Class: Serega::SeregaPlugins::StringModifiers::ParseStringModifiers

Inherits:
Object
  • Object
show all
Defined in:
lib/serega/plugins/string_modifiers/parse_string_modifiers.rb

Overview

Modifiers parser

Class Method Summary collapse

Class Method Details

.parse(fields) ⇒ Hash

Parses string modifiers

Examples:

parse("user") => { user: {} }
parse("user(id)") => { user: { id: {} } }
parse("user(id,name)") => { user: { id: {}, name: {} } }
parse("user,comments") => { user: {}, comments: {} }
parse("user(comments(text))") => { user: { comments: { text: {} } } }

Parameters:

  • fields (String)

Returns:

  • (Hash) —

    parsed modifiers in form of nested hash



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# File 'lib/serega/plugins/string_modifiers/parse_string_modifiers.rb', line 42

def parse(fields)
  res = {}
  attribute = +""
  char = +""
  path_stack = nil
  fields = StringIO.new(fields)

  while fields.read(1, char)
    case char
    when ","
      add_attribute(res, path_stack, attribute, FROZEN_EMPTY_HASH)
    when ")"
      add_attribute(res, path_stack, attribute, FROZEN_EMPTY_HASH)
      path_stack&.pop
    when "("
      name = add_attribute(res, path_stack, attribute, {})
      (path_stack ||= []).push(name) if name
    else
      attribute.insert(-1, char)
    end
  end

  add_attribute(res, path_stack, attribute, FROZEN_EMPTY_HASH)

  res
end