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