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pylambda.py
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pylambda.py
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#!/usr/bin/python
#pip3 install ply
#python3 pylambda
import ply.lex as lex
import ply.yacc as yacc
from lexer import *
from parser import *
from algorithms import multi_step_beta_reduce
import cmd
import time
PROMPT = '>>>'
INTRO_STR = \
"""
o o o
## O O O
# # o O o
# # O o o
# .oOo. O o o .oOoO' `oOOoOO. OoOo. .oOoO .oOoO'
# O o o O O O o O o o O o o O O o
## o O O o o o O o O O o O O o o O
### oOoO' `OoOO Oo `OoO'o O o o `OoO' `OoO'o `OoO'o
# # O o
# # o' OoO'
# ##
Welcome to pylambda 0.02 (2011-02-21) <http://github.com/kid-a/pylambda>
Press CTRL+D to exit
"""
lexer = None
parser = None
class PyLambdaREPL (cmd.Cmd):
"""A REPL for PyLambda."""
def __init__(self, *args, **kwargs):
cmd.Cmd.__init__ (self)
self.prompt = PROMPT
self.intro = INTRO_STR
def emptyline (self):
pass
def default (self, s):
start_time = time.time ()
term = parser.parse (s)
reduced_term = multi_step_beta_reduce (term)
elapsed_time = time.time () - start_time
print(reduced_term)
print("One term reduced in (" + str(round(elapsed_time, 2)) + ") seconds")
def do_EOF(self, line):
print("")
print("Bye!")
return True
if __name__ == "__main__":
lexer = lex.lex ()
parser = yacc.yacc ()
PyLambdaREPL ().cmdloop ()