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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file squirrel.hpp defines the Squirrel class */
#ifndef SQUIRREL_HPP
#define SQUIRREL_HPP
class Squirrel {
private:
typedef void (SQPrintFunc)(bool error_msg, const SQChar *message);
HSQUIRRELVM vm; ///< The VirtualMachine instnace for squirrel
void *global_pointer; ///< Can be set by who ever initializes Squirrel
SQPrintFunc *print_func; ///< Points to either NULL, or a custom print handler
bool crashed; ///< True if the squirrel script made an error.
/**
* The internal RunError handler. It looks up the real error and calls RunError with it.
*/
static SQInteger _RunError(HSQUIRRELVM vm);
/**
* Get the squirrel VM. Try to avoid using this.
*/
HSQUIRRELVM GetVM() { return this->vm; }
protected:
/**
* The CompileError handler.
*/
static void CompileError(HSQUIRRELVM vm, const SQChar *desc, const SQChar *source, SQInteger line, SQInteger column);
/**
* The RunError handler.
*/
static void RunError(HSQUIRRELVM vm, const SQChar *error);
/**
* If a user runs 'print' inside a script, this function gets the params.
*/
static void PrintFunc(HSQUIRRELVM vm, const SQChar *s, ...);
/**
* If an error has to be print, this function is called.
*/
static void ErrorPrintFunc(HSQUIRRELVM vm, const SQChar *s, ...);
public:
friend class AIScanner;
friend class AIInstance;
friend void squirrel_register_std(Squirrel *engine);
Squirrel();
~Squirrel();
/**
* Load a script.
* @param script The full script-name to load.
* @return False if loading failed.
*/
bool LoadScript(const char *script);
static bool LoadScript(HSQUIRRELVM vm, const char *script, bool in_root = true);
/**
* Load a file to a given VM.
*/
static SQRESULT LoadFile(HSQUIRRELVM vm, const char *filename, SQBool printerror);
/**
* Adds a function to the stack. Depending on the current state this means
* either a method or a global function.
*/
void AddMethod(const char *method_name, SQFUNCTION proc, uint nparam = 0, const char *params = NULL, void *userdata = NULL, int size = 0);
/**
* Adds a const to the stack. Depending on the current state this means
* either a const to a class or to the global space.
*/
void AddConst(const char *var_name, int value);
/**
* Adds a const to the stack. Depending on the current state this means
* either a const to a class or to the global space.
*/
void AddConst(const char *var_name, bool value);
/**
* Adds a class to the global scope. Make sure to call AddClassEnd when you
* are done adding methods.
*/
void AddClassBegin(const char *class_name);
/**
* Adds a class to the global scope, extending 'parent_class'.
* Make sure to call AddClassEnd when you are done adding methods.
*/
void AddClassBegin(const char *class_name, const char *parent_class);
/**
* Finishes adding a class to the global scope. If this isn't called, no
* class is really created.
*/
void AddClassEnd();
/**
* Resume a VM when it was suspended via a throw.
*/
bool Resume(int suspend = -1);
/**
* Resume the VM with an error so it prints a stack trace.
*/
void ResumeError();
/**
* Tell the VM to do a garbage collection run.
*/
void CollectGarbage();
void InsertResult(bool result);
void InsertResult(int result);
/**
* Call a method of an instance, in various flavors.
* @return False if the script crashed or returned a wrong type.
*/
bool CallMethod(HSQOBJECT instance, const char *method_name, HSQOBJECT *ret, int suspend = -1);
bool CallMethod(HSQOBJECT instance, const char *method_name, int suspend = -1) { return this->CallMethod(instance, method_name, NULL, suspend); }
bool CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, const char **res, int suspend = -1);
bool CallIntegerMethod(HSQOBJECT instance, const char *method_name, int *res, int suspend = -1);
bool CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend = -1);
/**
* Check if a method exists in an instance.
*/
bool MethodExists(HSQOBJECT instance, const char *method_name);
/**
* Creates a class instance.
* @param class_name The name of the class of which we create an instance.
* @param real_instance The instance to the real class, if it represents a real class.
* @param instance Returning value with the pointer to the instance.
* @param release_hook Optional param to give a release hook.
* @return False if creating failed.
*/
static bool CreateClassInstanceVM(HSQUIRRELVM vm, const char *class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook);
/**
* Exactly the same as CreateClassInstanceVM, only callable without instance of Squirrel.
*/
bool CreateClassInstance(const char *class_name, void *real_instance, HSQOBJECT *instance);
/**
* Get the real-instance pointer.
* @note This will only work just after a function-call from within Squirrel
* to your C++ function.
*/
static bool GetRealInstance(HSQUIRRELVM vm, SQUserPointer *ptr) { return SQ_SUCCEEDED(sq_getinstanceup(vm, 1, ptr, 0)); }
/**
* Get the Squirrel-instance pointer.
* @note This will only work just after a function-call from within Squirrel
* to your C++ function.
*/
static bool GetInstance(HSQUIRRELVM vm, HSQOBJECT *ptr, int pos = 1) { sq_getclass(vm, pos); sq_getstackobj(vm, pos, ptr); sq_pop(vm, 1); return true; }
/**
* Convert a Squirrel-object to a string.
*/
static const char *ObjectToString(HSQOBJECT *ptr) { return FS2OTTD(sq_objtostring(ptr)); }
/**
* Convert a Squirrel-object to an integer.
*/
static int ObjectToInteger(HSQOBJECT *ptr) { return sq_objtointeger(ptr); }
/**
* Convert a Squirrel-object to a bool.
*/
static bool ObjectToBool(HSQOBJECT *ptr) { return sq_objtobool(ptr) == 1; }
/**
* Sets a pointer in the VM that is reachable from where ever you are in SQ.
* Useful to keep track of the main instance.
*/
void SetGlobalPointer(void *ptr) { this->global_pointer = ptr; }
/**
* Get the pointer as set by SetGlobalPointer.
*/
static void *GetGlobalPointer(HSQUIRRELVM vm) { return ((Squirrel *)sq_getforeignptr(vm))->global_pointer; }
/**
* Set a custom print function, so you can handle outputs from SQ yourself.
*/
void SetPrintFunction(SQPrintFunc *func) { this->print_func = func; }
/**
* Throw a Squirrel error that will be nicely displayed to the user.
*/
void ThrowError(const char *error) { sq_throwerror(this->vm, OTTD2FS(error)); }
/**
* Release a SQ object.
*/
void ReleaseObject(HSQOBJECT *ptr) { sq_release(this->vm, ptr); }
/**
* Tell the VM to remove \c amount ops from the number of ops till suspend.
*/
static void DecreaseOps(HSQUIRRELVM vm, int amount);
/**
* Did the squirrel code suspend or return normally.
* @return True if the function suspended.
*/
bool IsSuspended();
/**
* Find out if the squirrel script made an error before.
*/
bool HasScriptCrashed();
/**
* Reset the crashed status.
*/
void ResetCrashed();
/**
* Set the AI status to crashed.
*/
void CrashOccurred();
/**
* Are we allowed to suspend the squirrel script at this moment?
*/
bool CanSuspend();
};
#endif /* SQUIRREL_HPP */
|
