source-engine/public/tier1/KeyValues.h

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2020-04-22 16:56:21 +00:00
//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifndef KEYVALUES_H
#define KEYVALUES_H
#ifdef _WIN32
#pragma once
#endif
// #include <vgui/VGUI.h>
#ifndef NULL
#ifdef __cplusplus
#define NULL 0
#else
#define NULL ((void *)0)
#endif
#endif
#include "utlvector.h"
#include "Color.h"
#define FOR_EACH_SUBKEY( kvRoot, kvSubKey ) \
for ( KeyValues * kvSubKey = kvRoot->GetFirstSubKey(); kvSubKey != NULL; kvSubKey = kvSubKey->GetNextKey() )
#define FOR_EACH_TRUE_SUBKEY( kvRoot, kvSubKey ) \
for ( KeyValues * kvSubKey = kvRoot->GetFirstTrueSubKey(); kvSubKey != NULL; kvSubKey = kvSubKey->GetNextTrueSubKey() )
#define FOR_EACH_VALUE( kvRoot, kvValue ) \
for ( KeyValues * kvValue = kvRoot->GetFirstValue(); kvValue != NULL; kvValue = kvValue->GetNextValue() )
class IBaseFileSystem;
class CUtlBuffer;
class Color;
typedef void * FileHandle_t;
class CKeyValuesGrowableStringTable;
//-----------------------------------------------------------------------------
// Purpose: Simple recursive data access class
// Used in vgui for message parameters and resource files
// Destructor deletes all child KeyValues nodes
// Data is stored in key (string names) - (string/int/float)value pairs called nodes.
//
// About KeyValues Text File Format:
// It has 3 control characters '{', '}' and '"'. Names and values may be quoted or
// not. The quote '"' character must not be used within name or values, only for
// quoting whole tokens. You may use escape sequences wile parsing and add within a
// quoted token a \" to add quotes within your name or token. When using Escape
// Sequence the parser must now that by setting KeyValues::UsesEscapeSequences( true ),
// which it's off by default. Non-quoted tokens ends with a whitespace, '{', '}' and '"'.
// So you may use '{' and '}' within quoted tokens, but not for non-quoted tokens.
// An open bracket '{' after a key name indicates a list of subkeys which is finished
// with a closing bracket '}'. Subkeys use the same definitions recursively.
// Whitespaces are space, return, newline and tabulator. Allowed Escape sequences
// are \n, \t, \\, \n and \". The number character '#' is used for macro purposes
// (eg #include), don't use it as first character in key names.
//-----------------------------------------------------------------------------
class KeyValues
{
public:
// By default, the KeyValues class uses a string table for the key names that is
// limited to 4MB. The game will exit in error if this space is exhausted. In
// general this is preferable for game code for performance and memory fragmentation
// reasons.
//
// If this is not acceptable, you can use this call to switch to a table that can grow
// arbitrarily. This call must be made before any KeyValues objects are allocated or it
// will result in undefined behavior. If you use the growable string table, you cannot
// share KeyValues pointers directly with any other module. You can serialize them across
// module boundaries. These limitations are acceptable in the Steam backend code
// this option was written for, but may not be in other situations. Make sure to
// understand the implications before using this.
static void SetUseGrowableStringTable( bool bUseGrowableTable );
KeyValues( const char *setName );
//
// AutoDelete class to automatically free the keyvalues.
// Simply construct it with the keyvalues you allocated and it will free them when falls out of scope.
// When you decide that keyvalues shouldn't be deleted call Assign(NULL) on it.
// If you constructed AutoDelete(NULL) you can later assign the keyvalues to be deleted with Assign(pKeyValues).
