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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "addedfunction.h"
#include "addedfunction_p.h"
#include "typeparser.h"
#include <QtCore/QDebug>
using namespace Qt::StringLiterals;
constexpr auto callOperator = "operator()"_L1;
// Helpers to split a parameter list of <add-function>, <declare-function>
// (@ denoting names), like
// "void foo(QList<X,Y> &@list@ = QList<X,Y>{1,2}, int @b@=5, ...)"
namespace AddedFunctionParser {
QDebug operator<<(QDebug d, const Argument &a)
{
QDebugStateSaver saver(d);
d.noquote();
d.nospace();
d << "Argument(type=\"" << a.type << '"';
if (!a.name.isEmpty())
d << ", name=\"" << a.name << '"';
if (!a.defaultValue.isEmpty())
d << ", defaultValue=\"" << a.defaultValue << '"';
d << ')';
return d;
}
// Helper for finding the end of a function parameter, observing
// nested template parameters or lists.
static qsizetype parameterTokenEnd(qsizetype startPos, QStringView paramString)
{
const auto end = paramString.size();
int nestingLevel = 0;
for (qsizetype p = startPos; p < end; ++p) {
switch (paramString.at(p).toLatin1()) {
case ',':
if (nestingLevel == 0)
return p;
break;
case '<': // templates
case '{': // initializer lists of default values
case '(': // initialization, function pointers
case '[': // array dimensions
++nestingLevel;
break;
case '>':
case '}':
case ')':
case ']':
--nestingLevel;
break;
}
}
return end;
}
// Split a function parameter list into string tokens containing one
// parameters (including default value, etc).
static QList<QStringView> splitParameterTokens(QStringView paramString)
{
QList<QStringView> result;
qsizetype startPos = 0;
for ( ; startPos < paramString.size(); ) {
const auto end = parameterTokenEnd(startPos, paramString);
result.append(paramString.mid(startPos, end - startPos).trimmed());
startPos = end + 1;
}
return result;
}
// Split a function parameter list
Arguments splitParameters(QStringView paramString, QString *errorMessage)
{
Arguments result;
const QList<QStringView> tokens = splitParameterTokens(paramString);
for (const auto &t : tokens) {
Argument argument;
// Check defaultValue, "int @b@=5"
const auto equalPos = t.lastIndexOf(u'=');
if (equalPos != -1) {
const int defaultValuePos = equalPos + 1;
argument.defaultValue =
t.mid(defaultValuePos, t.size() - defaultValuePos).trimmed().toString();
}
QString typeString = (equalPos != -1 ? t.left(equalPos) : t).trimmed().toString();
// Check @name@
const auto atPos = typeString.indexOf(u'@');
if (atPos != -1) {
const int namePos = atPos + 1;
const int nameEndPos = typeString.indexOf(u'@', namePos);
if (nameEndPos == -1) {
if (errorMessage != nullptr) {
*errorMessage = u"Mismatched @ in \""_s
+ paramString.toString() + u'"';
}
return {};
}
argument.name = typeString.mid(namePos, nameEndPos - namePos).trimmed();
typeString.remove(atPos, nameEndPos - atPos + 1);
}
argument.type = typeString.trimmed();
result.append(argument);
}
return result;
}
} // namespace AddedFunctionParser
AddedFunction::AddedFunction(const QString &name, const QList<Argument> &arguments,
const TypeInfo &returnType) :
m_name(name),
m_arguments(arguments),
m_returnType(returnType)
{
}
AddedFunction::AddedFunctionPtr
AddedFunction::createAddedFunction(const QString &signatureIn, const QString &returnTypeIn,
QString *errorMessage)
{
errorMessage->clear();
QList<Argument> arguments;
const TypeInfo returnType = returnTypeIn.isEmpty()
? TypeInfo::voidType()
: TypeParser::parse(returnTypeIn, errorMessage);
if (!errorMessage->isEmpty())
return {};
QStringView signature = QStringView{signatureIn}.trimmed();
// Skip past "operator()(...)"
const auto parenSearchStartPos = signature.startsWith(callOperator)
? callOperator.size() : 0;
const auto openParenPos = signature.indexOf(u'(', parenSearchStartPos);
if (openParenPos < 0) {
return AddedFunctionPtr(new AddedFunction(signature.toString(),
arguments, returnType));
}
const QString name = signature.left(openParenPos).trimmed().toString();
const auto closingParenPos = signature.lastIndexOf(u')');
if (closingParenPos < 0) {
*errorMessage = u"Missing closing parenthesis"_s;
return {};
}
// Check for "foo() const"
bool isConst = false;
const auto signatureLength = signature.length();
const auto qualifierLength = signatureLength - closingParenPos - 1;
if (qualifierLength >= 5
&& signature.right(qualifierLength).contains(u"const")) {
isConst = true;
}
const auto paramString = signature.mid(openParenPos + 1, closingParenPos - openParenPos - 1);
const auto params = AddedFunctionParser::splitParameters(paramString, errorMessage);
if (params.isEmpty() && !errorMessage->isEmpty())
return {};
for (const auto &p : params) {
TypeInfo type = p.type == u"..."
? TypeInfo::varArgsType() : TypeParser::parse(p.type, errorMessage);
if (!errorMessage->isEmpty()) {
errorMessage->prepend(u"Unable to parse added function "_s + signatureIn
+ u": "_s);
return {};
}
arguments.append({type, p.name, p.defaultValue});
}
auto result = std::make_shared<AddedFunction>(name, arguments, returnType);
result->setConstant(isConst);
return result;
}
QDebug operator<<(QDebug d, const AddedFunction::Argument &a)
{
QDebugStateSaver saver(d);
d.noquote();
d.nospace();
d << "Argument(";
d << a.typeInfo;
if (!a.name.isEmpty())
d << ' ' << a.name;
if (!a.defaultValue.isEmpty())
d << " = " << a.defaultValue;
d << ')';
return d;
}
QDebug operator<<(QDebug d, const AddedFunction &af)
{
QDebugStateSaver saver(d);
d.noquote();
d.nospace();
d << "AddedFunction(";
if (af.access() == AddedFunction::Protected)
d << "protected";
if (af.isStatic())
d << " static";
d << af.returnType() << ' ' << af.name() << '(' << af.arguments() << ')';
if (af.isConstant())
d << " const";
if (af.isDeclaration())
d << " [declaration]";
return d;
}
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