Commit fa1426e4 authored by EXT Arnaud Clère's avatar EXT Arnaud Clère
parents e5968210 90cb6e83
......@@ -64,25 +64,25 @@ end
The automaton is implemented as follows:
- `QVal<_>`, `QRec<_>` and `QSeq<_>` types implement possible states where _ denotes the type of outer state
- State types only expose public methods corresponding to possible transitions, that return the destination state type
- The initial state type is `QValue` and the final state is `QValueStatus` (for instance: `QValue::null()` returns a `QValueStatus`)
- Returning a `QRec<_>` or `QSeq<_>` type automatically convert to the final `QValueStatus` type invoking as much `out()` transitions as required
- `QValueStatus` is a non-owning pointer to an `QAbstractValue` interface which implementations translate data traversal into specific
- The initial state type is `QValue` and the final state is `QCur` (for instance: `QValue::null()` returns a `QCur`)
- Returning a `QRec<_>` or `QSeq<_>` type automatically convert to the final `QCur` type invoking as much `out()` transitions as required
- `QCur` is a non-owning pointer to an `QAbstractValue` interface which implementations translate data traversal into specific
data format read/write actions
- `QValueStatus` instance is moved from the start state type to the end state type only for successful transitions, allowing to test
- `QCur` instance is moved from the start state type to the end state type only for successful transitions, allowing to test
alternatives before proceeding with the traversal
- Transitions may fail for various reasons specific to `QAbstractValue` implementations:
- builders may not be able to allocate new items
- readers may read data not matching the expected transition
- ...
- In case of unsuccessfull transition the returned state type receives a null `QValueStatus` that transparently bypasses calls to `QAbstractValue`
- In case of unsuccessfull transition the returned state type receives a null `QCur` that transparently bypasses calls to `QAbstractValue`
- `bind<T>()` calls are forwarded to the actual `QAbstractValue` or generic `QTransmogrifier` depending on `BindSupport<T>`:
- BindNative : **QAbstractValue** interface method
- BindGeneric : **QTransmogrifier** template specialization for T
- Every `bind<T>()` starts from a QValue which is an un *unsafe* QValueStatus copy wrt well-formedness (these `unsafeItem()` copies are protected from incorrect use)
- Every `bind<T>()` starts from a QValue which is an un *unsafe* QCur copy wrt well-formedness (these `unsafeItem()` copies are protected from incorrect use)
## C++ types extensibility
QTransmogrifier is a functor templated on T type receiving a Value and T reference (either lvalue or rvalue reference) and returning the QValueStatus.
QTransmogrifier is a functor templated on T type receiving a Value and T reference (either lvalue or rvalue reference) and returning the QCur.
Template specializations can be defined for any T and optionally refined for specific Cur<TImpl> with different sets of BindNative types.
A default QTransmogrifier specialization attempts to call `T::bind(...)` to conveniently bind `T* this` without having to understand template syntax,
......@@ -96,28 +96,28 @@ editor will propose to either `bind(myData.item)`, or to construct a `sequence()
## Well-formedness guarantees
Thanks to this design, the compiler will make sure that the only possibility to return a QValueStatus from a `QValue` is to traverse
Thanks to this design, the compiler will make sure that the only possibility to return a QCur from a `QValue` is to traverse
the data without backtracking, calling only and all necessary QAbstractValue virtual methods.
The addition of default and optional values take into account most data schema evolutions in a purely declarative fluent interface without
having to test schema versions and the like. The benefit is that it is not possible to introduce bugs using just the fluent interface.
The downside is that writing loops with the fluent interface is unnatural as one must never forget to follow the valid QValueStatus.
The downside is that writing loops with the fluent interface is unnatural as one must never forget to follow the valid QCur.
