Parsing for Fun and Profit
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Slides from my talk Parsing for Fun and Profit, code is available here: https://github.com/patchspace/parsing_for_fun_and_profit
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Parsing for Fun and Profit
- 1. Parsing for Fun and Profit (but mainly fun) Ash Moran ash.moran@patchspace.co.uk PatchSpace Ltd Saturday, 23 February 13
- 3. Parsing Adding structure and meaning to text Saturday, 23 February 13
- 4. Parsing Human Languages Jake stretched his legs “Jake”, “stretched”, “his”, “legs” “Jake”<noun>, “stretched”<verb, past>, “his”<possessive pronoun>, “legs”<noun> “Jake” <noun, subject>, “stretched”, (“his”, “legs”)<noun phrase, object> Saturday, 23 February 13
- 5. Parsing Computer Languages “foo = bar + 123” “foo”, “=”, “bar”, “+”, “123” “foo”<var>, “=”<assignment_op>, “bar”<var>, “+”<op_plus>, “123”<int_literal> Saturday, 23 February 13
- 7. Not just compiling! Compilers breathe fire. Saturday, 23 February 13
- 8. Pretty Printing Saturday, 23 February 13
- 9. Pretty Printing gofmt http://gofmt.com/ Saturday, 23 February 13
- 10. Code Smell Detectors https://rubygems.org/gems/reek Saturday, 23 February 13
- 11. Code Smell Detectors Saturday, 23 February 13
- 12. Other ideas Code metrics Bug detectors Domain-specific languages Language translators (e.g. Ruby -> PHP) Code obfuscators Alternative syntaxes (e.g. CoffeeScript) Refactoring tools Saturday, 23 February 13
- 13. How? Saturday, 23 February 13
- 14. Step 1 3 year computer science degree Saturday, 23 February 13
- 15. Lexing/Tokenising if x > 100 then return “big” else return “small” if x > 100 then return “big” else return “small” Saturday, 23 February 13
- 16. Tree Building if x > 100 then return “big” else return a + b if > then else x 100 return return “big” + a b Saturday, 23 February 13
- 17. Parsing Expression Grammars Like regular expressions, but can handle recursion, e.g. HTML Not actually that much harder to use Saturday, 23 February 13
- 18. Regexes and HTML Saturday, 23 February 13
- 19. Treetop PEG grammar Saturday, 23 February 13
- 20. Doing Sums Saturday, 23 February 13
- 21. Switch to Sublime Text, idiot Code is now available: https://github.com/patchspace/parsing_for_fun_and_profit/ Saturday, 23 February 13
- 22. A Ruby Syntax Highlighter Saturday, 23 February 13
- 23. What A tool to read in simple Ruby source and output syntax highlighted HTML Saturday, 23 February 13
- 24. Why Because I thought it would be fun It was Because I thought it would be easy … Saturday, 23 February 13
- 25. Why Saturday, 23 February 13
- 26. How Build a parse tree of the Ruby source Walk the tree and spit out a <span> element for each bit of text Oh yes, make sure each line goes in <div> and <pre> tags Wrap it in <html> And for bonus points, do some fancy method highlighting Saturday, 23 February 13
- 27. Switch to Chrome, idiot Saturday, 23 February 13
- 28. Switch to Sublime Text again, idiot Code is now available: https://github.com/patchspace/parsing_for_fun_and_profit/ Saturday, 23 February 13
- 29. We’re doing this the hard way Ruby’s grammar is too complex and undefined to easily implement as a PEG Tools for parsing Ruby already exist Saturday, 23 February 13
- 30. Ripper (Ruby 1.9.3) Saturday, 23 February 13
- 31. Learn more! Skip theoretical physics, start by playing with Lego Saturday, 23 February 13
- 32. Do more Ideas you might like to try: CSV parser JSON parser (return arrays & hashes) XML parser JSON highlighter A simple JavaScript minifier (just kill whitespace) Saturday, 23 February 13
- 33. Thank you Ash Moran ash.moran@patchspace.co.uk PatchSpace Ltd Saturday, 23 February 13