qqmljsast.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QString>
#include <QLocale>
#include "common/qqmljssourcelocation_p.h"
#include "qqmljsast_p.h"
 
#include "qqmljsastvisitor_p.h"
#include <qlocale.h>
 
#include <algorithm>
#include <array>
 
QT_BEGIN_NAMESPACE
 
namespace QQmlJS { namespace AST {
 
FunctionExpression *asAnonymousFunctionDefinition(Node *n)
{
    if (!n)
        return nullptr;
    FunctionExpression *f = n->asFunctionDefinition();
    if (!f || !f->name.isNull())
        return nullptr;
    return f;
}
 
ClassExpression *asAnonymousClassDefinition(Node *n)
{
    if (!n)
        return nullptr;
    ClassExpression *c = n->asClassDefinition();
    if (!c || !c->name.isNull())
        return nullptr;
    return c;
}
 
ExpressionNode *Node::expressionCast()
{
    return nullptr;
}
 
BinaryExpression *Node::binaryExpressionCast()
{
    return nullptr;
}
 
Statement *Node::statementCast()
{
    return nullptr;
}
 
UiObjectMember *Node::uiObjectMemberCast()
{
    return nullptr;
}
 
LeftHandSideExpression *Node::leftHandSideExpressionCast()
{
    return nullptr;
}
 
Pattern *Node::patternCast()
{
    return nullptr;
}
 
FunctionExpression *Node::asFunctionDefinition()
{
    return nullptr;
}
 
ClassExpression *Node::asClassDefinition()
{
    return nullptr;
}
 
bool Node::ignoreRecursionDepth() const
{
    static const bool doIgnore = qEnvironmentVariableIsSet("QV4_CRASH_ON_STACKOVERFLOW");
    return doIgnore;
}
 
ExpressionNode *ExpressionNode::expressionCast()
{
    return this;
}
 
bool ExpressionNode::containsOptionalChain() const
{
    for (const Node *node = this;;) {
        switch (node->kind) {
        case Kind_FieldMemberExpression: {
            const auto *fme = AST::cast<const FieldMemberExpression*>(node);
            if (fme->isOptional)
                return true;
            node = fme->base;
            break;
        }
        case Kind_ArrayMemberExpression: {
            const auto *ame = AST::cast<const ArrayMemberExpression*>(node);
            if (ame->isOptional)
                return true;
            node = ame->base;
            break;
        }
        case Kind_CallExpression: {
            const auto *ce = AST::cast<const CallExpression*>(node);
            if (ce->isOptional)
                return true;
            node = ce->base;
            break;
        }
        case Kind_NestedExpression: {
            const auto *ne = AST::cast<const NestedExpression*>(node);
            node = ne->expression;
            break;
        }
        default:
            // These unhandled nodes lead to invalid lvalues anyway, so they do not need to be handled here.
            return false;
        }
    }
    return false;
}
 
FormalParameterList *ExpressionNode::reparseAsFormalParameterList(MemoryPool *pool)
{
    AST::ExpressionNode *expr = this;
    AST::FormalParameterList *f = nullptr;
    if (AST::Expression *commaExpr = AST::cast<AST::Expression *>(expr)) {
        f = commaExpr->left->reparseAsFormalParameterList(pool);
        if (!f)
            return nullptr;
 
        expr = commaExpr->right;
    }
 
    AST::ExpressionNode *rhs = nullptr;
    if (AST::BinaryExpression *assign = AST::cast<AST::BinaryExpression *>(expr)) {
            if (assign->op != QSOperator::Assign)
                return nullptr;
        expr = assign->left;
        rhs = assign->right;
    }
    AST::PatternElement *binding = nullptr;
    if (AST::IdentifierExpression *idExpr = AST::cast<AST::IdentifierExpression *>(expr)) {
        binding = new (pool) AST::PatternElement(idExpr->name, /*type annotation*/nullptr, rhs);
        binding->identifierToken = idExpr->identifierToken;
    } else if (AST::Pattern *p = expr->patternCast()) {
        SourceLocation loc;
        QString s;
        if (!p->convertLiteralToAssignmentPattern(pool, &loc, &s))
            return nullptr;
        binding = new (pool) AST::PatternElement(p, rhs);
        binding->identifierToken = p->firstSourceLocation();
    }
    if (!binding)
        return nullptr;
    return new (pool) AST::FormalParameterList(f, binding);
}
 