For instance:
```cpp
auto seq(v.sequence());
for (auto&& t : ts) {
seq = seq.bind(t); // do not forget to reassign seq, or subsequent items will be `bind` to the moved-from QValueStatus and automatically ignored
seq = seq.bind(t); // do not forget to reassign seq, or subsequent items will be `bind` to the moved-from QCur and automatically ignored
}
```
## Write performance
Since `QValueStatus`, `QVal`, `QRec` and `QSeq` have no data member other than outer types and `QAbstractValue*`, calling their methods can be
Since `QCur`, `QVal`, `QRec` and `QSeq` have no data member other than outer types and `QAbstractValue*`, calling their methods can be
optimized and replaced with just the following operations:
1. test the QAbstractValue pointer validity [^1]
2. call the QAbstractValue virtual method corresponding to the possible transitions
3. return the resulting QValueStatus, QVal, QRec or QSeq with a valid or invalid QValueStatus depending on QAbstractValue method success or failure
3. return the resulting QCur, QVal, QRec or QSeq with a valid or invalid QCur depending on QAbstractValue method success or failure
[^1]: Experiments to use constexpr to bypass this step for writers that always return true did not seem to improve performance.
......
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......@@ -62,15 +62,14 @@ public:
QValueMode mode() const noexcept { return QValueMode::Write; }
// Shortcuts
QValue value ( ) { return QValueStatus(this).value(); }
QSequence sequence(quint32* s=nullptr) { return QValueStatus(this).value().sequence(s); }
QValue value ( ) { return QCur(this).value(); }
QSequence sequence(quint32* s=nullptr) { return QCur(this).value().sequence(s); }
template<typename T> QValueStatus zap(T&& t) { return QValueStatus(this).value().bind(std::forward<T>(t)); }
template<typename T> QValueEnd zap(T&& t) { return QCur(this).value().bind(std::forward<T>(t)); }
protected:
friend class QValueStatus;
friend class QCur;
bool trySequence(quint32* s=nullptr) { if (s) *io << *s; return true; }
bool tryRecord (quint32* s=nullptr) { if (s) *io << *s; return true; }
bool tryAny ( ) { return handleError(qBindUnexpectedValue); }
bool tryNull ( ) { *io << nullptr; return true; }
bool tryBind ( QUtf8DataView u) { QByteArray ba = QByteArray::fromRawData(u.data(), u.size()+int(sizeof('\0'))); return static_cast<QAbstractValue*>(this)->tryBind(ba); }
......
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......@@ -59,7 +59,7 @@ class QModelBind : public QAbstractValue
public:
QModelBind(QAbstractItemModel* m, bool rowFirst=true) : m(m), rowFirst(rowFirst) { Q_ASSERT(m); }
QValue value() { return QValueStatus(this).value(); }
QValue value() { return QCur(this).value(); }
protected:
enum : int {
T=0, //!< initial state
......
......@@ -52,12 +52,12 @@ class QSettingsWriter : public QAbstractValueWriter
{
Q_DISABLE_COPY(QSettingsWriter)
public:
QSettingsWriter(QSettings* s) : settings(s) { Q_ASSERT(s); levels.push(Level(qBindExpectedItem)); }
QSettingsWriter(QSettings* s) : settings(s) { Q_ASSERT(s); settings->beginGroup("test"); } // FIXME remove extra beginGroup
// Shortcuts
/**/ QValue value ( ) { return QValueStatus(this).value(); }
/**/ QSequence sequence(quint32* s=nullptr) { return QValueStatus(this).value().sequence(s); }
template<typename T> QValueStatus bind ( T&& t) { return QValueStatus(this).value().bind(std::forward<T>(t)); }
/**/ QValue value ( ) { return QCur(this).value(); }
/**/ QSequence sequence(quint32* s=nullptr) { return QCur(this).value().sequence(s); }
template<typename T> QValueEnd bind ( T&& t) { return QCur(this).value().bind(std::forward<T>(t)); }
protected:
bool tryBind ( quint8&& t) { settings->setValue(key(), int(t) ); return true; }
bool tryBind ( quint16&& t) { settings->setValue(key(), int(t) ); return true; }
......@@ -69,16 +69,19 @@ protected:
bool tryAny () { settings->setValue(key(), QVariant() ); return true; }
bool tryNull() { settings->setValue(key(), QVariant::fromValue(nullptr)); return true; }
bool trySequence(quint32* =nullptr) { settings->beginGroup(key()); levels.push(Level( )); return true; }
bool tryRecord (quint32* =nullptr) { settings->beginGroup(key()); levels.push(Level(qBindExpectedItem)); return true; }
bool trySequence(quint32* =nullptr) { levels.push(Level( )); settings->beginGroup(key()); return true; } // TODO use beginWriteArray
