Module: Rjq::Path

Defined in:
lib/rjq/path.rb

Class Method Summary collapse

Class Method Details

.assert_path(path) ⇒ Object

Raises:



111
112
113
114
115
 
# File 'lib/rjq/path.rb', line 111

def assert_path(path)
  raise TypeError, 'Path must be specified as an array' unless path.is_a?(Array)

  path
end

.delete(value, path) ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/rjq/path.rb', line 63

def delete(value, path)
  assert_path(path)
  return nil if path.empty?

  parent = get(value, path[0...-1])
  key = path.last
  if slice_component?(key)
    replacement = parent.is_a?(String) ? '' : []
    replace_slice(parent, key, replacement)
    return value
  end
  case parent
  when Array
    raise TypeError, cannot_index_message(parent, key) unless key.is_a?(Numeric)
    return value if key.respond_to?(:finite?) && !key.finite?

    key = key.to_i
    return value if key.zero? && path.last.negative?

    key = parent.length + key if key.negative?
    parent.delete_at(key) unless key.negative?
  when Hash
    raise TypeError, cannot_index_message(parent, key) unless key.is_a?(String)

    parent.delete(key)
  end
  value
end

.get(value, path) ⇒ Object 



7
8
9
10
 
# File 'lib/rjq/path.rb', line 7

def get(value, path)
  assert_path(path)
  path.reduce(value) { |current, key| read_index(current, key) }
end

.paths(value, leaves_only: false) ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/rjq/path.rb', line 92

def paths(value, leaves_only: false)
  out = []
  stack = [[value, nil]]
  until stack.empty?
    current, path_node = stack.pop
    scalar = !(current.is_a?(Array) || current.is_a?(Hash))
    out << materialize_path(path_node) if path_node.nil? || !leaves_only || scalar
    children = if current.is_a?(Array)
                 current.each_with_index.map { |item, index| [item, [path_node, index]] }
               elsif current.is_a?(Hash)
                 current.map { |key, item| [item, [path_node, key]] }
               else
                 []
               end
    stack.concat(children.reverse)
  end
  out
end

.read_index(value, index) ⇒ Object 



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
# File 'lib/rjq/path.rb', line 12

def read_index(value, index)
  return read_slice(value, index) if slice_component?(index)

  case value
  when NilClass
    raise TypeError, cannot_index_message(value, index) unless index.is_a?(String) || index.is_a?(Numeric)

    nil
  when Array
    raise TypeError, cannot_index_message(value, index) unless index.is_a?(Numeric)

    read_array(value, index)
  when Hash
    raise TypeError, cannot_index_message(value, index) unless index.is_a?(String)

    value[index]
  when String
    raise TypeError, cannot_index_message(value, index)
  else
    raise TypeError, cannot_index_message(value, index)
  end
end

.set(value, path, new_value) ⇒ Object 



35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/rjq/path.rb', line 35

def set(value, path, new_value)
  assert_path(path)
  return new_value if path.empty?

  if value.nil?
    read_index(nil, path.first)
    value = container_for(path.first)
  end
  parent = ensure_parent(value, path)
  key = path.last
  if slice_component?(key)
    replace_slice(parent, key, new_value)
    return value
  end
  key = normalize_array_key(parent, key)
  case parent
  when Array
    parent[key] = new_value
  when Hash
    raise TypeError, cannot_index_message(parent, key) unless key.is_a?(String)

    parent[key] = new_value
  else
    raise TypeError, cannot_index_message(parent, key)
  end
  value
end