BinaryExpression *BinaryExpression::binaryExpressionCast()
{
    return this;
}
 
void TypeExpression::accept0(BaseVisitor *visitor)
{
    visitor->visit(this);
    visitor->endVisit(this);
}
 
Statement *Statement::statementCast()
{
    return this;
}
 
UiObjectMember *UiObjectMember::uiObjectMemberCast()
{
    return this;
}
 
void NestedExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
    visitor->endVisit(this);
}
 
FunctionExpression *NestedExpression::asFunctionDefinition()
{
    return expression->asFunctionDefinition();
}
 
ClassExpression *NestedExpression::asClassDefinition()
{
    return expression->asClassDefinition();
}
 
void ThisExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void IdentifierExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void NullExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void TrueLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void FalseLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void SuperLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
 
void StringLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void TemplateLiteral::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (TemplateLiteral *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        visitor->endVisit(it);
    }
}
 
void NumericLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void RegExpLiteral::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void ArrayPattern::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this))
        accept(elements, visitor);
 
    visitor->endVisit(this);
}
 
bool ArrayPattern::isValidArrayLiteral(SourceLocation *errorLocation) const {
    for (PatternElementList *it = elements; it != nullptr; it = it->next) {
        PatternElement *e = it->element;
        if (e && e->bindingTarget != nullptr) {
            if (errorLocation)
                *errorLocation = e->firstSourceLocation();
            return false;
        }
    }
    return true;
}
 
void ObjectPattern::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(properties, visitor);
    }
 
    visitor->endVisit(this);
}
 
/*
  This is the grammar for AssignmentPattern that we need to convert the literal to:
 
    AssignmentPattern:
        ObjectAssignmentPattern
        ArrayAssignmentPattern
    ArrayAssignmentPattern:
        [ ElisionOpt AssignmentRestElementOpt ]
        [ AssignmentElementList ]
        [ AssignmentElementList , ElisionOpt AssignmentRestElementOpt ]
    AssignmentElementList:
        AssignmentElisionElement
        AssignmentElementList , AssignmentElisionElement
    AssignmentElisionElement:
        ElisionOpt AssignmentElement
    AssignmentRestElement:
        ... DestructuringAssignmentTarget
 
    ObjectAssignmentPattern:
        {}
        { AssignmentPropertyList }
        { AssignmentPropertyList, }
    AssignmentPropertyList:
        AssignmentProperty
        AssignmentPropertyList , AssignmentProperty
    AssignmentProperty:
        IdentifierReference InitializerOpt_In
    PropertyName:
        AssignmentElement
 
    AssignmentElement:
        DestructuringAssignmentTarget InitializerOpt_In
    DestructuringAssignmentTarget:
        LeftHandSideExpression
 
  It was originally parsed with the following grammar:
 
ArrayLiteral:
    [ ElisionOpt ]
    [ ElementList ]
    [ ElementList , ElisionOpt ]
ElementList:
    ElisionOpt AssignmentExpression_In
    ElisionOpt SpreadElement
    ElementList , ElisionOpt AssignmentExpression_In
    ElementList , Elisionopt SpreadElement
SpreadElement:
    ... AssignmentExpression_In
ObjectLiteral:
    {}
    { PropertyDefinitionList }
    { PropertyDefinitionList , }
PropertyDefinitionList:
    PropertyDefinition
    PropertyDefinitionList , PropertyDefinition
PropertyDefinition:
    IdentifierReference
    CoverInitializedName
    PropertyName : AssignmentExpression_In
    MethodDefinition
PropertyName:
    LiteralPropertyName
    ComputedPropertyName
 
