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% Do not modify this file since it was automatically generated from:
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%  GString-class.R
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% by the Rdoc compiler part of the R.oo package.
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\name{GString}
\docType{class}
\alias{GString}



\title{Character string with advanced substitutions}

\description{
 Package:  R.utils \cr
\bold{Class GString}\cr

\code{character}\cr
\code{~~|}\cr
\code{~~+--}\code{GString}\cr

\bold{Directly known subclasses:}\cr
\cr

public static class \bold{GString}\cr
extends character\cr


}

\usage{
GString(..., sep="")
}

\arguments{
  \item{...}{one or more objects, to be coerced to \code{\link[base]{character}} vectors.}
  \item{sep}{A \code{\link[base]{character}} string to separate the terms.}
}

\section{Fields and Methods}{
 \bold{Methods:}\cr
\tabular{rll}{
 \tab \code{\link[R.utils:as.character.GString]{as.character}} \tab Gets the processed character string.\cr
 \tab \code{\link[R.utils:evaluate.GString]{evaluate}} \tab Parses and evaluates a GString.\cr
 \tab \code{gcat} \tab  -\cr
 \tab \code{\link[R.utils:getBuiltinDate.GString]{getBuiltinDate}} \tab Gets the current date.\cr
 \tab \code{\link[R.utils:getBuiltinDatetime.GString]{getBuiltinDatetime}} \tab Gets the current date and time.\cr
 \tab \code{\link[R.utils:getBuiltinHostname.GString]{getBuiltinHostname}} \tab Gets the hostname of the system running R.\cr
 \tab \code{\link[R.utils:getBuiltinOs.GString]{getBuiltinOs}} \tab Gets the operating system of the running machine.\cr
 \tab \code{\link[R.utils:getBuiltinPid.GString]{getBuiltinPid}} \tab Gets the process id of the current R session.\cr
 \tab \code{\link[R.utils:getBuiltinRhome.GString]{getBuiltinRhome}} \tab Gets the path where R is installed.\cr
 \tab \code{\link[R.utils:getBuiltinRversion.GString]{getBuiltinRversion}} \tab Gets the current R version.\cr
 \tab \code{\link[R.utils:getBuiltinTime.GString]{getBuiltinTime}} \tab Gets the current time.\cr
 \tab \code{\link[R.utils:getBuiltinUsername.GString]{getBuiltinUsername}} \tab Gets the username of the user running R.\cr
 \tab \code{\link[R.utils:getRaw.GString]{getRaw}} \tab Gets the unprocessed GString.\cr
 \tab \code{\link[R.utils:getVariableValue.GString]{getVariableValue}} \tab Gets a variable value given a name and attributes.\cr
 \tab \code{gstring} \tab  -\cr
 \tab \code{\link[R.utils:parse.GString]{parse}} \tab Parses a GString.\cr
 \tab \code{\link[R.utils:print.GString]{print}} \tab Prints the processed GString.\cr
}


 \bold{Methods inherited from character}:\cr
Ops,nonStructure,vector-method, Ops,structure,vector-method, Ops,vector,nonStructure-method, Ops,vector,structure-method, all.equal, as.Date, as.POSIXlt, as.data.frame, as.raster, coerce,ANY,character-method, coerce,character,SuperClassMethod-method, coerce,character,signature-method, coerce<-,ObjectsWithPackage,character-method, coerce<-,signature,character-method, downloadFile, formula, getDLLRegisteredRoutines, glyphJust, isOpen, toAsciiRegExprPattern, toFileListTree, uses


}

\examples{
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# First example
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
who <- "world"

# Compare this...
cat(as.character(GString("Hello ${who}\n")))

# ...to this.
cat(GString("Hello ${who}\n"))

# Escaping
cat(as.character(GString("Hello \\\\${who}\n")))


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Looping over vectors
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
x <- 1:5
y <- c("hello", "world")
cat(as.character(GString("(x,y)=(${x},${y})")), sep=", ")
cat("\n")

cat(as.character(GString("(x,y)=(${x},$[capitalize]{y})")), sep=", ")
cat("\n")


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Predefined ("builtin") variables
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
cat(as.character(GString("Hello ${username} on host ${hostname} running ",
"R v${rversion} in process #${pid} on ${os}. R is installed in ${rhome}.")))


# Other built-in variables/functions...
cat(as.character(GString("Current date: ${date}\n")))
cat(as.character(GString("Current date: $[format='\%d/\%m/\%y']{date}\n")))
cat(as.character(GString("Current time: ${time}\n")))


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Evaluating inline R code
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
cat(as.character(GString("Simple calculation: 1+1=${`1+1`}\n")))
cat(as.character(GString("Alternative current date: ${`date()`}\n")))


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Function values
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Call function rnorm with arguments n=1, i.e. rnorm(n=1)
cat(as.character(GString("Random normal number: $[n=1]{rnorm}\n")))


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Global search-replace feature
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Replace all '-' with '.'
cat(as.character(GString("Current date: ${date/-/.}\n")))
# Another example
cat(as.character(GString("Escaped string: 12*12=${`12*12`/1/}\n")))


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Defining new "builtin" function values
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Define your own builtin variables (functions)
setMethodS3("getBuiltinAletter", "GString", function(object, ...) {
  base::letters[runif(1, min=1, max=length(base::letters))]
})

cat(as.character(GString("A letter: ${aletter}\n")))
cat(as.character(GString("Another letter: ${aletter}\n")))


# Another example
setMethodS3("getBuiltinGstring", "GString", function(object, ...) {
  # Return another GString.
  GString("${date} ${time}")
})

cat(as.character(GString("Advanced example: ${gstring}\n")))


# Advanced example
setMethodS3("getBuiltinRunif", "GString", function(object, n=1, min=0, max=1, ...) {
  formatC(runif(n=n, min=min, max=max), ...)
})

cat(as.character(GString("A random number: ${runif}\n")))
n <- 5
cat(as.character(GString("${n} random numbers: ")))
cat(as.character(GString("$[n=n, format='f']{runif}")))
cat("\n")


# Advanced options.
# Options are parsed as if they are elements in a list, e.g.
#   list(n=runif(n=1,min=1,max=5), format='f')
cat(as.character(GString("$Random number of numbers: ")))
cat(as.character(GString("$[n=runif(n=1,min=1,max=5), format='f']{runif}")))
cat("\n")
}

\author{Henrik Bengtsson}

\seealso{
  For convenience, see functions \code{\link{gstring}}() and \code{\link{gcat}}().
}


\keyword{classes}