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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "jsonstream.h"
#include "jsonexception.h"
#include <vespa/vespalib/util/exceptions.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <vespa/vespalib/util/stringfmt.h>
namespace vespalib {
JsonStream::StateEntry::StateEntry() noexcept
: state(State::ROOT), object_key(""), array_index(size_t(0))
{}
JsonStream::StateEntry::StateEntry(State s) noexcept
: state(s), object_key(""), array_index(size_t(0))
{}
JsonStream::StateEntry::StateEntry(State s, stringref key) noexcept
: state(s), object_key(key), array_index(size_t(0))
{}
JsonStream::StateEntry::StateEntry(const StateEntry &) noexcept = default;
JsonStream::StateEntry & JsonStream::StateEntry::operator =(const StateEntry &) noexcept = default;
JsonStream::StateEntry::~StateEntry() = default;
const char*
JsonStream::getStateName(const State& s) {
switch (s) {
case State::OBJECT_EXPECTING_KEY: return "ObjectExpectingKey";
case State::OBJECT_EXPECTING_VALUE: return "ObjectExpectingValue";
case State::ARRAY: return "ArrayExpectingValue";
case State::ROOT: return "RootExpectingArrayOrObjectStart";
}
throw IllegalStateException("Control should not reach this point", VESPA_STRLOC);
}
JsonStream::JsonStream(asciistream& as, bool createIndents)
: _writer(as)
{
if (createIndents) _writer.setPretty();
push({State::ROOT});
}
JsonStream::~JsonStream() = default;
JsonStream&
JsonStream::operator<<(stringref value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add a string value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
_writer.appendKey(value);
top() = {State::OBJECT_EXPECTING_VALUE, value};
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendString(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendString(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendString(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(bool value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add a bool value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("A bool value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendBool(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendBool(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendBool(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(double value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add a double value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("A double value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendDouble(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendDouble(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendDouble(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(float value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add a float value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("A float value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendFloat(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendFloat(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendDouble(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(long long value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add a long long value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("An int64_t value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendInt64(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendInt64(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendInt64(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(unsigned long long value)
{
if (_state.empty()) {
fail("Stream already finalized. Can't add an unsigned long long value.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("A uint64_t value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.appendUInt64(value);
top().state = State::OBJECT_EXPECTING_KEY;
break;
}
case State::ARRAY: {
_writer.appendUInt64(value);
++top().array_index;
break;
}
case State::ROOT: {
_writer.appendUInt64(value);
pop();
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(const Object&)
{
if (_state.empty()) {
fail("Stream already finalized. Can't start a new object.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("An object value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.beginObject();
top().state = State::OBJECT_EXPECTING_KEY;
push({State::OBJECT_EXPECTING_KEY, ""});
break;
}
case State::ARRAY: {
_writer.beginObject();
push({State::OBJECT_EXPECTING_KEY, ""});
break;
}
case State::ROOT: {
_writer.beginObject();
top() = {State::OBJECT_EXPECTING_KEY, ""};
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(const Array&)
{
if (_state.empty()) {
fail("Stream already finalized. Can't start a new array.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
fail("An array value cannot be an object key");
break;
}
case State::OBJECT_EXPECTING_VALUE: {
_writer.beginArray();
top().state = State::OBJECT_EXPECTING_KEY;
push({State::ARRAY});
break;
}
case State::ARRAY: {
_writer.beginArray();
push({State::ARRAY});
break;
}
case State::ROOT: {
_writer.beginArray();
top() = {State::ARRAY};
break;
}
}
return *this;
}
JsonStream&
JsonStream::operator<<(const End&)
{
if (_state.empty()) {
fail("Stream already finalized. Can't end it.");
}
switch (top().state) {
case State::OBJECT_EXPECTING_KEY: {
_writer.endObject();
pop();
break;
}
case State::OBJECT_EXPECTING_VALUE: {
fail("Object got key but not value. Cannot end it now");
break;
}
case State::ARRAY: {
_writer.endArray();
pop();
break;
}
case State::ROOT: {
fail("No tag to end. At root");
break;
}
}
if (!_state.empty() && top().state == State::ARRAY) {
++top().array_index;
}
return *this;
}
JsonStream&
JsonStream::finalize()
{
while (!_state.empty()) {
operator<<(End());
}
return *this;
}
string
JsonStream::getStateString() const
{
asciistream as;
for (auto it(_state.begin()), mt(_state.end()); it != mt; it++) {
switch (it->state) {
case State::OBJECT_EXPECTING_KEY:
case State::OBJECT_EXPECTING_VALUE: {
as << "{" << it->object_key << "}";
break;
}
case State::ARRAY: {
as << "[";
if (it->array_index != 0) {
as << (it->array_index - 1);
}
as << "]";
break;
}
case State::ROOT: {
break;
}
}
}
if (_state.empty()) {
as << "Finalized";
} else {
as << "(" << getStateName(_state.back().state) << ")";
}
return as.str();
}
string
JsonStream::getJsonStreamState() const
{
asciistream report;
report << "Current: " << getStateString();
return report.str();
}
void
JsonStream::fail(stringref error) const
{
asciistream report;
report << "Invalid state on call: " << error
<< " (" << getStateString() << ")";
throw JsonStreamException(report.str(), "", VESPA_STRLOC);
}
}
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