https://github.com/singpolyma/rpnr

Reverse Polish Notation for Ruby
https://github.com/singpolyma/rpnr

Last synced: about 1 month ago
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Reverse Polish Notation for Ruby

• Host: GitHub
• URL: https://github.com/singpolyma/rpnr
• Owner: singpolyma
• License: isc
• Created: 2010-03-17T22:08:02.000Z (almost 15 years ago)
• Default Branch: master
• Last Pushed: 2010-03-31T22:05:55.000Z (almost 15 years ago)
• Last Synced: 2024-10-15T11:34:33.704Z (3 months ago)
• Language: Ruby
• Homepage:
• Size: 102 KB
• Stars: 2
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • License: COPYING

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README

        
= Reverse Polish Notation for Ruby =

== Buiding ==

You will need make, lex, and a C compiler.

Run make

== Running ==

The rpnr utility takes RPNR on standard in and outputs valid Ruby on stanadard out.

rpnr < code.rpnr > code.rb

== RPNR Syntax ==

* Tokens are seperated by whitespace

* '(' and ')' are whitespace

* Tokens that are all non-alphanumeric or start with a ':' are messages

* Tokens in double quotes are strings.

* Tokens in single quotes are symbols.

* Tokens in /.*/ are regular expressions.

* Tokens that are numbers are numbers

When a non-message is encountered, it is pushed onto the stack.

When a message is encountered:

* The top two items are popped

* The next-to-top item is passed the message with the argument being the top

=== Edge cases ===

'a,b' (a b +) :lambda #=> lambda{|a,b| a.send(:'+', b)}

a 1 = #=> a = 1