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Import logic from crate md2tex

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Source: 25fa878ccc/src/lib.rs
This commit is contained in:
William Desportes 2022-10-03 17:40:16 +02:00
parent 958fd07bed
commit e6236810d3
Signed by: williamdes
GPG Key ID: 90A0EF1B8251A889
3 changed files with 249 additions and 7 deletions
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10
Cargo.lock generated
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@ -304,6 +304,15 @@ version = "0.4.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fbdcdcb6d86f71c5e97409ad45898af11cbc995b4ee8112d59095a28d376c935"
[[package]]
name = "convert_case"
version = "0.6.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ec182b0ca2f35d8fc196cf3404988fd8b8c739a4d270ff118a398feb0cbec1ca"
dependencies = [
"unicode-segmentation",
]
[[package]]
name = "core-foundation"
version = "0.9.3"
@ -1178,6 +1187,7 @@ name = "md2pdf"
version = "0.0.3"
dependencies = [
"clap 4.0.8",
"convert_case",
"lopdf",
"pretty_assertions",
"pulldown-cmark",

1
Cargo.toml
View File

@ -14,6 +14,7 @@ readme = "README.md"
tectonic = "0.9"
pulldown-cmark = "0.5.3"
clap = { version = "4.0.7", features = ["cargo"] }
convert_case = "0.6.0"
[lib]
name = "md2pdf"

