assimp/code/AssetLib/Obj/ObjTools.h

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/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
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Copyright (c) 2006-2021, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the
following conditions are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other
materials provided with the distribution.
* Neither the name of the assimp team, nor the names of its
contributors may be used to endorse or promote products
derived from this software without specific prior
written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------
*/
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/** @file ObjTools.h
* @brief Some helpful templates for text parsing
*/
#ifndef OBJ_TOOLS_H_INC
#define OBJ_TOOLS_H_INC
#include <assimp/ParsingUtils.h>
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#include <assimp/fast_atof.h>
#include <vector>
namespace Assimp {
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/**
* @brief Returns true, if the last entry of the buffer is reached.
* @param[in] it Iterator of current position.
* @param[in] end Iterator with end of buffer.
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* @return true, if the end of the buffer is reached.
*/
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template <class char_t>
inline bool isEndOfBuffer(char_t it, char_t end) {
if (it == end) {
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return true;
}
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--end;
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return (it == end);
}
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/**
* @brief Returns next word separated by a space
* @param[in] pBuffer Pointer to data buffer
* @param[in] pEnd Pointer to end of buffer
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* @return Pointer to next space
*/
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template <class Char_T>
inline Char_T getNextWord(Char_T pBuffer, Char_T pEnd) {
while (!isEndOfBuffer(pBuffer, pEnd)) {
if (!IsSpaceOrNewLine(*pBuffer) || IsLineEnd(*pBuffer)) {
break;
}
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++pBuffer;
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}
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return pBuffer;
}
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/**
* @brief Returns pointer a next token
* @param[in] pBuffer Pointer to data buffer
* @param[in] pEnd Pointer to end of buffer
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* @return Pointer to next token
*/
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template <class Char_T>
inline Char_T getNextToken(Char_T pBuffer, Char_T pEnd) {
while (!isEndOfBuffer(pBuffer, pEnd)) {
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if (IsSpaceOrNewLine(*pBuffer)) {
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break;
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}
++pBuffer;
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}
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return getNextWord(pBuffer, pEnd);
}
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/**
* @brief Skips a line
* @param[in] it Iterator set to current position
* @param[in] end Iterator set to end of scratch buffer for readout
* @param[out] uiLine Current line number in format
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* @return Current-iterator with new position
*/
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template <class char_t>
inline char_t skipLine(char_t it, char_t end, unsigned int &uiLine) {
while (!isEndOfBuffer(it, end) && !IsLineEnd(*it)) {
++it;
}
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if (it != end) {
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++it;
++uiLine;
}
// fix .. from time to time there are spaces at the beginning of a material line
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while (it != end && (*it == '\t' || *it == ' ')) {
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++it;
}
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return it;
}
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/**
* @brief Get a name from the current line. Preserve space in the middle,
* but trim it at the end.
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* @param[in] it set to current position
* @param[in] end set to end of scratch buffer for readout
* @param[out] name Separated name
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* @return Current-iterator with new position
*/
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template <class char_t>
inline char_t getName(char_t it, char_t end, std::string &name) {
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name = "";
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if (isEndOfBuffer(it, end)) {
return end;
}
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char *pStart = &(*it);
while (!isEndOfBuffer(it, end) && !IsLineEnd(*it)) {
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++it;
}
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while (IsSpace(*it)) {
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--it;
}
// Get name
// if there is no name, and the previous char is a separator, come back to start
while (&(*it) < pStart) {
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++it;
}
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std::string strName(pStart, &(*it));
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if (!strName.empty()) {
name = strName;
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}
return it;
}
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/**
* @brief Get a name from the current line. Do not preserve space
* in the middle, but trim it at the end.
* @param it set to current position
* @param end set to end of scratch buffer for readout
* @param name Separated name
* @return Current-iterator with new position
*/
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template <class char_t>
inline char_t getNameNoSpace(char_t it, char_t end, std::string &name) {
name = "";
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if (isEndOfBuffer(it, end)) {
return end;
}
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char *pStart = &(*it);
while (!isEndOfBuffer(it, end) && !IsLineEnd(*it) && !IsSpaceOrNewLine(*it)) {
++it;
}
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while (isEndOfBuffer(it, end) || IsLineEnd(*it) || IsSpaceOrNewLine(*it)) {
--it;
}
++it;
// Get name
// if there is no name, and the previous char is a separator, come back to start
while (&(*it) < pStart) {
++it;
}
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std::string strName(pStart, &(*it));
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if (!strName.empty()) {
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name = strName;
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}
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return it;
}
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/**
* @brief Get next word from given line
* @param[in] it set to current position
* @param[in] end set to end of scratch buffer for readout
* @param[in] pBuffer Buffer for next word
* @param[in] length Buffer length
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* @return Current-iterator with new position
*/
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template <class char_t>
inline char_t CopyNextWord(char_t it, char_t end, char *pBuffer, size_t length) {
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size_t index = 0;
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it = getNextWord<char_t>(it, end);
while (!IsSpaceOrNewLine(*it) && !isEndOfBuffer(it, end)) {
pBuffer[index] = *it;
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++index;
if (index == length - 1) {
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break;
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}
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++it;
}
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pBuffer[index] = '\0';
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return it;
}
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/**
* @brief Get next float from given line
* @param[in] it set to current position
* @param[in] end set to end of scratch buffer for readout
* @param[out] value Separated float value.
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* @return Current-iterator with new position
*/
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template <class char_t>
inline char_t getFloat(char_t it, char_t end, ai_real &value) {
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static const size_t BUFFERSIZE = 1024;
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char buffer[BUFFERSIZE];
it = CopyNextWord<char_t>(it, end, buffer, BUFFERSIZE);
value = (ai_real)fast_atof(buffer);
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return it;
}
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/**
* @brief Will remove white-spaces for a string.
* @param[in] str The string to clean
* @return The trimmed string.
*/
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template <class string_type>
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inline string_type trim_whitespaces(string_type str) {
while (!str.empty() && IsSpace(str[0])) {
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str.erase(0);
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}
while (!str.empty() && IsSpace(str[str.length() - 1])) {
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str.erase(str.length() - 1);
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}
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return str;
}
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/**
* @brief Checks for a line-end.
* @param[in] it Current iterator in string.
* @param[in] end End of the string.
* @return The trimmed string.
*/
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template <class T>
bool hasLineEnd(T it, T end) {
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bool hasLineEnd = false;
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while (!isEndOfBuffer(it, end)) {
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++it;
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if (IsLineEnd(it)) {
hasLineEnd = true;
break;
}
}
return hasLineEnd;
}
} // Namespace Assimp
#endif // OBJ_TOOLS_H_INC