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JsonIterator.java
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206 lines (187 loc) · 7.44 KB
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package org.simdjson;
import java.util.Arrays;
class JsonIterator {
private static final int OBJECT_BEGIN = 0;
private static final int ARRAY_BEGIN = 1;
private static final int DOCUMENT_END = 2;
private static final int OBJECT_FIELD = 3;
private static final int OBJECT_CONTINUE = 4;
private static final int SCOPE_END = 5;
private static final int ARRAY_CONTINUE = 6;
private static final int ARRAY_VALUE = 7;
private final TapeBuilder tapeBuilder;
private final BitIndexes indexer;
private final boolean[] isArray;
JsonIterator(BitIndexes indexer, byte[] stringBuffer, int capacity, int maxDepth, int padding) {
this.indexer = indexer;
this.isArray = new boolean[maxDepth];
this.tapeBuilder = new TapeBuilder(capacity, maxDepth, padding, stringBuffer);
}
JsonValue walkDocument(byte[] buffer, int len) {
if (indexer.isEnd()) {
throw new JsonParsingException("No structural element found.");
}
tapeBuilder.visitDocumentStart();
int depth = 0;
int state;
int idx = indexer.getAndAdvance();
switch (buffer[idx]) {
case '{' -> {
if (buffer[indexer.getLast()] != '}') {
throw new JsonParsingException("Unclosed object. Missing '}' for starting '{'.");
}
if (buffer[indexer.peek()] == '}') {
indexer.advance();
tapeBuilder.visitEmptyObject();
state = DOCUMENT_END;
} else {
state = OBJECT_BEGIN;
}
}
case '[' -> {
if (buffer[indexer.getLast()] != ']') {
throw new JsonParsingException("Unclosed array. Missing ']' for starting '['.");
}
if (buffer[indexer.peek()] == ']') {
indexer.advance();
tapeBuilder.visitEmptyArray();
state = DOCUMENT_END;
} else {
state = ARRAY_BEGIN;
}
}
default -> {
tapeBuilder.visitRootPrimitive(buffer, idx, len);
state = DOCUMENT_END;
}
}
while (state != DOCUMENT_END) {
if (state == OBJECT_BEGIN) {
depth++;
isArray[depth] = false;
tapeBuilder.visitObjectStart(depth);
int keyIdx = indexer.getAndAdvance();
if (buffer[keyIdx] != '"') {
throw new JsonParsingException("Object does not start with a key");
}
tapeBuilder.incrementCount(depth);
tapeBuilder.visitKey(buffer, keyIdx);
state = OBJECT_FIELD;
}
if (state == OBJECT_FIELD) {
if (buffer[indexer.getAndAdvance()] != ':') {
throw new JsonParsingException("Missing colon after key in object");
}
idx = indexer.getAndAdvance();
switch (buffer[idx]) {
case '{' -> {
if (buffer[indexer.peek()] == '}') {
indexer.advance();
tapeBuilder.visitEmptyObject();
state = OBJECT_CONTINUE;
} else {
state = OBJECT_BEGIN;
}
}
case '[' -> {
if (buffer[indexer.peek()] == ']') {
indexer.advance();
tapeBuilder.visitEmptyArray();
state = OBJECT_CONTINUE;
} else {
state = ARRAY_BEGIN;
}
}
default -> {
tapeBuilder.visitPrimitive(buffer, idx);
state = OBJECT_CONTINUE;
}
}
}
if (state == OBJECT_CONTINUE) {
switch (buffer[indexer.getAndAdvance()]) {
case ',' -> {
tapeBuilder.incrementCount(depth);
int keyIdx = indexer.getAndAdvance();
if (buffer[keyIdx] != '"') {
throw new JsonParsingException("Key string missing at beginning of field in object");
}
tapeBuilder.visitKey(buffer, keyIdx);
state = OBJECT_FIELD;
}
case '}' -> {
tapeBuilder.visitObjectEnd(depth);
state = SCOPE_END;
}
default -> throw new JsonParsingException("No comma between object fields");
}
}
if (state == SCOPE_END) {
depth--;
if (depth == 0) {
state = DOCUMENT_END;
} else if (isArray[depth]) {
state = ARRAY_CONTINUE;
} else {
state = OBJECT_CONTINUE;
}
}
if (state == ARRAY_BEGIN) {
depth++;
isArray[depth] = true;
tapeBuilder.visitArrayStart(depth);
tapeBuilder.incrementCount(depth);
state = ARRAY_VALUE;
}
if (state == ARRAY_VALUE) {
idx = indexer.getAndAdvance();
switch (buffer[idx]) {
case '{' -> {
if (buffer[indexer.peek()] == '}') {
indexer.advance();
tapeBuilder.visitEmptyObject();
state = ARRAY_CONTINUE;
} else {
state = OBJECT_BEGIN;
}
}
case '[' -> {
if (buffer[indexer.peek()] == ']') {
indexer.advance();
tapeBuilder.visitEmptyArray();
state = ARRAY_CONTINUE;
} else {
state = ARRAY_BEGIN;
}
}
default -> {
tapeBuilder.visitPrimitive(buffer, idx);
state = ARRAY_CONTINUE;
}
}
}
if (state == ARRAY_CONTINUE) {
switch (buffer[indexer.getAndAdvance()]) {
case ',' -> {
tapeBuilder.incrementCount(depth);
state = ARRAY_VALUE;
}
case ']' -> {
tapeBuilder.visitArrayEnd(depth);
state = SCOPE_END;
}
default -> throw new JsonParsingException("Missing comma between array values");
}
}
}
tapeBuilder.visitDocumentEnd();
if (!indexer.isEnd()) {
throw new JsonParsingException("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
}
return tapeBuilder.createJsonValue(buffer);
}
void reset() {
tapeBuilder.reset();
Arrays.fill(isArray, false);
}
}