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source: code/trunk/src/libraries/util/ExprParser.h @ 8383

Last change on this file since 8383 was 8351, checked in by rgrieder, 14 years ago

Merged kicklib2 branch back to trunk (includes former branches ois_update, mac_osx and kicklib).

Notes for updating

Linux:
You don't need an extra package for CEGUILua and Tolua, it's already shipped with CEGUI.
However you do need to make sure that the OgreRenderer is installed too with CEGUI 0.7 (may be a separate package).
Also, Orxonox now recognises if you install the CgProgramManager (a separate package available on newer Ubuntu on Debian systems).

Windows:
Download the new dependency packages versioned 6.0 and use these. If you have problems with that or if you don't like the in game console problem mentioned below, you can download the new 4.3 version of the packages (only available for Visual Studio 2005/2008).

Key new features:

  • *Support for Mac OS X*
  • Visual Studio 2010 support
  • Bullet library update to 2.77
  • OIS library update to 1.3
  • Support for CEGUI 0.7 —> Support for Arch Linux and even SuSE
  • Improved install target
  • Compiles now with GCC 4.6
  • Ogre Cg Shader plugin activated for Linux if available
  • And of course lots of bug fixes

There are also some regressions:

  • No support for CEGUI 0.5, Ogre 1.4 and boost 1.35 - 1.39 any more
  • In game console is not working in main menu for CEGUI 0.7
  • Tolua (just the C lib, not the application) and CEGUILua libraries are no longer in our repository. —> You will need to get these as well when compiling Orxonox
  • And of course lots of new bugs we don't yet know about
  • Property svn:eol-style set to native
File size: 4.9 KB
Line 
1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Reto Grieder
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29/**
30@file
31@ingroup Util
32@brief Declaration of FloatParser
33*/
34
35#ifndef _FloatParser_H__
36#define _FloatParser_H__
37
38#include "UtilPrereqs.h"
39
40#include <map>
41#include <string>
42
43namespace orxonox
44{
45    /** Parser for expressions like \c "3 * cos(5 + 4) / a" where \a a is a predeclared
46        variable.
47    @par Usage
48        Using it is rather simple:
49        @code
50        std::string str("3 + 4");
51        ExprParser expr;
52        expr.parse(str);
53        if (expr.getSuccess())
54        {
55            if (!expr.getRemains().empty())
56            {
57                COUT(2) << "Warning: Expression could not be parsed to the end! Remains: '" << expr.getRemains() << '\'' << std::endl;
58            }
59            float result = expr.getResult();
60        }
61        else
62            COUT(1) << "Error: Cannot calculate expression: Parse error." << std::endl;
63        @endcode
64        getRemains() returns the expression after what could be parsed. For instance
65        \c "2*3 text" will return \c "text" as remains.
66    @details
67        The implementation of this class is really old and sort of a trial for
68        a first C++ class by Reto. That explains why it looks more like C than
69        C++... Also some of the variable names are in German. <br>
70        Explaining how it works exactly is probably not possible anymore, but it
71        is based on recursively parsing the expression character by character.
72        That much I can remember.
73    @par Functions, operators and variables supported
74        - Variables:
75            - e
76            - pi
77        - Functions:
78            - sin, asin, sinh, asinh
79            - cos, acos, cosh, acosh
80            - tan, atan, tanh, atanh
81            - int, floor, ceil, abs, sign
82            - pow, sqrt, exp, ln, log
83            - mod, div
84            - min, max
85            - radians, degrees
86        - Operators:
87            - +, -, ! (unary)
88            - +, -, *, /, %, ^, |, &, !, <, >, !=, <=, >=, =
89    @note
90        Operators may not be very consistent with C++ rules, but using the class
91        for plus and minus should be perfectly ok.
92    */
93    class _UtilExport ExprParser
94    {
95    public:
96        enum binary_operator
97        {
98            b_plus,
99            b_minus,
100            mal,
101            durch,
102            modulo,
103            hoch,
104            undef,
105            oder,
106            und,
107            gleich,
108            b_nicht,
109            kleiner,
110            groesser,
111            ungleich,
112            kleinergleich,
113            groessergleich
114        };
115
116        enum unary_operator
117        {
118            u_plus,
119            u_minus,
120            u_nicht
121        };
122
123
124        ExprParser();
125        void parse(const std::string& str);
126        const std::string& getRemains() { return  this->remains_; }
127        float              getResult()  { return  this->result_; }
128        bool               getSuccess() { return !this->failed_; }
129
130        void setVariable(const std::string& varname, float value);
131
132    private:
133        float parse_expr_1();
134        float parse_expr_2();
135        float parse_expr_3();
136        float parse_expr_4();
137        float parse_expr_5();
138        float parse_expr_6();
139        float parse_expr_7();
140        float parse_expr_8();
141        char* parse_word(char* str);
142        binary_operator parse_binary_operator();
143        unary_operator parse_unary_operator();
144
145        float parse_argument();
146        float parse_last_argument();
147
148        binary_operator op;
149        const char* reading_stream;
150        bool failed_;
151        float result_;
152        std::string remains_;
153        std::map<std::string, float> variables_;
154    };
155
156    //Endzeichen für float expression: ')', '}', ']', ',', ';'
157    _UtilExport bool parse_float(char* const, char**, float*);
158    //Endzeichen angegeben
159    _UtilExport bool parse_float(char* const, char**, char, float*);
160    //Letzter Teil-float eines Vektors parsen (keine Vergleichs- und Logikoperationen)
161    _UtilExport bool parse_vector_float(char* const, char**, bool, float*);
162}
163
164#endif /* _FloatParser_H__ */
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