Continue parsing the pest output

src/commands.rs

@@ -209,6 +209,9 @@ pub struct Done {
 pub struct Task {
     pub title: String,
     pub when: Vec<Spec>,
+    pub from: Option<NaiveDate>,
+    pub until: Option<NaiveDate>,
+    pub except: Vec<NaiveDate>,
     pub done: Vec<Done>,
     pub desc: Option<String>,
 }
@@ -217,6 +220,9 @@ pub struct Task {
 pub struct Note {
     pub title: String,
     pub when: Vec<Spec>, // Should not be empty?
+    pub from: Option<NaiveDate>,
+    pub until: Option<NaiveDate>,
+    pub except: Vec<NaiveDate>,
     pub desc: Option<String>,
 }
 

src/parse.rs

@@ -1,10 +1,11 @@
 use std::result;
 
-use pest::error::Error;
+use chrono::NaiveDate;
+use pest::error::{Error, ErrorVariant};
 use pest::iterators::Pair;
-use pest::Parser;
+use pest::{Parser, Span};
 
-use crate::commands::{Command, Task};
+use crate::commands::{Birthday, BirthdaySpec, Command, Done, Note, Spec, Task};
 
 #[derive(pest_derive::Parser)]
 #[grammar = "parse/todayfile.pest"]
@@ -12,23 +13,213 @@ struct TodayfileParser;
 
 type Result<T> = result::Result<T, Error<Rule>>;
 
-pub fn parse(input: &str) -> Result<Vec<Command>> {
-    let mut pairs = TodayfileParser::parse(Rule::file, input)?;
-    let file = pairs.next().unwrap();
-    let commands = file.into_inner();
-    commands.map(parse_command).collect()
+fn fail<S: Into<String>, T>(span: Span, message: S) -> Result<T> {
+    Err(Error::new_from_span(
+        ErrorVariant::CustomError {
+            message: message.into(),
+        },
+        span,
+    ))
 }
 
-fn parse_command(p: Pair<Rule>) -> Result<Command> {
-    match p.as_rule() {
-        Rule::task => parse_task(p).map(Command::Task),
-        Rule::note => todo!(),
-        Rule::birthday => todo!(),
+fn parse_title(p: Pair<Rule>) -> Result<String> {
+    assert_eq!(p.as_rule(), Rule::title);
+    Ok(p.into_inner().next().unwrap().as_str().to_string())
+}
+
+fn parse_datum(p: Pair<Rule>) -> Result<NaiveDate> {
+    assert_eq!(p.as_rule(), Rule::datum);
+    let date_span = p.as_span();
+    let mut p = p.into_inner();
+
+    let year = p.next().unwrap().as_str().parse().unwrap();
+    let month = p.next().unwrap().as_str().parse().unwrap();
+    let day = p.next().unwrap().as_str().parse().unwrap();
+
+    assert_eq!(p.next(), None);
+
+    match NaiveDate::from_ymd_opt(year, month, day) {
+        Some(date) => Ok(date),
+        None => fail(date_span, "invalid date"),
+    }
+}
+
+#[derive(Default)]
+struct Options {
+    when: Vec<Spec>,
+    from: Option<NaiveDate>,
+    until: Option<NaiveDate>,
+    except: Vec<NaiveDate>,
+    done: Vec<Done>,
+}
+
+fn parse_date(p: Pair<Rule>, opts: &mut Options) -> Result<()> {
+    todo!()
+}
+
+fn parse_from(p: Pair<Rule>, opts: &mut Options) -> Result<()> {
+    todo!()
+}
+
+fn parse_until(p: Pair<Rule>, opts: &mut Options) -> Result<()> {
+    todo!()
+}
+
+fn parse_except(p: Pair<Rule>, opts: &mut Options) -> Result<()> {
+    todo!()
+}
+
+fn parse_done(p: Pair<Rule>, opts: &mut Options) -> Result<()> {
+    todo!()
+}
+
+fn parse_options(p: Pair<Rule>) -> Result<Options> {
+    assert!(matches!(
+        p.as_rule(),
+        Rule::task_options | Rule::note_options
+    ));
+
+    let mut opts = Options::default();
+    for opt in p.into_inner() {
+        match opt.as_rule() {
+            Rule::date => parse_date(opt, &mut opts)?,
+            Rule::from => parse_from(opt, &mut opts)?,
+            Rule::until => parse_until(opt, &mut opts)?,
+            Rule::except => parse_except(opt, &mut opts)?,
+            Rule::done => parse_done(opt, &mut opts)?,
             _ => unreachable!(),
         }
     }
 
