Class: JSONSelect

Inherits:

Object

• Object
• JSONSelect

show all

Defined in:

lib/json_select.rb,
lib/json_select/version.rb,
lib/json_select/selector.rb

Defined Under Namespace

Modules: Ast, Selector Classes: SelectorParser

Constant Summary

ParseError =

Class.new(RuntimeError)

VERSION =

"0.1.2"

@@parser_cache =

{}

Instance Attribute Summary (collapse)

• - (Object) ast readonly

  Returns the value of attribute ast.

Class Method Summary (collapse)

• + (Object) reset_cache!

Instance Method Summary (collapse)

• - (JSONSelect) initialize(src, use_parser_cache = true) constructor

  A new instance of JSONSelect.

• - (Object) match(object) (also: #=~)

  Returns the first matching child in `object`.

• - (Object) matches(object)

  Returns all matching children in `object`.

• - (Object) test(object) (also: #===)

  Returns true if `object` has any matching children.

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# File 'lib/json_select/selector.rb', line 11

def initialize(src, use_parser_cache=true)
  case src

  when String
    ast = nil

    if use_parser_cache
      ast = @@parser_cache[src]
    end

    if ast
      @ast = ast

    else
      parser = JSONSelect::SelectorParser.new
      tree   = parser.parse(src)
      unless tree
        raise JSONSelect::ParseError, parser.failure_reason
      end

      @ast = tree.to_ast

      if use_parser_cache
        @@parser_cache[src] = ast
      end
    end

  when Array
    @ast = src

  else
    raise ArgumentError, "Expected a string for ast"

  end
end

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# File 'lib/json_select/selector.rb', line 3

def ast
  @ast
end

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# File 'lib/json_select/selector.rb', line 7

def self.reset_cache!
  @@parser_cache.clear
end

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# File 'lib/json_select/selector.rb', line 48

def match(object)
  _each(@ast, object, nil, nil, nil, 0) do |object|
    return object
  end

  return nil
end

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# File 'lib/json_select/selector.rb', line 59

def matches(object)
  matches = []

  _each(@ast, object, nil, nil, nil, 0) do |object|
    matches << object
  end

  matches
end

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# File 'lib/json_select/selector.rb', line 70

def test(object)
  _each(@ast, object, nil, nil, nil, 0) do |object|
    return true
  end

  return false
end