bool tryRecord (quint32* =nullptr) { levels.push(Level(qBindExpectedItem)); settings->beginGroup(key()); return true; }
bool tryItem(QIdentifier& n) { levels.last().key=n; return true; }
bool tryItem( ) { levels.last().idx++; return true; }
bool tryOut ( ) { levels.pop(); settings->endGroup(); return true; }
bool tryOut ( ) {
levels.pop();
settings->endGroup();
return true;
}
private:
QString key() {
Q_ASSERT(!levels.isEmpty());
return levels.size()==1 ? QString("") :
return levels.size()==0 ? QString("") :
!levels.last().key.isNull()
? QString (levels.last().key.latin1())
: QString::number(levels.last().idx );
......@@ -108,7 +111,7 @@ public:
}
// Shortcuts
template<typename T> QValueStatus bind(T&& t) { return QValueStatus(this).value().bind(std::forward<T>(t)); }
template<typename T> QValueEnd bind(T&& t) { return QCur(this).value().bind(std::forward<T>(t)); }
protected:
template<typename T>
bool tryBind(T& t) { return set(t, "Expected declared metatype T"); }
......@@ -132,13 +135,13 @@ protected:
bool trySequence(quint32* =nullptr) { if (levels.last().isGroup) { levels.push(Level( )); return true; } handleError(qBindExpectedSequence); return false; }
bool tryRecord (quint32* =nullptr) { if (levels.last().isGroup) { levels.push(Level(qBindExpectedItem)); return true; } handleError(qBindExpectedRecord ); return false; }
bool tryAny () { if (!settings->value(key()).isValid()) { return true; } handleError(qBindUnexpectedValue); return false; }
bool tryNull() { if ( settings->value(key()).isNull ()) { return true; } handleError(qBindExpectedNull ); return false; }
bool tryNull() { if ( settings->value(key()).isNull ()) { return true; } handleError(qBindExpectedNull); return false; }
bool tryItem(QIdentifier& k) { levels.last().key=k ; return true; }
bool tryItem( ) { levels.last().idx++ ; return true; }
bool tryOut ( ) { levels.pop(); settings->endGroup(); return true; }
bool tryAny() { return true; }
bool isValid() const noexcept { return settings; }
bool handleError(QIdentifierLiteral error, QString context = QString()) { return errorHandler ? errorHandler(error, QString(currentPath().latin1()).append(context)) : false; }
private:
......
......@@ -27,4 +27,4 @@ QIdentifierLiteral qmChildren ("children" );
QIdentifierLiteral qmName ("name" );
QIdentifierLiteral qmColor ("color" );
QValue QValueStatus::value() noexcept { return QValue(std::move(*this)); }
QValue QCur::value() noexcept { return QValue(std::move(*this)); }
This diff is collapsed.
......@@ -56,9 +56,9 @@ public:
void reset(QVariant* v) { variant=v; Q_ASSERT(v); levels.resize(0); }
// Shortcuts
/**/ QValue value ( ) { return QValueStatus(this).value(); }
/**/ QSequence sequence(quint32* s=nullptr) { return QValueStatus(this).value().sequence(s); }
template<typename T> QValueStatus bind ( T&& t) { return QValueStatus(this).value().bind(std::forward<T>(t)); }
/**/ QValue value ( ) { return QCur(this).value(); }
/**/ QSequence sequence(quint32* s=nullptr) { return QCur(this).value().sequence(s); }
template<typename T> QValueEnd bind ( T&& t) { return QCur(this).value().bind(std::forward<T>(t)); }
protected:
// TODO Support _meta to be able to cache and restitute all metadata as well as data+datatype
......@@ -170,13 +170,13 @@ protected:
bool trySequence(quint32* =nullptr) { if (current()->type()==QVariant::List ) { levels.push(Level()); return true; } handleError(qBindExpectedSequence); return false; }
bool tryRecord (quint32* =nullptr) { if (current()->type()==QVariant::Map ) { levels.push(Level()); return true; } handleError(qBindExpectedRecord ); return false; }
bool tryAny () { if (!current()->isValid()) { return true; } handleError(qBindUnexpectedValue); return false; }
bool tryNull() { if ( current()->isNull ()) { return true; } handleError(qBindExpectedNull ); return false; }
bool tryItem(QIdentifier& k) { levels.last().key=k; return (levels.last().item = current(1)->toMap ().value(QString(levels.last().key.latin1()), QVariant())).isValid(); }
bool tryItem( ) { levels.last().idx++; return (levels.last().item = current(1)->toList().value( levels.last().idx , QVariant())).isValid(); }
bool tryOut ( ) { levels.pop() ; return true; }
bool tryAny () { return true; }
bool isValid() const noexcept { return value; }
bool handleError(QIdentifierLiteral error, QString context = QString()) { return errorHandler ? errorHandler(error, QString(currentPath().latin1()).append(context)) : false; }
private:
......
