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engines/mutationofjb/commands/ifitemcommand.cpp

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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/>.
+ *
+ */
+
+#include "mutationofjb/commands/ifitemcommand.h"
+#include "mutationofjb/gamedata.h"
+#include "mutationofjb/script.h"
+#include "mutationofjb/util.h"
+#include "common/str.h"
+
+/** @file
+ * "IFITEM " <item> [ "!" ]
+ *
+ * IFITEM command tests whether an item is in the inventory.
+ * If it is, execution continues to the next line.
+ * Otherwise execution continues after first "#ELSE" or "=ELSE".
+ * The logic can be reversed with exclamation mark at the end.
+ *
+ * Please note that this does not work like you are used to from saner languages.
+ * IFITEM does not have any blocks. It only searches for first #ELSE, so you can have stuff like:
+ *   IFITEM item1
+ *   IFITEM item2
+ *   #ELSE
+ *   ...
+ * This is effectively logical AND.
+ */
+
+namespace MutationOfJB {
+
+bool IfItemCommandParser::parse(const Common::String &line, ScriptParseContext &parseContext, Command *&command) {
+	if (line.size() < 8) {
+		return false;
+	}
+
+	if (!line.hasPrefix("IFITEM")) {
+		return false;
+	}
+
+	const bool negative = (line.lastChar() == '!');
+	Common::String item(line.c_str() + 7);
+	if (negative) {
+		item.deleteLastChar(); // Remove '!'.
+	}
+
+	_tags.push(0);
+	command = new IfItemCommand(item, negative);
+
+	return true;
+}
+
+
+IfItemCommand::IfItemCommand(const Common::String &item, bool negative) :
+	_item(item),
+	_negative(negative) {}
+
+Command::ExecuteResult IfItemCommand::execute(ScriptExecutionContext &scriptExecCtx) {
+	_cachedResult = scriptExecCtx.getGameData()._inventory.hasItem(_item);
+	if (_negative) {
+		_cachedResult = !_cachedResult;
+	}
+
+	return Finished;
+}
+
+Common::String IfItemCommand::debugString() const {
+	return Common::String::format("IFITEM %s%s", _negative ? "NOT " : "", _item.c_str());
+}
+
+}