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package com.jsoniter;

import com.jsoniter.any.Any;

import java.io.IOException;

class IterImpl {

public static final int readObjectFieldAsHash(JsonIterator iter) throws IOException {

if (nextToken(iter) != '"') {

throw iter.reportError("readObjectFieldAsHash", "expect \"");

}

long hash = 0x811c9dc5;

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

byte c = iter.buf[i];

if (c == '"') {

iter.head = i + 1;

if (nextToken(iter) != ':') {

throw iter.reportError("readObjectFieldAsHash", "expect :");

}

return (int) hash;

}

hash ^= c;

hash *= 0x1000193;

}

throw iter.reportError("readObjectFieldAsHash", "unmatched quote");

}

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, increase 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, increase 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 == '.') {

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(JsonIterator iter) throws IOException {

int i = iter.head;

try {

for (; ; ) {

byte c = iter.buf[i++];

switch (c) {

case ' ':

case '\n':

case '\r':

case '\t':

continue;

default:

if (i > iter.tail) {

iter.head = iter.tail;

return 0;

}

iter.head = i;

return c;

}

}

} catch (IndexOutOfBoundsException e) {

iter.head = iter.tail;

return 0;

}

}

final static byte readByte(JsonIterator iter) throws IOException {

if (iter.head == iter.tail) {

return 0;

}

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 '-':

case '0':

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

if (skipNumber(iter)) {

return Any.lazyDouble(iter.buf, start, iter.head);

} else {

return Any.lazyLong(iter.buf, start, iter.head);

}

case 't':

skipUntilBreak(iter);

return Any.wrap(true);

case 'f':

skipUntilBreak(iter);

return Any.wrap(false);

case 'n':

skipUntilBreak(iter);

return Any.wrap((Object) null);

case '[':

skipArray(iter);

return Any.lazyArray(iter.buf, start, iter.head);

case '{':

skipObject(iter);

return Any.lazyObject(iter.buf, start, iter.head);

default:

throw iter.reportError("IterImplSkip", "do not know how to skip: " + c);

}

}

public static void skipFixedBytes(JsonIterator iter, int n) throws IOException {

iter.head += n;

}

}