document
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etree.SubElement(parent, "img", src=imageurl, alt=alt, attrib={'class':classes})
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# For details see https://pythonhosted.org/Markdown/extensions/api.html#extendmarkdown
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class PlantUMLMarkdownExtension(markdown.Extension):
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# For details see https://pythonhosted.org/Markdown/extensions/api.html#configsettings
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def __init__(self, *args, **kwargs):
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self.config = {
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'classes': ["uml","Space separated list of classes for the generated image. Default uml."],
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'alt' : ["uml diagram", "Text to show when image is not available."],
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'format' : ["png", "Format of image to generate (png or svg). Default png."],
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'siteurl': ["", "URL of document, used as a prefix for the image diagram."]
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}
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super(PlantUMLMarkdownExtension, self).__init__(*args, **kwargs)
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def extendMarkdown(self, md, md_globals):
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blockprocessor = PlantUMLBlockProcessor(md.parser)
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blockprocessor.config = self.getConfigs()
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md.parser.blockprocessors.add('plantuml', blockprocessor, '>code')
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def makeExtension(**kwargs):
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return PlantUMLMarkdownExtension(**kwargs)
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