Implement snomed usage data

Cargo.toml

@@ -2,6 +2,7 @@
 members = [
     "rust/codelist-rs",
     "rust/codelist-validator-rs",
+    "rust/codelist-builder-rs",
     "bindings/python",
     "bindings/r/src/rust"
 ]

bindings/python/src/codelist.rs

@@ -458,7 +458,7 @@ impl PyCodeList {
         match custom_regex {
             Some(regex_str) => {
                 let regex = Regex::new(&regex_str)
-                    .map_err(|e| PyValueError::new_err(format!("Invalid regex: {}", e)))?;
+                    .map_err(|e| PyValueError::new_err(format!("Invalid regex: {e}")))?;
                 self.inner
                     .validate_codes(Some(&regex))
                     .map_err(|e| PyValueError::new_err(e.to_string()))?

rust/codelist-builder-rs/Cargo.toml

@@ -8,7 +8,13 @@ description = "Builder library for medical codelists"
 [dependencies]
 codelist-rs = { path = "../codelist-rs" }
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
 thiserror = { version = "2.0.9" }
 thiserror-ext = { version = "0.2.1" }
+reqwest = { version = "0.12.2" }
+csv = { version = "1.3.1" }
+async-trait = "0.1"
 
-
+[dev-dependencies]
+tokio = { version = "1.0", features = ["full"] }
+wiremock = { version = "0.6.4" }

rust/codelist-builder-rs/src/errors.rs

@@ -0,0 +1,24 @@
+//! This file contains custom errors for the codelist-builder library
+
+/// Enum to represent the different types of errors that can occur in the
+/// codelist-builder library
+
+#[derive(Debug, thiserror::Error, thiserror_ext::Construct)]
+pub enum CodeListBuilderError {
+    #[error("Invalid usage year: {name}")]
+    InvalidUsageYear { name: String },
+
+    #[error("Invalid usage data: {name}")]
+    InvalidUsageData { name: String },
+
+    #[error("HTTP error code: {code}: {body}")]
+    HttpErrorCode { code: String, body: String },
+
+    #[error("HTTP request error: {0}")]
+    #[construct(skip)]
+    ReqwestError(#[from] reqwest::Error),
+
+    #[error("CSV error: {0}")]
+    #[construct(skip)]
+    CSVError(#[from] csv::Error),
+}

rust/codelist-builder-rs/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod errors;
+pub mod snomed_usage_data;
+pub mod usage_year;