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#
# xts: eXtensible time-series
#
# Copyright (C) 2009-2015 Jeffrey A. Ryan jeff.a.ryan @ gmail.com
#
# Contributions from Ross Bennett and Joshua M. Ulrich
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
modify.args <- function(formals, arglist, ..., dots=FALSE)
{
# modify.args function from quantstrat
# avoid evaluating '...' to make things faster
dots.names <- eval(substitute(alist(...)))
if(missing(arglist))
arglist <- NULL
arglist <- c(arglist, dots.names)
# see 'S Programming' p. 67 for this matching
# nothing to do if arglist is empty; return formals as a list
if(!length(arglist))
return(as.list(formals))
argnames <- names(arglist)
if(!is.list(arglist) && !is.null(argnames) && !any(argnames == ""))
stop("'arglist' must be a *named* list, with no names == \"\"")
.formals <- formals
onames <- names(.formals)
pm <- pmatch(argnames, onames, nomatch = 0L)
#if(any(pm == 0L))
# message(paste("some arguments stored for", fun, "do not match"))
names(arglist[pm > 0L]) <- onames[pm]
.formals[pm] <- arglist[pm > 0L]
# include all elements from arglist if function formals contain '...'
if(dots && !is.null(.formals$...)) {
dotnames <- names(arglist[pm == 0L])
.formals[dotnames] <- arglist[dotnames]
#.formals$... <- NULL # should we assume we matched them all?
}
# return a list (not a pairlist)
as.list(.formals)
}
# This is how it is used in quantstrat in applyIndicators()
# # replace default function arguments with indicator$arguments
# .formals <- formals(indicator$name)
# .formals <- modify.args(.formals, indicator$arguments, dots=TRUE)
# # now add arguments from parameters
# .formals <- modify.args(.formals, parameters, dots=TRUE)
# # now add dots
# .formals <- modify.args(.formals, NULL, ..., dots=TRUE)
# # remove ... to avoid matching multiple args
# .formals$`...` <- NULL
#
# tmp_val <- do.call(indicator$name, .formals)
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