347 lines
8.6 KiB
Go
347 lines
8.6 KiB
Go
package jsoniter
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import (
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"math"
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"strconv"
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)
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var intDigits []int8
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const uint32SafeToMultiply10 = uint32(0xffffffff)/10 - 1
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const uint64SafeToMultiple10 = uint64(0xffffffffffffffff)/10 - 1
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const maxFloat64 = 1<<53 - 1
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func init() {
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intDigits = make([]int8, 256)
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for i := 0; i < len(intDigits); i++ {
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intDigits[i] = invalidCharForNumber
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}
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for i := int8('0'); i <= int8('9'); i++ {
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intDigits[i] = i - int8('0')
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}
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}
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// ReadUint read uint
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func (iter *Iterator) ReadUint() uint {
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if strconv.IntSize == 32 {
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return uint(iter.ReadUint32())
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}
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return uint(iter.ReadUint64())
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}
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// ReadInt read int
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func (iter *Iterator) ReadInt() int {
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if strconv.IntSize == 32 {
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return int(iter.ReadInt32())
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}
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return int(iter.ReadInt64())
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}
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// ReadInt8 read int8
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func (iter *Iterator) ReadInt8() (ret int8) {
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c := iter.nextToken()
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if c == '-' {
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val := iter.readUint32(iter.readByte())
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if val > math.MaxInt8+1 {
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iter.ReportError("ReadInt8", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return -int8(val)
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}
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val := iter.readUint32(c)
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if val > math.MaxInt8 {
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iter.ReportError("ReadInt8", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return int8(val)
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}
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// ReadUint8 read uint8
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func (iter *Iterator) ReadUint8() (ret uint8) {
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val := iter.readUint32(iter.nextToken())
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if val > math.MaxUint8 {
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iter.ReportError("ReadUint8", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return uint8(val)
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}
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// ReadInt16 read int16
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func (iter *Iterator) ReadInt16() (ret int16) {
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c := iter.nextToken()
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if c == '-' {
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val := iter.readUint32(iter.readByte())
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if val > math.MaxInt16+1 {
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iter.ReportError("ReadInt16", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return -int16(val)
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}
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val := iter.readUint32(c)
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if val > math.MaxInt16 {
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iter.ReportError("ReadInt16", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return int16(val)
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}
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// ReadUint16 read uint16
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func (iter *Iterator) ReadUint16() (ret uint16) {
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val := iter.readUint32(iter.nextToken())
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if val > math.MaxUint16 {
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iter.ReportError("ReadUint16", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return uint16(val)
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}
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// ReadInt32 read int32
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func (iter *Iterator) ReadInt32() (ret int32) {
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c := iter.nextToken()
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if c == '-' {
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val := iter.readUint32(iter.readByte())
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if val > math.MaxInt32+1 {
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iter.ReportError("ReadInt32", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return -int32(val)
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}
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val := iter.readUint32(c)
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if val > math.MaxInt32 {
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iter.ReportError("ReadInt32", "overflow: "+strconv.FormatInt(int64(val), 10))
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return
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}
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return int32(val)
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}
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// ReadUint32 read uint32
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func (iter *Iterator) ReadUint32() (ret uint32) {
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return iter.readUint32(iter.nextToken())
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}
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func (iter *Iterator) readUint32(c byte) (ret uint32) {
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ind := intDigits[c]
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if ind == 0 {
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iter.assertInteger()
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return 0 // single zero
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}
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if ind == invalidCharForNumber {
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iter.ReportError("readUint32", "unexpected character: "+string([]byte{byte(ind)}))
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return
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}
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value := uint32(ind)
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if iter.tail-iter.head > 10 {
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i := iter.head
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ind2 := intDigits[iter.buf[i]]
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if ind2 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value
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}
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i++
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ind3 := intDigits[iter.buf[i]]
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if ind3 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*10 + uint32(ind2)
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}
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//iter.head = i + 1
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//value = value * 100 + uint32(ind2) * 10 + uint32(ind3)
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i++
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ind4 := intDigits[iter.buf[i]]
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if ind4 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*100 + uint32(ind2)*10 + uint32(ind3)
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}
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i++
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ind5 := intDigits[iter.buf[i]]
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if ind5 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*1000 + uint32(ind2)*100 + uint32(ind3)*10 + uint32(ind4)
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}
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i++
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ind6 := intDigits[iter.buf[i]]
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if ind6 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*10000 + uint32(ind2)*1000 + uint32(ind3)*100 + uint32(ind4)*10 + uint32(ind5)
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}
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i++
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ind7 := intDigits[iter.buf[i]]
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if ind7 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*100000 + uint32(ind2)*10000 + uint32(ind3)*1000 + uint32(ind4)*100 + uint32(ind5)*10 + uint32(ind6)
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}
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i++
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ind8 := intDigits[iter.buf[i]]
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if ind8 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*1000000 + uint32(ind2)*100000 + uint32(ind3)*10000 + uint32(ind4)*1000 + uint32(ind5)*100 + uint32(ind6)*10 + uint32(ind7)
