LineSplitter.h

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/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
 
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All rights reserved.
 
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* 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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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/
 
#pragma once
#ifndef INCLUDED_LINE_SPLITTER_H
#define INCLUDED_LINE_SPLITTER_H
 
#ifdef __GNUC__
#   pragma GCC system_header
#endif
 
#include <stdexcept>
#include <assimp/StreamReader.h>
#include <assimp/ParsingUtils.h>
 
namespace Assimp {
 
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
class LineSplitter {
public:
    typedef size_t line_idx;
 
    // -----------------------------------------
    LineSplitter(StreamReaderLE& stream, bool skip_empty_lines = true, bool trim = true);
 
    ~LineSplitter();
 
    // -----------------------------------------
    LineSplitter& operator++();
 
    // -----------------------------------------
    LineSplitter& operator++(int);
 
    // -----------------------------------------
    const char* operator[] (size_t idx) const;
 
    // -----------------------------------------
    template <size_t N>
    void get_tokens(const char* (&tokens)[N]) const;
 
    // -----------------------------------------
    const std::string* operator -> () const;
 
    std::string operator* () const;
 
    // -----------------------------------------
    operator bool() const;
 
    // -----------------------------------------
    operator line_idx() const;
 
    line_idx get_index() const;
 
    // -----------------------------------------
    StreamReaderLE& get_stream();
 
    // -----------------------------------------
    bool match_start(const char* check);
 
    // -----------------------------------------
    void swallow_next_increment();
 
    LineSplitter( const LineSplitter & ) = delete;
    LineSplitter(LineSplitter &&) = delete;
    LineSplitter &operator = ( const LineSplitter & ) = delete;
 
private:
    line_idx mIdx;
    std::string mCur;
    StreamReaderLE& mStream;
    bool mSwallow, mSkip_empty_lines, mTrim;
};
 
AI_FORCE_INLINE
LineSplitter::LineSplitter(StreamReaderLE& stream, bool skip_empty_lines, bool trim )
: mIdx(0)
, mCur()
, mStream(stream)
, mSwallow()
, mSkip_empty_lines(skip_empty_lines)
, mTrim(trim) {
    mCur.reserve(1024);
    operator++();
    mIdx = 0;
}
 
AI_FORCE_INLINE
LineSplitter::~LineSplitter() {
    // empty
}
 
AI_FORCE_INLINE
LineSplitter& LineSplitter::operator++() {
    if (mSwallow) {
        mSwallow = false;
        return *this;
    }
 
    if (!*this) {
        throw std::logic_error("End of file, no more lines to be retrieved.");
    }
 
    char s;
    mCur.clear();
    while (mStream.GetRemainingSize() && (s = mStream.GetI1(), 1)) {
        if (s == '\n' || s == '\r') {
            if (mSkip_empty_lines) {
                while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\r' || s == '\n'));
                if (mStream.GetRemainingSize()) {
                    mStream.IncPtr(-1);
                }
            } else {
                // skip both potential line terminators but don't read past this line.
                if (mStream.GetRemainingSize() && (s == '\r' && mStream.GetI1() != '\n')) {
                    mStream.IncPtr(-1);
                }
                if (mTrim) {
                    while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\t'));
                    if (mStream.GetRemainingSize()) {
                        mStream.IncPtr(-1);
                    }
                }
            }
            break;
        }
        mCur += s;
    }
    ++mIdx;
 
    return *this;
}
 
AI_FORCE_INLINE
LineSplitter &LineSplitter::operator++(int) {
    return ++(*this);
}
 
AI_FORCE_INLINE
const char *LineSplitter::operator[] (size_t idx) const {
    const char* s = operator->()->c_str();
 
    SkipSpaces(&s);
    for (size_t i = 0; i < idx; ++i) {
 
        for (; !IsSpace(*s); ++s) {
            if (IsLineEnd(*s)) {
                throw std::range_error("Token index out of range, EOL reached");
            }
        }
        SkipSpaces(&s);
    }
    return s;
}
 
template <size_t N>
AI_FORCE_INLINE
void LineSplitter::get_tokens(const char* (&tokens)[N]) const {
    const char* s = operator->()->c_str();
 
    SkipSpaces(&s);
    for (size_t i = 0; i < N; ++i) {
        if (IsLineEnd(*s)) {
            throw std::range_error("Token count out of range, EOL reached");
        }
        tokens[i] = s;
 
        for (; *s && !IsSpace(*s); ++s);
        SkipSpaces(&s);
    }
}
 
AI_FORCE_INLINE
const std::string* LineSplitter::operator -> () const {
    return &mCur;
}
 
AI_FORCE_INLINE
std::string LineSplitter::operator* () const {
    return mCur;
}
 
AI_FORCE_INLINE
LineSplitter::operator bool() const {
    return mStream.GetRemainingSize() > 0;
}
 
AI_FORCE_INLINE
LineSplitter::operator line_idx() const {
    return mIdx;
}
 
AI_FORCE_INLINE
LineSplitter::line_idx LineSplitter::get_index() const {
    return mIdx;
}
 
AI_FORCE_INLINE
StreamReaderLE &LineSplitter::get_stream() {
    return mStream;
}
 
AI_FORCE_INLINE
bool LineSplitter::match_start(const char* check) {
    const size_t len = ::strlen(check);
 
    return len <= mCur.length() && std::equal(check, check + len, mCur.begin());
}
 
AI_FORCE_INLINE
void LineSplitter::swallow_next_increment() {
    mSwallow = true;
}
 
} // Namespace Assimp
 
#endif // INCLUDED_LINE_SPLITTER_H