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LastCalc's parser is very sophisticated and has many components, but fortunately SequentialParser.java provides a very friendly high-level interface to it, which is used at various points through LastCalc's user-facing code.
Here is a simple usage example:
final SequentialParser sp = SequentialParser.create(); sp.parseNext("a=49+3"); final TokenList res = sp.parseNext("a+1"); System.out.println(res);
This will print "53".
You can see many other usage examples in SequentialParserTest.java - which also serves as a suite of integration tests for all of LastCalc's parsing code.