......@@ -67,10 +67,10 @@ public:
QValueMode mode() const noexcept { return QValueMode::Write; }
// Shortcuts
QValue value ( ) { return QValueStatus(this).value(); }
QSequence sequence(quint32* s=nullptr) { return QValueStatus(this).value().sequence(s); }
QValue value ( ) { return QCur(this).value(); }
QSequence sequence(quint32* s=nullptr) { return QCur(this).value().sequence(s); }
template<typename T> QValueStatus bind(T&& t) { return QValueStatus(this).value().bind(std::forward<T>(t)); }
template<typename T> QValueEnd bind(T&& t) { return QCur(this).value().bind(std::forward<T>(t)); }
protected:
bool trySequence(quint32* =nullptr) { io->writeStartElement(tag("sequence" ).latin1()); att(); return true; }
bool tryRecord (quint32* =nullptr) { io->writeStartElement(tag("record" ).latin1()); att(); return true; }
......
......@@ -99,7 +99,7 @@ struct Person
{
QString firstName, lastName; double height; int age; QVector<QString> phones; QString comments; QList<Person> children;
QValueStatus zap(QValue&& value) { // works with value->mode()==Read as well as Write
QValueEnd zap(QValue&& value) { // works with value->mode()==Read as well as Write
return value
.record("Person") // aggregates a usually small number of named items in any order (Person is an optional meta-name for the record that may be ignored)
.sequence("names") // aggregates any number of items in a fixed order, just to illustrate a basic mapping between struct Person and a more general data schema
......@@ -247,8 +247,8 @@ Each specialization must implement at least the bind() method for lvalue referen
references to support temporaries, and for const lvalue reference to efficiently support copyable types.
```cpp
template<> struct QTransmogrifier<QColor> {
static QValueStatus zap(QValue&& v, QColor&& c) { QColor copy(c); return bind(std::move(v),copy); } // supports writing temporaries and const QColor&
static QValueStatus zap(QValue&& v, QColor& c) {
static QValueEnd zap(QValue&& v, QColor&& c) { QColor copy(c); return bind(std::move(v),copy); } // supports writing temporaries and const QColor&
static QValueEnd zap(QValue&& v, QColor& c) {
if (!c.isValid()) {
return v.null();
}
......
......@@ -84,7 +84,7 @@ struct Person
{
int id; QString firstName, lastName; double height; int age; QVector<Phone> phones; QString comments; QList<Person> children;
QValueStatus zap(QValue&& value) { // works with value->mode()==Read as well as Write
QValueEnd zap(QValue&& value) { // works with value->mode()==Read as well as Write
return value
.record("Person")
.sequence("names")
......@@ -137,7 +137,7 @@ struct PersonsView
{
QList<Person>& persons;
QValueStatus zap(QValue&& value) {
QValueEnd zap(QValue&& value) {
return value
.meta(qmChildren,"children")
.meta(qmColumns ,"names,height,age,phones,comments") // to optimize multi-dimensional data formats
......@@ -151,7 +151,7 @@ struct PersonsTable {
QList<Person>& persons;
PersonsTable(QList<Person>& ps) : persons(ps) {}
QValueStatus zap(QValue&& v) {
