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common/formats/json.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/>.
+ *
+ */
+
+/*
+ * Files JSON.h and JSONValue.h part of the SimpleJSON Library - https://github.com/MJPA/SimpleJSON
+ *
+ * Copyright (C) 2010 Mike Anchor
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef COMMON_JSON_H
+#define COMMON_JSON_H
+
+#include "common/array.h"
+#include "common/hashmap.h"
+#include "common/hash-str.h"
+#include "common/memstream.h"
+#include "common/str.h"
+
+// Win32 incompatibilities
+#if (defined(WIN32) && !defined(__GNUC__))
+static inline bool isnan(double x) {
+	return x != x;
+}
+
+static inline bool isinf(double x) {
+	return !isnan(x) && isnan(x - x);
+}
+#endif
+
+// Simple function to check a string 's' has at least 'n' characters
+static inline bool simplejson_wcsnlen(const char *s, size_t n) {
+	if (s == nullptr)
+		return false;
+
+	const char *save = s;
+	while (n-- > 0) {
+		if (*(save++) == 0) return false;
+	}
+
+	return true;
+}
+
+namespace Common {
+
+// Custom types
+class JSONValue;
+typedef Array<JSONValue*> JSONArray;
+typedef HashMap<String, JSONValue*> JSONObject;
+
+class JSON;
+
+enum JSONType { JSONType_Null, JSONType_String, JSONType_Bool, JSONType_Number, JSONType_IntegerNumber, JSONType_Array, JSONType_Object };
+
+class JSONValue {
+	friend class JSON;
+
+public:
+	JSONValue(/*NULL*/);
+	JSONValue(const char *charValue);
+	JSONValue(const String &stringValue);
+	JSONValue(bool boolValue);
+	JSONValue(double numberValue);
+	JSONValue(long long int numberValue);
+	JSONValue(const JSONArray &arrayValue);
+	JSONValue(const JSONObject &objectValue);
+	JSONValue(const JSONValue &source);
+	~JSONValue();
+
+	bool isNull() const;
+	bool isString() const;
+	bool isBool() const;
+	bool isNumber() const;
+	bool isIntegerNumber() const;
+	bool isArray() const;
+	bool isObject() const;
+
+	const String &asString() const;
+	bool asBool() const;
+	double asNumber() const;
+	long long int asIntegerNumber() const;
+	const JSONArray &asArray() const;
+	const JSONObject &asObject() const;
+
+	size_t countChildren() const;
+	bool hasChild(size_t index) const;
+	JSONValue *child(size_t index);
+	bool hasChild(const char *name) const;
+	JSONValue *child(const char *name);
+	Array<String> objectKeys() const;
+
+	String stringify(bool const prettyprint = false) const;
+protected:
+	static JSONValue *parse(const char **data);
+
+private:
+	static String stringifyString(const String &str);
+	static uint32 decodeUtf8Char(String::const_iterator &begin, const String::const_iterator &end);
+	static uint8 decodeUtf8Byte(uint8 state, uint32 &codepoint, uint8 byte);
+	String stringifyImpl(size_t const indentDepth) const;
+	static String indent(size_t depth);
+
+	JSONType _type;
+
+	union {
+		bool _boolValue;
+		double _numberValue;
+		long long int _integerValue;
+		String *_stringValue;
+		JSONArray *_arrayValue;
+		JSONObject *_objectValue;
+	};
+
+};
+
+class JSON {
+	friend class JSONValue;
+
+public:
+	/** Prepares raw bytes in a given stream to be parsed with Common::JSON::parse(). */
+	static char *zeroTerminateContents(Common::MemoryWriteStreamDynamic &stream);
+
+	static JSONValue *parse(const Common::String &data) {
+		return parse(data.c_str());
+	}
+	static JSONValue *parse(const char *data);
+	static String stringify(const JSONValue *value);
+protected:
+	static bool skipWhitespace(const char **data);
+	static bool extractString(const char **data, String &str);
+	static uint32 parseUnicode(const char **data);
+	static double parseInt(const char **data);
+	static double parseDecimal(const char **data);
+private:
+	JSON();
+};
+
+} // End of namespace Common
+
+#endif