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Add the RcppOctave engine #866

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Add the RcppOctave engine #866

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a52770f
Add the RcppOctave engine
casallas Oct 20, 2014
0d0bb2c
Merge branch 'master' into rcppoctave_engine
casallas Jan 26, 2015
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39 changes: 38 additions & 1 deletion R/engine.R
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Expand Up @@ -139,6 +139,42 @@ eng_Rcpp = function(options) {
engine_output(options, code, '')
}

## RcppOctave
eng_RcppOctave = function(options) {

code = paste(options$code, collapse = '\n')
# engine.opts is a list of arguments to be passed to Rcpp function, e.g.
# engine.opts=list(plugin='RcppArmadillo')
opts = options$engine.opts
if (!is.environment(opts$env)) opts$env = knit_global() # default env is knit_global()
if (!is.logical(opts$retrieve.vars)) opts$retrieve.vars <- FALSE
if (options$eval) {
# Get the octave vars existing before the call
prev_vars <- RcppOctave::o_get(RcppOctave::o_ls())
do.call(getFromNamespace('o_source', 'RcppOctave'), c(list(text = code)))
if (opts$retrieve.vars){
post_names <- RcppOctave::o_ls()
# New vars in octave (prev_vars), and in R (ls)
new_var_names <- post_names[(!post_names %in% names(prev_vars))||(!post_names %in% ls())]
# Deleted vars (clear in octave)
is_del_var <- !names(prev_vars) %in% post_names
del_var_names <- names(prev_vars)[is_del_var]
# Changed vars
non_del_names <- names(prev_vars)[!is_del_var]
is_chg_var <- sapply(non_del_names, function(.c.name) !isTRUE(all.equal(prev_vars[[.c.name]], RcppOctave::o_get(.c.name))))
chg_var_names <- non_del_names[is_chg_var]

# Remove deleted vars
remove(list=del_var_names, envir = opts$env)
# Create new vars, and modify changed vars
sapply(c(new_var_names, chg_var_names), function(.c.name) assign(.c.name, RcppOctave::o_get(.c.name), envir = opts$env))
}
}

options$engine = 'octave' # wrap up source code in octave syntax instead of RcppOctave
engine_output(options, code, '')
}

## Stan
## Compiles Stan model in the code chunk, creates a stanmodel object,
## and assigns it to a variable with the name given in engine.opts$x.
Expand Down Expand Up @@ -275,7 +311,8 @@ rm(i)

# additional engines
knit_engines$set(
highlight = eng_highlight, Rcpp = eng_Rcpp, tikz = eng_tikz, dot = eng_dot,
highlight = eng_highlight, Rcpp = eng_Rcpp, RcppOctave = eng_RcppOctave,
tikz = eng_tikz, dot = eng_dot,
c = eng_shlib, fortran = eng_shlib, asy = eng_dot, cat = eng_cat,
asis = eng_asis, stan = eng_stan
)
Expand Down