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/********************* */
/*! \file line_buffer.cpp
** \verbatim
** Top contributors (to current version):
** Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief The LineBuffer class stores lines from an input stream
**
** For each line, the class allocates a separate buffer.
**/
#include "parser/line_buffer.h"
#include <cassert>
#include <cstring>
#include <iostream>
#include <string>
namespace CVC4 {
namespace parser {
LineBuffer::LineBuffer(std::istream* stream) : d_stream(stream) {}
LineBuffer::~LineBuffer() {
for (size_t i = 0; i < d_lines.size(); i++) {
delete[] d_lines[i];
}
}
uint8_t* LineBuffer::getPtr(size_t line, size_t pos_in_line) {
if (!readToLine(line)) {
return NULL;
}
assert(pos_in_line < d_sizes[line]);
return d_lines[line] + pos_in_line;
}
uint8_t* LineBuffer::getPtrWithOffset(size_t line, size_t pos_in_line,
size_t offset) {
if (!readToLine(line)) {
return NULL;
}
if (pos_in_line + offset >= d_sizes[line]) {
return getPtrWithOffset(line + 1, 0,
offset - (d_sizes[line] - pos_in_line - 1));
}
assert(pos_in_line + offset < d_sizes[line]);
return d_lines[line] + pos_in_line + offset;
}
bool LineBuffer::isPtrBefore(uint8_t* ptr, size_t line, size_t pos_in_line) {
for (ssize_t i = line; i >= 0; i--) {
// NOTE: std::less is guaranteed to give consistent results when comparing
// pointers of different arrays (in contrast to built-in comparison
// operators).
uint8_t* end = d_lines[i] + ((i == line) ? pos_in_line : d_sizes[i]);
if (std::less<uint8_t*>()(d_lines[i] - 1, ptr) &&
std::less<uint8_t*>()(ptr, end)) {
return true;
}
}
return false;
}
bool LineBuffer::readToLine(size_t line) {
while (line >= d_lines.size()) {
if (!(*d_stream)) {
return false;
}
std::string line;
std::getline(*d_stream, line);
uint8_t* segment = new uint8_t[line.size() + 1];
std::memcpy(segment, line.c_str(), line.size());
segment[line.size()] = LineBuffer::NewLineChar;
d_lines.push_back(segment);
d_sizes.push_back(line.size() + 1);
}
return true;
}
} // namespace parser
} // namespace CVC4
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