100 lines
2.4 KiB
Python
100 lines
2.4 KiB
Python
"""
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Directive Syntax
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~~~~~~~~~~~~~~~~~
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This syntax is inspired by reStructuredText. The syntax is very powerful,
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that you can define a lot of custom features by your own.
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The syntax looks like::
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.. directive-name:: directive value
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:option-key: option value
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:option-key: option value
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full featured markdown text here
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:copyright: (c) Hsiaoming Yang
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"""
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import re
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__all__ = ['Directive']
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DIRECTIVE_PATTERN = re.compile(
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r'\.\.( +)(?P<name>[a-zA-Z0-9_-]+)\:\: *(?P<value>[^\n]*)\n+'
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r'(?P<options>(?: \1 {0,3}\:[a-zA-Z0-9_-]+\: *[^\n]*\n+)*)'
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r'(?P<text>(?: \1 {0,3}[^\n]*\n+)*)'
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)
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class Directive(object):
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@staticmethod
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def parse_text(m):
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text = m.group('text')
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if not text.strip():
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return ''
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leading = len(m.group(1)) + 2
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text = '\n'.join(line[leading:] for line in text.splitlines())
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return text.lstrip('\n') + '\n'
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@staticmethod
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def parse_options(m):
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text = m.group('options')
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if not text.strip():
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return []
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options = []
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for line in re.split(r'\n+', text):
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line = line.strip()[1:]
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if not line:
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continue
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i = line.find(':')
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k = line[:i]
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v = line[i + 1:].strip()
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options.append((k, v))
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return options
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def register_directive(self, md, name):
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plugin = getattr(md, '_directive', None)
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if not plugin:
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plugin = PluginDirective()
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plugin(md)
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plugin.register_directive(name, self.parse)
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def parse(self, block, m, state):
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raise NotImplementedError()
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def __call__(self, md):
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raise NotImplementedError()
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class PluginDirective(object):
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def __init__(self):
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self._directives = {}
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def register_directive(self, name, fn):
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self._directives[name] = fn
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def parse_block_directive(self, block, m, state):
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name = m.group('name')
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method = self._directives.get(name)
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if method:
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return method(block, m, state)
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token = {
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'type': 'block_error',
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'raw': 'Unsupported directive: ' + name,
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}
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return token
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def __call__(self, md):
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md._directive = self
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md.block.register_rule(
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'directive', DIRECTIVE_PATTERN,
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self.parse_block_directive
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)
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md.block.rules.append('directive')
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