A simple macro preprocessor for templating purposes
This function expands a template based on the R expressions in {{}}
(this tag can be customized by the delim argument). These expressions
are extracted, evaluated and replaced by their values in the original
template.
knit_expand(file, ..., text = read_utf8(file), delim = c("{{", "}}"))file |
The template file. |
... |
A list of variables to be used for the code in the template; note that the variables will be searched for in the parent frame as well. |
text |
Character vector of lines of code. An alternative way to specify
the template code directly. If |
delim |
A pair of opening and closing delimiters for the templating tags. |
A character vector, with the tags evaluated and replaced by their values.
This function was inspired by the pyexpander and m4 (http://www.gnu.org/software/m4/), thanks to Frank Harrell.
# see the knit_expand vignette if (interactive()) browseVignettes(package = "knitr")
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