java/src/main/java/com/jsoniter/IterImplString.java at master · lyBigdata/java · GitHub

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package com.jsoniter;

import java.io.IOException;

import static java.lang.Character.*;

class IterImplString {

final static int[] hexDigits = new int['f' + 1];

static {

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

hexDigits[i] = -1;

}

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

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

}

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

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

}

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

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

}

public static final String readString(JsonIterator iter) throws IOException {

byte c = IterImpl.nextToken(iter);

if (c == '"') {

// try fast path first

int j = 0;

fast_loop:

for (; ; ) {

// copy ascii to buffer

int i = iter.head;

for (; i < iter.tail && j < iter.reusableChars.length; i++, j++) {

c = iter.buf[i];

if (c == '"') {

iter.head = i + 1;

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

}

// If we encounter a backslash, which is a beginning of an escape sequence

// or a high bit was set - indicating an UTF-8 encoded multibyte character,

// there is no chance that we can decode the string without instantiating

// a temporary buffer, so quit this loop

if ((c ^ '\\') < 1) {

iter.head = i;

break fast_loop;

}

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

}

if (i == iter.tail) {

if (IterImpl.loadMore(iter)) {

i = iter.head;

continue;

} else {

throw iter.reportError("readString", "incomplete string");

}

iter.head = i;

// resize to copy more

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;

} else {

break;

}

return IterImpl.readStringSlowPath(iter, j);

}

if (c == 'n') {

IterImpl.skipFixedBytes(iter, 3);

return null;

}

throw iter.reportError("readString", "expect n or \"");

}

public static int translateHex(final byte b) {

int val = hexDigits[b];

if (val == -1) {

throw new IndexOutOfBoundsException(b + " is not valid hex digit");

}

return val;

}

// slice does not allow escape

final static int findSliceEnd(JsonIterator iter) {

for (int i = iter.head; i < iter.tail; i++) {

byte c = iter.buf[i];

if (c == '"') {

return i + 1;

} else if (c == '\\') {

throw iter.reportError("findSliceEnd", "slice does not support escape char");

}

return -1;

}

java/src/main/java/com/jsoniter/IterImplString.java at master · lyBigdata/java · GitHub

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