*/
bool ArrayPattern::convertLiteralToAssignmentPattern(MemoryPool *pool, SourceLocation *errorLocation, QString *errorMessage)
{
    if (parseMode == Binding)
        return true;
    for (auto *it = elements; it; it = it->next) {
        if (!it->element)
            continue;
        if (it->element->type == PatternElement::SpreadElement && it->next) {
            *errorLocation = it->element->firstSourceLocation();
            *errorMessage = QString::fromLatin1("'...' can only appear as last element in a destructuring list.");
            return false;
        }
        if (!it->element->convertLiteralToAssignmentPattern(pool, errorLocation, errorMessage))
            return false;
    }
    parseMode = Binding;
    return true;
}
 
bool ObjectPattern::convertLiteralToAssignmentPattern(MemoryPool *pool, SourceLocation *errorLocation, QString *errorMessage)
{
    if (parseMode == Binding)
        return true;
    for (auto *it = properties; it; it = it->next) {
        if (!it->property->convertLiteralToAssignmentPattern(pool, errorLocation, errorMessage))
            return false;
    }
    parseMode = Binding;
    return true;
}
 
bool PatternElement::convertLiteralToAssignmentPattern(MemoryPool *pool, SourceLocation *errorLocation, QString *errorMessage)
{
    Q_ASSERT(type == Literal || type == SpreadElement);
    Q_ASSERT(bindingIdentifier.isNull());
    Q_ASSERT(bindingTarget == nullptr);
    Q_ASSERT(bindingTarget == nullptr);
    Q_ASSERT(initializer);
    ExpressionNode *init = initializer;
 
    initializer = nullptr;
    LeftHandSideExpression *lhs = init->leftHandSideExpressionCast();
    if (type == SpreadElement) {
        if (!lhs) {
            *errorLocation = init->firstSourceLocation();
            *errorMessage = QString::fromLatin1("Invalid lhs expression after '...' in destructuring expression.");
            return false;
        }
    } else {
        type = PatternElement::Binding;
 
        if (BinaryExpression *b = init->binaryExpressionCast()) {
            if (b->op != QSOperator::Assign) {
                *errorLocation = b->operatorToken;
                *errorMessage = QString::fromLatin1("Invalid assignment operation in destructuring expression");
                return false;
            }
            lhs = b->left->leftHandSideExpressionCast();
            initializer = b->right;
            Q_ASSERT(lhs);
        } else {
            lhs = init->leftHandSideExpressionCast();
        }
        if (!lhs) {
            *errorLocation = init->firstSourceLocation();
            *errorMessage = QString::fromLatin1("Destructuring target is not a left hand side expression.");
            return false;
        }
    }
 
    if (auto *i = cast<IdentifierExpression *>(lhs)) {
        bindingIdentifier = i->name;
        identifierToken = i->identifierToken;
        return true;
    }
 
    bindingTarget = lhs;
    if (auto *p = lhs->patternCast()) {
        if (!p->convertLiteralToAssignmentPattern(pool, errorLocation, errorMessage))
            return false;
    }
    return true;
}
 
bool PatternProperty::convertLiteralToAssignmentPattern(MemoryPool *pool, SourceLocation *errorLocation, QString *errorMessage)
{
    Q_ASSERT(type != SpreadElement);
    if (type == Binding)
        return true;
    if (type == Getter || type == Setter) {
        *errorLocation = firstSourceLocation();
        *errorMessage = QString::fromLatin1("Invalid getter/setter in destructuring expression.");
        return false;
    }
    if (type == Method)
        type = Literal;
    Q_ASSERT(type == Literal);
    return PatternElement::convertLiteralToAssignmentPattern(pool, errorLocation, errorMessage);
}
 
 
void Elision::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // ###
    }
 
    visitor->endVisit(this);
}
 
void IdentifierPropertyName::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void StringLiteralPropertyName::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void NumericLiteralPropertyName::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
namespace {
struct LocaleWithoutZeroPadding : public QLocale
{
    LocaleWithoutZeroPadding()
        : QLocale(QLocale::C)
    {
        setNumberOptions(QLocale::OmitLeadingZeroInExponent | QLocale::OmitGroupSeparator);
    }
};
}
 
QString NumericLiteralPropertyName::asString()const
{
    // Can't use QString::number here anymore as it does zero padding by default now.
 
