require 'ripper/core'

[0] Fix | Delete

require 'ripper/lexer'

[1] Fix | Delete

require 'ripper/filter'

[2] Fix | Delete

require 'ripper/sexp'

[3] Fix | Delete

[4] Fix | Delete

# Ripper is a Ruby script parser.

[5] Fix | Delete

#

[6] Fix | Delete

# You can get information from the parser with event-based style.

[7] Fix | Delete

# Information such as abstract syntax trees or simple lexical analysis of the

[8] Fix | Delete

# Ruby program.

[9] Fix | Delete

#

[10] Fix | Delete

# == Usage

[11] Fix | Delete

#

[12] Fix | Delete

# Ripper provides an easy interface for parsing your program into a symbolic

[13] Fix | Delete

# expression tree (or S-expression).

[14] Fix | Delete

#

[15] Fix | Delete

# Understanding the output of the parser may come as a challenge, it's

[16] Fix | Delete

# recommended you use PP to format the output for legibility.

[17] Fix | Delete

#

[18] Fix | Delete

# require 'ripper'

[19] Fix | Delete

# require 'pp'

[20] Fix | Delete

#

[21] Fix | Delete

# pp Ripper.sexp('def hello(world) "Hello, #{world}!"; end')

[22] Fix | Delete

# #=> [:program,

[23] Fix | Delete

# [[:def,

[24] Fix | Delete

# [:@ident, "hello", [1, 4]],

[25] Fix | Delete

# [:paren,

[26] Fix | Delete

# [:params, [[:@ident, "world", [1, 10]]], nil, nil, nil, nil, nil, nil]],

[27] Fix | Delete

# [:bodystmt,

[28] Fix | Delete

# [[:string_literal,

[29] Fix | Delete

# [:string_content,

[30] Fix | Delete

# [:@tstring_content, "Hello, ", [1, 18]],

[31] Fix | Delete

# [:string_embexpr, [[:var_ref, [:@ident, "world", [1, 27]]]]],

[32] Fix | Delete

# [:@tstring_content, "!", [1, 33]]]]],

[33] Fix | Delete

# nil,

[34] Fix | Delete

# nil,

[35] Fix | Delete

# nil]]]]

[36] Fix | Delete

#

[37] Fix | Delete

# You can see in the example above, the expression starts with +:program+.

[38] Fix | Delete

#

[39] Fix | Delete

# From here, a method definition at +:def+, followed by the method's identifier

[40] Fix | Delete

# <code>:@ident</code>. After the method's identifier comes the parentheses

[41] Fix | Delete

# +:paren+ and the method parameters under +:params+.

[42] Fix | Delete

#

[43] Fix | Delete

# Next is the method body, starting at +:bodystmt+ (+stmt+ meaning statement),

[44] Fix | Delete

# which contains the full definition of the method.

[45] Fix | Delete

#

[46] Fix | Delete

# In our case, we're simply returning a String, so next we have the

[47] Fix | Delete

# +:string_literal+ expression.

[48] Fix | Delete

#

[49] Fix | Delete

# Within our +:string_literal+ you'll notice two <code>@tstring_content</code>,

[50] Fix | Delete

# this is the literal part for <code>Hello, </code> and <code>!</code>. Between

[51] Fix | Delete

# the two <code>@tstring_content</code> statements is a +:string_embexpr+,

[52] Fix | Delete

# where _embexpr_ is an embedded expression. Our expression consists of a local

[53] Fix | Delete

# variable, or +var_ref+, with the identifier (<code>@ident</code>) of +world+.

[54] Fix | Delete

#

[55] Fix | Delete

# == Resources

[56] Fix | Delete

#

[57] Fix | Delete

# * {Ruby Inside}[http://www.rubyinside.com/using-ripper-to-see-how-ruby-is-parsing-your-code-5270.html]

[58] Fix | Delete

#

[59] Fix | Delete

# == Requirements

[60] Fix | Delete

#

[61] Fix | Delete

# * ruby 1.9 (support CVS HEAD only)

[62] Fix | Delete

# * bison 1.28 or later (Other yaccs do not work)

[63] Fix | Delete

#

[64] Fix | Delete

# == License

[65] Fix | Delete

#

[66] Fix | Delete

# Ruby License.

[67] Fix | Delete

#

[68] Fix | Delete

# Minero Aoki

[69] Fix | Delete

# aamine@loveruby.net

[70] Fix | Delete

# http://i.loveruby.net

[71] Fix | Delete

class Ripper; end

[72] Fix | Delete

[73] Fix | Delete