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IterImpl.java
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package com.jsoniter;
import com.jsoniter.any.Any;
import com.jsoniter.spi.JsonException;
import com.jsoniter.spi.Slice;
import java.io.IOException;
import java.math.BigInteger;
class IterImpl {
private static BigInteger maxLong = BigInteger.valueOf(Long.MAX_VALUE);
private static BigInteger minLong = BigInteger.valueOf(Long.MIN_VALUE);
private static BigInteger maxInt = BigInteger.valueOf(Integer.MAX_VALUE);
private static BigInteger minInt = BigInteger.valueOf(Integer.MIN_VALUE);
public static final int readObjectFieldAsHash(JsonIterator iter) throws IOException {
if (readByte(iter) != '"') {
if (nextToken(iter) != '"') {
throw iter.reportError("readObjectFieldAsHash", "expect \"");
}
}
long hash = 0x811c9dc5;
int i = iter.head;
for (; i < iter.tail; i++) {
byte c = iter.buf[i];
if (c == '"') {
break;
}
hash ^= c;
hash *= 0x1000193;
}
iter.head = i + 1;
if (readByte(iter) != ':') {
if (nextToken(iter) != ':') {
throw iter.reportError("readObjectFieldAsHash", "expect :");
}
}
return (int) hash;
}
public static final Slice readObjectFieldAsSlice(JsonIterator iter) throws IOException {
Slice field = readSlice(iter);
if (nextToken(iter) != ':') {
throw iter.reportError("readObjectFieldAsSlice", "expect : after object field");
}
return field;
}
final static void skipArray(JsonIterator iter) throws IOException {
int level = 1;
for (int i = iter.head; i < iter.tail; i++) {
switch (iter.buf[i]) {
case '"': // If inside string, skip it
iter.head = i + 1;
skipString(iter);
i = iter.head - 1; // it will be i++ soon
break;
case '[': // If open symbol, increase level
level++;
break;
case ']': // If close symbol, decrease level
level--;
// If we have returned to the original level, we're done
if (level == 0) {
iter.head = i + 1;
return;
}
break;
}
}
throw iter.reportError("skipArray", "incomplete array");
}
final static void skipObject(JsonIterator iter) throws IOException {
int level = 1;
for (int i = iter.head; i < iter.tail; i++) {
switch (iter.buf[i]) {
case '"': // If inside string, skip it
iter.head = i + 1;
skipString(iter);
i = iter.head - 1; // it will be i++ soon
break;
case '{': // If open symbol, increase level
level++;
break;
case '}': // If close symbol, decrease level
level--;
// If we have returned to the original level, we're done
if (level == 0) {
iter.head = i + 1;
return;
}
break;
}
}
throw iter.reportError("skipObject", "incomplete object");
}
final static void skipString(JsonIterator iter) throws IOException {
int end = IterImplSkip.findStringEnd(iter);
if (end == -1) {
throw iter.reportError("skipString", "incomplete string");
} else {
iter.head = end;
}
}
final static void skipUntilBreak(JsonIterator iter) throws IOException {
// true, false, null, number
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (IterImplSkip.breaks[c]) {
iter.head = i;
return;
}
}
iter.head = iter.tail;
}
final static boolean skipNumber(JsonIterator iter) throws IOException {
// true, false, null, number
boolean dotFound = false;
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (c == '.' || c == 'e' || c == 'E') {
dotFound = true;
continue;
}
if (IterImplSkip.breaks[c]) {
iter.head = i;
return dotFound;
}
}
iter.head = iter.tail;
return dotFound;
}
// read the bytes between " "
public final static Slice readSlice(JsonIterator iter) throws IOException {
if (IterImpl.nextToken(iter) != '"') {
throw iter.reportError("readSlice", "expect \" for string");
}
int end = IterImplString.findSliceEnd(iter);
if (end == -1) {
throw iter.reportError("readSlice", "incomplete string");
} else {
// reuse current buffer
iter.reusableSlice.reset(iter.buf, iter.head, end - 1);
iter.head = end;
return iter.reusableSlice;
}
}
final static byte nextToken(final JsonIterator iter) throws IOException {
int i = iter.head;
for (; ; ) {
byte c = iter.buf[i++];
switch (c) {
case ' ':
case '\n':
case '\r':
case '\t':
continue;
default:
iter.head = i;
return c;
}
}
}
final static byte readByte(JsonIterator iter) throws IOException {
return iter.buf[iter.head++];
}
public static Any readAny(JsonIterator iter) throws IOException {
int start = iter.head;
byte c = nextToken(iter);
switch (c) {
case '"':
skipString(iter);
return Any.lazyString(iter.buf, start, iter.head);
