matterbridge/vendor/github.com/francoispqt/gojay/decode_number_float.go

517 lines
15 KiB
Go

package gojay
// DecodeFloat64 reads the next JSON-encoded value from the decoder's input (io.Reader) and stores it in the float64 pointed to by v.
//
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
func (dec *Decoder) DecodeFloat64(v *float64) error {
if dec.isPooled == 1 {
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
}
return dec.decodeFloat64(v)
}
func (dec *Decoder) decodeFloat64(v *float64) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch c := dec.data[dec.cursor]; c {
case ' ', '\n', '\t', '\r', ',':
continue
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
val, err := dec.getFloat()
if err != nil {
return err
}
*v = val
return nil
case '-':
dec.cursor = dec.cursor + 1
val, err := dec.getFloatNegative()
if err != nil {
return err
}
*v = -val
return nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) decodeFloat64Null(v **float64) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch c := dec.data[dec.cursor]; c {
case ' ', '\n', '\t', '\r', ',':
continue
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
val, err := dec.getFloat()
if err != nil {
return err
}
if *v == nil {
*v = new(float64)
}
**v = val
return nil
case '-':
dec.cursor = dec.cursor + 1
val, err := dec.getFloatNegative()
if err != nil {
return err
}
if *v == nil {
*v = new(float64)
}
**v = -val
return nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) getFloatNegative() (float64, error) {
// look for following numbers
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch dec.data[dec.cursor] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
return dec.getFloat()
default:
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) getFloat() (float64, error) {
var end = dec.cursor
var start = dec.cursor
// look for following numbers
for j := dec.cursor + 1; j < dec.length || dec.read(); j++ {
switch dec.data[j] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
end = j
continue
case '.':
// we get part before decimal as integer
beforeDecimal := dec.atoi64(start, end)
// then we get part after decimal as integer
start = j + 1
// get number after the decimal point
for i := j + 1; i < dec.length || dec.read(); i++ {
c := dec.data[i]
if isDigit(c) {
end = i
// multiply the before decimal point portion by 10 using bitwise
// make sure it doesn't overflow
if end-start < 18 {
beforeDecimal = (beforeDecimal << 3) + (beforeDecimal << 1)
}
continue
} else if (c == 'e' || c == 'E') && j < i-1 {
// we have an exponent, convert first the value we got before the exponent
var afterDecimal int64
expI := end - start + 2
// if exp is too long, it means number is too long, just truncate the number
if expI >= len(pow10uint64) || expI < 0 {
expI = len(pow10uint64) - 2
afterDecimal = dec.atoi64(start, start+expI-2)
} else {
// then we add both integers
// then we divide the number by the power found
afterDecimal = dec.atoi64(start, end)
}
dec.cursor = i + 1
pow := pow10uint64[expI]
floatVal := float64(beforeDecimal+afterDecimal) / float64(pow)
exp, err := dec.getExponent()
if err != nil {
return 0, err
}
pExp := (exp + (exp >> 31)) ^ (exp >> 31) + 1 // absolute exponent
if pExp >= int64(len(pow10uint64)) || pExp < 0 {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
// if exponent is negative
if exp < 0 {
return float64(floatVal) * (1 / float64(pow10uint64[pExp])), nil
}
return float64(floatVal) * float64(pow10uint64[pExp]), nil
}
dec.cursor = i
break
}
if end >= dec.length || end < start {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
var afterDecimal int64
expI := end - start + 2
// if exp is too long, it means number is too long, just truncate the number
if expI >= len(pow10uint64) || expI < 0 {
expI = 19
afterDecimal = dec.atoi64(start, start+expI-2)
} else {
afterDecimal = dec.atoi64(start, end)
}
pow := pow10uint64[expI]
// then we add both integers
// then we divide the number by the power found
return float64(beforeDecimal+afterDecimal) / float64(pow), nil
case 'e', 'E':
dec.cursor = j + 1
// we get part before decimal as integer
beforeDecimal := uint64(dec.atoi64(start, end))
// get exponent
exp, err := dec.getExponent()
if err != nil {
return 0, err
}
pExp := (exp + (exp >> 31)) ^ (exp >> 31) + 1 // abs
if pExp >= int64(len(pow10uint64)) || pExp < 0 {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
// if exponent is negative
if exp < 0 {
return float64(beforeDecimal) * (1 / float64(pow10uint64[pExp])), nil
}
return float64(beforeDecimal) * float64(pow10uint64[pExp]), nil
case ' ', '\n', '\t', '\r', ',', '}', ']': // does not have decimal
dec.cursor = j
return float64(dec.atoi64(start, end)), nil
}
// invalid json we expect numbers, dot (single one), comma, or spaces
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
return float64(dec.atoi64(start, end)), nil
}
// DecodeFloat32 reads the next JSON-encoded value from the decoder's input (io.Reader) and stores it in the float32 pointed to by v.
