diff --git a/src/converter.rs b/src/converter.rs
index 144df2c..e92e672 100644
--- a/src/converter.rs
+++ b/src/converter.rs
@@ -4,6 +4,7 @@ use roxmltree::{Node, TextPos};
 use thiserror::Error;
 
 use crate::types::Module;
+use crate::parser::{ParsePrefixedU32, ParsePrefixedU32Error};
 
 #[derive(Debug, Error)]
 pub enum DomConversionError {
@@ -61,34 +62,6 @@ impl DomConversionError {
     }
 }
 
-#[derive(Debug, Error)]
-pub enum ParsePrefixedU32Error {
-    #[error("invalid prefix: found {found}")]
-    InvalidPrefix { found: char },
-    #[error("parse int error")]
-    ParseIntError(#[from] num::ParseIntError),
-}
-
-trait ParsePrefixedU32 {
-    fn parse_prefixed_u32(&self) -> Result<u32, ParsePrefixedU32Error>;
-}
-
-impl ParsePrefixedU32 for &str {
-    fn parse_prefixed_u32(&self) -> Result<u32, ParsePrefixedU32Error> {
-        let radix = match self.chars().nth(1) {
-            Some('x') => 16,
-            Some(c) if c.is_numeric() => 10,
-            Some(c) => return Err(ParsePrefixedU32Error::InvalidPrefix { found: c }),
-            None => return Err(ParsePrefixedU32Error::InvalidPrefix { found: ' ' }),
-        };
-
-        match radix {
-            10 => Ok(self.parse()?),
-            radix => Ok(u32::from_str_radix(&self[2..], radix)?),
-        }
-    }
-}
-
 impl Module {
     pub fn from_xml_dom(root: Node) -> Result<Self, DomConversionError> {
         assert!(root.parent().unwrap().is_root());
diff --git a/src/lib.rs b/src/lib.rs
index 63abe1f..8d84cd2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,3 @@
 pub mod types;
+pub mod parser;
 pub mod converter;
diff --git a/src/parser.rs b/src/parser.rs
new file mode 100644
index 0000000..b5759f2
--- /dev/null
+++ b/src/parser.rs
@@ -0,0 +1,47 @@
+//! Module for converting XML custom token string to rust types.
+
+use std::num;
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ParsePrefixedU32Error {
+    #[error("invalid prefix: found {found}")]
+    InvalidPrefix { found: char },
+    #[error("parse int error")]
+    ParseIntError(#[from] num::ParseIntError),
+}
+
+pub(crate) trait ParsePrefixedU32 {
+    fn parse_prefixed_u32(&self) -> Result<u32, ParsePrefixedU32Error>;
+}
+
+impl ParsePrefixedU32 for &str {
+    fn parse_prefixed_u32(&self) -> Result<u32, ParsePrefixedU32Error> {
+        let radix = match self.chars().nth(1) {
+            Some('x') => 16,
+            Some(c) if c.is_numeric() => 10,
+            Some(c) => return Err(ParsePrefixedU32Error::InvalidPrefix { found: c }),
+            None => return Err(ParsePrefixedU32Error::InvalidPrefix { found: ' ' }),
+        };
+
+        match radix {
+            10 => Ok(self.parse()?),
+            radix => Ok(u32::from_str_radix(&self[2..], radix)?),
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::ParsePrefixedU32;
+
+    #[test]
+    fn parse_prefixed_u32() {
+        assert_eq!("0xdeadbeef".parse_prefixed_u32().unwrap(), 0xdeadbeef);
+        assert_eq!("0xDEADBEEF".parse_prefixed_u32().unwrap(), 0xdeadbeef);
+        assert_eq!("1234".parse_prefixed_u32().unwrap(), 1234);
+
+        assert!("0abcde".parse_prefixed_u32().is_err());
+    }
+}