Start parsing expressions

src/commands.rs

@@ -1,4 +1,4 @@
-use chrono::{NaiveDate, NaiveDateTime};
+use chrono::NaiveDate;
 
 #[derive(Debug)]
 pub struct Time {
@@ -76,7 +76,7 @@ pub struct WeekdaySpec {
 }
 
 #[derive(Debug)]
-pub enum IntVar {
+pub enum Var {
     /// `j`, see <https://en.wikipedia.org/wiki/Julian_day>
     JulianDay,
     /// `y`
@@ -141,24 +141,6 @@ pub enum IntVar {
     Saturday,
     /// `sun`, always 7
     Sunday,
-}
-
-#[derive(Debug)]
-pub enum IntExpr {
-    Lit(i64),
-    Var(IntVar),
-    Paren(Box<IntVar>),
-    Neg(Box<IntExpr>),
-    Add(Box<IntExpr>, Box<IntExpr>),
-    Sub(Box<IntExpr>, Box<IntExpr>),
-    Mul(Box<IntExpr>, Box<IntExpr>),
-    Div(Box<IntExpr>, Box<IntExpr>),
-    Mod(Box<IntExpr>, Box<IntExpr>),
-    Ternary(Box<BoolExpr>, Box<IntExpr>, Box<IntExpr>),
-}
-
-#[derive(Debug)]
-pub enum BoolVar {
     /// `isWeekday`, whether the current day is one of mon-fri
     IsWeekday,
     /// `isWeekend`, whether the current day is one of sat-sun
@@ -168,27 +150,34 @@ pub enum BoolVar {
 }
 
 #[derive(Debug)]
-pub enum BoolExpr {
+pub enum Expr {
-    Lit(bool),
+    Lit(i64),
-    Var(BoolVar),
+    Var(Var),
-    Paren(Box<BoolVar>),
+    Paren(Box<Expr>),
-    Eq(Box<IntExpr>, Box<IntExpr>),
+    // Integer-y operations
-    Neq(Box<IntExpr>, Box<IntExpr>),
+    Neg(Box<Expr>),
-    Lt(Box<IntExpr>, Box<IntExpr>),
+    Add(Box<Expr>, Box<Expr>),
-    Lte(Box<IntExpr>, Box<IntExpr>),
+    Sub(Box<Expr>, Box<Expr>),
-    Gt(Box<IntExpr>, Box<IntExpr>),
+    Mul(Box<Expr>, Box<Expr>),
-    Gte(Box<IntExpr>, Box<IntExpr>),
+    Div(Box<Expr>, Box<Expr>),
-    Not(Box<BoolExpr>),
+    Mod(Box<Expr>, Box<Expr>),
-    And(Box<BoolExpr>, Box<BoolExpr>),
+    // Comparisons
-    Or(Box<BoolExpr>, Box<BoolExpr>),
+    Eq(Box<Expr>, Box<Expr>),
-    Xor(Box<BoolExpr>, Box<BoolExpr>),
+    Neq(Box<Expr>, Box<Expr>),
-    BEq(Box<BoolExpr>, Box<BoolExpr>),
+    Lt(Box<Expr>, Box<Expr>),
-    BNeq(Box<BoolExpr>, Box<BoolExpr>),
+    Lte(Box<Expr>, Box<Expr>),
+    Gt(Box<Expr>, Box<Expr>),
+    Gte(Box<Expr>, Box<Expr>),
+    // Boolean-y operations
+    Not(Box<Expr>),
+    And(Box<Expr>, Box<Expr>),
+    Or(Box<Expr>, Box<Expr>),
+    Xor(Box<Expr>, Box<Expr>),
 }
 
 #[derive(Debug)]
 pub struct FormulaSpec {
-    pub start: Option<BoolExpr>, // None: *
+    pub start: Option<Expr>, // None: *
     pub start_delta: Option<Delta>,
     pub start_time: Option<Time>,
     pub end: Option<Delta>,

src/parse.rs

@@ -4,11 +4,12 @@ use std::result;
 use chrono::NaiveDate;
 use pest::error::{Error, ErrorVariant};
 use pest::iterators::Pair;
+use pest::prec_climber::PrecClimber;
 use pest::{Parser, Span};
 
 use crate::commands::{
-    Birthday, BirthdaySpec, Command, DateSpec, Delta, DeltaStep, Done, FormulaSpec, Note, Spec,
+    Birthday, BirthdaySpec, Command, DateSpec, Delta, DeltaStep, Done, Expr, FormulaSpec, Note,
-    Task, Time, Weekday, WeekdaySpec,
+    Spec, Task, Time, Weekday, WeekdaySpec,
 };
 
