github.com/hmdne/rkelly-turbo
RKelly Turbo is a fork of the RKelly Remix which in turn is a fork of RKelly JavaScript parser.
gem install rkelly-turbo
Note that you can’t have rkelly, rkelly-remix, rkelly-turbo (any two) installed at the same time. That would cause a conflict since they’re all included with:
require 'rkelly'
# Iterate over and modify a JavaScript AST. Then print the modified # AST as JavaScript. require 'rkelly' parser = RKelly::Parser.new ast = parser.parse( "for(var i = 0; i < 10; i++) { var x = 5 + 5; }" ) ast.each do |node| node.value = 'hello' if node.value == 'i' node.name = 'hello' if node.respond_to?(:name) && node.name == 'i' end puts ast.to_ecma # => awesome javascript
Currently the original RKelly project is unmaintained. The latest release was in late 2012, and since then the author has not responded to bug reports or pull requests.
I created this fork mainly to satisfy the needs of my JSDuck project, but you too should consider using it, as it fixes several problems in the original RKelly:
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20 x faster in Ruby 1.8.
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2 x faster in Ruby 1.9 and 2.0.
Original RKelly only had a rudimentary support for getting the line number of an AST node, and even that was often wrong.
In RKelly Remix each AST node has a range property, which contains granular data about the exact location of the node in source code:
parser = RKelly::Parser.new ast = parser.parse(<<-eojs) function aaron() { var x = 10; return 1 + 1; } eojs node = ast.pointcut(ReturnNode).matches.first node.range.to_s # <{line:3 char:5 (41)}...{line:3 char:17 (53)}> node.range.from.line # 3 node.range.from.char # 5 node.range.from.index # 41 node.range.to.line # 3 node.range.to.char # 17 node.range.to.index # 53
Original RKelly attempted to associate each comment with a related AST node, but failed to correctly do so, which is understandable, as there is no standard way to do such a mapping. RKelly Remix abandons this and just lists all commenst in the root node, leaving the user with the task of associating them with AST nodes if he desires so (the same approach is taken by another JS parser: Esprima ).
parser = RKelly::Parser.new ast = parser.parse(<<-eojs) /** * This is an awesome test comment. */ function aaron() { // This is a side comment var x = 10; return 1 + 1; // Equals two! } eojs # print out all the comments ast.comments.each do |c| puts c.value end
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List of reserved words matches with ECMAScript 5.1.
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Keywords are allowed in property names.
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Multibyte characters are supported in Ruby >= 1.9.
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Correct parsing of regexes like /[/]/
The MIT License
Copyright © 2007, 2008, 2009, 2021 Aaron Patterson, John Barnette, hmdne
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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