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engines/mediastation/mediascript/codechunk.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 MEDIASTATION_MEDIASCRIPT_CODECHUNK_H
+#define MEDIASTATION_MEDIASCRIPT_CODECHUNK_H
+
+#include "common/array.h"
+
+#include "mediastation/datafile.h"
+#include "mediastation/mediascript/scriptvalue.h"
+#include "mediastation/mediascript/scriptconstants.h"
+
+namespace MediaStation {
+
+class CodeChunk {
+public:
+	CodeChunk(Chunk &chunk);
+	~CodeChunk();
+
+	ScriptValue executeNextBlock();
+	ScriptValue execute(Common::Array<ScriptValue> *args = nullptr);
+
+private:
+	void skipNextBlock();
+
+	ScriptValue evaluateExpression();
+	ScriptValue evaluateExpression(ExpressionType expressionType);
+	ScriptValue evaluateOperation();
+	ScriptValue evaluateValue();
+	ScriptValue evaluateVariable();
+
+	ScriptValue *readAndReturnVariable();
+
+	void evaluateIf();
+	void evaluateIfElse();
+	ScriptValue evaluateAssign();
+	ScriptValue evaluateBinaryOperation(Opcode op);
+	ScriptValue evaluateUnaryOperation();
+	ScriptValue evaluateFunctionCall(bool isIndirect = false);
+	ScriptValue evaluateFunctionCall(uint functionId, uint paramCount);
+	ScriptValue evaluateMethodCall(bool isIndirect = false);
+	ScriptValue evaluateMethodCall(BuiltInMethod method, uint paramCount);
+	void evaluateDeclareLocals();
+	ScriptValue evaluateReturn();
+	void evaluateReturnNoValue();
+	void evaluateWhileLoop();
+
+	static const uint MAX_LOOP_ITERATION_COUNT = 1000;
+	bool _returnImmediately = false;
+	Common::Array<ScriptValue> _locals;
+	Common::Array<ScriptValue> *_args = nullptr;
+	ParameterReadStream *_bytecode = nullptr;
+};
+
+} // End of namespace MediaStation
+
+#endif