assimp.assimp/code/ParsingUtils.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  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
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"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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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/


/** @file ParsingUtils.h
 *  @brief Defines helper functions for text parsing
 */
#ifndef AI_PARSING_UTILS_H_INC
#define AI_PARSING_UTILS_H_INC

#include "StringComparison.h"
#include "StringUtils.h"
#include <assimp/defs.h>

namespace Assimp {

// NOTE: the functions below are mostly intended as replacement for
// std::upper, std::lower, std::isupper, std::islower, std::isspace.
// we don't bother of locales. We don't want them. We want reliable
// (i.e. identical) results across all locales.

// The functions below accept any character type, but know only
// about ASCII. However, UTF-32 is the only safe ASCII superset to
// use since it doesn't have multi-byte sequences.

static const unsigned int BufferSize = 4096;

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE char_t ToLower( char_t in)
{
    return (in >= (char_t)'A' && in <= (char_t)'Z') ? (char_t)(in+0x20) : in;
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE char_t ToUpper( char_t in) {
    return (in >= (char_t)'a' && in <= (char_t)'z') ? (char_t)(in-0x20) : in;
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsUpper( char_t in)
{
    return (in >= (char_t)'A' && in <= (char_t)'Z');
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsLower( char_t in)
{
    return (in >= (char_t)'a' && in <= (char_t)'z');
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsSpace( char_t in)
{
    return (in == (char_t)' ' || in == (char_t)'\t');
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsLineEnd( char_t in)
{
    return (in==(char_t)'\r'||in==(char_t)'\n'||in==(char_t)'\0'||in==(char_t)'\f');
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsSpaceOrNewLine( char_t in)
{
    return IsSpace<char_t>(in) || IsLineEnd<char_t>(in);
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipSpaces( const char_t* in, const char_t** out)
{
    while( *in == ( char_t )' ' || *in == ( char_t )'\t' ) {
        ++in;
    }
    *out = in;
    return !IsLineEnd<char_t>(*in);
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipSpaces( const char_t** inout)
{
    return SkipSpaces<char_t>(*inout,inout);
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipLine( const char_t* in, const char_t** out)
{
    while( *in != ( char_t )'\r' && *in != ( char_t )'\n' && *in != ( char_t )'\0' ) {
        ++in;
    }

    // files are opened in binary mode. Ergo there are both NL and CR
    while( *in == ( char_t )'\r' || *in == ( char_t )'\n' ) {
        ++in;
    }
    *out = in;
    return *in != (char_t)'\0';
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipLine( const char_t** inout)
{
    return SkipLine<char_t>(*inout,inout);
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipSpacesAndLineEnd( const char_t* in, const char_t** out)
{
    while( *in == ( char_t )' ' || *in == ( char_t )'\t' || *in == ( char_t )'\r' || *in == ( char_t )'\n' ) {
        ++in;
    }
    *out = in;
    return *in != '\0';
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool SkipSpacesAndLineEnd( const char_t** inout)
{
    return SkipSpacesAndLineEnd<char_t>(*inout,inout);
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool GetNextLine( const char_t*& buffer, char_t out[ BufferSize ] )
{
    if( ( char_t )'\0' == *buffer ) {
        return false;
    }

    char* _out = out;
    char* const end = _out + BufferSize;
    while( !IsLineEnd( *buffer ) && _out < end ) {
        *_out++ = *buffer++;
    }
    *_out = (char_t)'\0';

    while( IsLineEnd( *buffer ) && '\0' != *buffer ) {
        ++buffer;
    }

    return true;
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool IsNumeric( char_t in)
{
    return ( in >= '0' && in <= '9' ) || '-' == in || '+' == in;
}

// ---------------------------------------------------------------------------------
template <class char_t>
AI_FORCE_INLINE bool TokenMatch(char_t*& in, const char* token, unsigned int len)
{
    if (!::strncmp(token,in,len) && IsSpaceOrNewLine(in[len])) {
        if (in[len] != '\0') {
            in += len+1;
        } else {
            // If EOF after the token make sure we don't go past end of buffer
            in += len;
        }
        return true;
    }

    return false;
}
// ---------------------------------------------------------------------------------
/** @brief Case-ignoring version of TokenMatch
 *  @param in Input
 *  @param token Token to check for
 *  @param len Number of characters to check
 */
AI_FORCE_INLINE bool TokenMatchI(const char*& in, const char* token, unsigned int len)
{
    if (!ASSIMP_strincmp(token,in,len) && IsSpaceOrNewLine(in[len])) {
        in += len+1;
        return true;
    }
    return false;
}
// ---------------------------------------------------------------------------------
AI_FORCE_INLINE void SkipToken(const char*& in)
{
    SkipSpaces(&in);
    while (!IsSpaceOrNewLine(*in))++in;
}
// ---------------------------------------------------------------------------------
AI_FORCE_INLINE std::string GetNextToken(const char*& in)
{
    SkipSpacesAndLineEnd(&in);
    const char* cur = in;
    while (!IsSpaceOrNewLine(*in))++in;
    return std::string(cur,(size_t)(in-cur));
}

// ---------------------------------------------------------------------------------

} // ! namespace Assimp

#endif // ! AI_PARSING_UTILS_H_INC