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