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comparison: src/scriptreader.h

src/scriptreader.h

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1 /*
2 * botc source code
3 * Copyright (C) 2012 Santeri `Dusk` Piippo
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * 3. Neither the name of the developer nor the names of its contributors may
15 * be used to endorse or promote products derived from this software without
16 * specific prior written permission.
17 * 4. Redistributions in any form must be accompanied by information on how to
18 * obtain complete source code for the software and any accompanying
19 * software that uses the software. The source code must either be included
20 * in the distribution or be available for no more than the cost of
21 * distribution plus a nominal fee, and must be freely redistributable
22 * under reasonable conditions. For an executable file, complete source
23 * code means the source code for all modules it contains. It does not
24 * include source code for modules or files that typically accompany the
25 * major components of the operating system on which the executable file
26 * runs.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
29 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
32 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 */
40
41 #ifndef __SCRIPTREADER_H__
42 #define __SCRIPTREADER_H__
43
44 #include <stdio.h>
45 #include "str.h"
46 #include "commands.h"
47 #include "objwriter.h"
48
49 #define MAX_FILESTACK 8
50 #define MAX_SCOPE 32
51 #define MAX_CASE 64
52
53 class ScriptVar;
54
55 // Operators
56 enum operator_e {
57 OPER_ADD,
58 OPER_SUBTRACT,
59 OPER_MULTIPLY,
60 OPER_DIVIDE,
61 OPER_MODULUS,
62 OPER_ASSIGN,
63 OPER_ASSIGNADD,
64 OPER_ASSIGNSUB,
65 OPER_ASSIGNMUL,
66 OPER_ASSIGNDIV,
67 OPER_ASSIGNMOD, // -- 10
68 OPER_EQUALS,
69 OPER_NOTEQUALS,
70 OPER_LESSTHAN,
71 OPER_GREATERTHAN,
72 OPER_LESSTHANEQUALS,
73 OPER_GREATERTHANEQUALS,
74 OPER_LEFTSHIFT,
75 OPER_RIGHTSHIFT,
76 OPER_ASSIGNLEFTSHIFT,
77 OPER_ASSIGNRIGHTSHIFT, // -- 20
78 OPER_OR,
79 OPER_AND,
80 OPER_BITWISEOR,
81 OPER_BITWISEAND,
82 OPER_BITWISEEOR,
83 OPER_TERNARY,
84 OPER_STRLEN,
85 };
86
87 // Mark types
88 enum marktype_e {
89 MARKTYPE_LABEL,
90 MARKTYPE_IF,
91 MARKTYPE_INTERNAL, // internal structures
92 };
93
94 // Block types
95 enum scopetype_e {
96 SCOPETYPE_UNKNOWN,
97 SCOPETYPE_IF,
98 SCOPETYPE_WHILE,
99 SCOPETYPE_FOR,
100 SCOPETYPE_DO,
101 SCOPETYPE_SWITCH,
102 SCOPETYPE_ELSE,
103 };
104
105 // ============================================================================
106 // Meta-data about blocks
107 struct ScopeInfo {
108 unsigned int mark1;
109 unsigned int mark2;
110 scopetype_e type;
111 DataBuffer* buffer1;
112
113 // switch-related stuff
114 // Which case are we at?
115 short casecursor;
116
117 // Marks to case-blocks
118 int casemarks[MAX_CASE];
119
120 // Numbers of the case labels
121 int casenumbers[MAX_CASE];
122
123 // actual case blocks
124 DataBuffer* casebuffers[MAX_CASE];
125
126 // What is the current buffer of the block?
127 DataBuffer* recordbuffer;
128 };
129
130 // ============================================================================
131 typedef struct {
132 str name;
133 type_e type;
134 str val;
135 } constinfo_t;
136
137 // ============================================================================
138 // The script reader reads the script, parses it and tells the object writer
139 // the bytecode it needs to write to file.
140 class ScriptReader {
141 public:
142 // ====================================================================
143 // MEMBERS
144 FILE* fp[MAX_FILESTACK];
145 char* filepath[MAX_FILESTACK];
146 int fc;
147
148 unsigned int pos[MAX_FILESTACK];
149 unsigned int curline[MAX_FILESTACK];
150 unsigned int curchar[MAX_FILESTACK];
151 ScopeInfo scopestack[MAX_SCOPE];
152 long savedpos[MAX_FILESTACK]; // filepointer cursor position
153 str token;
154 int commentmode;
155 long prevpos;
156 str prevtoken;
157
158 // ====================================================================
159 // METHODS
160 // scriptreader.cxx:
161 ScriptReader (str path);
162 ~ScriptReader ();
163 void OpenFile (str path);
164 void CloseFile (unsigned int u = MAX_FILESTACK);
165 char ReadChar ();
166 char PeekChar (int offset = 0);
167 bool Next (bool peek = false);
168 void Prev ();
169 str PeekNext (int offset = 0);
170 void Seek (unsigned int n, int origin);
171 void MustNext (const char* c = "");
172 void MustThis (const char* c);
173 void MustString (bool gotquote = false);
174 void MustNumber (bool fromthis = false);
175 void MustBool ();
176 bool BoolValue ();
177
178 void ParserError (const char* message, ...);
179 void ParserWarning (const char* message, ...);
180
181 // parser.cxx:
182 void ParseBotScript (ObjWriter* w);
183 DataBuffer* ParseCommand (CommandDef* comm);
184 DataBuffer* ParseExpression (type_e reqtype);
185 DataBuffer* ParseAssignment (ScriptVar* var);
186 int ParseOperator (bool peek = false);
187 DataBuffer* ParseExprValue (type_e reqtype);
188 str ParseFloat ();
189 void PushScope ();
190
191 // preprocessor.cxx:
192 void PreprocessDirectives ();
193 void PreprocessMacros ();
194 DataBuffer* ParseStatement (ObjWriter* w);
195 void AddSwitchCase (ObjWriter* w, DataBuffer* b);
196
197 private:
198 bool atnewline;
199 char c;
200 void ParserMessage (const char* header, char* message);
201
202 bool DoDirectivePreprocessing ();
203 char PPReadChar ();
204 void PPMustChar (char c);
205 str PPReadWord (char &term);
206 };
207
208 constinfo_t* FindConstant (str token);
209 extern bool g_Neurosphere;
210
211 #endif // __SCRIPTREADER_H__

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