98 lines
2.6 KiB
CoffeeScript
98 lines
2.6 KiB
CoffeeScript
common = require './common'
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test = (obj, query) ->
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for k,v of query
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if k.charAt(0) == '$' # this is a logical operator
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res = testExpressions(obj, v, k)
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else
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value = common.getParamValueFromPath(obj, k)
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if common.typeOf(v) isnt common.OBJECT_TYPE
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# TODO comparing array to regex, array to array, and object to object
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if common.typeOf(value) is common.ARRAY_TYPE
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res = value.indexOf(v) != -1
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else
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if common.typeOf(v) is common.REGEXP_TYPE
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res = v.test(value)
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else
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res = v == value
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else
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for k2,v2 of v
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switch k2
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when '$ne'
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if common.typeOf(value) is common.ARRAY_TYPE
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res = value.indexOf(v2) == -1
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else
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res = value != v2
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when '$lt'
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res = value < v2
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when '$lte'
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res = value <= v2
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when '$gt'
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res = value > v2
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when '$gte'
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res = value >= v2
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when '$regex'
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res = v2.test(value)
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when '$in'
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throw new Error('Operator not supported')
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when '$nin'
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throw new Error('Operator not supported')
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when '$all'
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throw new Error('Operator not supported')
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when '$exists'
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throw new Error('Operator not supported')
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else
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throw new Error('Operator not supported')
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if not res
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return false
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return true
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testExpressions = (obj, expressions, lop) ->
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for f in expressions
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res = test(obj, f)
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switch lop
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when '$and'
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return false if not res
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when '$or'
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return true if res
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when '$nor'
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return false if res
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return switch lop
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when '$and' then true
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when '$or' then false
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when '$nor' then true
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else throw new Error('Unknown logical operator')
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# generate field projection from a query
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projection = (query, proj) ->
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for k,v of query
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if k.charAt(0) == '$' # this is a logical operator
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for q in v
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projection(q, proj)
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else
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proj[k] = 1
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# optimize projection by removing overlaps
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optimizeProjection = (obj) ->
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keys = Object.keys(obj).sort()
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return if keys.length <= 1
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for i in [1 ... keys.length]
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a = keys[i-1]
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b = keys[i]
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if common.startsWith(b, a)
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if b.charAt(a.length) == '.' or b.charAt(a.length - 1) == '.'
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delete obj[b]
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exports.test = test
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exports.projection = projection
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exports.optimizeProjection = optimizeProjection
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