| // 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 ( |
| "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 represents a BSON Document. This type can be used to represent BSON in a concise and readable |
| // manner. It should generally be used when serializing to BSON. For deserializing, the Raw or |
| // Document types should be used. |
| // |
| // Example usage: |
| // |
| // primitive.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}} |
| // |
| // This type should be used in situations where order matters, such as MongoDB commands. If the |
| // order is not important, a map is more comfortable and concise. |
| 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, concise representation of a BSON Document. It should generally be used to |
| // serialize BSON when the order of the elements of a BSON document do not matter. If the element |
| // order matters, use a D instead. |
| // |
| // Example usage: |
| // |
| // primitive.M{"foo": "bar", "hello": "world", "pi": 3.14159} |
| // |
| // This type is handled in the encoders as a regular map[string]interface{}. The elements will be |
| // serialized in an undefined, random order, and the order will be different each time. |
| type M map[string]interface{} |
| |
| // An A represents a BSON array. This type can be used to represent a BSON array in a concise and |
| // readable manner. It should generally be used when serializing to BSON. For deserializing, the |
| // RawArray or Array types should be used. |
| // |
| // Example usage: |
| // |
| // primitive.A{"bar", "world", 3.14159, primitive.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 |
| } |