42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
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/*
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Copyright (c) 2014 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 <utility>
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#include <string>
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#include "util/trie.h"
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namespace lean {
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/** \brief Set of tokens and their precedences. This information is used by the scanner. */
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class token_set {
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class info {
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bool m_command;
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std::string m_value;
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unsigned m_precedence;
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public:
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info():m_command(true) {}
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info(char const * val):m_command(true), m_value(val), m_precedence(0) {}
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info(char const * val, unsigned prec):m_command(false), m_value(val), m_precedence(prec) {}
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bool is_command() const { return m_command; }
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std::string const & value() const { return m_value; }
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unsigned precedence() const { return m_precedence; }
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};
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ctrie<info> m_tokens;
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explicit token_set(ctrie<info> const & t):m_tokens(t) {}
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friend class init_token_set_fn;
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token_set(bool) {} // NOLINT
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public:
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token_set();
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token_set add_command_token(char const * token) const;
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token_set add_token(char const * token, unsigned prec = 0) const;
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token_set add_token(char const * token, char const * val, unsigned prec = 0) const;
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token_set merge(token_set const & s) const;
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optional<token_set> find(char c) const;
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optional<info> value() const;
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};
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}
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