/usr/include/ginac/parser.h is in libginac-dev 1.6.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | /** @file parser.h
*
* Interface to the parser. */
/*
* GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef GINAC_PARSER_H
#define GINAC_PARSER_H
#include "parse_context.h"
#include "ex.h"
#include <stdexcept>
namespace GiNaC {
class lexer;
class parse_error : public std::invalid_argument
{
public:
const std::size_t line;
const std::size_t column;
parse_error(const std::string& what_,
const std::size_t line_ = 0,
const std::size_t column_ = 0) throw () :
std::invalid_argument(what_), line(line_), column(column_)
{ }
};
/**
* Recursive descent parser for GiNaC expressions.
*/
class parser
{
// The actual parser rules (in EBNF-alike notation):
/// expression: primary binoprhs
ex parse_expression();
/// primary: indentifier_expr | number_expr | paren_expr | unary_expr
ex parse_primary();
/// binoprhs: ([+*/^-] primary)*
ex parse_binop_rhs(int, ex&);
/// identifier_expr: identifier |
/// identifier '(' expression (',' expression)* ')'
ex parse_identifier_expr();
/// paren_expr: '(' expression ')'
ex parse_paren_expr();
/// lst_expr: '{' expression { ',' expression } '}'
ex parse_lst_expr();
/// number_expr: number
ex parse_number_expr();
/// unary_expr: [+-] expression
ex parse_unary_expr();
/// literal_expr: 'I' | 'Pi' | 'Euler' | 'Catalan'
ex parse_literal_expr();
public:
/**
* @param syms_ symbol table.
* @param funcs_ function/ctors table.
* @param strict_ if true, throw an exception if unknown
* symbol is encountered.
*/
parser(const symtab& syms_ = symtab(),
const bool strict_ = false,
const prototype_table& funcs_ = get_default_reader());
~parser();
/// parse the stream @a input
ex operator()(std::istream& input);
/// parse the string @a input
ex operator()(const std::string& input);
/// report the symbol table used by parser
symtab get_syms() const
{
return syms;
}
/// read/write access to the symbol table
symtab& get_syms()
{
return syms;
}
/// If true, throw an exception if an unknown symbol is encountered.
bool strict;
private:
/**
* Function/ctor table, maps a prototype (which is a name and number
* arguments) to a C++ function. Used for parsing identifier_expr's
* (see parse_identifier_expr). If expression contains unknown
* prototype, an exception will be thrown.
*/
const prototype_table funcs;
/**
* Symbol (variable) table. Used for parsing identifier_expr's
* (see parse_identifier_expr). If parser is strict, exception is
* thrown if an unknown symbol is encountered. Non-strict parser
* appends unknown symbols to the symbol table.
*/
symtab syms;
/// token scanner
lexer* scanner;
/// current token the parser is looking at
int token;
/// read the next token from the scanner
int get_next_tok();
};
} // namespace GiNaC
#endif // ndef GINAC_PARSER_H
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