parslet is a Parsing Expression Grammar based[1] parser generator
library. Uff. Now that is out of our system, here goes what it really
does: It makes writing parsers pleasant for the rest of us. No code
generation, clear access to data, unit testable.
- http://kschiess.github.com/parslet/index.html
- GitHub - kschiess/parslet: A small PEG based parser library. See the Hacking page in the Wiki as well.
Installation:
gem install parslet
Changes:
-
All parsers are now parser atoms as well. Not only can you freely
combine atoms, you can mix in parsers! Example:str(‘ip:’) >> IpParser.new >> str(‘;’)
-
Parslet now returns slices instead of strings. Slices are strings
that retain original source offsets and are printed as “string”@0.
This allows line and column information to be accessed in later
stages: See Parslet::Slice for details. -
#prsnt? and #absnt? are now deprecated. Please use only #present? and
#absent
Synopsis:
require ‘parslet’
class Mini < Parslet::Parser
rule(:integer) { match(‘[0-9]’).repeat(1) }
root(:integer)
end
Mini.new.parse(“132432”) # => “132432”@0
Go wild. Write that compiler!
