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latex.jl
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latex.jl
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# This file is a part of Julia. License is MIT: https://julialang.org/license
export latex
function wrapblock(f, io, env)
println(io, "\\begin{", env, "}")
f()
println(io, "\\end{", env, "}")
end
function wrapinline(f, io, cmd)
print(io, "\\", cmd, "{")
f()
print(io, "}")
end
# Block elements
latex(io::IO, md::MD) = latex(io, md.content)
function latex(io::IO, content::Vector)
for c in content
latex(io, c)
end
end
function latex(io::IO, header::Header{l}) where l
tag = l < 4 ? "sub"^(l-1) * "section" : "sub"^(l-4) * "paragraph"
wrapinline(io, tag) do
latexinline(io, header.text)
end
println(io)
end
function latex(io::IO, code::Code)
if code.language == "styled"
code = Code("", String(styled(code.code)))
end
occursin("\\end{verbatim}", code.code) && error("Cannot include \"\\end{verbatim}\" in a latex code block")
wrapblock(io, "verbatim") do
println(io, code.code)
end
end
function latexinline(io::IO, code::Code)
wrapinline(io, "texttt") do
print(io, latexesc(code.code))
end
end
function latex(io::IO, md::Paragraph)
for mdc in md.content
latexinline(io, mdc)
end
println(io)
println(io)
end
function latex(io::IO, md::BlockQuote)
wrapblock(io, "quote") do
latex(io, md.content)
end
end
function latex(io::IO, f::Footnote)
print(io, "\\footnotetext[", f.id, "]{")
latex(io, f.text)
println(io, "}")
end
function latex(io::IO, md::Admonition)
wrapblock(io, "quote") do
wrapinline(io, "textbf") do
print(io, md.category)
end
println(io, "\n\n", md.title, "\n")
latex(io, md.content)
end
end
function latex(io::IO, md::List)
# `\begin{itemize}` is used here for both ordered and unordered lists since providing
# custom starting numbers for enumerated lists is simpler to do by manually assigning
# each number to `\item` ourselves rather than using `\setcounter{enumi}{<start>}`.
#
# For an ordered list starting at 5 the following will be generated:
#
# \begin{itemize}
# \item[5. ] ...
# \item[6. ] ...
# ...
# \end{itemize}
#
pad = ndigits(md.ordered + length(md.items)) + 2
fmt = n -> (isordered(md) ? "[$(rpad("$(n + md.ordered - 1).", pad))]" : "")
wrapblock(io, "itemize") do
for (n, item) in enumerate(md.items)
print(io, "\\item$(fmt(n)) ")
latex(io, item)
n < length(md.items) && println(io)
end
end
end
function latex(io::IO, md::HorizontalRule)
println(io, "\\rule{\\textwidth}{1pt}")
end
# Inline elements
function latexinline(io::IO, md::Vector)
for c in md
latexinline(io, c)
end
end
function latexinline(io::IO, md::AbstractString)
latexesc(io, md)
end
function latexinline(io::IO, md::Bold)
wrapinline(io, "textbf") do
latexinline(io, md.text)
end
end
function latexinline(io::IO, md::Italic)
wrapinline(io, "emph") do
latexinline(io, md.text)
end
end
function latexinline(io::IO, md::Image)
wrapblock(io, "figure") do
println(io, "\\centering")
wrapinline(io, "includegraphics") do
print(io, md.url)
end
println(io)
wrapinline(io, "caption") do
latexinline(io, md.alt)
end
println(io)
end
end
latexinline(io::IO, f::Footnote) = print(io, "\\footnotemark[", f.id, "]")
function latexinline(io::IO, md::Link)
wrapinline(io, "href") do
print(io, md.url)
end
print(io, "{")
latexinline(io, md.text)
print(io, "}")
end
const _latexescape_chars = Dict{Char, AbstractString}(
'~'=>"{\\textasciitilde}",
'^'=>"\\^{}",
'\\'=>"{\\textbackslash}")
for ch in "&%\$#_{}"
_latexescape_chars[ch] = "\\$ch"
end
function latexesc(io, s::AbstractString)
for ch in s
print(io, get(_latexescape_chars, ch, ch))
end
end
"""
latex([io::IO], md)
Output the contents of the Markdown object `md` in LaTeX format, either
writing to an (optional) `io` stream or returning a string.
One can alternatively use `show(io, "text/latex", md)` or `repr("text/latex", md)`.
# Examples
```jldoctest
julia> latex(md"hello _world_")
"hello \\\\emph{world}\\n\\n"
```
"""
latex(md) = sprint(latex, md)
latexinline(md) = sprint(latexinline, md)
latexesc(s) = sprint(latexesc, s)
show(io::IO, ::MIME"text/latex", md::MD) = latex(io, md)