From 49e14e27165ef5dd1884e6d31cd5ff39314118be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Mon, 2 Aug 2021 23:22:50 +0200
Subject: initial nom filter parsing

---
 cli/src/search.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'cli/src/search.rs')

diff --git a/cli/src/search.rs b/cli/src/search.rs
index d140caf..b11ee78 100644
--- a/cli/src/search.rs
+++ b/cli/src/search.rs
@@ -1,4 +1,5 @@
 use chrono::{naive::NaiveDate, Duration};
+use nom::{branch::alt, character::complete::char, combinator::map, sequence::tuple};
 use rust_decimal::Decimal;
 use std::str::FromStr;
 
@@ -98,6 +99,10 @@ impl Constraint {
             }
         }
     }
+
+    fn parse(i: &str) -> nom::IResult<&str, Self> {
+        todo!()
+    }
 }
 
 #[derive(Clone)]
@@ -107,6 +112,28 @@ pub enum Filter {
     Subtract(Constraint),
 }
 
+impl Filter {
+    fn parse(i: &str) -> nom::IResult<&str, Self> {
+        alt((
+            map(
+                tuple((
+                    char('+'),
+                    Constraint::parse,
+                )),
+                |(_, constraint)| Filter::Union(constraint)
+            ),
+            map(
+                tuple((
+                    char('-'),
+                    Constraint::parse,
+                )),
+                |(_, constraint)| Filter::Subtract(constraint)
+            ),
+            map(Constraint::parse, Filter::Intersect),
+        ))(i)
+    }
+}
+
 #[derive(Clone)]
 pub struct Search<'t> {
     filtered: Vec<usize>,
-- 
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