Demonstrates how Lark's experimental text-reconstruction feature can recreate
functional Python code from its parse-tree, using just the correct grammar and
a small formatter.
"""
from lark import Token, Lark
from lark.reconstruct import Reconstructor
from lark.indenter import PythonIndenter
python_parser3 = Lark.open_from_package(
'lark',
'python.lark',
['grammars'],
parser='lalr',
postlex=PythonIndenter(),
start='file_input',
maybe_placeholders=False # Necessary for reconstructor
)
SPACE_AFTER = set(',+-*/~@<>="|:')
SPACE_BEFORE = (SPACE_AFTER - set(',:')) | set('\'')
def special(sym):
return Token('SPECIAL', sym.name)
def postproc(items):
stack = ['\n']
This example demonstrates usage of the included Python grammars
"""
import sys
import os, os.path
from io import open
import glob, time
from lark import Lark
from lark.indenter import PythonIndenter
kwargs = dict(postlex=PythonIndenter(), start='file_input')
# Official Python grammar by Lark
python_parser3 = Lark.open_from_package('lark',
'python.lark', ['grammars'],
parser='lalr',
**kwargs)
# Local Python2 grammar
python_parser2 = Lark.open('python2.lark',
rel_to=__file__,
parser='lalr',
**kwargs)
python_parser2_earley = Lark.open('python2.lark',
rel_to=__file__,
parser='earley',
lexer='basic',
**kwargs)
try:
xrange
