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struct State {
active_id: Option<String>,
paragraphs: bool,
processed: String,
current: String,
escaped_html: bool,
last_blank: bool,
}
impl Default for State {
fn default() -> Self {
Self {
active_id: None,
paragraphs: true,
processed: String::new(),
current: String::new(),
escaped_html: false,
last_blank: true,
}
}
}
impl State {
/// Get an opening paragraph tag with any attributes currently set.
fn get_open_paragraph(&mut self) -> String {
match self.active_id.take() {
None => String::from("<p>"),
Some(id) => format!(r#"<p id="{id}">"#),
}
}
pub fn process_line(&mut self, line: &str) {
// we check !paragraphs here because we need to be able to enable it again
// and the easiest way right now seems to be to try to parse every
// non-paragraph line as a command
if (self.last_blank || !self.paragraphs) && self.parse_command(line) {
// don't set last_blank here. we want to be able to chain commands
return;
}
if !self.paragraphs || !line.is_empty() {
if !self.current.is_empty() {
self.current.push('\n');
}
let escaped = self.escape_line(line);
self.current.push_str(escaped);
self.last_blank = false;
} else {
// line is empty.
self.push_current();
}
}
pub fn done(mut self) -> String {
self.push_current();
self.processed
}
fn escape_line<'a>(&mut self, line: &'a str) -> &'a str {
if let Some(strip) = line.strip_prefix('\\') {
match strip.chars().next() {
Some('[') => strip,
Some('<') => {
if self.last_blank {
self.escaped_html = true;
}
strip
}
Some('\\') => strip,
_ => line,
}
} else {
line
}
}
/// Possibly parses a line as a command and mutates internal state.
/// # Returns
/// true if the line was a command, false otherwise.
fn parse_command(&mut self, line: &str) -> bool {
match line.strip_prefix('[') {
Some(line) => match line.strip_suffix(']') {
Some(cmd) => self.run_command(cmd),
None => false,
},
None => false,
}
}
fn run_command(&mut self, cmd: &str) -> bool {
match cmd.trim() {
"@paragraphs off" => {
self.push_current();
self.paragraphs = false;
true
}
"@paragraphs on" => {
self.push_current();
self.paragraphs = true;
true
}
annotation if cmd.starts_with('#') => {
self.active_id = Some(annotation[1..].to_owned());
true
}
_ => false,
}
}
fn push_current(&mut self) {
if !self.current.is_empty() {
// linebreak if there is already text pushed to final
if !self.processed.is_empty() {
self.processed.push('\n');
}
// wrap paragraphs if all of these are true:
// - we're supposed to be wrapping paragraphs
// - either of these is true:
// - the line does not start with <
// OR
// - the line starts with < AND it's been escaped
let should_paragraph = self.paragraphs
&& (!self.current.starts_with('<')
|| (self.current.starts_with('<') && self.escaped_html));
if should_paragraph {
let open = self.get_open_paragraph();
self.processed
.push_str(&format!("{open}\n{}\n</p>", self.current));
} else {
self.processed.push_str(&self.current);
}
// reset block dependant state
self.current.clear();
self.last_blank = true;
self.escaped_html = false;
}
}
}
pub fn process(raw: &str) -> String {
let mut state = State::default();
for line in raw.lines() {
state.process_line(line)
}
state.done()
}
#[cfg(test)]
mod test {
use crate::markup::process;
#[test]
fn parses_no_commands() {
let blk1 = "line one\nline two";
let blk2 = "block two";
assert_eq!(process(blk1), format!("<p>\n{blk1}\n</p>"));
let tst = format!("{blk1}\n\n{blk2}");
assert_eq!(
process(&tst),
format!("<p>\n{blk1}\n</p>\n<p>\n{blk2}\n</p>")
)
}
#[test]
fn parses_paragraph_off() {
let str = "[@paragraphs off]\none two\n\nthree\nfour";
assert_eq!(process(str), "one two\n\nthree\nfour")
}
#[test]
fn parses_adds_annotation() {
let str = "[#greeting]\nHello!";
assert_eq!(process(str), "<p id=\"greeting\">\nHello!\n</p>")
}
#[test]
fn doesnt_wrap_html() {
let str = "hello!\n\n<i>hi, how are you?</i>";
assert_eq!(process(str), "<p>\nhello!\n</p>\n<i>hi, how are you?</i>")
}
#[test]
fn correctly_escapes() {
let str = "\\[@paragraph on]\n\\<i>Hello!</i>\n\\\\Goodbye!";
let correct = "<p>\n[@paragraph on]\n<i>Hello!</i>\n\\Goodbye!\n</p>";
assert_eq!(process(str), correct)
}
#[test]
fn wraps_escaped_html() {
let str = "\\<i>test</i>";
let correct = "<p>\n<i>test</i>\n</p>";
assert_eq!(process(str), correct)
}
const BASE: &str = "test/markup";
fn test_files(test: &str) {
let input_path = format!("{BASE}/{test}/input.html");
let output_path = format!("{BASE}/{test}/output.html");
let input = std::fs::read_to_string(input_path).unwrap();
let output = std::fs::read_to_string(output_path).unwrap();
assert_eq!(process(&input), output)
}
#[test]
fn parses_onoff() {
test_files("paragraph toggle")
}
}
|