QValueEnd zap(QValue&& v) {
if (v->mode()==Read) {
ids.clear();
orphans.clear();
......@@ -254,11 +254,11 @@ private:
//! QTransmogrifier<QColor> with special support for QDataStream compatibility using meta()
template<>
struct QTransmogrifier<QColor> {
static QValueStatus zap(QValue&& v, QColor&& c) {
static QValueEnd zap(QValue&& v, QColor&& c) {
QColor copy(c);
return zap(std::move(v),copy);
}
static QValueStatus zap(QValue&& v, QColor& c) {
static QValueEnd zap(QValue&& v, QColor& c) {
if (!c.isValid()) {
return v.null();
}
......@@ -302,8 +302,8 @@ public:
TextWriter(QByteArray* utf8) : utf8(utf8) { Q_ASSERT(utf8); }
// Shortcuts
template<typename T> QSequence operator<<(T&& t) { return QValueStatus(this).value().sequence().item().bind(std::forward<T>(t)); }
template<typename T> QValueStatus bind (T&& t) { return QValueStatus(this).value() .bind(std::forward<T>(t)); }
template<typename T> QSequence operator<<(T&& t) { return QCur(this).value().sequence().item().bind(std::forward<T>(t)); }
template<typename T> QValueEnd bind (T&& t) { return QCur(this).value() .bind(std::forward<T>(t)); }
protected:
bool trySequence(quint32* =nullptr) { if (0<level++) utf8->append("["); return true; }
bool tryRecord (quint32* =nullptr) { if (0<level++) utf8->append("["); return true; }
......@@ -658,7 +658,6 @@ int main(int argc, char *argv[])
QXmlStreamWriter w(&ba);
QXmlWriter d(&w);
d.bind(person);
w.writeEndDocument(); // FIXME It should not be necessary
}
STOP("Xml",ba)
START {
......@@ -1153,7 +1152,7 @@ void doGuiExample() {
#if 0
// Design that works for Read/Write but requires several cumbersome functions
QModelWriter<>(&customModel).sequence().forEach(persons, [](Person& p, QValue&& item)->QValueStatus {
QModelWriter<>(&customModel).sequence().forEach(persons, [](Person& p, QValue&& item)->QValueEnd {
return item
.record()
.bind("first name", p.firstName)
......@@ -1162,7 +1161,7 @@ void doGuiExample() {
return item.bind(phone._n);
},
Phone::isOffice)
; // automagically closed while cast to returned QValueStatus type
; // automagically closed while cast to returned QValueEnd type
});
#endif
......@@ -1218,7 +1217,7 @@ void doGuiExample() {
{ new QStandardItemModel(&dlg), new QTableView(&dlg), "sequence().with([&](...){for...", [&](QValue&& v) {
return v.sequence().with([&](QSequence&& s) {
for (auto&& person : persons) { // Read would require looping while !s.item()
s = s // To keep working with the active QValueStatus
s = s // To keep working with the active QCur
.record()
.item("first name")
.meta(qmColor, person.age >= 42 ? "green" : "blue")
......@@ -1233,7 +1232,7 @@ void doGuiExample() {
})
.out();
}
return std::move(s); // So caller stops calling QAbstractValue if user function was unable to keep track of the active QValueStatus
return std::move(s); // So caller stops calling QAbstractValue if user function was unable to keep track of the active QCur
});}},
// The same design allows flattening trees into a sequence
......