//
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
func (dec *Decoder) DecodeFloat32(v *float32) error {
if dec.isPooled == 1 {
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
}
return dec.decodeFloat32(v)
}
func (dec *Decoder) decodeFloat32(v *float32) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch c := dec.data[dec.cursor]; c {
case ' ', '\n', '\t', '\r', ',':
continue
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
val, err := dec.getFloat32()
if err != nil {
return err
}
*v = val
return nil
case '-':
dec.cursor = dec.cursor + 1
val, err := dec.getFloat32Negative()
if err != nil {
return err
}
*v = -val
return nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) decodeFloat32Null(v **float32) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch c := dec.data[dec.cursor]; c {
case ' ', '\n', '\t', '\r', ',':
continue
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
val, err := dec.getFloat32()
if err != nil {
return err
}
if *v == nil {
*v = new(float32)
}
**v = val
return nil
case '-':
dec.cursor = dec.cursor + 1
val, err := dec.getFloat32Negative()
if err != nil {
return err
}
if *v == nil {
*v = new(float32)
}
**v = -val
return nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) getFloat32Negative() (float32, error) {
// look for following numbers
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch dec.data[dec.cursor] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
return dec.getFloat32()
default:
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) getFloat32() (float32, error) {
var end = dec.cursor
var start = dec.cursor
// look for following numbers
for j := dec.cursor + 1; j < dec.length || dec.read(); j++ {
switch dec.data[j] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
end = j
continue
case '.':
// we get part before decimal as integer
beforeDecimal := dec.atoi64(start, end)
// then we get part after decimal as integer
start = j + 1
// get number after the decimal point
// multiple the before decimal point portion by 10 using bitwise
for i := j + 1; i < dec.length || dec.read(); i++ {
c := dec.data[i]
if isDigit(c) {
end = i
// multiply the before decimal point portion by 10 using bitwise
// make sure it desn't overflow
if end-start < 9 {
beforeDecimal = (beforeDecimal << 3) + (beforeDecimal << 1)
}
continue
} else if (c == 'e' || c == 'E') && j < i-1 {
// we get the number before decimal
var afterDecimal int64
expI := end - start + 2
// if exp is too long, it means number is too long, just truncate the number
if expI >= 12 || expI < 0 {
expI = 10
afterDecimal = dec.atoi64(start, start+expI-2)
} else {
afterDecimal = dec.atoi64(start, end)
}
dec.cursor = i + 1
pow := pow10uint64[expI]
// then we add both integers
// then we divide the number by the power found
floatVal := float32(beforeDecimal+afterDecimal) / float32(pow)
exp, err := dec.getExponent()
if err != nil {
return 0, err
}
pExp := (exp + (exp >> 31)) ^ (exp >> 31) + 1 // abs
if pExp >= int64(len(pow10uint64)) || pExp < 0 {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
// if exponent is negative
if exp < 0 {
return float32(floatVal) * (1 / float32(pow10uint64[pExp])), nil
}
return float32(floatVal) * float32(pow10uint64[pExp]), nil
}
dec.cursor = i
break
}
if end >= dec.length || end < start {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
// then we add both integers
// then we divide the number by the power found
var afterDecimal int64
expI := end - start + 2
// if exp is too long, it means number is too long, just truncate the number
if expI >= 12 || expI < 0 {
expI = 10
afterDecimal = dec.atoi64(start, start+expI-2)
} else {
// then we add both integers
// then we divide the number by the power found
afterDecimal = dec.atoi64(start, end)
}
pow := pow10uint64[expI]
return float32(beforeDecimal+afterDecimal) / float32(pow), nil
case 'e', 'E':
dec.cursor = j + 1
// we get part before decimal as integer
beforeDecimal := dec.atoi64(start, end)
// get exponent
exp, err := dec.getExponent()
if err != nil {
return 0, err
}
pExp := (exp + (exp >> 31)) ^ (exp >> 31) + 1
if pExp >= int64(len(pow10uint64)) || pExp < 0 {
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
// if exponent is negative
if exp < 0 {
return float32(beforeDecimal) * (1 / float32(pow10uint64[pExp])), nil
}
return float32(beforeDecimal) * float32(pow10uint64[pExp]), nil
case ' ', '\n', '\t', '\r', ',', '}', ']': // does not have decimal
dec.cursor = j
return float32(dec.atoi64(start, end)), nil
}
// invalid json we expect numbers, dot (single one), comma, or spaces
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
return float32(dec.atoi64(start, end)), nil
}
// Add Values functions
// AddFloat decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) AddFloat(v *float64) error {
return dec.Float64(v)
}
// AddFloatNull decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
// If a `null` is encountered, gojay does not change the value of the pointer.
func (dec *Decoder) AddFloatNull(v **float64) error {
return dec.Float64Null(v)
}
// AddFloat64 decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) AddFloat64(v *float64) error {
return dec.Float64(v)
}
// AddFloat64Null decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
// If a `null` is encountered, gojay does not change the value of the pointer.
func (dec *Decoder) AddFloat64Null(v **float64) error {
return dec.Float64Null(v)
}
// AddFloat32 decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) AddFloat32(v *float32) error {
return dec.Float32(v)
}
// AddFloat32Null decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
// If a `null` is encountered, gojay does not change the value of the pointer.
func (dec *Decoder) AddFloat32Null(v **float32) error {
return dec.Float32Null(v)
}
// Float decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) Float(v *float64) error {
return dec.Float64(v)
}
// FloatNull decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) FloatNull(v **float64) error {
return dec.Float64Null(v)
}
// Float64 decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) Float64(v *float64) error {
err := dec.decodeFloat64(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}
// Float64Null decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) Float64Null(v **float64) error {
err := dec.decodeFloat64Null(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}
// Float32 decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) Float32(v *float32) error {
err := dec.decodeFloat32(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}
// Float32Null decodes the JSON value within an object or an array to a *float64.
// If next key value overflows float64, an InvalidUnmarshalError error will be returned.
func (dec *Decoder) Float32Null(v **float32) error {
err := dec.decodeFloat32Null(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}