forked from mirror/go-json
56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package json
|
|
|
|
import (
|
|
"errors"
|
|
"strconv"
|
|
"unsafe"
|
|
)
|
|
|
|
type floatDecoder struct {
|
|
op func(uintptr, float64)
|
|
}
|
|
|
|
func newFloatDecoder(op func(uintptr, float64)) *floatDecoder {
|
|
return &floatDecoder{op: op}
|
|
}
|
|
|
|
func (d *floatDecoder) decodeByte(ctx *context) ([]byte, error) {
|
|
buf := ctx.buf
|
|
cursor := ctx.cursor
|
|
buflen := ctx.buflen
|
|
for ; cursor < buflen; cursor++ {
|
|
switch buf[cursor] {
|
|
case ' ', '\n', '\t', '\r':
|
|
continue
|
|
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
start := cursor
|
|
cursor++
|
|
for ; cursor < buflen; cursor++ {
|
|
tk := int(buf[cursor])
|
|
if (int('0') <= tk && tk <= int('9')) || tk == '.' || tk == 'e' || tk == 'E' {
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
num := ctx.buf[start:cursor]
|
|
ctx.cursor = cursor
|
|
return num, nil
|
|
}
|
|
}
|
|
return nil, errors.New("unexpected error number")
|
|
}
|
|
|
|
func (d *floatDecoder) decode(ctx *context, p uintptr) error {
|
|
bytes, err := d.decodeByte(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s := *(*string)(unsafe.Pointer(&bytes))
|
|
f64, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
d.op(p, f64)
|
|
return nil
|
|
}
|