// You can also pass temporary KeyValues object as an argument to a function by wrapping it into KeyValues::AutoDelete
// instance: call_my_function( KeyValues::AutoDelete( new KeyValues( "test" ) ) )
//
class AutoDelete
{
public:
explicit inline AutoDelete( KeyValues *pKeyValues ) : m_pKeyValues( pKeyValues ) {}
explicit inline AutoDelete( const char *pchKVName ) : m_pKeyValues( new KeyValues( pchKVName ) ) {}
inline ~AutoDelete( void ) { if( m_pKeyValues ) m_pKeyValues->deleteThis(); }
inline void Assign( KeyValues *pKeyValues ) { m_pKeyValues = pKeyValues; }
KeyValues *operator->() { return m_pKeyValues; }
operator KeyValues *() { return m_pKeyValues; }
private:
AutoDelete( AutoDelete const &x ); // forbid
AutoDelete & operator= ( AutoDelete const &x ); // forbid
KeyValues *m_pKeyValues;
};
// Quick setup constructors
KeyValues( const char *setName, const char *firstKey, const char *firstValue );
KeyValues( const char *setName, const char *firstKey, const wchar_t *firstValue );
KeyValues( const char *setName, const char *firstKey, int firstValue );
KeyValues( const char *setName, const char *firstKey, const char *firstValue, const char *secondKey, const char *secondValue );
KeyValues( const char *setName, const char *firstKey, int firstValue, const char *secondKey, int secondValue );
// Section name
const char *GetName() const;
void SetName( const char *setName);
// gets the name as a unique int
int GetNameSymbol() const { return m_iKeyName; }
// File access. Set UsesEscapeSequences true, if resource file/buffer uses Escape Sequences (eg \n, \t)
void UsesEscapeSequences(bool state); // default false
void UsesConditionals(bool state); // default true
bool LoadFromFile( IBaseFileSystem *filesystem, const char *resourceName, const char *pathID = NULL, bool refreshCache = false );
bool SaveToFile( IBaseFileSystem *filesystem, const char *resourceName, const char *pathID = NULL, bool sortKeys = false, bool bAllowEmptyString = false, bool bCacheResult = false );
// Read from a buffer... Note that the buffer must be null terminated
bool LoadFromBuffer( char const *resourceName, const char *pBuffer, IBaseFileSystem* pFileSystem = NULL, const char *pPathID = NULL );
// Read from a utlbuffer...
bool LoadFromBuffer( char const *resourceName, CUtlBuffer &buf, IBaseFileSystem* pFileSystem = NULL, const char *pPathID = NULL );
// Find a keyValue, create it if it is not found.
// Set bCreate to true to create the key if it doesn't already exist (which ensures a valid pointer will be returned)
KeyValues *FindKey(const char *keyName, bool bCreate = false);
KeyValues *FindKey(int keySymbol) const;
KeyValues *CreateNewKey(); // creates a new key, with an autogenerated name. name is guaranteed to be an integer, of value 1 higher than the highest other integer key name
void AddSubKey( KeyValues *pSubkey ); // Adds a subkey. Make sure the subkey isn't a child of some other keyvalues
void RemoveSubKey(KeyValues *subKey); // removes a subkey from the list, DOES NOT DELETE IT
// Key iteration.
//
// NOTE: GetFirstSubKey/GetNextKey will iterate keys AND values. Use the functions
// below if you want to iterate over just the keys or just the values.
//
KeyValues *GetFirstSubKey() { return m_pSub; } // returns the first subkey in the list
KeyValues *GetNextKey() { return m_pPeer; } // returns the next subkey
const KeyValues *GetNextKey() const { return m_pPeer; } // returns the next subkey
void SetNextKey( KeyValues * pDat);
KeyValues *FindLastSubKey(); // returns the LAST subkey in the list. This requires a linked list iteration to find the key. Returns NULL if we don't have any children
//
// These functions can be used to treat it like a true key/values tree instead of
// confusing values with keys.
//
// So if you wanted to iterate all subkeys, then all values, it would look like this:
// for ( KeyValues *pKey = pRoot->GetFirstTrueSubKey(); pKey; pKey = pKey->GetNextTrueSubKey() )
// {
// Msg( "Key name: %s\n", pKey->GetName() );
// }
// for ( KeyValues *pValue = pRoot->GetFirstValue(); pKey; pKey = pKey->GetNextValue() )
// {
// Msg( "Int value: %d\n", pValue->GetInt() ); // Assuming pValue->GetDataType() == TYPE_INT...
// }
KeyValues* GetFirstTrueSubKey();
KeyValues* GetNextTrueSubKey();
KeyValues* GetFirstValue(); // When you get a value back, you can use GetX and pass in NULL to get the value.
