Team Fortress 2 Source Code as on 22/4/2020
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Controls the loading, parsing and creation of the entities from the BSP.
//
//=============================================================================//
#include "cbase.h"
#include "mapentities_shared.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
#if !defined(_STATIC_LINKED) || defined(CLIENT_DLL)
static const char *s_BraceChars = "{}()\'";
static bool s_BraceCharacters[256];
static bool s_BuildReverseMap = true;
bool MapEntity_ExtractValue( const char *pEntData, const char *keyName, char Value[MAPKEY_MAXLENGTH] )
{
char token[MAPKEY_MAXLENGTH];
const char *inputData = pEntData;
while ( inputData )
{
inputData = MapEntity_ParseToken( inputData, token ); // get keyname
if ( token[0] == '}' ) // end of entity?
break; // must not have seen the classname
// is this the right key?
if ( !strcmp(token, keyName) )
{
inputData = MapEntity_ParseToken( inputData, token ); // get value and return it
Q_strncpy( Value, token, MAPKEY_MAXLENGTH );
return true;
}
inputData = MapEntity_ParseToken( inputData, token ); // skip over value
}
return false;
}
int MapEntity_GetNumKeysInEntity( const char *pEntData )
{
char token[MAPKEY_MAXLENGTH];
const char *inputData = pEntData;
int iNumKeys = 0;
while ( inputData )
{
inputData = MapEntity_ParseToken( inputData, token ); // get keyname
if ( token[0] == '}' ) // end of entity?
break; // must not have seen the classname
iNumKeys++;
inputData = MapEntity_ParseToken( inputData, token ); // skip over value
}
return iNumKeys;
}
// skips to the beginning of the next entity in the data block
// returns NULL if no more entities
const char *MapEntity_SkipToNextEntity( const char *pMapData, char *pWorkBuffer )
{
if ( !pMapData )
return NULL;
// search through the map string for the next matching '{'
int openBraceCount = 1;
while ( pMapData != NULL )
{
pMapData = MapEntity_ParseToken( pMapData, pWorkBuffer );
if ( FStrEq(pWorkBuffer, "{") )
{
openBraceCount++;
}
else if ( FStrEq(pWorkBuffer, "}") )
{
if ( --openBraceCount == 0 )
{
// we've found the closing brace, so return the next character
return pMapData;
}
}
}
// eof hit
return NULL;
}
//-----------------------------------------------------------------------------
// Purpose: parses a token out of a char data block
// the token gets fully read no matter what the length, but only MAPKEY_MAXLENGTH
// characters are written into newToken
// Input : char *data - the data to parse
// char *newToken - the buffer into which the new token is written
// char *braceChars - a string of characters that constitute braces. this pointer needs to be
// distince for each set of braceChars, since the usage is cached.
// Output : const char * - returns a pointer to the position in the data following the newToken
//-----------------------------------------------------------------------------
const char *MapEntity_ParseToken( const char *data, char *newToken )
{
int len;
len = 0;
newToken[0] = 0;
if (!data)
return NULL;
// build the new table if we have to
if ( s_BuildReverseMap )
{
s_BuildReverseMap = false;
Q_memset( s_BraceCharacters, 0, sizeof(s_BraceCharacters) );
for ( const char *c = s_BraceChars; *c; c++ )
{
s_BraceCharacters[(unsigned)*c] = true;
}
}
int c;
// skip whitespace
skipwhite:
while ( (c = *data) <= ' ')
{
if (c == 0)
return NULL; // end of file;
data++;
}
// skip // comments
if (c=='/' && data[1] == '/')
{
while (*data && *data != '\n')
data++;
goto skipwhite;
}
// handle quoted strings specially
if (c == '\"')
{
data++;
while ( len < MAPKEY_MAXLENGTH )
{
c = *data++;
if (c=='\"' || !c)
{
newToken[len] = 0;
return data;
}
newToken[len] = c;
len++;
}
if ( len >= MAPKEY_MAXLENGTH )
{
len--;
newToken[len] = 0;
}
}
// parse single characters
if ( s_BraceCharacters[c]/*c=='{' || c=='}'|| c==')'|| c=='(' || c=='\''*/ )
