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# Copyright (C) 2010 - 2021 John Chambers, Dirk Eddelbuettel and Romain Francois
#
# This file is part of Rcpp.
#
# Rcpp is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# Rcpp is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
setRcppClass <- function(Class, CppClass,
module,
fields = list(),
contains = character(),
methods = list(),
saveAs = Class,
where = topenv(parent.frame()),
...) {
myCall <- match.call()
myCall[[1]] <- quote(Rcpp::loadRcppClass)
if (!missing(module) && moduleIsLoaded(module, where)) # eval now
eval.parent(myCall) # #nocov
else {
f <- function(NS)NULL
myCall$where = as.name("NS")
body(f, where) <- myCall
setLoadAction(f, where = where)
}
}
loadRcppClass <- function(Class, CppClass = Class,
module = paste0("class_",Class),
fields = character(),
contains = character(),
methods = list(),
saveAs = Class,
where = topenv(parent.frame()),
...) {
if(isBotchedSession()) {
value <- setRefClass(Class, fields = fields, methods = methods, contains = contains, where = where, ...) # kludge -- see loadModule.R #nocov start
if(is.character(saveAs) && length(saveAs) == 1)
assign(saveAs, value, envir = where)
return(value) # #nocov end
}
mod <- loadModule(module, NULL, env = where, loadNow = TRUE)
storage <- get("storage", envir = as.environment(mod))
if(exists(Class, envir = storage, inherits = FALSE)) {
cppclassinfo <- get(Class, envir = storage)
if(!is(cppclassinfo, "C++Class"))
stop(gettextf("Object \"%s\" in module \"%s\" is not a C++ class description", Class, module)) # #nocov
}
else
stop(gettextf("No object \"%s\" in module \"%s\"", Class, module)) # #nocov
allmethods <- .makeCppMethods(methods, cppclassinfo, where)
allfields <- .makeCppFields(fields, cppclassinfo, where)
value <- setRefClass(Class, fields = allfields,
contains = c(contains, "RcppClass"),
methods = allmethods, where=where, ...)
## declare the fields and methods to shut up codetools
## the R level fields and methods were declared by setRefClass
## but we declare them again; globalVariables() applies unique()
if(exists("globalVariables", envir = asNamespace("utils"))) # >=2.15.1
utils::globalVariables(c(names(allfields), names(allmethods)),
where)
if(is.character(saveAs) && length(saveAs) == 1)
assign(saveAs, value, envir = where)
value
}
.makeCppMethods <- function(methods, cppclassinfo, env) {
cppMethods <- names(cppclassinfo@methods)
newMethods <- names(methods)
for(what in cppMethods[! cppMethods %in% newMethods])
methods[[what]] <- eval(substitute(
function(...) .CppObject$WHAT(...), list(WHAT = as.name(what))),
env)
methods
}
.makeFieldsList <- function(fields) {
fnames <- allNames(fields)
any_s <- !nzchar(fnames)
fnames[any_s] <- fields[any_s]
fields[any_s] <- "ANY"
fields <- as.list(fields)
names(fields) <- fnames
fields
}
.makeCppFields <- function(fields, cppclassinfo, env) {
if(is.character(fields))
fields <- .makeFieldsList(fields)
cppFields <- names(cppclassinfo@fields)
newFields <- names(fields)
for(what in cppFields[! cppFields %in% newFields])
fields[[what]] <- eval(substitute(
function(value) if(missing(value)) .CppObject$WHAT else .CppObject$WHAT <- value,
list(WHAT = as.name(what))), env)
## insert the generator and cppclass def as constants
cppgenerator <- getRefClass(cppclassinfo)
fields[[".CppClassDef"]] <- eval(substitute(
function(value) if(missing(value)) DEF else stop("this field is a constant"),
list(DEF = cppclassinfo)), env)
fields[[".CppGenerator"]] <- eval(substitute(
function(value) if(missing(value)) DEF else stop("this field is a constant"),
list(DEF = cppgenerator)), env)
fields
}
.RcppClass <- setRefClass("RcppClass",
methods = list(
initialize = function(...){
args <- list(...)
argNames <- allNames(args)
cppArgs <- !nzchar(argNames)
.CppObject <<- do.call(.CppGenerator$new, args[cppArgs])
for(i in seq_along(args)[!cppArgs])
field(argNames[[i]], args[[i]]) # #nocov
}
),
fields = list(
.CppObject = "C++Object"
),
contains = "VIRTUAL"
)
.RcppClass$methods(show = function ()
{
cat("Rcpp class object of class ", classLabel(class(.self)), # #nocov start
"\n", sep = "")
fields <- names(.refClassDef@fieldClasses)
if(".CppObject" %in% fields) {
cat("\n")
methods::show(field(".CppObject"))
cat("\n")
}
fields <- fields[ ! fields %in% c(".CppObject", ".CppClassDef", ".CppGenerator")]
for (fi in fields) {
cat("Field \"", fi, "\":\n", sep = "")
methods::show(field(fi))
}
},
objectPointer = function()
.CppObject$.pointer # #nocov end
)
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