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}
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i++
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ind9 := intDigits[iter.buf[i]]
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value = value*10000000 + uint32(ind2)*1000000 + uint32(ind3)*100000 + uint32(ind4)*10000 + uint32(ind5)*1000 + uint32(ind6)*100 + uint32(ind7)*10 + uint32(ind8)
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iter.head = i
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if ind9 == invalidCharForNumber {
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iter.assertInteger()
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return value
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}
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}
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for {
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for i := iter.head; i < iter.tail; i++ {
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ind = intDigits[iter.buf[i]]
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if ind == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value
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}
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if value > uint32SafeToMultiply10 {
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value2 := (value << 3) + (value << 1) + uint32(ind)
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if value2 < value {
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iter.ReportError("readUint32", "overflow")
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return
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}
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value = value2
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continue
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}
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value = (value << 3) + (value << 1) + uint32(ind)
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}
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if !iter.loadMore() {
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iter.assertInteger()
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return value
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}
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}
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}
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// ReadInt64 read int64
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func (iter *Iterator) ReadInt64() (ret int64) {
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c := iter.nextToken()
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if c == '-' {
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val := iter.readUint64(iter.readByte())
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if val > math.MaxInt64+1 {
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iter.ReportError("ReadInt64", "overflow: "+strconv.FormatUint(uint64(val), 10))
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return
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}
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return -int64(val)
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}
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val := iter.readUint64(c)
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if val > math.MaxInt64 {
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iter.ReportError("ReadInt64", "overflow: "+strconv.FormatUint(uint64(val), 10))
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return
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}
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return int64(val)
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}
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// ReadUint64 read uint64
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func (iter *Iterator) ReadUint64() uint64 {
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return iter.readUint64(iter.nextToken())
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}
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func (iter *Iterator) readUint64(c byte) (ret uint64) {
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ind := intDigits[c]
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if ind == 0 {
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iter.assertInteger()
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return 0 // single zero
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}
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if ind == invalidCharForNumber {
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iter.ReportError("readUint64", "unexpected character: "+string([]byte{byte(ind)}))
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return
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}
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value := uint64(ind)
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if iter.tail-iter.head > 10 {
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i := iter.head
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ind2 := intDigits[iter.buf[i]]
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if ind2 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value
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}
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i++
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ind3 := intDigits[iter.buf[i]]
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if ind3 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*10 + uint64(ind2)
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}
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//iter.head = i + 1
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//value = value * 100 + uint32(ind2) * 10 + uint32(ind3)
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i++
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ind4 := intDigits[iter.buf[i]]
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if ind4 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*100 + uint64(ind2)*10 + uint64(ind3)
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}
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i++
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ind5 := intDigits[iter.buf[i]]
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if ind5 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*1000 + uint64(ind2)*100 + uint64(ind3)*10 + uint64(ind4)
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}
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i++
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ind6 := intDigits[iter.buf[i]]
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if ind6 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*10000 + uint64(ind2)*1000 + uint64(ind3)*100 + uint64(ind4)*10 + uint64(ind5)
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}
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i++
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ind7 := intDigits[iter.buf[i]]
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if ind7 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*100000 + uint64(ind2)*10000 + uint64(ind3)*1000 + uint64(ind4)*100 + uint64(ind5)*10 + uint64(ind6)
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}
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i++
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ind8 := intDigits[iter.buf[i]]
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if ind8 == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value*1000000 + uint64(ind2)*100000 + uint64(ind3)*10000 + uint64(ind4)*1000 + uint64(ind5)*100 + uint64(ind6)*10 + uint64(ind7)
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}
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i++
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ind9 := intDigits[iter.buf[i]]
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value = value*10000000 + uint64(ind2)*1000000 + uint64(ind3)*100000 + uint64(ind4)*10000 + uint64(ind5)*1000 + uint64(ind6)*100 + uint64(ind7)*10 + uint64(ind8)
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iter.head = i
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if ind9 == invalidCharForNumber {
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iter.assertInteger()
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return value
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}
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}
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for {
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for i := iter.head; i < iter.tail; i++ {
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ind = intDigits[iter.buf[i]]
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if ind == invalidCharForNumber {
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iter.head = i
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iter.assertInteger()
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return value
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}
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if value > uint64SafeToMultiple10 {
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value2 := (value << 3) + (value << 1) + uint64(ind)
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if value2 < value {
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iter.ReportError("readUint64", "overflow")
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return
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}
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value = value2
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continue
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}
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value = (value << 3) + (value << 1) + uint64(ind)
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}
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if !iter.loadMore() {
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iter.assertInteger()
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return value
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}
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}
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}
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func (iter *Iterator) assertInteger() {
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if iter.head < iter.tail && iter.buf[iter.head] == '.' {
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iter.ReportError("assertInteger", "can not decode float as int")
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}
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}
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