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/****************************************************************************
**
** Copyright (C) 1993-2009 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_FOUNDATION_STRING_CONVERSION_H
#define QT3DS_FOUNDATION_STRING_CONVERSION_H
#include "foundation/Qt3DSSimpleTypes.h"
#include "foundation/Qt3DSMemoryBuffer.h"
#include "foundation/Qt3DSAllocator.h"
#include "foundation/Utils.h"
namespace qt3ds {
namespace foundation {
// Template base class so that we can convert items to and from char* and wchar_t*
// representations
template <typename TDataType>
struct StringConversion
{
bool force_compile_error;
};
// Write the char8_t but exlude the null terminator
// Meant to write data model values.
// Memory buffer contains a non-null-terminated
// char8_t string
struct Char8TWriter
{
MemoryBuffer<ForwardingAllocator> &m_Buffer;
Char8TWriter(MemoryBuffer<ForwardingAllocator> &buf)
: m_Buffer(buf)
{
}
void Write(const char8_t *value, QT3DSU32 len = 0)
{
if (isTrivial(value))
return;
if (len == 0)
len = (QT3DSU32)StrLen(value);
m_Buffer.write(value, len);
}
void Write(char8_t value) { m_Buffer.write(value); }
void Write(bool value) { Write(value ? "True" : "False"); }
// Takes care of long and float
template <typename TDataType>
void Write(TDataType value)
{
char8_t buf[256];
QT3DSU32 numWritten =
StringConversion<TDataType>().ToStr(value, NVDataRef<char8_t>(buf, 256));
if (numWritten)
Write((const char8_t *)buf);
else {
QT3DS_ASSERT(false);
}
}
template <typename TDataType>
void Write(NVConstDataRef<TDataType> values, QT3DSU32 grouping = 6, QT3DSU32 tabCount = 0)
{
for (QT3DSU32 idx = 0; idx < values.size(); ++idx) {
if (idx) {
if ((idx % grouping) == 0) {
Write((char8_t)'\n');
for (QT3DSU32 tabIdx = 0; tabIdx < tabCount; ++tabIdx)
Write((char8_t)'\t');
} else
Write((char8_t)' ');
}
Write(values[idx]);
}
}
void Write(NVConstDataRef<char8_t> values, QT3DSU32 ignored = 6)
{
(void)ignored;
if (values.size() && values[0] != 0) {
QT3DSU32 lastItem = values.size() - 1;
if (values[lastItem] == 0)
--lastItem;
Write(values.begin(), lastItem + 1);
}
}
};
inline bool IsWhite(char8_t value)
{
return value == '\n' || value == '\r' || value == ' ' || value == '\t';
}
// skip until we find whitespace.
inline char8_t *FindNextWhitespace(char8_t *input)
{
if (input == NULL)
return input;
char8_t *marker = input;
// Empty loop intentional
for (; *marker && !IsWhite(*marker); ++marker)
;
return marker;
}
// skip until we find something that isn't whitespace.
inline char8_t *FindNextNonWhitespace(char8_t *input)
{
if (input == NULL)
return input;
char8_t *marker = input;
// Empty loop intentional
for (; *marker && IsWhite(*marker); ++marker)
;
return marker;
}
// Reading is destructive in the case of floating point lists, so we may
// destroy the incoming string.
// We are assuming the string is null-terminated at end ptr.
struct Char8TReader
{
char8_t *m_StartPtr;
// Buffer used for temp storage
MemoryBuffer<ForwardingAllocator> &m_Buffer;
Char8TReader(char8_t *sp, MemoryBuffer<ForwardingAllocator> &buf)
: m_StartPtr(sp)
, m_Buffer(buf)
{
}
void Read(const char8_t *&outPtr) { outPtr = m_StartPtr; }
template <typename TDataType>
void Read(TDataType &data)
{
bool success = StringConversion<TDataType>().StrTo(m_StartPtr, data);
QT3DS_ASSERT(success);
(void)success;
}
// Destructive operation because we can't trust
// strtod to do the right thing. On windows, for long strings,
// it calls strlen every operation thus leading to basically N^2
// behavior
template <typename TDataType>
void ReadRef(NVDataRef<TDataType> data)
{
QT3DSU32 idx = 0;
m_StartPtr = FindNextNonWhitespace(m_StartPtr);
for (; idx < data.size() && m_StartPtr && *m_StartPtr; ++idx) {
char8_t *nextPtr = FindNextWhitespace(m_StartPtr);
if (nextPtr && *nextPtr)
*nextPtr = 0;
else
nextPtr = NULL;
StringConversion<TDataType>().StrTo(m_StartPtr, data[idx]);
m_StartPtr = nextPtr;
if (m_StartPtr)
m_StartPtr = FindNextNonWhitespace(m_StartPtr + 1);
}
QT3DS_ASSERT(idx == data.size());
}
void ReadBuffer(NVConstDataRef<char8_t> &outBuffer)
{
if (m_StartPtr && *m_StartPtr) {
QT3DSU32 len = (QT3DSU32)strlen(m_StartPtr);
outBuffer = NVConstDataRef<char8_t>(m_StartPtr, len + 1);
}
}
// Destructive operation because we can't trust
// strtod to do the right thing. On windows, for long strings,
// it calls strlen every operation thus leading to basically N^2
// behavior
template <typename TDataType>
void ReadBuffer(NVConstDataRef<TDataType> &outBuffer)
{
m_Buffer.clear();
m_StartPtr = FindNextNonWhitespace(m_StartPtr);
while (m_StartPtr && *m_StartPtr) {
char8_t *nextPtr = FindNextWhitespace(m_StartPtr);
if (nextPtr && *nextPtr)
*nextPtr = 0;
else
nextPtr = NULL;
TDataType temp;
StringConversion<TDataType>().StrTo(m_StartPtr, temp);
m_Buffer.write(temp);
m_StartPtr = nextPtr;
if (m_StartPtr)
m_StartPtr = FindNextNonWhitespace(m_StartPtr + 1);
}
QT3DSU32 numItems = m_Buffer.size() / sizeof(TDataType);
if (numItems)
outBuffer = NVConstDataRef<TDataType>((TDataType *)m_Buffer.begin(), numItems);
else
outBuffer = NVConstDataRef<TDataType>();
}
};
}
}
#endif
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