Class: JsonPath

Inherits:
Object
  • Object
show all
Defined in:
lib/jsonpath.rb,
lib/jsonpath/proxy.rb,
lib/jsonpath/version.rb,
lib/jsonpath/enumerable.rb

Defined Under Namespace

Classes: Enumerable, Proxy

Constant Summary collapse

VERSION = 
'0.4.0'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, opts = nil) ⇒ JsonPath

Returns a new instance of JsonPath.



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# File 'lib/jsonpath.rb', line 10

def initialize(path, opts = nil)
  @opts = opts
  scanner = StringScanner.new(path)
  @path = []
  bracket_count = 0
  while not scanner.eos?
    if token = scanner.scan(/\$/)
      @path << token
    elsif token = scanner.scan(/@/)
      @path << token
    elsif token = scanner.scan(/[a-zA-Z_]+/)
      @path << "['#{token}']"
    elsif token = scanner.scan(/'(.*?)'/)
      @path << "[#{token}]"
    elsif token = scanner.scan(/\[/)
      count = 1
      while !count.zero?
        if t = scanner.scan(/\[/)
          token << t
          count += 1
        elsif t = scanner.scan(/\]/)
          token << t
          count -= 1
        elsif t = scanner.scan(/[^\[\]]*/)
          token << t
        end
      end
      @path << token
    elsif token = scanner.scan(/\.\./)
      @path << token
    elsif scanner.scan(/\./)
    elsif token = scanner.scan(/\*/)
      @path << token
    elsif token = scanner.scan(/./)
      @path.last << token
    end
  end
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/jsonpath.rb', line 8

def path
  @path
end

Class Method Details

.for(obj) ⇒ Object 



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# File 'lib/jsonpath.rb', line 65

def self.for(obj)
  Proxy.new(obj)
end

.on(object, path, opts = nil) ⇒ Object 



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# File 'lib/jsonpath.rb', line 61

def self.on(object, path, opts = nil)
  self.new(path, opts).on(object)
end

Instance Method Details

#enum_on(object) ⇒ Object 



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# File 'lib/jsonpath.rb', line 57

def enum_on(object)
  JsonPath::Enumerable.new(self, object, @opts)
end

#first(object) ⇒ Object 



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# File 'lib/jsonpath.rb', line 53

def first(object)
  enum_on(object).first
end

#on(object) ⇒ Object 



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# File 'lib/jsonpath.rb', line 49

def on(object)
  enum_on(object).to_a
end