Module: Siren

Defined in:
lib/siren/parser.rb,
lib/siren.rb,
lib/siren/json.rb,
lib/siren/node.rb,
lib/siren/walker.rb,
lib/siren/reference.rb,
lib/siren/json_query.rb,
lib/siren/json_query_nodes.rb

Overview

Based on www.json.org/json_parse.js (public domain)

Defined Under Namespace

Modules: Json, JsonQuery, Node, Walker Classes: JsonParser, JsonQueryParser, Parser, Reference

Constant Summary collapse

VERSION = 
'0.2.0'
TYPE_FIELD = 
"type"
ID_FIELD = 
"id"
REF_FIELD = 
"$ref"

Class Method Summary collapse

Class Method Details

.compile_query(expression) ⇒ Object 



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# File 'lib/siren.rb', line 70

def self.compile_query(expression)
  @query_parser ||= JsonQueryParser.new
  @query_cache  ||= {}
  @query_cache[expression] ||= @query_parser.parse(expression)
end

.each(object, &block) ⇒ Object 



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# File 'lib/siren.rb', line 23

def self.each(object, &block)
  case object
  when Array      then object.each_with_index { |x,i| yield(i,x) }
  when Hash       then object.each { |k,v| yield(k,v) }
  when Enumerable then each(object.to_a, &block)
  else nil
  end
end

.parse(string, &block) ⇒ Object 



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# File 'lib/siren.rb', line 32

def self.parse(string, &block)
  @json_parser ||= JsonParser.new
  Reference.flush!
  @symbols = {}
  
  result = @json_parser.parse(string).value rescue nil
  
  @json_parser.walk(result) do |holder, key, value|
    if Hash === value && value[REF_FIELD]
      value = Reference.new(value)
      value.on(:resolve) do |ref, root, symbols|
        holder[key] = ref.find(root, symbols, holder)
      end
    end
    value
  end
  
  @json_parser.walk(result) do |holder, key, value|
    if Hash === value
      id = value[ID_FIELD]
      value = Node.from_json(value)
      @symbols[id] = value
    end
    value
  end
  
  result = Node.from_json(result)
  
  Reference.resolve!(result, @symbols)
  @json_parser.walk(result, &block) if block_given?
  
  result
end

.query(expression, root) ⇒ Object 



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# File 'lib/siren.rb', line 66

def self.query(expression, root)
  compile_query(expression).value(root, @symbols || {})
end