tth {tth}

R Interface to the tth/ttm TeX to HTML Converter

Description

Convert TeX or LaTeX markup to HTML or HTML+MathML. Works for snippets as well as complete documents.

Usage

tth(x, ..., fixup = TRUE, Sweave = TRUE, mode = NULL)
ttm(x, ..., fixup = TRUE, Sweave = TRUE, mode = NULL)

tth.control(a = FALSE, c = FALSE, d = FALSE, e = 2, f = NULL, g = FALSE,
  i = FALSE, j = NULL, L = TRUE, n = NULL, p = NULL, r = TRUE,
  t = FALSE, u = FALSE, w = NULL, y = 2, xmakeindxcmd = NULL, v = FALSE)

Arguments

x

character vector of (La)TeX code.

fixup

logical. Should the resulting code be fixed up by deleting blank or empty lines and by replacing certain math symbols (such as not lower/greater etc.)?

Sweave

logical. Should the Sweave code environments Sinput/Soutput be replaced by verabtim (and Schunk deleted) prior to conversion with tth/ttm?

mode

character. If this is set to "hex", "dec", or "named", the corresponding mode is enforced for all character entity references. See also the details.

...

arguments passed to tth.control.

a

logical. Attempt automatic picture environment conversion using latex2gif? Default omit.

c

logical. Prefix header "Content-type: text/HTML" (for direct web serving)?

d

logical. Disable definitions with delimited arguments? Default enable.

e

numeric specifying epsfbox handling: 0 no conversion, just ref. 1 convert to png/gif using user-supplied ps2png/gif. 2 (default) convert and include inline.

f

numeric specifying limit for built-up fraction nesting in display equations to 0 to 9. Default is 5. For tth only.

g

logical. Remove (instead of guessing intent of) font commands. Default guess font/size.

i

logical. Use italic font for equations (like TeX)? Default roman. For tth only.

j

numeric specifying index page length. Default is 20 lines.

L

logical or character. If logical: Should LaTeX commands (e.g., frac) be enabled without a docmentclass line? If character: The base file (no extension) for LaTeX auxiliary input.

n

numeric HTML title format control: 0 raw, 1 expand macros, 2 expand equations.

p

character specifying additional directories (paths) to search for input files.

r

logical. Raw HTML output (omit header and tail) for inclusion in other files?

t

logical. Display built-up items in textstyle equations? Default is inline. For tth only.

u

logical. Use unicode character encoding? Default is ISO-8859-1 (latin1).

w

numeric specifying HTML writing style. Default is no head/body tags, 0 no title, 1 single title only, head/body tags. 2 XHTML. For tth only.

y

numeric specifying equation style:1 compress vertically, 2 inline overaccents.

xmakeindxcmd

character specifying command for making index. Default is makeindex.

v

logical or numeric. Give verbose commentary? Verbosity level can also be 0 (none, same as FALSE), 1 (same as TRUE), 2 (even higher verbosity for debugging).

Details

tth and ttm are simple R wrapper functions, calling command line tools of the same name which either need to be provided by the R package tth or be installed on the system (and available in the search path). The command line tools have been written by Hutchinson (2017) and a detailed manual is available online at http://silas.psfc.mit.edu/tth/.

By default, the results of tth and ttm are processed further to accomodate the Sweave environments and fixup certain math symbols. Furthermore, optionally a particular mode for character entity references (mathematical symbols, greek letters, and other special characters) can be enforced. For example, the greek small letter mu can be represented in "named" mode (&mgr; or μ), in "hex" mode (μ) or "dec" model (μ). Plain tth employs "dec" mode while plain ttm employs "named" mode. But setting mode = "hex" would convert all character entity references to hex mode etc. See https://www.w3.org/TR/xml-entity-names/bycodes.html for the list of character entity references employed and https://html.spec.whatwg.org/multipage/named-characters.html for a somewhat nicer display.

Value

tth/ttm return a character vector with HTML code. tth.control returns a character vector with collapsed (non-default) control arguments.

References

Hutchinson IH (2022). TtH: The TeX to HTML Translator, Version 4.16. http://silas.psfc.mit.edu/tth/

Examples

tex <- c("This is \\textbf{bold} and this \\textit{italic}.",
  "Points on the unit circle: $x^2 + y^2 = 1$.")
tth(tex)
ttm(tex)

h0 <- "$H_0: \\mu_0 = 0$"
tth(h0)
tth(h0, mode = "hex")
tth(h0, mode = "named")
ttm(h0)
ttm(h0, mode = "hex")
ttm(h0, mode = "dec")