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|
use regex::Regex;
use std::str;
#[derive(PartialOrd, Ord, PartialEq, Eq, Clone, Debug)]
pub enum Org {
Unknown(String),
Header(u16, String),
Properties(Vec<(String, String)>),
}
type OrgDocument = Vec<Org>;
macro_rules! matchers {
(
$($id:ident <- $e:expr;)*
) => {
lazy_static! {
$(static ref $id: Regex = Regex::new($e).unwrap();)*
}
}
}
matchers! {
header <- r"^(\*+) (.*)";
properties_start <- r"^\s*:PROPERTIES:\s*$";
property <- r"^\s*:([^:]*): (.*)$";
properties_end <- r"^\s*:END:\s*$";
}
struct Parser<I: Iterator<Item = String>> {
doc: OrgDocument,
iter: I,
}
impl<I: Iterator<Item = String>> Parser<I> {
fn go(&mut self) {
while let Some(line) = self.iter.next() {
if let Some(g) = header.captures(&line) {
self.doc.push(Org::Header(
g.get(1).unwrap().as_str().len() as u16,
g.get(2).unwrap().as_str().to_string(),
));
} else if properties_start.is_match(&line) {
&mut self.go_properties(line.clone());
} else {
self.doc.push(Org::Unknown(line.to_string()));
}
}
}
fn go_properties(&mut self, first_line: String) {
let mut fallback = vec![first_line];
let mut properties = vec![];
while let Some(line) = self.iter.next() {
fallback.push(line.clone());
if let Some(g) = property.captures(&line) {
properties.push((
g.get(1).unwrap().as_str().to_string(),
g.get(2).unwrap().as_str().to_string(),
));
} else if properties_end.is_match(&line) {
break;
} else {
self.doc.push(Org::Unknown(fallback.join("\n")));
return;
}
}
self.doc.push(Org::Properties(properties));
}
}
pub fn parse(input: &str) -> OrgDocument {
let mut parser = Parser {
doc: vec![],
iter: input.split('\n').map(|line| line.to_string()),
};
parser.go();
parser.doc
}
pub fn print(doc: OrgDocument) -> String {
let mut result = vec![];
let mut current_level = 0;
for e in doc {
match e {
Org::Unknown(s) => result.push(s),
Org::Header(level, s) => {
current_level = level as usize;
result.push(format!("{} {}", "*".repeat(level as usize), s));
}
Org::Properties(_ps) => {
let indent = " ".repeat(current_level);
result.push(format!("{}:PROPERTIES:", indent));
for (key, val) in _ps {
result.push(format!("{}:{}: {}", indent, key, val));
}
result.push(format!("{}:END:", indent));
}
}
}
result.join("\n")
}
#[cfg(test)]
mod tests {
use super::*;
fn s<S: AsRef<str>>(m: S) -> String {
m.as_ref().to_string()
}
#[test]
fn parse_unknown() {
let doc = "hello\nhello";
assert_eq!(
parse(doc),
vec![
Org::Unknown("hello".to_string()),
Org::Unknown("hello".to_string()),
]
);
}
#[test]
fn parse_header() {
let doc = "** hello";
assert_eq!(parse(doc), vec![Org::Header(2, "hello".to_string())]);
assert_eq!(
parse(" * hello"),
vec![Org::Unknown(" * hello".to_string())]
);
}
#[test]
fn parse_properties() {
let doc = ":PROPERTIES:
:VERSION: 1.0
:ANIMAL: dog
:END:";
assert_eq!(
parse(doc),
vec![
Org::Properties(vec![(s("VERSION"), s("1.0")), (s("ANIMAL"), s("dog"))]),
]
);
let doc = ":PROPERTIES:\ninvalid\n:END:";
assert_eq!(
parse(doc),
vec![
Org::Unknown(s(":PROPERTIES:\ninvalid")),
Org::Unknown(s(":END:")),
]
);
}
#[test]
fn print_id() {
let doc = "* Hello
:PROPERTIES:
:FOO: 1
:END:
This is an org document.
** Another header
This is deep.
";
assert_eq!(doc, print(parse(doc)));
}
}
|
