Querylet

Variables

{my_variable}

Partials

'link.to.path' param='{{testing}'}}

Partial blocks

{{#array} {/array}

If Else

variable} {else} {/end}

Parslet

https://www.youtube.com/watch?time_continue=873&v=ET_POMJNWNs&feature=emb_title https://kschiess.github.io/parslet/parser.html https://www.rubydoc.info/github/kschiess/parslet/Parslet/Atoms/Scope

https://www.rubydoc.info/github/kschiess/parslet/Parslet/Atoms/Capture

Extra input after last repetition

https://stackoverflow.com/questions/27095141/how-do-i-get-my-parser-atom-to-terminate-inside-a-rule-including-optional-spaces

Parset Slice

str('Boston').parse('Boston') #=> "Boston"@0

The @0 is the offset

https://www.sitepoint.com/parsing-parslet-gem/

Parset Debugging

If the parser.rb runs into errors you can add the following to help debug what is happening

require 'parslet/convenience'
parser.parse_with_debug(input)

How it works:

• parser.rb — Create a grammar: What should be legal syntax?
• transform.rb — Annotate the grammar: What is important data?
• tree.rb - Create a transformation: How do I want to work with that data?

Parser

Parslet parsers output deep nested hashes.

To see all the define rules check out parser_helper.rb

rspec spec/parser_helper.rb

Transform

You capture patterns in your deep nested hash and the pass to a tree

Tree

The tree does something with your captured patterns