Add demo-process.py

diff --git a/demo/demo-process.py b/demo/demo-process.py
new file mode 100755 (executable)
index 0000000..5bce038
--- /dev/null
+++ b/demo/demo-process.py
@@ -0,0 +1,68 @@
+#! /usr/bin/env python
+from __future__ import print_function
+
+import argparse
+import sys
+from sqlconvert.process_mysql import process_statement
+from sqlconvert.print_tokens import print_tokens
+from sqlconvert.process_tokens import find_error, StatementGrouper
+
+
+def process_lines(*lines):
+    grouper = StatementGrouper(encoding='utf-8')
+    for line in lines:
+        grouper.process_line(line)
+        if grouper.statements:
+            for statement in grouper.get_statements():
+                print("----------")
+                if find_error(statement):
+                    print("ERRORS IN QUERY")
+                process_statement(statement)
+                print_tokens(statement, encoding='utf-8')
+                print()
+                statement._pprint_tree()
+            print("----------")
+    tokens = grouper.close()
+    if tokens:
+        for token in tokens:
+            print_tokens(token, encoding='utf-8')
+            print(repr(token))
+
+
+def process_test(_args):
+    process_lines(
+        "SELECT * FROM `mytable`; -- line-comment",
+        "INSERT into /* inline comment */ mytable VALUES (1, 'one');",
+        "/*! directive*/ INSERT INTO `MyTable` (`Id`, `Name`) "
+        "VALUES (1, 'one');"
+    )
+
+
+def process_sql(args):
+    process_lines(*args.lines)
+
+
+def process_file(args):
+    infile = open(args.filename, 'rt')
+    lines = infile.readlines()
+    infile.close()
+    process_lines(*lines)
+
+
+if __name__ == '__main__':
+    main_parser = argparse.ArgumentParser(description='Group')
+    subparsers = main_parser.add_subparsers(help='Commands')
+
+    parser = subparsers.add_parser('sql', help='SQL from command line')
+    parser.add_argument('lines', nargs='+', help='SQL lines')
+    parser.set_defaults(func=process_sql)
+
+    parser = subparsers.add_parser('test', help='SQL from test data')
+    parser.set_defaults(func=process_test)
+
+    parser = subparsers.add_parser('file', help='SQL from a file')
+    parser.add_argument('filename', help='SQL file')
+    parser.set_defaults(func=process_file)
+
+    args = main_parser.parse_args()
+    args.func(args)