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import os
from re import Match
from typing import Any
from xml.etree.ElementTree import Element
from markdown import Markdown
from markdown.extensions import Extension
from markdown.inlinepatterns import Pattern
VAR_RE: str = r'(\$\{)([a-zA-Z_0-9]*)(\})'
class VarPattern(Pattern):
# need to redefine as an extra attribute needs to be passed
def __init__(self, pattern: Any,
vars: dict[str, str],
enable_env: bool,
md: Markdown | None = None) -> None:
self.vars: dict[str, str] = vars
self.enable_env: bool = enable_env
super().__init__(pattern, md)
def handleMatch(self, m: Match[str]) -> str | Element | None:
# for some reason the group is offest by 1
var: str | Any = m.group(3)
if var in self.vars:
return self.vars[var]
if self.enable_env:
if var in os.environ:
return os.environ[var]
return ''
class VariableExtension(Extension):
def __init__(self, **kwargs: Any) -> None:
self.config: dict[str, list[Any | str]] = {
'enable_env': [False, 'Enable environment variables parsing.'],
'variables': [dict(), 'Dictionary holding variables to be used.']
}
super().__init__(**kwargs)
def extendMarkdown(self, md: Markdown) -> None:
vars: dict[str, str] | Any = self.getConfig('variables')
enable_env: bool = self.getConfig('enable_env')
var_pattern: VarPattern = VarPattern(VAR_RE, vars, enable_env)
md.inlinePatterns.register(var_pattern, 'variable', 175)
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