    // In C++11 this initialization is thread-safe (6.7 [stmt.dcl] p4)
    static LocaleWithoutZeroPadding locale;
    // Because of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83562 we can't use thread_local
    // for the locale variable and therefore rely on toString(double) to be thread-safe.
    return locale.toString(id, 'g', 16);
}
 
void ArrayMemberExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void FieldMemberExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
    }
 
    visitor->endVisit(this);
}
 
void NewMemberExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
        accept(arguments, visitor);
    }
 
    visitor->endVisit(this);
}
 
void NewExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void CallExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
        accept(arguments, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ArgumentList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (ArgumentList *it = this; it; it = it->next) {
            accept(it->expression, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void PostIncrementExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PostDecrementExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
    }
 
    visitor->endVisit(this);
}
 
void DeleteExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void VoidExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void TypeOfExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PreIncrementExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PreDecrementExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UnaryPlusExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UnaryMinusExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void TildeExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void NotExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void BinaryExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(left, visitor);
        accept(right, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ConditionalExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(ok, visitor);
        accept(ko, visitor);
    }
 
    visitor->endVisit(this);
}
 
void Expression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(left, visitor);
        accept(right, visitor);
    }
 
    visitor->endVisit(this);
}
 
void Block::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statements, visitor);
    }
 
    visitor->endVisit(this);
}
 
void StatementList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (StatementList *it = this; it; it = it->next) {
            accept(it->statement, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void VariableStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(declarations, visitor);
    }
 
    visitor->endVisit(this);
}
 
void VariableDeclarationList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (VariableDeclarationList *it = this; it; it = it->next) {
            accept(it->declaration, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void EmptyStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void ExpressionStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void IfStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(ok, visitor);
        accept(ko, visitor);
    }
 
    visitor->endVisit(this);
}
 
void DoWhileStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statement, visitor);
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void WhileStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ForStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(initialiser, visitor);
        accept(declarations, visitor);
        accept(condition, visitor);
        accept(expression, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ForEachStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(lhs, visitor);
        accept(expression, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ContinueStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void BreakStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void ReturnStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void YieldExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
 
void WithStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void SwitchStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(block, visitor);
    }
 
    visitor->endVisit(this);
}
 
void CaseBlock::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(clauses, visitor);
        accept(defaultClause, visitor);
        accept(moreClauses, visitor);
    }
 
    visitor->endVisit(this);
}
 
void CaseClauses::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (CaseClauses *it = this; it; it = it->next) {
            accept(it->clause, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void CaseClause::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
        accept(statements, visitor);
    }
 
    visitor->endVisit(this);
}
 
void DefaultClause::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statements, visitor);
    }
 
    visitor->endVisit(this);
}
 
void LabelledStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ThrowStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void TryStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statement, visitor);
        accept(catchExpression, visitor);
        accept(finallyExpression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void Catch::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(patternElement, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void Finally::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void FunctionDeclaration::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(formals, visitor);
        accept(typeAnnotation, visitor);
        accept(body, visitor);
    }
 
    visitor->endVisit(this);
}
 
void FunctionExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(formals, visitor);
        accept(typeAnnotation, visitor);
        accept(body, visitor);
    }
 
    visitor->endVisit(this);
}
 
FunctionExpression *FunctionExpression::asFunctionDefinition()
{
    return this;
}
 
BoundNames FormalParameterList::formals() const
{
    BoundNames formals;
    int i = 0;
    for (const FormalParameterList *it = this; it; it = it->next) {
        if (it->element) {
            QString name = it->element->bindingIdentifier.toString();
            int duplicateIndex = formals.indexOf(name);
            if (duplicateIndex >= 0) {
                // change the name of the earlier argument to enforce the lookup semantics from the spec
                formals[duplicateIndex].id += QLatin1String("#") + QString::number(i);
            }
            formals += { name, it->element->firstSourceLocation(), it->element->typeAnnotation,
                         it->element->isInjectedSignalParameter ? BoundName::Injected
                                                                : BoundName::Declared };
        }
        ++i;
    }
    return formals;
}
 
