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82 lines
2.2 KiB
82 lines
2.2 KiB
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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// +build !go1.9
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package bson // import "go.mongodb.org/mongo-driver/bson"
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import (
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"math"
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"strconv"
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"strings"
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)
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// Zeroer allows custom struct types to implement a report of zero
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// state. All struct types that don't implement Zeroer or where IsZero
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// returns false are considered to be not zero.
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type Zeroer interface {
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IsZero() bool
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}
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// D is an ordered representation of a BSON document. This type should be used when the order of the elements matters,
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// such as MongoDB command documents. If the order of the elements does not matter, an M should be used instead.
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//
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// Example usage:
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//
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// bson.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}}
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type D []E
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// Map creates a map from the elements of the D.
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func (d D) Map() M {
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m := make(M, len(d))
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for _, e := range d {
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m[e.Key] = e.Value
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}
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return m
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}
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// E represents a BSON element for a D. It is usually used inside a D.
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type E struct {
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Key string
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Value interface{}
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}
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// M is an unordered representation of a BSON document. This type should be used when the order of the elements does not
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// matter. This type is handled as a regular map[string]interface{} when encoding and decoding. Elements will be
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// serialized in an undefined, random order. If the order of the elements matters, a D should be used instead.
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//
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// Example usage:
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//
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// bson.M{"foo": "bar", "hello": "world", "pi": 3.14159}
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type M map[string]interface{}
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// An A is an ordered representation of a BSON array.
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//
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// Example usage:
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//
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// bson.A{"bar", "world", 3.14159, bson.D{{"qux", 12345}}}
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type A []interface{}
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func formatDouble(f float64) string {
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var s string
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if math.IsInf(f, 1) {
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s = "Infinity"
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} else if math.IsInf(f, -1) {
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s = "-Infinity"
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} else if math.IsNaN(f) {
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s = "NaN"
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} else {
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// Print exactly one decimalType place for integers; otherwise, print as many are necessary to
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// perfectly represent it.
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s = strconv.FormatFloat(f, 'G', -1, 64)
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if !strings.ContainsRune(s, '.') {
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s += ".0"
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}
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}
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return s
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}
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