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exposeClass.R
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exposeClass.R
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# Copyright (C) 2013 - 2016 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/>.
.stdHeader <- c( # #nocov start
"#include <Rcpp.h>",
"using namespace Rcpp ;"
)
.asString <- function(what) if(is.character(what)) what else deparse(what)
.strings <- function(expr) {
if(is.call(expr) && ! identical(expr[[1]], quote(`::`)))
lapply(as.list(expr)[-1], .strings)
else
.asString(expr)
}
.specifyItems <- function(what) {
what <- as.list(what)
wn <- allNames(what)
simple <- !nzchar(wn)
## todo: error checking here that unnamed elements are single strings
wn[simple] <- as.character(what[simple])
names(what) <- wn
what[simple] <- list(character())
what
}
.writeFieldFunction <- function(fldi, typei, CppClass, readOnly, ns, con){
rootName <- paste0("field_", fldi)
writeLines(sprintf(" %s %s_get(%s *obj) { return obj->%s; }\n",
typei, rootName, CppClass, fldi), con)
value <- "_get"
if(!readOnly) {
writeLines(sprintf(" void %s_set(%s *obj, %s value) { obj->%s = value; }\n",
rootName, CppClass, typei, fldi), con)
value <- c(value, "_set")
}
paste0(ns, "::field_", fldi, value)
}
.writeMethodFunction <- function(mdi, sigi, CppClass, ns, con) {
mName <- paste0("method_", mdi)
if(length(sigi) < 1)
stop(gettextf("The type signature for method %s for class %s was of length 0: Must at least include the return type",
mdi, CppClass))
rtnType <- sigi[[1]]
sigi <- sigi[-1]
if(length(sigi)) {
argNames <- paste0("a", seq_along(sigi))
args <- paste(" ,", paste(sigi, argNames, collapse = ", "))
}
else argNames <- args <- ""
writeLines(sprintf(" %s %s(%s *obj%s){ return obj->%s(%s); }\n",
rtnType, mName, CppClass, args, mdi, argNames), con)
paste0(ns, "::",mName)
}
exposeClass <- function(class, constructors, fields, methods,
file = paste0(CppClass, "Module.cpp"),
header = character(),
module = paste0("class_",class), CppClass = class,
readOnly = character(), rename = character(),
Rfile = TRUE) {
## some argument checks
## TODO: checks on constructors, fields, methods
if(length(readOnly)) {
readOnly <- as.character(readOnly)
if(!all(nzchar(readOnly)))
stop("argument readOnly should be a vector of non-empty strings")
}
newnames <- allNames(rename)
if(length(rename)) {
if(!all(sapply(rename, function(x) is.character(x) && length(x) == 1 && nzchar(x))))
stop("argument rename should be a vector of single, non-empty strings")
if(!all(nzchar(newnames)))
stop("all the elements of argument rename should be non-empty strings")
}
if(is.character(file)) {
## are we in a package directory? Writable, searchable src subdirectory:
if(file.access("src",3)==0 && (basename(file) == file))
cfile <- file.path("src", file)
else
cfile <- file
con <- file(cfile, "w")
on.exit({message(sprintf("Wrote C++ file \"%s\"", cfile)); close(con)})
}
else
con <- file
## and for the R code:
if(identical(Rfile, FALSE)) {}
else {
if(identical(Rfile, TRUE))
Rfile <- sprintf("%sClass.R",class)
if(is.character(Rfile)) {
if(file.access("R",3)==0 && (basename(file) == file)) # in a package directory
Rfile <- file.path("R", Rfile)
Rcon <- file(Rfile, "w")
msg <- sprintf("Wrote R file \"%s\"",Rfile)
on.exit({message(msg); close(Rcon)}, add = TRUE)
}
else
Rcon <- Rfile
Rfile <- TRUE
}
mfile <- tempfile()
mcon <- file(mfile, "w")
writeLines(.stdHeader, con)
if(length(header))
writeLines(header, con)
writeLines(c("", sprintf("RCPP_MODULE(%s) {\n",module), ""), mcon)
writeLines(sprintf(" class_<%s>(\"%s\")\n", CppClass, class), mcon)
## the constructors argument defines a list of vectors of types
for( cons in constructors) {
if(length(cons) > 1 ||
(length(cons) == 1 && nzchar(cons) && !identical(cons, "void")))
cons <- paste0("<", paste(cons, collapse = ","),">")
else
cons = ""
writeLines(paste0(" .constructor",cons,"()"),mcon)
}
writeLines("", mcon)
flds <- .specifyItems(fields)
nm <- fnm <- names(flds)
rdOnly <- nm %in% readOnly
macros <- ifelse(rdOnly, ".field_readonly", ".field")
test <- nm %in% rename
if(any(test))
nm[test] <- newnames[match(nm[test], rename)]
ns <- NULL
for(i in seq_along(nm)) {
typei <- flds[[i]]
fldi <- fnm[i]
nmi <- nm[[i]]
macroi <- macros[[i]]
if(!length(typei) || identical(typei, "")) ## direct field
writeLines(sprintf(" %s(\"%s\", &%s::%s)",
macroi, nmi, CppClass, fldi), mcon)
else { # create a free function, e.g. for an inherited field
if(is.null(ns)) { # enclose in a namespace
ns <- paste("module",class,"NS", sep = "_")
writeLines(sprintf("\nnamespace %s {\n", ns),
con)
}
fldFuns <- .writeFieldFunction(fldi, typei, CppClass, rdOnly[[i]], ns, con)
if(rdOnly[[i]])
## NOTE: string 3rd arg. required by problem w. module parsing 10/3/13
writeLines(sprintf(" .property(\"%s\", &%s, \"read-only field\")",
nmi, fldFuns[[1]]), mcon)
else
writeLines(sprintf(" .property(\"%s\", &%s, &%s)",
nmi, fldFuns[[1]], fldFuns[[2]]), mcon)
}
}
writeLines("", mcon)
sigs <- .specifyItems(methods)
nm <- mds <- names(sigs)
test <- nm %in% rename
if(any(test))
nm[test] <- newnames[match(nm[test], rename)]
for(i in seq_along(nm)) {
sigi <- sigs[[i]]
nmi <- nm[[i]]
mdi <- mds[[i]]
if(!length(sigi) || identical(sigi, "")) # direct method
writeLines(sprintf(" .method(\"%s\", &%s::%s)",
nmi, CppClass, mdi), mcon)
else { # create a free function, e.g. for an inherited method
if(is.null(ns)) { # enclose in a namespace
ns <- paste("module",class,"NS", sep = "_")
writeLines(sprintf("\nnamespace %s {\n", ns),
con)
}
mFun <- .writeMethodFunction(mdi, sigi, CppClass, ns, con)
writeLines(sprintf(" .method(\"%s\", &%s)",
nmi, mFun), mcon)
}
}
writeLines(" ;\n}", mcon)
close(mcon)
if(!is.null(ns))
writeLines(sprintf("} // %s", ns), con) # close namespace
writeLines(readLines(mfile), con)
if(Rfile) {
if(missing(CppClass))
CppString <- ""
else
CppString <- paste0(", \"",CppClass, "\"")
if(missing(module))
ModString <- ""
else
ModString <- paste0(", module = \"", module, "\"")
writeLines(sprintf("%s <- setRcppClass(\"%s\"%s%s)",
class, class, CppString,ModString), Rcon)
}
} # #nocov end