79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*
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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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#include <string>
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#include "util/name.h"
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#include "util/list.h"
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#include "util/numerics/mpq.h"
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namespace lean {
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/**
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\brief Lean scanner.
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*/
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class scanner {
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public:
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enum class token {
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LeftParen, RightParen, LeftCurlyBracket, RightCurlyBracket, Colon, Comma, Period, Lambda, Pi, Arrow,
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Let, In, Forall, Exists, Id, CommandId, NatVal, DecimalVal, StringVal, Eq, Assign, Type, Placeholder,
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Show, By, ScriptBlock, Eof
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};
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protected:
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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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std::istream & m_stream;
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int m_script_line; // hack for saving beginning of script block line and pos
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int m_script_pos;
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mpq m_num_val;
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name m_name_val;
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std::string m_buffer;
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list<name> m_commands;
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void throw_exception(char const * msg);
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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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bool check_next(char c);
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bool check_next_is_digit();
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void read_comment();
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name mk_name(name const & curr, std::string const & buf, bool only_digits);
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token read_a_symbol();
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token read_b_symbol();
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token read_c_symbol();
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token read_number();
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token read_string();
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token read_script_block();
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bool is_command(name const & n) const;
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public:
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scanner(std::istream& stream);
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~scanner();
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/** \brief Register a new command keyword. */
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void add_command_keyword(name const & n);
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void set_command_keywords(list<name> const & l) { m_commands = l; }
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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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token scan();
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name const & get_name_val() const { return m_name_val; }
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mpq const & get_num_val() const { return m_num_val; }
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std::string const & get_str_val() const { return m_buffer; }
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int get_script_block_line() const { return m_script_line; }
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int get_script_block_pos() const { return m_script_pos; }
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};
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std::ostream & operator<<(std::ostream & out, scanner::token const & t);
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}
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