From 1ac1641dc5a0e54e0362081c2113427f2e35a8cc Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 22 Oct 2017 21:47:14 +0200
Subject: Design syntax

---
 src/parser.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/parser.rs b/src/parser.rs
index 83c05a1..4820668 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -5,13 +5,34 @@
 //!
 //! # Syntax
 //!
+//! ## Units
 //!
+//! UnitSec   = "second" | "seconds" | "sec" | "secs" | "s"
+//! UnitMin   = "minute" | "minutes" | "min" | "mins"
+//! UnitHr    = "hour"   | "hours"   | "hr" | "hrs"
+//! UnitDay   = "day"    | "days"    | "d"
+//! UnitWeek  = "week"   | "weeks"   | "w"
+//! UnitMonth = "month"  | "months"  |
+//! UnitYear  = "year"   | "years"   | "yrs"
+//! Unit      = UnitSec | UnitMin | UnitHr | UnitDay | UnitWeek | UnitMonth | UnitYear
 //!
+//! ## Operators
 //!
+//! Operator  = "+" | "-"
 //!
+//! ## Intermediate syntax nodes
 //!
+//! Amount    = "<Number><Unit>"
 //!
+//! TextIterSpec = "secondly" | "minutely" | "hourly" | "daily" | "weekly" | "monthly" | "yearly"
+//! Iterspec     = TextIterSpec | "every" <Number><Unit>
 //!
+//! ## User-facing syntax nodes
+//!
+//! AmountExp = <Amount> (<Operator> <AmountExp>)?
+//! ExactDate = "today" | "yesterday" | "tomorrow" | <Iso8601>
+//! Date      = <ExactDate> (<Operator> <AmountExp>)?
+//! Iterator  = <Date> <Iterspec> ("until" <ExactDate> | <number> "times")?
 //!
 
 mod grammar {
-- 
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