Path: | README |
Last Update: | Fri Jul 15 14:35:39 -0400 2016 |
INTRODUCTION
Parslet makes developing complex parsers easy. It does so by
Parslet takes the long way around to make your job easier. It allows for incremental language construction. Often, you start out small, implementing the atoms of your language first; parslet takes pride in making this possible.
Eager to try this out? Please see the associated web site: kschiess.github.com/parslet
SYNOPSIS
require 'parslet' include Parslet # parslet parses strings str('foo'). parse('foo') # => "foo"@0 # it matches character sets match['abc'].parse('a') # => "a"@0 match['abc'].parse('b') # => "b"@0 match['abc'].parse('c') # => "c"@0 # and it annotates its output str('foo').as(:important_bit). parse('foo') # => {:important_bit=>"foo"@0} # you can construct parsers with just a few lines quote = str('"') simple_string = quote >> (quote.absent? >> any).repeat >> quote simple_string. parse('"Simple Simple Simple"') # => "\"Simple Simple Simple\""@0 # or by making a fuss about it class Smalltalk < Parslet::Parser root :smalltalk rule(:smalltalk) { statements } rule(:statements) { # insert smalltalk parser here (outside of the scope of this readme) } end # and then Smalltalk.new.parse('smalltalk')
COMPATIBILITY
This library should work with most rubies. I‘ve tested it with MRI 1.8 (except 1.8.6), 1.9, rbx-head, jruby. Please report as a bug if you encounter issues.
Note that due to Ruby 1.8 internals, Unicode parsing is not supported on that version.
On Mac OS X Lion, ruby-1.8.7-p352 has been known to segfault. Use ruby-1.8.7-p334 for better results.
STATUS
Production worthy.
(c) 2010, 2011, 2012 Kaspar Schiess