Parsing with Parsimonious

Recently I've been playing around with a parsing library for Python called Parsimonious. So far, I've been very impressed with it. Examples can be a bit hard to find; the following is a simple CSV parser:

	from parsimonious.grammar import Grammar
	from parsimonious.nodes import NodeVisitor
	class EntryParser(NodeVisitor):
	def __init__(self, grammar, text):
	self.entry = {}
	ast = Grammar(grammar).parse(text)
	self.visit(ast)
	def visit_name(self, n, vc):
	self.entry['name'] = n.text
	def visit_gender(self, n, vc):
	self.entry['gender'] = n.text
	def visit_age(self, n, vc):
	self.entry['age'] = n.text
	def generic_visit(self, n, vc):
	pass
	grammar = """\
	entry = name sep gender? (sep age)?
	sep = ws "," ws
	ws = " "*
	name = ~"[A-z]*"
	gender = "male" / "female"
	age = ~"[0-9]*"
	"""
	text = """\
	Bob, male, 26
	Kim,female,30
	Joe,male
	"""
	for line in text.splitlines():
	print EntryParser(grammar, line).entry

view raw parsimonious_example.py hosted with ❤ by GitHub

The resulting output is the following:

{'gender': 'male', 'age': '26', 'name': 'Bob'}
{'gender': 'female', 'age': '30', 'name': 'Kim'}
{'gender': 'male', 'name': 'Joe'}