java/src/main/java/com/jsoniter/NumberReader.java at master · androiddream/java · GitHub

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package com.jsoniter;

import java.io.IOException;

class NumberReader {

final static int[] digits = new int[256];

static {

for (int i = 0; i < digits.length; i++) {

digits[i] = -1;

}

for (int i = '0'; i <= '9'; ++i) {

digits[i] = (i - '0');

}

for (int i = 'a'; i <= 'f'; ++i) {

digits[i] = ((i - 'a') + 10);

}

for (int i = 'A'; i <= 'F'; ++i) {

digits[i] = ((i - 'A') + 10);

}

public static final double readDouble(Jsoniter iter) throws IOException {

final byte c = iter.nextToken();

// when re-read using slowpath, it should include the first byte

iter.unreadByte();

if (c == '-') {

// skip '-' by + 1

return readNegativeDouble(iter, iter.head + 1);

}

return readPositiveDouble(iter, iter.head);

}

private static final double readPositiveDouble(Jsoniter iter, int start) throws IOException {

long value = 0;

byte c = ' ';

int i = start;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value;

}

if (c == '.') break;

final int ind = digits[c];

value = (value << 3) + (value << 1) + ind;

if (ind < 0 || ind > 9) {

return readDoubleSlowPath(iter);

}

if (c == '.') {

i++;

long div = 1;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value / (double) div;

}

final int ind = digits[c];

div = (div << 3) + (div << 1);

value = (value << 3) + (value << 1) + ind;

if (ind < 0 || ind > 9) {

return readDoubleSlowPath(iter);

}

return readDoubleSlowPath(iter);

}

private static final double readNegativeDouble(Jsoniter iter, int start) throws IOException {

long value = 0;

byte c = ' ';

int i = start;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value;

}

if (c == '.') break;

final int ind = digits[c];

value = (value << 3) + (value << 1) - ind;

if (ind < 0 || ind > 9) {

return readDoubleSlowPath(iter);

}

if (c == '.') {

i++;

long div = 1;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value / (double) div;

}

final int ind = digits[c];

div = (div << 3) + (div << 1);

value = (value << 3) + (value << 1) - ind;

if (ind < 0 || ind > 9) {

return readDoubleSlowPath(iter);

}

return readDoubleSlowPath(iter);

}

public static final double readDoubleSlowPath(Jsoniter iter) throws IOException {

return Double.valueOf(readNumber(iter));

}

public static final float readFloat(Jsoniter iter) throws IOException {

final byte c = iter.nextToken();

// when re-read using slowpath, it should include the first byte

iter.unreadByte();

if (c == '-') {

// skip '-' by + 1

return readNegativeFloat(iter, iter.head + 1);

}

return readPositiveFloat(iter, iter.head);

}

private static final float readPositiveFloat(Jsoniter iter, int start) throws IOException {

long value = 0;

byte c = ' ';

int i = start;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value;

}

if (c == '.') break;

final int ind = digits[c];

value = (value << 3) + (value << 1) + ind;

if (ind < 0 || ind > 9) {

return readFloatSlowPath(iter);

}

if (c == '.') {

i++;

long div = 1;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value / (float) div;

}

final int ind = digits[c];

div = (div << 3) + (div << 1);

value = (value << 3) + (value << 1) + ind;

if (ind < 0 || ind > 9) {

return readFloatSlowPath(iter);

}

return readFloatSlowPath(iter);

}

private static final float readNegativeFloat(Jsoniter iter, int start) throws IOException {

long value = 0;

byte c = ' ';

int i = start;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value;

}

if (c == '.') break;

final int ind = digits[c];

value = (value << 3) + (value << 1) - ind;

if (ind < 0 || ind > 9) {

return readFloatSlowPath(iter);

}

if (c == '.') {

i++;

long div = 1;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == ',' || c == '}' || c == ']' || c == ' ') {

iter.head = i;

return value / (float) div;

}

final int ind = digits[c];

div = (div << 3) + (div << 1);

value = (value << 3) + (value << 1) - ind;

if (ind < 0 || ind > 9) {

return readFloatSlowPath(iter);

}

return readFloatSlowPath(iter);

}

public static final float readFloatSlowPath(Jsoniter iter) throws IOException {

return Float.valueOf(readNumber(iter));

}

public static final String readNumber(Jsoniter iter) throws IOException {

int j = 0;

for (byte c = iter.nextToken(); !iter.eof; c = iter.readByte()) {

if (j == iter.reusableChars.length) {

char[] newBuf = new char[iter.reusableChars.length * 2];

System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);

iter.reusableChars = newBuf;

}

switch (c) {

case '-':

case '+':

case '.':

case 'e':

case 'E':

case '0':

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

iter.reusableChars[j++] = (char) c;

break;

default:

iter.unreadByte();

return new String(iter.reusableChars, 0, j);

}

return new String(iter.reusableChars, 0, j);

}

public static final int readInt(Jsoniter iter) throws IOException {

byte c = iter.nextToken();

if (c == '-') {

return -readUnsignedInt(iter);

} else {

iter.unreadByte();

return readUnsignedInt(iter);

}

public static final int readUnsignedInt(Jsoniter iter) throws IOException {

// TODO: throw overflow

byte c = iter.readByte();

int v = digits[c];

if (v == 0) {

return 0;

}

if (v == -1) {

throw iter.reportError("readUnsignedInt", "expect 0~9");

}

int result = 0;

for (; ; ) {

result = result * 10 + v;

c = iter.readByte();

v = digits[c];

if (v == -1) {

iter.unreadByte();

break;

}

return result;

}

public static final long readLong(Jsoniter iter) throws IOException {

byte c = iter.nextToken();

if (c == '-') {

return -readUnsignedLong(iter);

} else {

iter.unreadByte();

return readUnsignedLong(iter);

}

public static final long readUnsignedLong(Jsoniter iter) throws IOException {

// TODO: throw overflow

byte c = iter.readByte();

int v = digits[c];

if (v == 0) {

return 0;

}

if (v == -1) {

throw iter.reportError("readUnsignedLong", "expect 0~9");

}

long result = 0;

for (; ; ) {

result = result * 10 + v;

c = iter.readByte();

v = digits[c];

if (v == -1) {

iter.unreadByte();

break;

}

return result;

}

public static final char readU4(Jsoniter iter) throws IOException {

int v = digits[iter.readByte()];

if (v == -1) {

throw iter.reportError("readU4", "bad unicode");

}

char b = (char) v;

v = digits[iter.readByte()];

if (v == -1) {

throw iter.reportError("readU4", "bad unicode");

}

b = (char) (b << 4);

b += v;

v = digits[iter.readByte()];

if (v == -1) {

throw iter.reportError("readU4", "bad unicode");

}

b = (char) (b << 4);

b += v;

v = digits[iter.readByte()];

if (v == -1) {

throw iter.reportError("readU4", "bad unicode");

}

b = (char) (b << 4);

b += v;

return b;

}

java/src/main/java/com/jsoniter/NumberReader.java at master · androiddream/java · GitHub

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