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345 lines
8.5 KiB
345 lines
8.5 KiB
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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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 < len(iter.buf) && 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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