Nothing
# tests if the argument is a start-of-code-chunk marker
startOfCodeChunk <- function(x)
{
if (!is.null(x))
{
s <- strsplit(trim(x), '')[[1]]
n <- length(s)
n >= 5 && all(s[c(1, 2)] == '<' & s[c(n-2, n-1)] == '>') && s[n] == '='
} else {
FALSE
}
}
# tests if the argument is an end-of-code-chunk marker
endOfCodeChunk <- function(x)
{
! is.null(x) && trim(x) == '@'
}
# tests if the argument contains \Sexpr{...} or \SweaveOpts{...}
startOfCodeExpr <- function(x)
{
if (is.null(x))
x <- ''
regexpr('\\\\(Sexpr|SweaveOpts)\\{', x)
}
endOfCodeExpr <- function(x)
{
if (is.null(x))
x <- ''
regexpr('\\}', x)
}
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