Generate Ruby source from a Ripper style AST
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Sorcerer -- Recovering the Source

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Sorcerer will generate Ruby code from a Ripper-like abstract syntax tree (i.e. S-Expressions).

Sorcerer is targetted mainly at small snippets of Ruby code, expressable in a single line. Longer examples may be re-sourced, but they will be rendered in a single line format.

Version: 1.0.0


Sorcerer is only tested on Ruby 1.9 and 2.0.


Description Link
Git Clone git://
Issues / Bug Tracking
Continuous Integration!/jimweirich/sorcerer


  sexp = [:binary,
           [:var_ref, [:@ident, "a", [1, 0]]],
           [:var_ref, [:@ident, "b", [1, 4]]]]
  puts Sorcerer.source(sexp)

will generate

  a + b

Ripper may be used to produce the s-expressions used by Sorcerer. The following will produce the same output.

  sexp ="a + b").parse
  puts Sorcerer.source(sexp)


No Options

By default, sorcerer will output its source in single line mode.

For example, given:

  sexp ="def foo; bar; end").parse

Then the following

  puts Sorcerer.source(sexp)

generates single line output (the default):

def foo; bar; end

Multi-Line Output

If you want multi-line output of source, add the multiline option to the source command.

For example, given the sexp generated above, then this

  puts Sorcerer.source(sexp, multiline: true)

generates multi-line output

def foo

(Note that all multi-line output will have a final newline.)


By default, sorcerer does not indent its multiline output. Adding the "indent" option will cause the output to be indented.

For example, given the sexp generated above, then the following

  puts Sorcerer.source(sexp, indent: true)

generates indented output:

def foo

Debugging Output

If you wish to see the S-Expressions processed by Sorcerer and the output emitted, then use the debug option:

  puts Sorcerer.source(sexp, debug: true)


Sorcerer is available under the terms of the MIT license. See the MIT-LICENSE file for details.


  • 1.0.2 - Fix bug in interpolated regular expression resourcing.

  • 1.0.1 - Add support for missing exception class or variable in rescue (from Trent Ogren).

  • 1.0.0 - Ready for the work, version 1!

  • 0.3.11 - Fix support for subexpressions involving Meth() calls.

  • 0.3.10 - Fix several issues with spaces in argument lists.

  • 0.3.9 - Support %i{} and %I{}.

  • 0.3.8 - Include constants in sub-expressions.

  • 0.3.7 - Include array in sub-expressions.

  • 0.3.6 - Support 'defined?'. Suppress nil, true, false in sub-expressions.

  • 0.3.5 - Add handler for mrhs_new.

  • 0.3.4 - Support 'meth a, b'.

  • 0.3.3 - Fix unary not.

  • 0.3.2 - Support 'def mod.method' syntax.

  • 0.3.1 - 1.9.3 support. Indenting stabby procs. RedCloth not required for testing.

  • 0.3.0 - New hash literal support. Multi-line output always end with a newline.

  • 0.2.0 - Added support for indented output.

  • 0.1.0 - Added support for multi-line output. Improved rendering of a number of constructs

  • 0.0.7 - Basic single line version