extract_mandatory_LaTeX_argument: Extract mandatory argument II
In TeXCheckR: Parses LaTeX Documents for Errors

Extract mandatory argument II

extract_mandatory_LaTeX_argument(
  tex_lines,
  command_name,
  n = 1L,
  by.line = FALSE,
  parsed_doc = NULL
)

`tex_lines`	A character vector of lines as read from a LaTeX document.
`command_name`	The command name (no backslash or opening brace).
`n`	Which integer to
`by.line`	If `FALSE`, the default, each row of the `data.table` returned has the entire contents of the argument in `extract` column. If `TRUE`, the contents is split as it is in the document; arguments over multiple lines in the document are split over multiple rows in the `data.table` returned.
`parsed_doc`	A parsed document (from `parse_tex`). `parse_tex`. Use this argument if the cost of running `parse_tex` is expensive (such as repeatedly over the same document).