$or support

[flimzy]

No description provided.

[codecov-io]

Codecov Report

Merging #19 into master will decrease coverage by 35.92%.
The diff coverage is 68.96%.

@@             Coverage Diff             @@
##           master      #19       +/-   ##
===========================================
- Coverage    87.8%   51.87%   -35.93%     
===========================================
  Files           1        2        +1     
  Lines          82      160       +78     
===========================================
+ Hits           72       83       +11     
- Misses          6       74       +68     
+ Partials        4        3        -1

Impacted Files	Coverage Δ
operators.go	100% <100%> (ø)
mango.go	48.32% <65.71%> (-39.49%)	⬇️

---

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[flimzy]

func foo(node) {
if node == array {
for i, value = range node {
node = foo(node)
}
}
if node == object {
for key, value = range node {
if len(node) == 1 and value != object {
// implicit equal
node = { "$and": { "$eq": value }}
}
if len(node) == 1 and value == object and isOperator(value.key) {
node = { key + '.' + value.key: value.value }
}
if !isOperator(key) {
node = { "$and": foo(convertToArray(node)) }
}
}
}
return node
}

{"foo": "bar"} => {"$and":[{"foo": {"$eq": "bar"}}]}
{"foo":"bar", "baz":"qux"} => {"$and":[{"foo": {"$eq": "bar"}}, {"baz":{"$eq":"qux"}}]}

x OR ( y AND z )

$or: [ x,
$and [y,z]]

• object keys are combination operators, values are arrays, do recursion on arrays
• convert array to selector, only contain objects which are converted to subselectors
• if array-object value is array, its a combination, otherwise, it's a field condition

CombinationNode
- Operator ($and, $or, etc)
- Array of Nodes

oper
{"$and":[{"foo": {"$eq": "bar"}}, {"baz":{"$eq":"qux"}}]}

ComparisonNode
- Operator ($eq, $gt, etc)
- Field name
- Value

field oper value
{"foo": {"$eq": "bar"}}