Source file src/github.com/aws/smithy-go/encoding/encoding.go

Documentation: github.com/aws/smithy-go/encoding

     1  package encoding
     2  
     3  import (
     4  	"fmt"
     5  	"math"
     6  	"strconv"
     7  )
     8  
     9  // EncodeFloat encodes a float value as per the stdlib encoder for json and xml protocol
    10  // This encodes a float value into dst while attempting to conform to ES6 ToString for Numbers
    11  //
    12  // Based on encoding/json floatEncoder from the Go Standard Library
    13  // https://golang.org/src/encoding/json/encode.go
    14  func EncodeFloat(dst []byte, v float64, bits int) []byte {
    15  	if math.IsInf(v, 0) || math.IsNaN(v) {
    16  		panic(fmt.Sprintf("invalid float value: %s", strconv.FormatFloat(v, 'g', -1, bits)))
    17  	}
    18  
    19  	abs := math.Abs(v)
    20  	fmt := byte('f')
    21  
    22  	if abs != 0 {
    23  		if bits == 64 && (abs < 1e-6 || abs >= 1e21) || bits == 32 && (float32(abs) < 1e-6 || float32(abs) >= 1e21) {
    24  			fmt = 'e'
    25  		}
    26  	}
    27  
    28  	dst = strconv.AppendFloat(dst, v, fmt, -1, bits)
    29  
    30  	if fmt == 'e' {
    31  		// clean up e-09 to e-9
    32  		n := len(dst)
    33  		if n >= 4 && dst[n-4] == 'e' && dst[n-3] == '-' && dst[n-2] == '0' {
    34  			dst[n-2] = dst[n-1]
    35  			dst = dst[:n-1]
    36  		}
    37  	}
    38  
    39  	return dst
    40  }
    41  

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