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A git-based task manager
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Rust
at feat/parser
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use crate::{errors::Error, workspace::Id};use colored::Colorize;
#[derive(Debug, Eq, PartialEq)]enum ParserOpcode { // Started by ` =`, terminated by `= Highlight(usize), // Started by ` [`, terminated by `](` Linktext(usize), // Started by `](`, terminated by `) `, must immedately follow a Linktext Link(usize), // Used to signal to the parser that the Linktext parsed properly and we should parse the // subsequent ( character as a LinkJoin, // Started by ` [[`, terminated by `]] ` InternalLink(usize), // Started by ` *`, terminated by `* ` Italics(usize), // Started by ` !`, termianted by `!` Bold(usize), // Started by ` _`, terminated by `_ ` Underline(usize), // Started by ` -`, terminated by `- ` Strikethrough(usize), // Started by `_ `, terminated by `_` UnorderedList(usize, u8), // Started by `^\w+1.`, terminated by `\n` OrderedList(usize, u8), // Started by `^`````, terminated by a [`ParserOpcode::BlockEnd`] BlockStart(usize), // Started by `$````, is terminal itself. It must appear on its own line and be preceeded by a // `\n` and followed by a `\n` BlockEnd(usize), // Started by ` ``, terminated by `` ` or `\n` InlineBlock(usize), // Started by `^\w+>`, terminated by `\n` Blockquote(usize),}
pub(crate) struct ParsedTask { content: String, outgoing_internal_links: Vec<Id>, links: Vec<Url>,}
pub(crate) fn parse(s: &str) -> Option<ParsedTask> { let mut out = String::with_capacity(s.len()); let mut ops: Vec<ParserOpcode> = Vec::new(); let mut stream = s.char_indices().peekable(); let outgoing_internal_links = Vec::new(); let mut links = Vec::new(); loop { use ParserOpcode::*; match stream.next() { // there will always be an op code in the stack Some((pos, c)) => match dbg!((ops.last(), c)) { // Highlight terminal (Some(Highlight(start)), '=') => { out.push_str(&s[start + 1..=pos - 1].reversed().to_string()); // reduce ops.pop(); } // Highlight start (op, '=') => { ops.push(Highlight(pos)); } (Some(Linktext(start)), ']') => match stream.peek() { Some((_, '(')) => { out.push_str(&s[start + 1..=pos - 1].bright_blue().underline().to_string()); ops.pop(); ops.push(LinkJoin) } // Terminal for internal link Some((_, ']')) => { out.push_str(&s[start + 1..=pos - 1].green().bold().to_string()); ops.pop(); } _ => (), }, (Some(Link(start)), ')') => { if let Ok(uri) = Url::parse(&s[start + 1..=pos - 1]) { links.push(uri); } } (op, '[') => { if let Some(op) = op { ops.push(op); } ops.push(Linktext(pos)); } (Some(LinkJoin), '(') => { ops.push(Link(pos)); } (None | Some(_), c) => out.push(c), }, None => match ops.pop() { Some( Plain(start) | Highlight(start) | Linktext(start) | Link(start) | InternalLink(start) | Italics(start) | Bold(start) | Underline(start) | Strikethrough(start), ) => { // We have an return None; } None => { break; } Some(LinkJoin) => unreachable!(), Some(UnorderedList(_, _)) => todo!(), Some(OrderedList(_, _)) => todo!(), Some(BlockStart(_)) => todo!(), Some(BlockEnd(_)) => todo!(), Some(InlineBlock(_)) => todo!(), Some(Blockquote(_)) => todo!(), }, } } Some(ParsedTask { content: out, outgoing_internal_links, links, })}
#[cfg(test)]mod test { use super::*; #[test] fn test_highlight() { let input = "hello =world="; let output = parse(input).expect("parse to work"); assert_eq!("hello \u{1b}[7mworld\u{1b}[0m", output.content); }
#[test] fn test_highlight_bad() { let input = "hello =world"; let output = parse(input).expect("parse to work"); assert_eq!("hello =world", output.content); }
#[test] fn test_link() { let input = "hello [world](https://ngp.computer)"; let output = parse(input).expect("parse to work"); assert_eq!( &[Url::parse("https://ngp.computer").unwrap()], output.links.as_slice() ); assert_eq!("hello \u{1b}[4;94mworld\u{1b}[0m", output.content); }
#[ignore = "Known styling bug"] #[test] fn test_link_no_terminal_link() { let input = "hello [world](https://ngp.computer"; let output = parse(input).expect("parse to work"); assert!(output.links.len() == 0); assert_eq!(input, output.content); } #[test] fn test_link_bad_no_start_link() { let input = "hello [world]https://ngp.computer)"; let output = parse(input).expect("parse to work"); assert!(output.links.len() == 0); assert_eq!(input, output.content); } #[test] fn test_link_bad_no_link() { let input = "hello [world]"; let output = parse(input).expect("parse to work"); assert!(output.links.len() == 0); assert_eq!(input, output.content); }}