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48 lines
2.2 KiB
CoffeeScript
48 lines
2.2 KiB
CoffeeScript
LocalMongo = module.exports
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# Checks whether func(l, r) is true for at least one value of left for at least one value of right
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mapred = (left, right, func) ->
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_.reduce(left, ((result, singleLeft) ->
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result or (_.reduce (_.map right, (singleRight) -> func(singleLeft, singleRight)),
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((intermediate, value) -> intermediate or value), false)), false)
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doQuerySelector = (value, operatorObj) ->
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value = [value] unless _.isArray value # left hand can be an array too
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for operator, body of operatorObj
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body = [body] unless _.isArray body # right hand can be an array too
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switch operator
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when '$gt' then return false unless mapred value, body, (l, r) -> l > r
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when '$gte' then return false unless mapred value, body, (l, r) -> l >= r
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when '$lt' then return false unless mapred value, body, (l, r) -> l < r
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when '$lte' then return false unless mapred value, body, (l, r) -> l <= r
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when '$ne' then return false if mapred value, body, (l, r) -> l == r
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when '$in' then return false unless _.reduce value, ((result, val) -> result or val in body), false
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when '$nin' then return false if _.reduce value, ((result, val) -> result or val in body), false
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when '$exists' then return false if value[0]? isnt body[0]
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else return false
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true
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matchesQuery = (target, queryObj) ->
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return true unless queryObj
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throw new Error 'Expected an object to match a query against, instead got null' unless target
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for prop, query of queryObj
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if prop[0] == '$'
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switch prop
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when '$or' then return false unless _.reduce query, ((res, obj) -> res or matchesQuery target, obj), false
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when '$and' then return false unless _.reduce query, ((res, obj) -> res and matchesQuery target, obj), true
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else return false
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else
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# Do nested properties
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pieces = prop.split('.')
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obj = target
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for piece in pieces
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unless piece of obj
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obj = null
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break
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obj = obj[piece]
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if typeof query != 'object' or _.isArray query
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return false unless obj == query or (query in obj if _.isArray obj)
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else return false unless doQuerySelector obj, query
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true
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LocalMongo.matchesQuery = matchesQuery
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