add files

azalea-core/src/resource_location.rs

@@ -0,0 +1,58 @@
+//! A resource, like minecraft:stone
+
+pub struct ResourceLocation<'a> {
+    pub namespace: &'a str,
+    pub path: &'a str,
+}
+
+static DEFAULT_NAMESPACE: &str = "minecraft";
+// static REALMS_NAMESPACE: &str = "realms";
+
+impl<'a> ResourceLocation<'a> {
+    pub fn new(resource_string: &str) -> Result<ResourceLocation, String> {
+        let sep_byte_position_option = resource_string.chars().position(|c| c == ':');
+        let (namespace, path) = if let Some(sep_byte_position) = sep_byte_position_option {
+            if sep_byte_position == 0 {
+                (DEFAULT_NAMESPACE, &resource_string[1..])
+            } else {
+                (
+                    &resource_string[..sep_byte_position],
+                    &resource_string[sep_byte_position + 1..],
+                )
+            }
+        } else {
+            (DEFAULT_NAMESPACE, resource_string)
+        };
+        Ok(ResourceLocation { namespace, path })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn basic_resource_location() {
+        let r = ResourceLocation::new("abcdef:ghijkl").unwrap();
+        assert_eq!(r.namespace, "abcdef");
+        assert_eq!(r.path, "ghijkl");
+    }
+    #[test]
+    fn no_namespace() {
+        let r = ResourceLocation::new("azalea").unwrap();
+        assert_eq!(r.namespace, "minecraft");
+        assert_eq!(r.path, "azalea");
+    }
+    #[test]
+    fn colon_start() {
+        let r = ResourceLocation::new(":azalea").unwrap();
+        assert_eq!(r.namespace, "minecraft");
+        assert_eq!(r.path, "azalea");
+    }
+    #[test]
+    fn colon_end() {
+        let r = ResourceLocation::new("azalea:").unwrap();
+        assert_eq!(r.namespace, "azalea");
+        assert_eq!(r.path, "");
+    }
+}