case 't':
skipFixedBytes(iter, 3);
return Any.wrap(true);
case 'f':
skipFixedBytes(iter, 4);
return Any.wrap(false);
case 'n':
if (readByte(iter) == 'u' &&
readByte(iter) == 'l' &&
readByte(iter) == 'l') {
return Any.wrap((Object) null);
} else {
throw iter.reportError("readAny", "expected 'null' but found something else");
}
case '[':
skipArray(iter);
return Any.lazyArray(iter.buf, start, iter.head);
case '{':
skipObject(iter);
return Any.lazyObject(iter.buf, start, iter.head);
default:
if (skipNumber(iter)) {
return Any.lazyDouble(iter.buf, start, iter.head);
} else {
return Any.lazyLong(iter.buf, start, iter.head);
}
}
}
public static void skipFixedBytes(JsonIterator iter, int n) throws IOException {
iter.head += n;
}
public final static boolean loadMore(JsonIterator iter) throws IOException {
return false;
}
public final static int readStringSlowPath(JsonIterator iter, int j) throws IOException {
try {
boolean isExpectingLowSurrogate = false;
for (int i = iter.head; i < iter.tail; ) {
int bc = iter.buf[i++];
if (bc == '"') {
iter.head = i;
return j;
}
if (bc == '\\') {
bc = iter.buf[i++];
switch (bc) {
case 'b':
bc = '\b';
break;
case 't':
bc = '\t';
break;
case 'n':
bc = '\n';
break;
case 'f':
bc = '\f';
break;
case 'r':
bc = '\r';
break;
case '"':
case '/':
case '\\':
break;
case 'u':
bc = (IterImplString.translateHex(iter.buf[i++]) << 12) +
(IterImplString.translateHex(iter.buf[i++]) << 8) +
(IterImplString.translateHex(iter.buf[i++]) << 4) +
IterImplString.translateHex(iter.buf[i++]);
if (Character.isHighSurrogate((char) bc)) {
if (isExpectingLowSurrogate) {
throw new JsonException("invalid surrogate");
} else {
isExpectingLowSurrogate = true;
}
} else if (Character.isLowSurrogate((char) bc)) {
if (isExpectingLowSurrogate) {
isExpectingLowSurrogate = false;
} else {
throw new JsonException("invalid surrogate");
}
} else {
if (isExpectingLowSurrogate) {
throw new JsonException("invalid surrogate");
}
}
break;
default:
throw iter.reportError("readStringSlowPath", "invalid escape character: " + bc);
}
} else if ((bc & 0x80) != 0) {
final int u2 = iter.buf[i++];
if ((bc & 0xE0) == 0xC0) {
bc = ((bc & 0x1F) << 6) + (u2 & 0x3F);
} else {
final int u3 = iter.buf[i++];
if ((bc & 0xF0) == 0xE0) {
bc = ((bc & 0x0F) << 12) + ((u2 & 0x3F) << 6) + (u3 & 0x3F);
} else {
final int u4 = iter.buf[i++];
if ((bc & 0xF8) == 0xF0) {
bc = ((bc & 0x07) << 18) + ((u2 & 0x3F) << 12) + ((u3 & 0x3F) << 6) + (u4 & 0x3F);
} else {
throw iter.reportError("readStringSlowPath", "invalid unicode character");
}
if (bc >= 0x10000) {
// check if valid unicode
if (bc >= 0x110000)
throw iter.reportError("readStringSlowPath", "invalid unicode character");
// split surrogates
final int sup = bc - 0x10000;
if (iter.reusableChars.length == j) {
char[] newBuf = new char[iter.reusableChars.length * 2];
System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);
iter.reusableChars = newBuf;
}
iter.reusableChars[j++] = (char) ((sup >>> 10) + 0xd800);
if (iter.reusableChars.length == j) {
char[] newBuf = new char[iter.reusableChars.length * 2];
System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);
iter.reusableChars = newBuf;
}
iter.reusableChars[j++] = (char) ((sup & 0x3ff) + 0xdc00);
continue;
}
}
}
}
if (iter.reusableChars.length == j) {
char[] newBuf = new char[iter.reusableChars.length * 2];
System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);
iter.reusableChars = newBuf;
}
iter.reusableChars[j++] = (char) bc;
}
throw iter.reportError("readStringSlowPath", "incomplete string");
} catch (IndexOutOfBoundsException e) {
throw iter.reportError("readString", "incomplete string");
}
}
public static int updateStringCopyBound(final JsonIterator iter, final int bound) {
return bound;
}
static final int readInt(final JsonIterator iter, final byte c) throws IOException {
int ind = IterImplNumber.intDigits[c];
if (ind == 0) {
IterImplForStreaming.assertNotLeadingZero(iter);
return 0;
}
if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
throw iter.reportError("readInt", "expect 0~9");
}
if (iter.tail - iter.head > 9) {
int i = iter.head;
int ind2 = IterImplNumber.intDigits[iter.buf[i]];
if (ind2 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
return -ind;
}
int ind3 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind3 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 10 + ind2;