KeyValues* GetNextValue();
// Data access
int GetInt( const char *keyName = NULL, int defaultValue = 0 );
uint64 GetUint64( const char *keyName = NULL, uint64 defaultValue = 0 );
float GetFloat( const char *keyName = NULL, float defaultValue = 0.0f );
const char *GetString( const char *keyName = NULL, const char *defaultValue = "" );
const wchar_t *GetWString( const char *keyName = NULL, const wchar_t *defaultValue = L"" );
void *GetPtr( const char *keyName = NULL, void *defaultValue = (void*)0 );
bool GetBool( const char *keyName = NULL, bool defaultValue = false, bool* optGotDefault = NULL );
Color GetColor( const char *keyName = NULL /* default value is all black */);
bool IsEmpty(const char *keyName = NULL);
// Data access
int GetInt( int keySymbol, int defaultValue = 0 );
float GetFloat( int keySymbol, float defaultValue = 0.0f );
const char *GetString( int keySymbol, const char *defaultValue = "" );
const wchar_t *GetWString( int keySymbol, const wchar_t *defaultValue = L"" );
void *GetPtr( int keySymbol, void *defaultValue = (void*)0 );
Color GetColor( int keySymbol /* default value is all black */);
bool IsEmpty( int keySymbol );
// Key writing
void SetWString( const char *keyName, const wchar_t *value );
void SetString( const char *keyName, const char *value );
void SetInt( const char *keyName, int value );
void SetUint64( const char *keyName, uint64 value );
void SetFloat( const char *keyName, float value );
void SetPtr( const char *keyName, void *value );
void SetColor( const char *keyName, Color value);
void SetBool( const char *keyName, bool value ) { SetInt( keyName, value ? 1 : 0 ); }
// Memory allocation (optimized)
void *operator new( size_t iAllocSize );
void *operator new( size_t iAllocSize, int nBlockUse, const char *pFileName, int nLine );
void operator delete( void *pMem );
void operator delete( void *pMem, int nBlockUse, const char *pFileName, int nLine );
KeyValues& operator=( const KeyValues& src );
// Adds a chain... if we don't find stuff in this keyvalue, we'll look
// in the one we're chained to.
void ChainKeyValue( KeyValues* pChain );
void RecursiveSaveToFile( CUtlBuffer& buf, int indentLevel, bool sortKeys = false, bool bAllowEmptyString = false );
bool WriteAsBinary( CUtlBuffer &buffer );
bool ReadAsBinary( CUtlBuffer &buffer, int nStackDepth = 0 );
// Allocate & create a new copy of the keys
KeyValues *MakeCopy( void ) const;
// Allocate & create a new copy of the keys, including the next keys. This is useful for top level files
// that don't use the usual convention of a root key with lots of children (like soundscape files).
KeyValues *MakeCopy( bool copySiblings ) const;
// Make a new copy of all subkeys, add them all to the passed-in keyvalues
void CopySubkeys( KeyValues *pParent ) const;
// Clear out all subkeys, and the current value
void Clear( void );
// Data type
enum types_t
{
TYPE_NONE = 0,
TYPE_STRING,
TYPE_INT,
TYPE_FLOAT,
TYPE_PTR,
TYPE_WSTRING,
TYPE_COLOR,
TYPE_UINT64,
TYPE_NUMTYPES,
};
types_t GetDataType(const char *keyName = NULL);
// Virtual deletion function - ensures that KeyValues object is deleted from correct heap
void deleteThis();
void SetStringValue( char const *strValue );
// unpack a key values list into a structure
void UnpackIntoStructure( struct KeyValuesUnpackStructure const *pUnpackTable, void *pDest, size_t DestSizeInBytes );
// Process conditional keys for widescreen support.
bool ProcessResolutionKeys( const char *pResString );
// Dump keyvalues recursively into a dump context
bool Dump( class IKeyValuesDumpContext *pDump, int nIndentLevel = 0, bool bSorted = false );
// Merge in another KeyValues, keeping "our" settings
void RecursiveMergeKeyValues( KeyValues *baseKV );
void AddSubkeyUsingKnownLastChild( KeyValues *pSubKey, KeyValues *pLastChild );
private:
KeyValues( KeyValues& ); // prevent copy constructor being used
// prevent delete being called except through deleteThis()
~KeyValues();
KeyValues* CreateKey( const char *keyName );
/// Create a child key, given that we know which child is currently the last child.
/// This avoids the O(N^2) behaviour when adding children in sequence to KV,
/// when CreateKey() wil have to re-locate the end of the list each time. This happens,
/// for example, every time we load any KV file whatsoever.
