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engines/private/grammar.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PRIVATE_GRAMMAR_H
+#define PRIVATE_GRAMMAR_H
+
+#include "common/str.h"
+#include "common/hash-str.h"
+#include "common/hash-ptr.h"
+#include "common/queue.h"
+#include "common/list.h"
+#include "common/array.h"
+#include "common/rect.h"
+
+#include "private/symbol.h"
+
+#define NSTACK 256
+#define NPROG  10000
+
+namespace Private {
+
+typedef struct Datum {  /* interpreter stack type */
+	short type;
+	union {
+		int  val;
+		const char	*str;
+		Symbol  *sym;
+		Common::Rect *rect;
+	} u;
+} Datum;
+
+typedef struct Arg {
+	int n;
+	int (** inst)();
+} Arg;
+
+typedef int (* Inst)();  /* machine instruction */
+#define STOP	(Inst) 0
+
+typedef Common::HashMap<void *, Common::String *> PtrToName;
+
+void initInsts();
+void initFuncs();
+
+namespace Settings {
+
+typedef struct Setting {
+	Datum stack[NSTACK]; /* the stack */
+	Inst  prog[NPROG];   /* the machine */
+} Setting;
+
+typedef Common::HashMap<Common::String, Setting *> SettingMap;
+
+class SettingMaps {
+public:
+	SettingMaps();
+	~SettingMaps();
+
+	Setting *_setting;
+	SettingMap _map;
+
+	void init();
+	void save(const char *);
+	void load(const Common::String &);
+
+private:
+	Common::Array<Setting *> _settings;
+};
+
+extern SettingMaps *g_setts;
+
+}
+
+// Funtions
+
+typedef Common::Array<Datum> ArgArray;
+void call(const char *, const ArgArray &);
+
+// Code Generation and Execution
+
+namespace Gen {
+
+class VM {
+public:
+	Datum *_stack;  /* the stack */
+	Datum *_stackp; /* next free spot on stack */
+
+	Inst  *_progp;  /* next free spot for code generation */
+	Inst  *_prog;   /* the machine */
+	Inst  *_pc;	 /* program counter during execution */
+	void run();	 /* run the virtual machine */
+};
+
+extern VM *g_vm;
+
+Datum pop();
+int push(const Datum &);
+
+Inst *code(const Inst &);
+int eval();
+int add();
+int negate();
+int power();
+int assign();
+int bltin();
+int varpush();
+int constpush();
+int strpush();
+int funcpush();
+int print();
+int ifcode();
+int fail();
+int lt();
+int gt();
+int le();
+int ge();
+int eq();
+int ne();
+int randbool();
+
+// Code Execution
+
+void execute(Inst *);
+
+}
+
+} // End of namespace Private
+
+#endif