......@@ -2,7 +2,7 @@ builtin> |=================================================================
QDebug |1.33333 3.14159 ascii characters are common in QDebug false QColor(ARGB 1, 0.176471, 0, 0.729412)
Text | 1.33333 3.14159 ascii characters are common in QDebug false [ RGB:[ 45 0 186] base:255]
Json |[1.33333337,3.1415926535897931,"ascii characters are common in QDebug",false,{"RGB":[45,0,186],"base":255}]
Xml |<sequence><decimal>1.33333337</decimal><decimal>3.1415926535897931</decimal><string>ascii characters are common in QDebug</string><boolean>false</boolean><record><RGB><integer>45</integer><integer>0</integer><integer>186</integer></RGB><base>255</base></record>
Xml |<sequence><decimal>1.33333337</decimal><decimal>3.1415926535897931</decimal><string>ascii characters are common in QDebug</string><boolean>false</boolean><record><RGB><integer>45</integer><integer>0</integer><integer>186</integer></RGB><base>255</base></record></sequence>
Variant | 1.33333 3.14159 ascii characters are common in QDebug false [ RGB:[ 45 0 186] base:255]
Cbor |85fa3faaaaabfb400921fb54442d187825617363696920636861726163746572732061726520636f6d6d6f6e20696e20514465627567f4bf635247429f182d0018baff646261736518ffff
QCborStream |85fa3faaaaabfb400921fb54442d187825617363696920636861726163746572732061726520636f6d6d6f6e20696e20514465627567f4bf635247429f182d0018baff646261736518ffff
......@@ -31,7 +31,6 @@ QDebug |Person("John", "Doe", 1.75, 18, QVector(), "unicode is likely U+0
Text |(Person) names:[ John Doe] height:1.75 age:18 phones:[] comments:unicode is likely U+01  + U+1F  + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ children:[]
Json |{"names":["John","Doe"],"height":1.75,"age":18,"phones":[],"comments":"unicode is likely U+01 \u0001 + U+1F \u001F + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ","children":[]}
Xml |<Person><names><string>John</string><string>Doe</string></names><height>1.75</height><age>18</age><phones/><comments>unicode is likely U+01 + U+1F + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ</comments><children/></Person>
Variant | age:18 children:[] comments:unicode is likely U+01  + U+1F  + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ height:1.75 names:[ John Doe] phones:[]
Cbor |bf656e616d65739f644a6f686e63446f65ff66686569676874fb3ffc00000000000063616765126670686f6e65738068636f6d6d656e74737843756e69636f6465206973206c696b656c7920552b30312001202b20552b3146201f202b20552b413420c2a420552b423020c2b020552b443820c39820552b464620c3bf686368696c6472656e80ff
QCborStream |bf656e616d65739f644a6f686e63446f65ff66686569676874fb3ffc00000000000063616765126670686f6e65738068636f6d6d656e74737843756e69636f6465206973206c696b656c7920552b30312001202b20552b3146201f202b20552b413420c2a420552b423020c2b020552b443820c39820552b464620c3bf686368696c6472656e80ff
......@@ -57,7 +56,7 @@ Bindable |
Bindable>Cbor |bf647479706502666e756d6265726b2b34342031323334353637ff
Bindable>Json |{"type":2,"number":"+44 1234567"}
Person<>Json |================================================================================
Json>P |(Person) names:[ John Doe] height:1.75 age:-1 phones:[] comments: children:[] | (0:1)IgnoredCharacter, (0:15)IgnoredCharacter, (0:23)IgnoredCharacter, (0:40)IgnoredCharacter, (0:58)IgnoredCharacter, (0:102)IgnoredCharacter
Json>P |(Person) names:[ John Doe] height:1.75 age:-1 phones:[] comments: children:[] | (0:1)IgnoredCharacter, (0:15)IgnoredCharacter, (0:23)IgnoredCharacter, (0:40)IgnoredCharacter
P>Json |{"names":["John","Doe"],"height":1.7500000000000002,"age":-1,"phones":[],"comments":"","children":[]}
Json>P |(Person) names:[ John Doe] height:1.75 age:-1 phones:[] comments: children:[] |
P>JsonValue |{"age":-1,"children":[],"comments":"","height":1.7500000000000004,"names":["John","Doe"],"phones":[]}
......@@ -73,7 +72,7 @@ P>CborValue |a6656e616d657382644a6f686e63446f6566686569676874fb3ffc00000000000
CborValue>P |(Person) names:[ John Doe] height:1.75 age:-1 phones:[] comments: children:[] |
Cbor>CborValue|{"names": ["John", "Doe"], "height": 1.75, "age": -1, "phones": [], "comments": "", "children": []} |
CborValue>Cbor|a6656e616d657382644a6f686e63446f6566686569676874fb3ffc00000000000063616765206670686f6e65738068636f6d6d656e747360686368696c6472656e80
Cbor>Json |{"names":["John","Doe"],"height":1.75,"age":} |
Cbor>Json |{"names":["John","Doe"],"height":1.75,"age":undefined} |
Person<>Settings|================================================================================
P>Settings |(Person) names:[ John Doe] height:1.75 age:18 phones:[] comments:unicode is likely U+01  + U+1F  + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ children:[]
Settings>P |(Person) names:[ John Doe] height:1.75 age:18 phones:[] comments:unicode is likely U+01  + U+1F  + U+A4 ¤ U+B0 ° U+D8 Ø U+FF ÿ children:[] |
......
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