Sorcerer — Recovering the Source

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: 0.3.1

Limitations

Sorcerer is only testing on Ruby 1.9.

Technically, Sorcerer should work on Ruby 1.8, but since Ripper is 1.9 I’ve only tried it on that platform.

Links

Documents:: http://github.com/jimweirich/sorcerer Git Clone:: git://github.com/jimweirich/sorcerer.git Issue Tracking:: http://www.pivotaltracker.com/projects/56858 Bug Reporting:: http://onestepback.org/cgi-bin/bugs.cgi?project=sorcerer

Examples

  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 = Ripper::SexpBuilder.new("a + b").parse
  puts Sorcerer.source(sexp)

Options

No Options

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

For example, given:

  sexp = Ripper::SexpBuilder.new("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
bar
end

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

Indentation

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
  bar
end

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)

History

• 0.0.7 – Basic single line version

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

• 0.2.0 – Added support for indented output.

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

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