{
newToken[len] = c;
len++;
newToken[len] = 0;
return data+1;
}
// parse a regular word
do
{
newToken[len] = c;
data++;
len++;
c = *data;
if ( s_BraceCharacters[c] /*c=='{' || c=='}'|| c==')'|| c=='(' || c=='\''*/ )
break;
if ( len >= MAPKEY_MAXLENGTH )
{
len--;
newToken[len] = 0;
}
} while (c>32);
newToken[len] = 0;
return data;
}
#endif // !STATIC_LINKED || CLIENT_DLL
/* ================= CEntityMapData definition ================ */
bool CEntityMapData::ExtractValue( const char *keyName, char *value )
{
return MapEntity_ExtractValue( m_pEntData, keyName, value );
}
bool CEntityMapData::GetFirstKey( char *keyName, char *value )
{
m_pCurrentKey = m_pEntData; // reset the status pointer
return GetNextKey( keyName, value );
}
const char *CEntityMapData::CurrentBufferPosition( void )
{
return m_pCurrentKey;
}
bool CEntityMapData::GetNextKey( char *keyName, char *value )
{
char token[MAPKEY_MAXLENGTH];
// parse key
char *pPrevKey = m_pCurrentKey;
m_pCurrentKey = (char*)MapEntity_ParseToken( m_pCurrentKey, token );
if ( token[0] == '}' )
{
// step back
m_pCurrentKey = pPrevKey;
return false;
}
if ( !m_pCurrentKey )
{
Warning( "CEntityMapData::GetNextKey: EOF without closing brace\n" );
Assert(0);
return false;
}
Q_strncpy( keyName, token, MAPKEY_MAXLENGTH );
// fix up keynames with trailing spaces
int n = strlen(keyName);
while (n && keyName[n-1] == ' ')
{
keyName[n-1] = 0;
n--;
}
// parse value
m_pCurrentKey = (char*)MapEntity_ParseToken( m_pCurrentKey, token );
if ( !m_pCurrentKey )
{
Warning( "CEntityMapData::GetNextKey: EOF without closing brace\n" );
Assert(0);
return false;
}
if ( token[0] == '}' )
{
Warning( "CEntityMapData::GetNextKey: closing brace without data\n" );
Assert(0);
return false;
}
// value successfully found
Q_strncpy( value, token, MAPKEY_MAXLENGTH );
return true;
}
//-----------------------------------------------------------------------------
// Purpose: find the keyName in the endata and change its value to specified one
//-----------------------------------------------------------------------------
bool CEntityMapData::SetValue( const char *keyName, char *NewValue, int nKeyInstance )
{
// If this is -1, the size of the string is unknown and cannot be safely modified!
Assert( m_nEntDataSize != -1 );
if ( m_nEntDataSize == -1 )
return false;
char token[MAPKEY_MAXLENGTH];
char *inputData = m_pEntData;
char *prevData;
char newvaluebuf[ 1024 ];
int nCurrKeyInstance = 0;
while ( inputData )
{
inputData = (char*)MapEntity_ParseToken( inputData, token ); // get keyname
if ( token[0] == '}' ) // end of entity?
break; // must not have seen the classname
// is this the right key?
if ( !strcmp(token, keyName) )
{
++nCurrKeyInstance;
if ( nCurrKeyInstance > nKeyInstance )
{
// Find the start & end of the token we're going to replace
int entLen = strlen(m_pEntData);
char *postData = new char[entLen];
prevData = inputData;
inputData = (char*)MapEntity_ParseToken( inputData, token ); // get keyname
Q_strncpy( postData, inputData, entLen );
// Insert quotes if caller didn't
if ( NewValue[0] != '\"' )
{
Q_snprintf( newvaluebuf, sizeof( newvaluebuf ), "\"%s\"", NewValue );
}
else
{
Q_strncpy( newvaluebuf, NewValue, sizeof( newvaluebuf ) );
}
int iNewValueLen = Q_strlen(newvaluebuf);
int iPadding = iNewValueLen - Q_strlen( token ) - 2; // -2 for the quotes (token doesn't have them)
// prevData has a space at the start, seperating the value from the key.
// Add 1 to prevData when pasting in the new Value, to account for the space.
Q_strncpy( prevData+1, newvaluebuf, iNewValueLen+1 ); // +1 for the null terminator
Q_strcat( prevData, postData, m_nEntDataSize - ((prevData-m_pEntData)+1) );
m_pCurrentKey += iPadding;
delete [] postData;
return true;
}
}
inputData = (char*)MapEntity_ParseToken( inputData, token ); // skip over value
}
return false;
}