def test_nonexistent_file(self):
# Ensure no exceptions are thrown.
grammar = Grammar("nonexistent.json")
self.assertEqual(grammar.get_desc(), "")
def test_grammar_load(self):
grammar = Grammar("grammars/grammar1.json")
self.assertEqual(grammar.get_desc(), "{a^n # b^n | n > 0}")
examples:
./analyze.py grammars/grammar1.json "a#b"
./analyze.py grammars/grammar1.json ""
"""
import sys
from grammar import Grammar
from grammaranalyzer import GrammarAnalyzer
args = sys.argv
# Helpful usage hints.
if len(args) != 3:
print("usage:")
print("\t./analyze.py <path to grammar json> <input string>\n")
print("examples:")
print("\t./analyze.py grammars/grammar1.json \"a#b\"")
print("\t./analyze.py grammars/grammar1.json \"\"")
sys.exit()
path_to_grammar = args[1]
input_string = args[2]
grammar = Grammar(path_to_grammar)
grammar_analyzer = GrammarAnalyzer(grammar)
if grammar_analyzer.test_string(input_string):
print(grammar.get_desc() + ' CONTAINS "' + input_string + '"')
else:
print(grammar.get_desc() + ' DOES NOT CONTAIN "' + input_string + '"')