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# sexpr2indent.py
"""A simple s-expression formatter."""
import re
def parse(sexpr):
position = 0
nesting_level = 0
paren = re.compile(r"(?P<paren_beg>\()|(?P<paren_end>\))")
while True:
match = paren.search(sexpr, position)
if match:
yield nesting_level, sexpr[position: match.start()]
if match.lastgroup == "paren_beg":
nesting_level += 1
elif match.lastgroup == "paren_end":
nesting_level -= 1
position = match.end()
else:
break
def sexpr_indent(sexpr):
for nesting, text in parse(sexpr.replace("\n", "")):
if text.strip(): print " "*nesting, text
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