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public/tier1/keyvaluesjson.h

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+//========= Copyright Valve Corporation, All rights reserved. =================//
+//
+// Read JSON-formatted data into KeyValues
+//
+//=============================================================================//
+
+#ifndef KEYVALUESJSON_H
+#define KEYVALUESJSON_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "KeyValues.h"
+
+class CUtlBuffer;
+
+/// JSON parser.  Use this class when you need to customize the parsing.
+class KeyValuesJSONParser
+{
+public:
+	KeyValuesJSONParser( const CUtlBuffer &buf );
+	KeyValuesJSONParser( const char *pszText, int cbSize = -1 );
+	~KeyValuesJSONParser();
+
+	/// Parse the whole string.  If there's a problem, returns NULL and sets m_nLine,m_szErrMsg with more info. 
+	KeyValues *ParseFile();
+
+	/// Error message is returned here, if there is one.
+	char m_szErrMsg[ 1024 ];
+
+	/// Line number of current token during parsing, or of the error, of pasring fails
+	int m_nLine;
+
+private:
+
+	bool ParseObject( KeyValues *pObject );
+	bool ParseArray( KeyValues *pArray );
+	bool ParseValue( KeyValues *pValue );
+	void Init( const char *pszText, int cbSize );
+
+	const char *m_cur;
+	const char *m_end;
+
+	enum
+	{
+		kToken_Err = -2, // An error has been discovered, don't parse anything else
+		kToken_EOF = -1,
+		kToken_String = 1,
+		kToken_NumberInt = 2,
+		kToken_NumberFloat = 3,
+		kToken_True = 4,
+		kToken_False = 5,
+		kToken_Null = 6,
+	};
+
+	int m_eToken;
+	CUtlVectorFixedGrowable<char,1024> m_vecTokenChars;
+
+	void NextToken();
+	void ParseNumberToken();
+	void ParseStringToken();
+	const char *GetTokenDebugText();
+};
+
+#ifdef _DEBUG
+extern void TestKeyValuesJSONParser();
+#endif
+
+#endif // KEYVALUESJSON_H