From 79099a8654fbeef74699e147bceb3d5ebc1c540e Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Sun, 10 May 2020 23:01:14 -0400
Subject: [PATCH] Parsing positive integers.

---
 src/parser/parser.rs | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/parser/parser.rs b/src/parser/parser.rs
index 538e159..b4f533e 100644
--- a/src/parser/parser.rs
+++ b/src/parser/parser.rs
@@ -2,11 +2,11 @@ use nom::branch::alt;
 use nom::bytes::complete::escaped_transform;
 use nom::bytes::complete::is_a;
 use nom::bytes::complete::is_not;
-use nom::bytes::complete::{tag, take_until, take_until_parser_matches};
+use nom::bytes::complete::{tag, take_until, take_until_parser_matches, take_while};
 use nom::character::complete::line_ending;
 use nom::character::complete::multispace0;
 use nom::character::complete::one_of;
-use nom::character::complete::{space0, space1};
+use nom::character::complete::{digit1, space0, space1};
 use nom::combinator::all_consuming;
 use nom::combinator::map;
 use nom::combinator::opt;
@@ -122,6 +122,7 @@ pub struct Partial<'a> {
 pub enum RValue<'a> {
     RVPath(Path<'a>),
     RVString(String),
+    RVPositiveInteger(u64),
 }
 
 #[derive(Clone, Debug, PartialEq)]
@@ -210,6 +211,16 @@ fn path(i: &str) -> IResult<&str, Path> {
     ))(i)
 }
 
+fn postitive_integer_literal(i: &str) -> IResult<&str, RValue> {
+    map(
+        verify(
+            map(digit1, |number_string: &str| number_string.parse::<u64>()),
+            |parse_result| parse_result.is_ok(),
+        ),
+        |parsed_number| RValue::RVPositiveInteger(parsed_number.unwrap()),
+    )(i)
+}
+
 /// Either a literal or a path to a value
 fn rvalue(i: &str) -> IResult<&str, RValue> {
     alt((
@@ -906,6 +917,8 @@ mod tests {
         );
     }
 
+    // TODO: Add test for integer literals
+
     #[test]
     fn test_quoted_partial() {
         assert_eq!(