 #[derive(pest_derive::Parser)]
@@ -30,11 +31,6 @@ fn fail<S: Into<String>, T>(span: Span, message: S) -> Result<T> {
     Err(error(span, message))
 }
 
-fn parse_number(p: Pair<Rule>) -> Result<i32> {
-    assert_eq!(p.as_rule(), Rule::number);
-    Ok(p.as_str().parse().unwrap())
-}
-
 fn parse_title(p: Pair<Rule>) -> Result<String> {
     assert_eq!(p.as_rule(), Rule::title);
     let p = p.into_inner().next().unwrap();
@@ -116,7 +112,7 @@ fn parse_amount(p: Pair<Rule>) -> Result<Amount> {
                     _ => unreachable!(),
                 })
             }
-            Rule::number => value = parse_number(p)?,
+            Rule::amount_value => value = p.as_str().parse().unwrap(),
             _ => unreachable!(),
         }
     }
@@ -274,6 +270,25 @@ fn parse_date_fixed(p: Pair<Rule>) -> Result<DateSpec> {
     Ok(spec)
 }
 
+fn parse_number(p: Pair<Rule>) -> Result<i32> {
+    assert_eq!(p.as_rule(), Rule::number);
+    Ok(p.as_str().parse().unwrap())
+}
+
+fn parse_term(p: Pair<Rule>) -> Expr {
+    todo!()
+}
+
+fn parse_op(l: Expr, p: Pair<Rule>, r: Expr) -> Expr {
+    todo!()
+}
+
+fn parse_expr(p: Pair<Rule>) -> Result<Expr> {
+    assert_eq!(p.as_rule(), Rule::expr);
+    let climber = PrecClimber::new(vec![todo!()]);
+    Ok(climber.climb(p.into_inner(), parse_term, parse_op))
+}
+
 fn parse_date_expr(p: Pair<Rule>) -> Result<FormulaSpec> {
     assert_eq!(p.as_rule(), Rule::date_expr);
     dbg!(p);

src/parse/todayfile.pest

@@ -3,8 +3,6 @@ WHITESPACE = _{ !eol ~ WHITE_SPACE }
 rest_some = { (!eol ~ ANY)+ }
 rest_any = { (!eol ~ ANY)* }
 
-number = @{ ASCII_DIGIT{1,9} } // Fits into an i32
-
 title = { WHITESPACE ~ rest_some ~ eol }
 
 year = @{ ASCII_DIGIT{4} }
@@ -20,7 +18,8 @@ time = ${ hour ~ ":" ~ minute }
 weekday = { "mon" | "tue" | "wed" | "thu" | "fri" | "sat" | "sun" }
 
 amount_sign = { "+" | "-" }
-amount = { amount_sign? ~ number? }
+amount_value = @{ ASCII_DIGIT{1,9} } // Fits into an i32
+amount = { amount_sign? ~ amount_value? }
 delta_weekdays = { amount ~ weekday }
 delta_minutes = { amount ~ "min" }
 delta_years = { amount ~ "y" }
@@ -42,20 +41,20 @@ delta = {
     )+
 }
 
+number = @{ ("+" | "-")? ~ ASCII_DIGIT{1,9} } // Fits into an i32
 paren_expr = { "(" ~ expr ~ ")" }
 boolean = { "true" | "false" }
 variable = {
     "j"
-    | "yl" | "yd" | "Yd" | "yw" | "Yw" | "y"
+    | "yl" | "yd" | "yD" | "yw" | "yW" | "y"
-    | "ml" | "md" | "Md" | "mw" | "Mw" | "m"
+    | "ml" | "md" | "mD" | "mw" | "mW" | "m"
     | "d" | "D"
     | "iy" | "iyl"
     | "wd"
     | "e"
-    | "mon" | "tue" | "wed" | "thu" | "fri" | "sat" | "sun"
     | "isWeekday" | "isWeekend" | "isLeapYear"
 }
-term = { paren_expr | number | boolean | variable }
+term = { paren_expr | number | boolean | weekday | variable }
 op = {
     "+" | "-" | "*" | "/" | "%"
     | "=" | "!="