Sempare Full Text Expression Demo

Copyright (c) 2021 Sempare Limited, Conrad Vermeulen

A simple demo on how to parse a string that could be used for a full text search.

The unit tests illustate the usage.

The project was written in a few hours. I havn't split the lexer out or and it is used for both parsers where a specialisation could be used.

the two types of parsers are:

1. basic with expressions such as the following

		"hello"      ->    text = 'hello'
		"abc" or "def"   -> text = 'abc' or text ='def'
		"abc" "def"   -> text = 'abc' or text ='def'
		"hello%"      ->    text like 'hello%'
		

	you are more likely wanting to expand the string to use wildcards. 

2. more complex expressions with variables:

	name = "hello" and age > 10

	the demo pretty much just parses the expression and does a pretty print

the tests show examples how how to leverage additional operators like contains, startswith, endswith, between, etc

TODO:

• make a bit more generic for customisation
• improve exception handling
• report location of lexing/parsing errors