83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
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/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "scanner.h"
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#include "debug.h"
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namespace lean {
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scanner::scanner(std::istream& stream, bool interactive):
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m_interactive(interactive),
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m_spos(0),
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m_curr(0),
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m_line(1),
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m_pos(0),
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m_bpos(0),
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m_bend(0),
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m_stream(stream),
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m_cache_input(false) {
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}
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scanner::~scanner() {
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}
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void scanner::next() {
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if (m_cache_input)
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m_cache.push_back(m_curr);
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lean_assert(m_curr != EOF);
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if (m_interactive) {
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m_curr = m_stream.get();
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}
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else if (m_bpos < m_bend) {
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m_curr = m_buffer[m_bpos];
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m_bpos++;
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}
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else {
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m_stream.read(m_buffer, scanner_buffer_size);
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m_bend = static_cast<unsigned>(m_stream.gcount());
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m_bpos = 0;
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if (m_bpos == m_bend) {
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m_curr = EOF;
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}
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else {
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m_curr = m_buffer[m_bpos];
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m_bpos++;
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}
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}
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m_spos++;
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}
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void scanner::start_caching() {
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m_cache_input = true;
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m_cache.clear();
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}
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void scanner::stop_caching() {
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m_cache_input = false;
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}
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unsigned scanner::cache_size() const {
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return m_cache.size();
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}
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void scanner::reset_cache() {
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m_cache.clear();
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}
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char const * scanner::cached_str(unsigned begin, unsigned end) {
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m_cache_result.clear();
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while (isspace(m_cache[begin]) && begin < end)
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begin++;
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while (begin < end && isspace(m_cache[end-1]))
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end--;
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for (unsigned i = begin; i < end; i++)
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m_cache_result.push_back(m_cache[i]);
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m_cache_result.push_back(0);
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return m_cache_result.data();
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}
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}
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