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####################################################################
# Thomas Hoffmann #
# CREATED: 05/??/06 #
# #
# DESCRIPTION: #
# Contains attribute setting routines for symbolic loading. #
# Contains 'expandPath' to aid with converting relative filenames #
# to absolute filenames. #
####################################################################
###############################################################
## expandPath(...) #
## Expands the path of a filename (in case the use cwd's). #
###############################################################
expandPath <- function( filename ){
if( (strfindf(filename,'/')==-1 & strfindf(filename,'\\')==-1 )
| substring(filename,1,2)=='..' ) {
if( !isWindows() ) {
filename <- paste( getwd(), '/', filename, sep='' );
}else{
filename <- paste( getwd(), '\\', filename, sep='' );
}
}
return( filename );
}
###############################################################
## is.sym(...) #
## Returns if an object was set to be symbolic. #
###############################################################
is.sym <- function( x )
return( !is.null(attr(x,'sym')) );
###############################################################
## set.sym(...) #
## Sets an object to be symbolic. #
## WARNING: you must do #
## x <- set.sym(x) #
###############################################################
set.sym <- function( x, filename, expand.path=TRUE ){
if( expand.path )
filename <- expandPath( filename );
attr(x,'sym') <- filename;
return( x );
}
###############################################################
## get.sym(...) #
## Returns the filename of the symbolic object. #
###############################################################
get.sym <- function( x )
return( attr(x,'sym') )
## Leftover debugging
#df <- data.frame( c(0,1), c(3,4) )
#is.sym( df ) ## should be false
#df <- set.sym( df, 'attrTest.R' )
#is.sym( df ) ## Now should be true
#get.sym( df ) ## Should return the value
#
#df <- set.sym( df, '/home/notexist.R' )
#get.sym( df ) ## Should return the value
#
#df <- set.sym( df, '../notexist.R' )
#get.sym( df ) ## Should return the value
#
#df <- set.sym( df, '/home/../notexist.R' ) ## This is malformed to some extent, but still works just fine!
#get.sym( df ) ## Should return the value
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