KeyValues* CreateKeyUsingKnownLastChild( const char *keyName, KeyValues *pLastChild );
void CopyKeyValuesFromRecursive( const KeyValues& src );
void CopyKeyValue( const KeyValues& src, size_t tmpBufferSizeB, char* tmpBuffer );
void RemoveEverything();
// void RecursiveSaveToFile( IBaseFileSystem *filesystem, CUtlBuffer &buffer, int indentLevel );
// void WriteConvertedString( CUtlBuffer &buffer, const char *pszString );
// NOTE: If both filesystem and pBuf are non-null, it'll save to both of them.
// If filesystem is null, it'll ignore f.
void RecursiveSaveToFile( IBaseFileSystem *filesystem, FileHandle_t f, CUtlBuffer *pBuf, int indentLevel, bool sortKeys, bool bAllowEmptyString );
void SaveKeyToFile( KeyValues *dat, IBaseFileSystem *filesystem, FileHandle_t f, CUtlBuffer *pBuf, int indentLevel, bool sortKeys, bool bAllowEmptyString );
void WriteConvertedString( IBaseFileSystem *filesystem, FileHandle_t f, CUtlBuffer *pBuf, const char *pszString );
void RecursiveLoadFromBuffer( char const *resourceName, CUtlBuffer &buf );
// For handling #include "filename"
void AppendIncludedKeys( CUtlVector< KeyValues * >& includedKeys );
void ParseIncludedKeys( char const *resourceName, const char *filetoinclude,
IBaseFileSystem* pFileSystem, const char *pPathID, CUtlVector< KeyValues * >& includedKeys );
// For handling #base "filename"
void MergeBaseKeys( CUtlVector< KeyValues * >& baseKeys );
// NOTE: If both filesystem and pBuf are non-null, it'll save to both of them.
// If filesystem is null, it'll ignore f.
void InternalWrite( IBaseFileSystem *filesystem, FileHandle_t f, CUtlBuffer *pBuf, const void *pData, int len );
void Init();
const char * ReadToken( CUtlBuffer &buf, bool &wasQuoted, bool &wasConditional );
void WriteIndents( IBaseFileSystem *filesystem, FileHandle_t f, CUtlBuffer *pBuf, int indentLevel );
void FreeAllocatedValue();
void AllocateValueBlock(int size);
int m_iKeyName; // keyname is a symbol defined in KeyValuesSystem
// These are needed out of the union because the API returns string pointers
char *m_sValue;
wchar_t *m_wsValue;
// we don't delete these
union
{
int m_iValue;
float m_flValue;
void *m_pValue;
unsigned char m_Color[4];
};
char m_iDataType;
char m_bHasEscapeSequences; // true, if while parsing this KeyValue, Escape Sequences are used (default false)
char m_bEvaluateConditionals; // true, if while parsing this KeyValue, conditionals blocks are evaluated (default true)
char unused[1];
KeyValues *m_pPeer; // pointer to next key in list
KeyValues *m_pSub; // pointer to Start of a new sub key list
KeyValues *m_pChain;// Search here if it's not in our list
private:
// Statics to implement the optional growable string table
// Function pointers that will determine which mode we are in
static int (*s_pfGetSymbolForString)( const char *name, bool bCreate );
static const char *(*s_pfGetStringForSymbol)( int symbol );
static CKeyValuesGrowableStringTable *s_pGrowableStringTable;
public:
// Functions that invoke the default behavior
static int GetSymbolForStringClassic( const char *name, bool bCreate = true );
static const char *GetStringForSymbolClassic( int symbol );
// Functions that use the growable string table
static int GetSymbolForStringGrowable( const char *name, bool bCreate = true );
static const char *GetStringForSymbolGrowable( int symbol );
// Functions to get external access to whichever of the above functions we're going to call.
static int CallGetSymbolForString( const char *name, bool bCreate = true ) { return s_pfGetSymbolForString( name, bCreate ); }
static const char *CallGetStringForSymbol( int symbol ) { return s_pfGetStringForSymbol( symbol ); }
};
typedef KeyValues::AutoDelete KeyValuesAD;
enum KeyValuesUnpackDestinationTypes_t
{
UNPACK_TYPE_FLOAT, // dest is a float
UNPACK_TYPE_VECTOR, // dest is a Vector
UNPACK_TYPE_VECTOR_COLOR, // dest is a vector, src is a color
UNPACK_TYPE_STRING, // dest is a char *. unpacker will allocate.
