en_GB http://tobyinkster.co.uk/blog/2007/02/10/parsers/ <p>cjl wrote:</p> <blockquote><p>Short of writing a parser, which is clearly beyond me, what are some reasonable approaches to handling user input that will be executed?</p></blockquote> <p>Writing a parser is the best option in the long-run. If you were to attempt to interpret the user input some other way, like pure regular expressions, then you would fall into a lot of traps, and your interpreter would behave oddly in many cases.</p> <p>A full parser is a much better option: it will behave far more reliably and would be a lot easier to extend, should you feel the need to add extra features to the language at a later date.</p> <p>Although it&#8217;s a lot of work, there are some fairly well established methods on writing them. What you basically need to write is three fairly independent components: a tokeniser, a parser and an interpreter. None of these share any code in common, except for the definitions of a few constants and classes.</p> <p>Firstly, a tokeniser, which reads the user input and splits it into a long list of tokens. 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