1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
from os import getenv
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_]*)(\})'
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)
value: str = ''
if var in self.vars:
value = self.vars[var]
else:
if self.enable_env:
value = getenv(var, '')
return value
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', dict())
enable_env: bool = self.getConfig('enable_env', False)
var_pattern: VarPattern = VarPattern(VAR_RE, vars, enable_env)
md.inlinePatterns.register(var_pattern, 'variable', 175)
def makeExtension(*args: Any, **kwargs: Any):
return VariableExtension(*args, **kwargs)
|