BoundNames FormalParameterList::boundNames() const
{
    BoundNames names;
    for (const FormalParameterList *it = this; it; it = it->next) {
        if (it->element)
            it->element->boundNames(&names);
    }
    return names;
}
 
void FormalParameterList::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (FormalParameterList *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        if (accepted)
            accept(it->element, visitor);
        visitor->endVisit(it);
    }
}
 
FormalParameterList *FormalParameterList::finish(QQmlJS::MemoryPool *pool)
{
    FormalParameterList *front = next;
    next = nullptr;
 
    int i = 0;
    for (const FormalParameterList *it = this; it; it = it->next) {
        if (it->element && it->element->bindingIdentifier.isEmpty())
            it->element->bindingIdentifier = pool->newString(QLatin1String("arg#") + QString::number(i));
        ++i;
    }
    return front;
}
 
void Program::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(statements, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ImportSpecifier::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
 
    }
    visitor->endVisit(this);
}
 
void ImportsList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (ImportsList *it = this; it; it = it->next) {
            accept(it->importSpecifier, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void NamedImports::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(importsList, visitor);
    }
 
    visitor->endVisit(this);
}
 
void FromClause::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void NameSpaceImport::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void ImportClause::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(nameSpaceImport, visitor);
        accept(namedImports, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ImportDeclaration::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(importClause, visitor);
        accept(fromClause, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ExportSpecifier::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
 
    }
 
    visitor->endVisit(this);
}
 
void ExportsList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (ExportsList *it = this; it; it = it->next) {
            accept(it->exportSpecifier, visitor);
        }
    }
 
    visitor->endVisit(this);
}
 
void ExportClause::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(exportsList, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ExportDeclaration::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(fromClause, visitor);
        accept(exportClause, visitor);
        accept(variableStatementOrDeclaration, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ESModule::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(body, visitor);
    }
 
    visitor->endVisit(this);
}
 
void DebuggerStatement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void UiProgram::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(headers, visitor);
        accept(members, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiPublicMember::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        // accept(memberType, visitor); // accept manually in visit if interested
        accept(statement, visitor);
        accept(binding, visitor);
        // accept(parameters, visitor); // accept manually in visit if interested
    }
 
    visitor->endVisit(this);
}
 
void UiObjectDefinition::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(qualifiedTypeNameId, visitor);
        accept(initializer, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiObjectInitializer::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(members, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiParameterList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(type, visitor); // accept manually in visit if interested
    }
    visitor->endVisit(this);
}
 
void UiObjectBinding::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(qualifiedId, visitor);
        accept(qualifiedTypeNameId, visitor);
        accept(initializer, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiScriptBinding::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(qualifiedId, visitor);
        accept(statement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiArrayBinding::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(qualifiedId, visitor);
        accept(members, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiObjectMemberList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (UiObjectMemberList *it = this; it; it = it->next)
            accept(it->member, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiArrayMemberList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (UiArrayMemberList *it = this; it; it = it->next)
            accept(it->member, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiQualifiedId::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(next, visitor) // accept manually in visit if interested
    }
 
    visitor->endVisit(this);
}
 
void Type::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(typeId, visitor);
        accept(typeArgument, visitor);
    }
 
    visitor->endVisit(this);
}
 
void TypeAnnotation::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(type, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiImport::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(importUri, visitor);
        // accept(version, visitor); // accept manually in visit if interested
    }
 
    visitor->endVisit(this);
}
 
void UiPragmaValueList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
 
void UiPragma::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void UiHeaderItemList::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (UiHeaderItemList *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        if (accepted)
            accept(it->headerItem, visitor);
 
        visitor->endVisit(it);
    }
}
 
 
void UiSourceElement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(sourceElement, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiEnumDeclaration::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(members, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiEnumMemberList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void TaggedTemplate::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(base, visitor);
        accept(templateLiteral, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PatternElement::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(bindingTarget, visitor);
        accept(typeAnnotation, visitor);
        accept(initializer, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PatternElement::boundNames(BoundNames *names)
{
    if (bindingTarget) {
        if (PatternElementList *e = elementList())
            e->boundNames(names);
        else if (PatternPropertyList *p = propertyList())
            p->boundNames(names);
    } else {
        names->append({ bindingIdentifier.toString(), firstSourceLocation(), typeAnnotation,
                        isInjectedSignalParameter ? BoundName::Injected : BoundName::Declared });
    }
}
 
