#! /usr/bin/env python3
#  (Force the script to use the latest build.)
#
#  test_parser.py

import parser, traceback

_numFailed = 0

def testChunk(t, fileName):
    global _numFailed
    print('----', fileName, end=' ')
    try:
        ast = parser.suite(t)
        tup = parser.ast2tuple(ast)
        # this discards the first AST; a huge memory savings when running
        # against a large source file like Tkinter.py.
        ast = None
        new = parser.tuple2ast(tup)
    except parser.ParserError as err:
        print()
        print('parser module raised exception on input file', fileName + ':')
        traceback.print_exc()
        _numFailed = _numFailed + 1
    else:
        if tup != parser.ast2tuple(new):
            print()
            print('parser module failed on input file', fileName)
            _numFailed = _numFailed + 1
        else:
            print('o.k.')

def testFile(fileName):
    t = open(fileName).read()
    testChunk(t, fileName)

def test():
    import sys
    args = sys.argv[1:]
    if not args:
        import glob
        args = glob.glob("*.py")
        args.sort()
    list(map(testFile, args))
    sys.exit(_numFailed != 0)

if __name__ == '__main__':
    test()

@@ -227,25 +227,24 @@
 ry:%0A        
-a
 st = parser.
@@ -265,33 +265,32 @@
    tup = parser.
-a
 st2tuple(ast)%0A  
@@ -282,17 +282,16 @@
 t2tuple(
-a
 st)%0A    
@@ -324,9 +324,8 @@
 rst 
-A
 ST; 
@@ -422,17 +422,16 @@
         
-a
 st = Non
@@ -459,17 +459,16 @@
 r.tuple2
-a
 st(tup)%0A
@@ -700,17 +700,16 @@
  parser.
-a
 st2tuple

Make Demo/parser/test_parser.py run.