TeX group by character position

Opening a brace increases the 'group' in TeX. For example, in a{bc}{d{e}} a is in group 0, bc in group 1 as is d and e is in group 2.

tex_group_by_char(tex_lines, optional = FALSE)

Arguments

tex_lines	Character vector of a document LaTeX.
optional	If `FALSE` (the default), the groups are taken with respect to braces. If `TRUE`, square brackets are used (perhaps not associated with a command).

A list the same length as lines. Each element an integer vector indicating the TeX group at that position.

For positions at braces the upcoming group is returned. So a{b} should return 0 1 1 0 (in its first element).

tex_group_by_char("a{bc}{d{e}}")
#> [[1]]
#>  [1] 0 1 1 1 0 1 1 2 2 1 0
#>