Implement named references #41
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yui-knk
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Jun 12, 2023
lib/lrama/lexer.rb
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| @@ -257,6 +288,9 @@ def lex_user_code(ss, line, column, lines) | |||
| when ss.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1 | |||
| tag = ss[1] ? create_token(Token::Tag, ss[1], line, str.length) : nil | |||
| references << [:dollar, Integer(ss[2]), tag, str.length, str.length + ss[0].length - 1] | |||
| when ss.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z0-9_]+)/) # $foo, $expr, $<long>program | |||
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I guess the second capture ([a-zA-Z0-9_]+) might be same with the capture for Token::Named_Ref except for [] (so that [a-zA-Z_.][-a-zA-Z0-9_.]*).
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Sorry, exactly saying ...
It might be same with one of two:
Token::Ident([a-zA-Z_.][-a-zA-Z0-9_.]*)Token::Named_Refexcept for[](so that[a-zA-Z_.][-a-zA-Z0-9_.]*)
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Thank you for reviewing. Is this the change you were suggesting?
3b8d4e5#diff-816037370d9ebaadd970a429ac66cdf5597623e3f285642396489c85b05b89c5R266
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Yes, if you have concerns, please let me know :)
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Thanks for your PR, I left a comment. Other seems good. |
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yui-knk
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Jun 13, 2023
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Thank you!! |
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Summary
In this pull request, I have implemented the Named References concept from bison.
By merging this pull request, it will be possible to refer to the value by its symbol in the rule or its alias from within the action.
Changes made