R: Experimental Functions to Work with LaTeX Code

parseLatex {tools}

R Documentation

Experimental Functions to Work with LaTeX Code

Description

The parseLatex function parses LaTeX source, producing a structured object; deparseLatex reverses the process. The latexToUtf8 function takes a LaTeX object, and processes a number of different macros to convert them into the corresponding UTF-8 characters.

Usage

parseLatex(text, filename = deparse1(substitute(text)),
           verbose = FALSE,
           verbatim = c("verbatim", "verbatim*",
                        "Sinput", "Soutput"),
           verb = "\\Sexpr")
deparseLatex(x, dropBraces = FALSE)
latexToUtf8(x)

Arguments

`text`	A character vector containing LaTeX source code.
`filename`	A filename to use in syntax error messages.
`verbose`	If `TRUE`, print debug error messages.
`verbatim`	A character vector containing the names of LaTeX environments holding verbatim text.
`verb`	A character vector containing LaTeX macros that should be assumed to hold verbatim text.
`x`	A `"LaTeX"` object.
`dropBraces`	Drop unnecessary braces when displaying a `"LaTeX"` object.

Details

The parser does not recognize all legal LaTeX code, only relatively simple examples. It does not associate arguments with macros, that needs to be done after parsing, with knowledge of the definitions of each macro. The main intention for this function is to process simple LaTeX code used in bibliographic references, not fully general LaTeX documents.

Verbose text is allowed in three forms: the ⁠\verb⁠ macro (with single character delimiters), environments whose names are listed in the verbatim argument, and other macros (with brace delimiters) whose names are listed in the verb argument.

Value

The parseLatex() function returns a recursive object of class "LaTeX". Each of the entries in this object will have a "latex_tag" attribute identifying its syntactic role.

The deparseLatex() function returns a single element character vector, possibly containing embedded newlines.

The latexToUtf8() function returns a modified version of the "LaTeX" object that was passed to it.

Author(s)

Duncan Murdoch

Examples


latex <- parseLatex("fran\\c{c}ais")
deparseLatex(latexToUtf8(latex))

[Package tools version 4.4.0 Index]