The default "catcodes" used by parseLatex.
Examples
# \makeatletter has no effect by default...
unclass(parseLatex("\\makeatletter\\internal@macro"))
#> [[1]]
#> MACRO: \makeatletter
#>
#> [[2]]
#> MACRO: \internal
#>
#> [[3]]
#> SPECIAL: @
#>
#> [[4]]
#> TEXT: macro
#>
# ... but the effect can be simulated
atletter <- rbind(defaultCatcodes,
data.frame(char="@", catcode=11))
unclass(parseLatex("\\makeatletter\\internal@macro",
catcodes = atletter))
#> [[1]]
#> MACRO: \makeatletter
#>
#> [[2]]
#> MACRO: \internal@macro
#>