-fn parse_task(p: Pair<Rule>) -> Result<Task> {
-    dbg!(p);
-    todo!()
+    Ok(opts)
+}
+
+fn parse_indented_line(p: Pair<Rule>) -> Result<String> {
+    assert_eq!(p.as_rule(), Rule::indented_line);
+    Ok(match p.into_inner().next() {
+        Some(rest) => {
+            assert_eq!(rest.as_rule(), Rule::rest);
+            rest.as_str().to_string()
+        }
+        None => "".to_string(),
+    })
+}
+
+fn parse_description(p: Pair<Rule>) -> Result<Option<String>> {
+    assert_eq!(p.as_rule(), Rule::description);
+
+    let lines = p
+        .into_inner()
+        .map(parse_indented_line)
+        .collect::<Result<Vec<String>>>()?;
+
+    // TODO Strip whitespace prefix
+
+    let desc = lines.join("\n");
+    Ok(Some(desc).filter(|s| !s.is_empty()))
+}
+
+fn parse_task(p: Pair<Rule>) -> Result<Task> {
+    assert_eq!(p.as_rule(), Rule::task);
+    let mut p = p.into_inner();
+
+    let title = parse_title(p.next().unwrap())?;
+    let opts = parse_options(p.next().unwrap())?;
+    let desc = parse_description(p.next().unwrap())?;
+
+    assert_eq!(p.next(), None);
+
+    Ok(Task {
+        title,
+        when: opts.when,
+        from: opts.from,
+        until: opts.until,
+        except: opts.except,
+        done: opts.done,
+        desc,
+    })
+}
+
+fn parse_note(p: Pair<Rule>) -> Result<Note> {
+    assert_eq!(p.as_rule(), Rule::task);
+    let mut p = p.into_inner();
+
+    let title = parse_title(p.next().unwrap())?;
+    let opts = parse_options(p.next().unwrap())?;
+    let desc = parse_description(p.next().unwrap())?;
+
+    assert_eq!(p.next(), None);
+    assert!(opts.done.is_empty());
+
+    Ok(Note {
+        title,
+        when: opts.when,
+        from: opts.from,
+        until: opts.until,
+        except: opts.except,
+        desc,
+    })
+}
+
+fn parse_bdatum(p: Pair<Rule>) -> Result<BirthdaySpec> {
+    assert_eq!(p.as_rule(), Rule::bdatum);
+    let span = p.as_span();
+    let p = p.into_inner().collect::<Vec<_>>();
+    assert!(p.len() == 2 || p.len() == 3);
+
+    let (y, m, d, year_known) = if p.len() == 3 {
+        let y = p[0].as_str().parse().unwrap();
+        let m = p[1].as_str().parse().unwrap();
+        let d = p[2].as_str().parse().unwrap();
+        (y, m, d, true)
+    } else {
+        let m = p[0].as_str().parse().unwrap();
+        let d = p[1].as_str().parse().unwrap();
+        (0, m, d, false)
+    };
+
+    let date = match NaiveDate::from_ymd_opt(y, m, d) {
+        Some(date) => Ok(date),
+        None => fail(span, "invalid date"),
+    }?;
+
+    Ok(BirthdaySpec { date, year_known })
+}
+
+fn parse_bdate(p: Pair<Rule>) -> Result<BirthdaySpec> {
+    assert_eq!(p.as_rule(), Rule::bdate);
+    parse_bdatum(p.into_inner().next().unwrap())
+}
+
+fn parse_birthday(p: Pair<Rule>) -> Result<Birthday> {
+    assert_eq!(p.as_rule(), Rule::birthday);
+    let mut p = p.into_inner();
+
+    let title = parse_title(p.next().unwrap())?;
+    let when = parse_bdate(p.next().unwrap())?;
+    let desc = parse_description(p.next().unwrap())?;
+
+    Ok(Birthday { title, when, desc })
+}
+
+fn parse_command(p: Pair<Rule>) -> Result<Command> {
+    assert_eq!(p.as_rule(), Rule::command);
+
+    let p = p.into_inner().next().unwrap();
+    match p.as_rule() {
+        Rule::task => parse_task(p).map(Command::Task),
+        Rule::note => parse_note(p).map(Command::Note),
+        Rule::birthday => parse_birthday(p).map(Command::Birthday),
+        _ => unreachable!(),
+    }
+}
+
+pub fn parse(input: &str) -> Result<Vec<Command>> {
+    let mut pairs = TodayfileParser::parse(Rule::file, input)?;
+    let file = pairs.next().unwrap();
+    file.into_inner()
+        // For some reason, the EOI in `file` always gets captured
+        .take_while(|p| p.as_rule() == Rule::command)
+        .map(parse_command)
+        .collect()
 }

src/parse/todayfile.pest

@@ -79,17 +79,21 @@ indented_line = { NEWLINE | WHITESPACE ~ rest ~ eol }
 
 description = { indented_line* }
 
+task_options = { (date | from | until | except | done)* }
+
 task = {
     "TASK"
     ~ title
-    ~ (date | from | until | except | done)*
+    ~ task_options
     ~ description
 }
 
+note_options = { (date | from | until | except)* }
+
 note = {
     "NOTE"
     ~ title
-    ~ (date | from | until | except | done)*
+    ~ note_options
     ~ description
 }