return -ind;
}
int ind4 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind4 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 100 + ind2 * 10 + ind3;
return -ind;
}
int ind5 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind5 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 1000 + ind2 * 100 + ind3 * 10 + ind4;
return -ind;
}
int ind6 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind6 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 10000 + ind2 * 1000 + ind3 * 100 + ind4 * 10 + ind5;
return -ind;
}
int ind7 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind7 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 100000 + ind2 * 10000 + ind3 * 1000 + ind4 * 100 + ind5 * 10 + ind6;
return -ind;
}
int ind8 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind8 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 1000000 + ind2 * 100000 + ind3 * 10000 + ind4 * 1000 + ind5 * 100 + ind6 * 10 + ind7;
return -ind;
}
int ind9 = IterImplNumber.intDigits[iter.buf[++i]];
ind = ind * 10000000 + ind2 * 1000000 + ind3 * 100000 + ind4 * 10000 + ind5 * 1000 + ind6 * 100 + ind7 * 10 + ind8;
iter.head = i;
if (ind9 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
return -ind;
}
}
return IterImplForStreaming.readIntSlowPath(iter, ind);
}
static final long readLong(final JsonIterator iter, final byte c) throws IOException {
long ind = IterImplNumber.intDigits[c];
if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
throw iter.reportError("readLong", "expect 0~9");
}
if (iter.tail - iter.head > 9) {
int i = iter.head;
int ind2 = IterImplNumber.intDigits[iter.buf[i]];
if (ind2 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
return -ind;
}
int ind3 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind3 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 10 + ind2;
return -ind;
}
int ind4 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind4 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 100 + ind2 * 10 + ind3;
return -ind;
}
int ind5 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind5 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 1000 + ind2 * 100 + ind3 * 10 + ind4;
return -ind;
}
int ind6 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind6 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 10000 + ind2 * 1000 + ind3 * 100 + ind4 * 10 + ind5;
return -ind;
}
int ind7 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind7 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 100000 + ind2 * 10000 + ind3 * 1000 + ind4 * 100 + ind5 * 10 + ind6;
return -ind;
}
int ind8 = IterImplNumber.intDigits[iter.buf[++i]];
if (ind8 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
iter.head = i;
ind = ind * 1000000 + ind2 * 100000 + ind3 * 10000 + ind4 * 1000 + ind5 * 100 + ind6 * 10 + ind7;
return -ind;
}
int ind9 = IterImplNumber.intDigits[iter.buf[++i]];
ind = ind * 10000000 + ind2 * 1000000 + ind3 * 100000 + ind4 * 10000 + ind5 * 1000 + ind6 * 100 + ind7 * 10 + ind8;
iter.head = i;
if (ind9 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {
return -ind;
}
}
return IterImplForStreaming.readLongSlowPath(iter, ind);
}
static final double readDouble(final JsonIterator iter) throws IOException {
int oldHead = iter.head;
try {
try {
long value = IterImplNumber.readLong(iter); // without the dot & sign
if (iter.head == iter.tail) {
return value;
}
byte c = iter.buf[iter.head];
if (c == '.') {
iter.head++;
int start = iter.head;
c = iter.buf[iter.head++];
long decimalPart = readLong(iter, c);
if (decimalPart == Long.MIN_VALUE) {
return IterImplForStreaming.readDoubleSlowPath(iter);
}
decimalPart = -decimalPart;
int decimalPlaces = iter.head - start;
if (decimalPlaces > 0 && decimalPlaces < IterImplNumber.POW10.length && (iter.head - oldHead) < 10) {
return value + (decimalPart / (double) IterImplNumber.POW10[decimalPlaces]);
} else {
iter.head = oldHead;
return IterImplForStreaming.readDoubleSlowPath(iter);
}
} else {
return value;
}
} finally {
if (iter.head < iter.tail && (iter.buf[iter.head] == 'e' || iter.buf[iter.head] == 'E')) {
iter.head = oldHead;
return IterImplForStreaming.readDoubleSlowPath(iter);
}
}
} catch (JsonException e) {
iter.head = oldHead;
return IterImplForStreaming.readDoubleSlowPath(iter);
}
}
}