Hacking parse.y
summary
Patch edits parse.y in MRI 1.9.2 and touches a ~10,000+ line parser to add concrete syntax: added ++ operator, hash association as emoticon-style :=, and new symbol quoting. Changes are C and yacc/lex patches that regenerate token tables; building Ruby on stage repeatedly stalls and once segfaults, so demos are flaky. The claim is implementable but invasive: parsing states and lexer transitions change, tests and make install sometimes fail.
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chapters (10)
- 0:00Introduction
- 3:18Ruby parse.y basics
- 9:03Colon syntax states
- 13:37parse.y source structure
- 20:53New symbol syntax
- 30:29Unary plus operators
- 35:53Incremental ++ operator
- 41:02Hash emoticon syntax
- 46:51No post-increment in Ruby
- 51:38Conclusion
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