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engines/bagel/spacebar/baglib/expression.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 BAGEL_BAGLIB_EXPRESSION_H
+#define BAGEL_BAGLIB_EXPRESSION_H
+
+#include "bagel/spacebar/baglib/parse_object.h"
+#include "bagel/spacebar/baglib/var.h"
+#include "bagel/spacebar/boflib/list.h"
+
+namespace Bagel {
+namespace SpaceBar {
+
+class CBagExpression : public CBagParseObject, public CBofObject {
+public:
+	enum OPERATION {
+		OP_NONE,
+		OP_ASSIGN,
+		OP_EQUAL,
+		OP_NOT_EQUAL,
+		OP_LESS_THAN,
+		OP_LESS_THAN_EQUAL,
+		OP_GREATER_THAN,
+		OP_GREATER_THAN_EQUAL,
+		OP_PLUS_ASSIGN,
+		OP_MINUS_ASSIGN,
+		OP_CONTAINS,
+		OP_HAS,
+		OP_CURR_SDEV,
+		OP_PLUS,
+		OP_MINUS,
+		OP_MULTIPLY,
+		OP_DIVIDE,
+		OP_AND,
+		OP_OR,
+		OP_MOD,
+		OP_STATUS
+	};
+
+private:
+	CBofList<CBagVar *> _varList;    // Right hand operator
+	CBofList<OPERATION> _operList;   // Operation to be preformed
+	CBagExpression *_prevExpression; // Not null when when this is an enclosed expression
+
+	bool _prevNegativeFl; // True if the operation should return Negative results
+	bool _negativeFl;     // True if the operation should return Negative results
+
+	bool evaluate(CBagVar *leftHandOper, CBagVar *rightHandOper, OPERATION oper, CBagVar &result);
+
+public:
+	static CBagVar *_tempVar; // Used as a default param
+	static void initialize();
+	static void shutdown();
+
+	CBagExpression(CBagExpression *prevExpr = nullptr, bool prevNegFl = false);
+	virtual ~CBagExpression();
+
+	bool evaluate(bool negFl = false, CBagVar &result = *_tempVar);
+
+	/**
+	 * Same as evaluate above except it evaluates left to right and preserves
+	 * the value of the previous evaluation in the loop.  Provides partial
+	 * evaluation hierarchy support.
+	 */
+	bool evalLeftToRight(bool negFl = false, CBagVar &result = *_tempVar);
+
+	bool negEvaluate(CBagVar &result = *_tempVar);
+
+	void setNegative(bool b = true) {
+		_negativeFl = b;
+	}
+	bool isNegative() const {
+		return _negativeFl;
+	}
+
+	CBagVar *getVariable(int itemPos);
+	OPERATION getOperation(int itemPos);
+
+	ParseCodes setInfo(CBagIfstream &istr) override;
+	ErrorCode getOperatorFromStream(CBagIfstream &istr, OPERATION &oper);
+
+	CBagExpression *getPrevExpression() const {
+		return _prevExpression;
+	}
+	void setPrevExpression(CBagExpression *expr) {
+		_prevExpression = expr;
+	}
+
+	virtual bool onAssign(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onEqual(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onNotEqual(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onLessThan(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onGreaterThan(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onLessThanEqual(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onGreaterThanEqual(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onPlusAssign(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onMinusAssign(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onContains(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onHas(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onCurrSDev(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onPlus(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onMinus(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onMultiply(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onDivide(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onMod(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onAnd(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onOr(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+	virtual bool onStatus(CBagVar *leftHandOper, CBagVar *rightHandOper, CBagVar &resultOper);
+};
+
+} // namespace SpaceBar
+} // namespace Bagel
+
+#endif