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40
41#include <private/qv4iterator_p.h>
42#include <private/qv4stringiterator_p.h>
43#include <private/qv4symbol_p.h>
44
45using namespace QV4;
46
47DEFINE_OBJECT_VTABLE(StringIteratorObject);
48
49void StringIteratorPrototype::init(ExecutionEngine *e)
50{
51 defineDefaultProperty(QStringLiteral("next"), code: method_next, argumentCount: 0);
52
53 Scope scope(e);
54 ScopedString val(scope, e->newString(s: QLatin1String("String Iterator")));
55 defineReadonlyConfigurableProperty(name: e->symbol_toStringTag(), value: val);
56}
57
58ReturnedValue StringIteratorPrototype::method_next(const FunctionObject *b, const Value *that, const Value *, int)
59{
60 Scope scope(b);
61 const StringIteratorObject *thisObject = that->as<StringIteratorObject>();
62 if (!thisObject)
63 return scope.engine->throwTypeError(message: QLatin1String("Not an String Iterator instance"));
64
65 ScopedString s(scope, thisObject->d()->iteratedString);
66 if (!s) {
67 QV4::Value undefined = Value::undefinedValue();
68 return IteratorPrototype::createIterResultObject(engine: scope.engine, value: undefined, done: true);
69 }
70
71 quint32 index = thisObject->d()->nextIndex;
72
73 QString str = s->toQString();
74 quint32 len = str.length();
75
76 if (index >= len) {
77 thisObject->d()->iteratedString.set(e: scope.engine, newVal: nullptr);
78 QV4::Value undefined = Value::undefinedValue();
79 return IteratorPrototype::createIterResultObject(engine: scope.engine, value: undefined, done: true);
80 }
81
82 QChar ch = str.at(i: index);
83 int num = 1;
84 if (ch.unicode() >= 0xd800 && ch.unicode() <= 0xdbff && index + 1 != len) {
85 ch = str.at(i: index + 1);
86 if (ch.unicode() >= 0xdc00 && ch.unicode() <= 0xdfff)
87 num = 2;
88 }
89
90 thisObject->d()->nextIndex += num;
91
92 ScopedString resultString(scope, scope.engine->newString(s: s->toQString().mid(position: index, n: num)));
93 return IteratorPrototype::createIterResultObject(engine: scope.engine, value: resultString, done: false);
94}
95
96

source code of qtdeclarative/src/qml/jsruntime/qv4stringiterator.cpp