UNPACK_TYPE_INT, // dest is an int
UNPACK_TYPE_FOUR_FLOATS, // dest is an array of 4 floats. source is a string like "1 2 3 4"
UNPACK_TYPE_TWO_FLOATS, // dest is an array of 2 floats. source is a string like "1 2"
};
#define UNPACK_FIXED( kname, kdefault, dtype, ofs ) { kname, kdefault, dtype, ofs, 0 }
#define UNPACK_VARIABLE( kname, kdefault, dtype, ofs, sz ) { kname, kdefault, dtype, ofs, sz }
#define UNPACK_END_MARKER { NULL, NULL, UNPACK_TYPE_FLOAT, 0 }
struct KeyValuesUnpackStructure
{
char const *m_pKeyName; // null to terminate tbl
char const *m_pKeyDefault; // null ok
KeyValuesUnpackDestinationTypes_t m_eDataType; // UNPACK_TYPE_INT, ..
size_t m_nFieldOffset; // use offsetof to set
size_t m_nFieldSize; // for strings or other variable length
};
//-----------------------------------------------------------------------------
// inline methods
//-----------------------------------------------------------------------------
inline int KeyValues::GetInt( int keySymbol, int defaultValue )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetInt( (const char *)NULL, defaultValue ) : defaultValue;
}
inline float KeyValues::GetFloat( int keySymbol, float defaultValue )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetFloat( (const char *)NULL, defaultValue ) : defaultValue;
}
inline const char *KeyValues::GetString( int keySymbol, const char *defaultValue )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetString( (const char *)NULL, defaultValue ) : defaultValue;
}
inline const wchar_t *KeyValues::GetWString( int keySymbol, const wchar_t *defaultValue )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetWString( (const char *)NULL, defaultValue ) : defaultValue;
}
inline void *KeyValues::GetPtr( int keySymbol, void *defaultValue )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetPtr( (const char *)NULL, defaultValue ) : defaultValue;
}
inline Color KeyValues::GetColor( int keySymbol )
{
Color defaultValue( 0, 0, 0, 0 );
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->GetColor( ) : defaultValue;
}
inline bool KeyValues::IsEmpty( int keySymbol )
{
KeyValues *dat = FindKey( keySymbol );
return dat ? dat->IsEmpty( ) : true;
}
bool EvaluateConditional( const char *str );
class CUtlSortVectorKeyValuesByName
{
public:
bool Less( const KeyValues* lhs, const KeyValues* rhs, void * )
{
return Q_stricmp( lhs->GetName(), rhs->GetName() ) < 0;
}
};
//
// KeyValuesDumpContext and generic implementations
//
class IKeyValuesDumpContext
{
public:
virtual bool KvBeginKey( KeyValues *pKey, int nIndentLevel ) = 0;
virtual bool KvWriteValue( KeyValues *pValue, int nIndentLevel ) = 0;
virtual bool KvEndKey( KeyValues *pKey, int nIndentLevel ) = 0;
};
class IKeyValuesDumpContextAsText : public IKeyValuesDumpContext
{
public:
virtual bool KvBeginKey( KeyValues *pKey, int nIndentLevel );
virtual bool KvWriteValue( KeyValues *pValue, int nIndentLevel );
virtual bool KvEndKey( KeyValues *pKey, int nIndentLevel );
public:
virtual bool KvWriteIndent( int nIndentLevel );
virtual bool KvWriteText( char const *szText ) = 0;
};
class CKeyValuesDumpContextAsDevMsg : public IKeyValuesDumpContextAsText
{
public:
// Overrides developer level to dump in DevMsg, zero to dump as Msg
CKeyValuesDumpContextAsDevMsg( int nDeveloperLevel = 1 ) : m_nDeveloperLevel( nDeveloperLevel ) {}
public:
virtual bool KvBeginKey( KeyValues *pKey, int nIndentLevel );
virtual bool KvWriteText( char const *szText );
protected:
int m_nDeveloperLevel;
};
inline bool KeyValuesDumpAsDevMsg( KeyValues *pKeyValues, int nIndentLevel = 0, int nDeveloperLevel = 1 )
{
CKeyValuesDumpContextAsDevMsg ctx( nDeveloperLevel );
return pKeyValues->Dump( &ctx, nIndentLevel );
}
#endif // KEYVALUES_H