56 lines
1.4 KiB
C
56 lines
1.4 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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#pragma once
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#include <iostream>
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#include <vector>
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namespace lean {
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constexpr unsigned scanner_buffer_size = 1024;
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/**
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\brief Base class for all scanners in Lean
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It provides basic support for reading streams, buffering, and caching the contents of the input stream.
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*/
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class scanner {
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protected:
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bool m_interactive;
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int m_spos; // position in the current line of the stream
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char m_curr; // current char;
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int m_line; // line
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int m_pos; // start position of the token
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char m_buffer[scanner_buffer_size];
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unsigned m_bpos;
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unsigned m_bend;
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std::istream& m_stream;
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bool m_cache_input;
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std::vector<char> m_cache;
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std::vector<char> m_cache_result;
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char curr() const { return m_curr; }
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void new_line() { m_line++; m_spos = 0; }
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void next();
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public:
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scanner(std::istream& stream, bool interactive = false);
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~scanner();
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int get_line() const { return m_line; }
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int get_pos() const { return m_pos; }
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void start_caching();
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void stop_caching();
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unsigned cache_size() const;
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void reset_cache();
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char const * cached_str(unsigned begin, unsigned end);
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};
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}
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