245
src/lib.rs
View File

@ -1,3 +1,4 @@
use convert_case::{Case, Casing};
use pulldown_cmark::{Event, Parser, Tag};
pub const LATEX_HEADER: &str = r#"\documentclass{scrartcl}
@ -41,26 +42,83 @@ pub const LATEX_HEADER: &str = r#"\documentclass{scrartcl}
pub const LATEX_FOOTER: &str = "\n\\end{document}\n";
/// Used to keep track of current pulldown_cmark "event".
/// TODO: Is there a native pulldown_cmark method to do this?
#[derive(Debug)]
enum EventType {
//Code,
Emphasis,
Header,
//Html,
Strong,
Table,
TableHead,
Text,
}
struct CurrentType {
event_type: EventType,
}
/**
* Part of this function is Copyright Liam Beckman <liam@liambeckman.com> (license: MPL-2.0)
* Source: https://github.com/lbeckman314/md2tex/blob/25fa878ccce122c224c24659ee1c1dd30c8a5d51/src/lib.rs
*
*/
pub fn markdown_to_latex(markdown: String) -> String {
let mut output = String::from(LATEX_HEADER);
let parser = Parser::new(&markdown);
let mut header_value = String::new();
let mut current: CurrentType = CurrentType {
event_type: EventType::Text,
};
let mut cells = 0;
let mut equation_mode = false;
let mut buffer = String::new();
for event in parser {
match event {
Event::Start(Tag::Header(level)) => {
current.event_type = EventType::Header;
output.push_str("\n");
output.push_str("\\");
for _ in 1..level {
output.push_str("sub");
match level {
-1 => output.push_str("part{"),
0 => output.push_str("chapter{"),
1 => output.push_str("section{"),
2 => output.push_str("subsection{"),
3 => output.push_str("subsubsection{"),
4 => output.push_str("paragraph{"),
5 => output.push_str("subparagraph{"),
_ => eprintln!("header is out of range."),
}
output.push_str("section{");
}
Event::End(Tag::Header(_)) => output.push_str("}\n"),
Event::End(Tag::Header(_)) => {
output.push_str("}\n");
output.push_str("\\");
output.push_str("label{");
output.push_str(&header_value);
output.push_str("}\n");
Event::Start(Tag::Emphasis) => output.push_str("\\emph{"),
output.push_str("\\");
output.push_str("label{");
output.push_str(&header_value.to_case(Case::Kebab));
output.push_str("}\n");
}
Event::Start(Tag::Emphasis) => {
current.event_type = EventType::Emphasis;
output.push_str("\\emph{");
}
Event::End(Tag::Emphasis) => output.push_str("}"),
Event::Start(Tag::Strong) => output.push_str("\\textbf{"),
Event::Start(Tag::Strong) => {
current.event_type = EventType::Strong;
output.push_str("\\textbf{");
}
Event::End(Tag::Strong) => output.push_str("}"),
Event::Start(Tag::List(None)) => output.push_str("\\begin{itemize}\n"),
@ -69,6 +127,17 @@ pub fn markdown_to_latex(markdown: String) -> String {
Event::Start(Tag::List(Some(_))) => output.push_str("\\begin{enumerate}\n"),
Event::End(Tag::List(Some(_))) => output.push_str("\\end{enumerate}\n"),
Event::Start(Tag::Paragraph) => {
output.push_str("\n");
}
Event::End(Tag::Paragraph) => {
// ~ adds a space to prevent
// "There's no line here to end" error on empty lines.
output.push_str(r"~\\");
output.push_str("\n");
}
Event::Start(Tag::Link(_, url, _)) => {
output.push_str("\\href{");
output.push_str(&*url);
@ -79,6 +148,95 @@ pub fn markdown_to_latex(markdown: String) -> String {
output.push_str("}");
}
Event::Start(Tag::Table(_)) => {
current.event_type = EventType::Table;
let table_start = vec![
"\n",
r"\begingroup",
r"\setlength{\LTleft}{-20cm plus -1fill}",
r"\setlength{\LTright}{\LTleft}",
r"\begin{longtable}{!!!}",
r"\hline",
r"\hline",
"\n",
];
for element in table_start {
output.push_str(element);
output.push_str("\n");
}
}
Event::Start(Tag::TableHead) => {
current.event_type = EventType::TableHead;
}
Event::End(Tag::TableHead) => {
output.truncate(output.len() - 2);
output.push_str(r"\\");
output.push_str("\n");
output.push_str(r"\hline");
output.push_str("\n");
// we presume that a table follows every table head.
current.event_type = EventType::Table;
}
Event::End(Tag::Table(_)) => {
let table_end = vec![
r"\arrayrulecolor{black}\hline",
r"\end{longtable}",
r"\endgroup",
"\n",
];
for element in table_end {
output.push_str(element);
output.push_str("\n");
}
let mut cols = String::new();
for _i in 0..cells {
cols.push_str(&format!(
r"C{{{width}\textwidth}} ",
width = 1. / cells as f64
));
}
output = output.replace("!!!", &cols);
cells = 0;
current.event_type = EventType::Text;
}
Event::Start(Tag::TableCell) => match current.event_type {
EventType::TableHead => {
output.push_str(r"\bfseries{");
}
_ => (),
},
Event::End(Tag::TableCell) => {
match current.event_type {
EventType::TableHead => {
output.push_str(r"}");
cells += 1;
}
_ => (),
}
output.push_str(" & ");
}
Event::Start(Tag::TableRow) => {
current.event_type = EventType::Table;
}
Event::End(Tag::TableRow) => {
output.truncate(output.len() - 2);
output.push_str(r"\\");
output.push_str(r"\arrayrulecolor{lightgray}\hline");
output.push_str("\n");
}
Event::Start(Tag::Image(_, path, title)) => {
output.push_str("\\begin{figure}\n");
output.push_str("\\centering\n");
@ -105,16 +263,89 @@ pub fn markdown_to_latex(markdown: String) -> String {
Event::End(Tag::CodeBlock(_)) => {
output.push_str("\n\\end{lstlisting}\n");
current.event_type = EventType::Text;
}
Event::Code(t) => {
output.push_str("\\lstinline|");
match current.event_type {
EventType::Header => output
.push_str(&*t.replace("#", r"\#").replace("…", "...").replace("З", "3")),
_ => output
.push_str(&*t.replace("…", "...").replace("З", "3").replace("<EFBFBD>", r"\<5C>")),
}
output.push_str("|");
}
Event::Text(t) => {
output.push_str(&*t);
// if "\(" or "\[" are encountered, then begin equation
// and don't replace any characters.
let delim_start = vec![r"\(", r"\["];
let delim_end = vec![r"\)", r"\]"];
if buffer.len() > 100 {
buffer.clear();
}
buffer.push_str(&t.clone().into_string());
match current.event_type {
EventType::Strong
| EventType::Emphasis
| EventType::Text
| EventType::Header
| EventType::Table => {
// TODO more elegant way to do ordered `replace`s (structs?).
if delim_start
.into_iter()
.any(|element| buffer.contains(element))
{
let popped = output.pop().unwrap();
if popped != '\\' {
output.push(popped);
}
output.push_str(&*t);
equation_mode = true;
} else if delim_end
.into_iter()
.any(|element| buffer.contains(element))
|| equation_mode == true
{
let popped = output.pop().unwrap();
if popped != '\\' {
output.push(popped);
}
output.push_str(&*t);
equation_mode = false;
} else {
output.push_str(
&*t.replace(r"\", r"\\")
.replace("&", r"\&")
.replace(r"\s", r"\textbackslash{}s")
.replace(r"\w", r"\textbackslash{}w")
.replace("_", r"\_")
.replace(r"\<", "<")
.replace(r"%", r"\%")
.replace(r"$", r"\$")
.replace(r"—", "---")
.replace("#", r"\#"),
);
}
header_value = t.into_string();
}
_ => output.push_str(&*t),
}
}
Event::SoftBreak => {
output.push('\n');
}
Event::HardBreak => {
output.push_str(r"\\");
output.push('\n');
}
_ => (),
}
}