better Pos

src/common/parser.rs

@@ -1,7 +1,7 @@
 use nom::{
     branch::alt,
     bytes::complete::tag,
-    character::complete::{line_ending, space0, space1},
+    character::complete::{line_ending, space0, space1, u32},
     combinator::{eof, opt, value},
     error::ParseError,
     multi::many0,
@@ -34,6 +34,10 @@ where
     terminated(line, alt((line_ending, eof)))
 }
 
+pub fn usize<'a, E: ParseError<&'a str>>(input: &'a str) -> IResult<&'a str, usize, E> {
+    u32.map(|v| v as usize).parse(input)
+}
+
 pub fn true_false<'a, E: ParseError<&'a str>>(input: &'a str) -> IResult<&'a str, bool, E> {
     alt((value(true, tag("true")), value(false, tag("false"))))(input)
 }