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# indentedGrammarExample.py
#
# Copyright (c) 2006,2016 Paul McGuire
#
# A sample of a pyparsing grammar using indentation for
# grouping (like Python does).
#
# Updated to use indentedBlock helper method.
#
from pyparsing import *
data = """\
def A(z):
A1
B = 100
G = A2
A2
A3
B
def BB(a,b,c):
BB1
def BBA():
bba1
bba2
bba3
C
D
def spam(x,y):
def eggs(z):
pass
"""
stmt = Forward()
suite = IndentedBlock(stmt)
identifier = Word(alphas, alphanums)
funcDecl = (
"def" + identifier + Group("(" + Optional(delimitedList(identifier)) + ")") + ":"
)
funcDef = Group(funcDecl + suite)
rvalue = Forward()
funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")")
rvalue << (funcCall | identifier | Word(nums))
assignment = Group(identifier + "=" + rvalue)
stmt << (funcDef | assignment | identifier)
module_body = OneOrMore(stmt)
print(data)
parseTree = module_body.parseString(data)
parseTree.pprint()