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IterImplSkip.java
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196 lines (183 loc) · 6.07 KB
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package com.jsoniter;
import java.io.IOException;
class IterImplSkip {
private static final boolean[] breaks = new boolean[256];
static {
breaks[' '] = true;
breaks['\t'] = true;
breaks['\n'] = true;
breaks['\r'] = true;
breaks[','] = true;
breaks['}'] = true;
breaks[']'] = true;
}
public static final void skip(JsonIterator iter) throws IOException {
byte c = iter.nextToken();
switch (c) {
case '"':
skipString(iter);
return;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 't':
case 'f':
case 'n':
skipUntilBreak(iter);
return;
case '[':
skipArray(iter);
return;
case '{':
skipObject(iter);
return;
default:
throw iter.reportError("IterImplSkip", "do not know how to skip: " + c);
}
}
final static void skipObject(JsonIterator iter) throws IOException {
int level = 1;
for (; ; ) {
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, increase level
level--;
// If we have returned to the original level, we're done
if (level == 0) {
iter.head = i + 1;
return;
}
break;
}
}
if (!iter.loadMore()) {
return;
}
}
}
final static void skipArray(JsonIterator iter) throws IOException {
int level = 1;
for (; ; ) {
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, increase level
level--;
// If we have returned to the original level, we're done
if (level == 0) {
iter.head = i + 1;
return;
}
break;
}
}
if (!iter.loadMore()) {
return;
}
}
}
final static void skipUntilBreak(JsonIterator iter) throws IOException {
// true, false, null, number
for (; ; ) {
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (breaks[c]) {
iter.head = i;
return;
}
}
if (!iter.loadMore()) {
return;
}
}
}
final static void skipString(JsonIterator iter) throws IOException {
for (; ; ) {
int end = findStringEnd(iter);
if (end == -1) {
int j = iter.tail - 1;
boolean escaped = true;
for (; ; ) {
if (j < iter.head || iter.buf[j] != '\\') {
// even number of backslashes
// either end of buffer, or " found
escaped = false;
break;
}
j--;
if (j < iter.head || iter.buf[j] != '\\') {
// odd number of backslashes
// it is \" or \\\"
break;
}
j--;
}
if (!iter.loadMore()) {
return;
}
if (escaped) {
iter.head = 1; // skip the first char as last char readAny is \
}
} else {
iter.head = end;
return;
}
}
}
// adapted from: https://github.com/buger/jsonparser/blob/master/parser.go
// Tries to find the end of string
// Support if string contains escaped quote symbols.
final static int findStringEnd(JsonIterator iter) {
boolean escaped = false;
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (c == '"') {
if (!escaped) {
return i + 1;
} else {
int j = i - 1;
for (; ; ) {
if (j < iter.head || iter.buf[j] != '\\') {
// even number of backslashes
// either end of buffer, or " found
return i + 1;
}
j--;
if (j < iter.head || iter.buf[j] != '\\') {
// odd number of backslashes
// it is \" or \\\"
break;
}
j--;
}
}
} else if (c == '\\') {
escaped = true;
}
}
return -1;
}
}