Path: | lib/parslet/parser.rb |
Last Update: | Fri Jul 15 14:35:39 -0400 2016 |
The base class for all your parsers. Use as follows:
require 'parslet' class MyParser < Parslet::Parser rule(:a) { str('a').repeat } root(:a) end pp MyParser.new.parse('aaaa') # => 'aaaa' pp MyParser.new.parse('bbbb') # => Parslet::Atoms::ParseFailed: # Don't know what to do with bbbb at line 1 char 1.
Parslet::Parser is also a grammar atom. This means that you can mix full fledged parsers freely with small parts of a different parser.
Example:
class ParserA < Parslet::Parser root :aaa rule(:aaa) { str('a').repeat(3,3) } end class ParserB < Parslet::Parser root :expression rule(:expression) { str('b') >> ParserA.new >> str('b') } end
In the above example, ParserB would parse something like ‘baaab’.