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INTRODUCTION
Parslet makes developing complex parsers easy. It does so by
* providing the best *error reporting* possible
* *not generating* reams of code for you to debug
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:
http://kschiess.github.com/parslet
SYNOPSIS
require 'parslet'
include Parslet
# Constructs a parser using a Parser Expression Grammar like DSL:
parser = str('"') >>
(
str('\\') >> any |
str('"').absnt? >> any
).repeat.as(:string) >>
str('"')
# Parse the string and capture parts of the interpretation (:string above)
tree = parser.parse(%Q{
"This is a \\"String\\" in which you can escape stuff"
}.strip)
tree # => {:string=>"This is a \\\"String\\\" in which you can escape stuff"}
# Here's how you can grab results from that tree, two methods:
# 1)
Pattern.new(:string => simple(:x)).each_match(tree) do |dictionary|
puts "String contents (method 1): #{dictionary[:x]}"
end
# 2)
transform = Parslet::Transform.new do
rule(:string => simple(:x)) {
puts "String contents (method 2): #{x}" }
end
transform.apply(tree)
COMPATIBILITY
This library should work with both ruby 1.8 and ruby 1.9.
STATUS
On the road to 1.0; improving documentation, packaging and upgrading to rspec2.
(c) 2010 Kaspar Schiess
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