void PatternElementList::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (PatternElementList *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        if (accepted) {
            accept(it->elision, visitor);
            accept(it->element, visitor);
        }
        visitor->endVisit(it);
    }
}
 
void PatternElementList::boundNames(BoundNames *names)
{
    for (PatternElementList *it = this; it; it = it->next) {
        if (it->element)
            it->element->boundNames(names);
    }
}
 
void PatternProperty::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(name, visitor);
        accept(bindingTarget, visitor);
        accept(typeAnnotation, visitor);
        accept(initializer, visitor);
    }
 
    visitor->endVisit(this);
}
 
void PatternProperty::boundNames(BoundNames *names)
{
    PatternElement::boundNames(names);
}
 
void PatternPropertyList::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (PatternPropertyList *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        if (accepted)
            accept(it->property, visitor);
        visitor->endVisit(it);
    }
}
 
void PatternPropertyList::boundNames(BoundNames *names)
{
    for (PatternPropertyList *it = this; it; it = it->next)
        it->property->boundNames(names);
}
 
void ComputedPropertyName::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(expression, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ClassExpression::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(heritage, visitor);
        accept(elements, visitor);
    }
 
    visitor->endVisit(this);
}
 
ClassExpression *ClassExpression::asClassDefinition()
{
    return this;
}
 
void ClassDeclaration::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(heritage, visitor);
        accept(elements, visitor);
    }
 
    visitor->endVisit(this);
}
 
void ClassElementList::accept0(BaseVisitor *visitor)
{
    bool accepted = true;
    for (ClassElementList *it = this; it && accepted; it = it->next) {
        accepted = visitor->visit(it);
        if (accepted)
            accept(it->property, visitor);
 
        visitor->endVisit(it);
    }
}
 
ClassElementList *ClassElementList::finish()
{
    ClassElementList *front = next;
    next = nullptr;
    return front;
}
 
Pattern *Pattern::patternCast()
{
    return this;
}
 
LeftHandSideExpression *LeftHandSideExpression::leftHandSideExpressionCast()
{
    return this;
}
 
void UiVersionSpecifier::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
    visitor->endVisit(this);
}
 
QString Type::toString() const
{
    QString result;
    toString(&result);
    return result;
}
 
void Type::toString(QString *out) const
{
    typeId->toString(out);
 
    if (typeArgument) {
        out->append(QLatin1Char('<'));
        typeArgument->toString(out);
        out->append(QLatin1Char('>'));
    };
}
 
void UiInlineComponent::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        // accept(annotations, visitor); // accept manually in visit if interested
        accept(component, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiRequired::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
    }
 
    visitor->endVisit(this);
}
 
void UiAnnotationList::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        for (UiAnnotationList *it = this; it; it = it->next)
            accept(it->annotation, visitor);
    }
 
    visitor->endVisit(this);
}
 
void UiAnnotation::accept0(BaseVisitor *visitor)
{
    if (visitor->visit(this)) {
        accept(qualifiedTypeNameId, visitor);
        accept(initializer, visitor);
    }
 
    visitor->endVisit(this);
}
 
SourceLocation UiPropertyAttributes::firstSourceLocation() const
{
    std::array<const SourceLocation *, 4> tokens {&m_propertyToken, &m_defaultToken, &m_readonlyToken, &m_requiredToken};
    const auto it = std::min_element(tokens.begin(), tokens.end(), compareLocationsByBegin<true>);
    return **it;
}
 
SourceLocation UiPropertyAttributes::lastSourceLocation() const
{
    std::array<const SourceLocation *, 4> tokens {&m_propertyToken, &m_defaultToken, &m_readonlyToken, &m_requiredToken};
    const auto it = std::max_element(tokens.begin(), tokens.end(), compareLocationsByBegin<false>);
    return **it;
}
 
} } // namespace QQmlJS::AST
 
QT_END_NAMESPACE