LS: Partially revert #5214, remove error code book (#5224)

crates/cairo-lang-diagnostics/src/error_code.rs

@@ -22,12 +22,16 @@ impl ErrorCode {
     /// Format this error code in a way that is suitable for display in error message.
     ///
     /// ```
-    /// # use cairo_lang_diagnostics::{codes, error_code};
-    /// assert_eq!(error_code!(codes::UNUSED_VARIABLE).display_bracketed(), "[E0001]");
+    /// # use cairo_lang_diagnostics::error_code;
+    /// assert_eq!(error_code!(E0001).display_bracketed(), "[E0001]");
     /// ```
     pub fn display_bracketed(self) -> String {
         format!("[{}]", self)
     }
+
+    pub fn as_str(&self) -> &str {
+        self.0
+    }
 }
 
 impl fmt::Display for ErrorCode {
@@ -39,16 +43,16 @@ impl fmt::Display for ErrorCode {
 /// Constructs an [`ErrorCode`].
 ///
 /// ```
-/// # use cairo_lang_diagnostics::{codes, error_code, ErrorCode};
-/// let code: ErrorCode = error_code!(codes::UNUSED_VARIABLE);
+/// # use cairo_lang_diagnostics::{error_code, ErrorCode};
+/// let code: ErrorCode = error_code!(E0001);
 /// # assert_eq!(format!("{code}"), "E0001");
 /// ```
 #[macro_export]
 macro_rules! error_code {
     ($code:expr) => {{
         use $crate::ErrorCode;
         // NOTE: This is a magic trick to trigger the validation in compile time.
-        const ENSURE_CONST: ErrorCode = ErrorCode::new($code);
+        const ENSURE_CONST: ErrorCode = ErrorCode::new(stringify!($code));
         ENSURE_CONST
     }};
 }
@@ -62,16 +66,11 @@ impl OptionErrorCodeExt for Option<ErrorCode> {
     /// Format this error code in a way that is suitable for display in error message.
     ///
     /// ```
-    /// # use cairo_lang_diagnostics::{codes, error_code, OptionErrorCodeExt};
-    /// assert_eq!(Some(error_code!(codes::UNUSED_VARIABLE)).display_bracketed(), "[E0001]");
+    /// # use cairo_lang_diagnostics::{error_code, OptionErrorCodeExt};
+    /// assert_eq!(Some(error_code!(E0001)).display_bracketed(), "[E0001]");
     /// assert_eq!(None.display_bracketed(), "");
     /// ```
     fn display_bracketed(self) -> String {
         self.map(ErrorCode::display_bracketed).unwrap_or_default()
     }
 }
-
-pub mod codes {
-    /// Unused variable.
-    pub const UNUSED_VARIABLE: &str = "E0001";
-}

crates/cairo-lang-diagnostics/src/lib.rs

@@ -6,7 +6,7 @@ pub use diagnostics::{
     DiagnosticNote, Diagnostics, DiagnosticsBuilder, FormattedDiagnosticEntry, Maybe, Severity,
     ToMaybe, ToOption,
 };
-pub use error_code::{codes, ErrorCode, OptionErrorCodeExt};
+pub use error_code::{ErrorCode, OptionErrorCodeExt};
 pub use location_marks::get_location_marks;
 
 mod diagnostics;

crates/cairo-lang-language-server/src/lib.rs

@@ -21,7 +21,7 @@ use cairo_lang_defs::ids::{
     TraitItemId, TraitLongId, UseLongId,
 };
 use cairo_lang_diagnostics::{
-    codes, DiagnosticEntry, DiagnosticLocation, Diagnostics, Severity, ToOption,
+    DiagnosticEntry, DiagnosticLocation, Diagnostics, Severity, ToOption,
 };
 use cairo_lang_filesystem::cfg::{Cfg, CfgSet};
 use cairo_lang_filesystem::db::{
@@ -936,33 +936,64 @@ impl LanguageServer for Backend {
 
     #[tracing::instrument(level = "debug", skip_all, fields(uri = %params.text_document.uri))]
     async fn code_action(&self, params: CodeActionParams) -> LSPResult<Option<CodeActionResponse>> {
-        eprintln!("Code action");
         self.with_db(|db| {
             let mut actions = Vec::with_capacity(params.context.diagnostics.len());
             let file_id = file(db, params.text_document.uri.clone());
             let (node, _lookup_items) = get_node_and_lookup_items(db, file_id, params.range.start)?;
             for diagnostic in params.context.diagnostics.iter() {
-                let action = if let Some(NumberOrString::String(code)) = &diagnostic.code {
-                    match code.as_str() {
-                        codes::UNUSED_VARIABLE => unused_variable(
-                            db,
-                            &node,
-                            diagnostic.clone(),
-                            params.text_document.uri.clone(),
-                        ),
-                        _ => CodeAction::default(),
-                    }
-                } else {
-                    CodeAction::default()
-                };
-                actions.push(CodeActionOrCommand::from(action));
+                actions.extend(
+                    get_code_actions_for_diagnostic(db, &node, diagnostic, &params)
+                        .into_iter()
+                        .map(CodeActionOrCommand::from),
+                );
             }
             Some(actions)
         })
         .await
     }
 }
 
+/// Generate code actions for a given diagnostic.
+///
+/// # Arguments
+///
+/// * `db` - A reference to the Salsa database.
+/// * `node` - The syntax node where the diagnostic is located.
+/// * `diagnostic` - The diagnostic for which to generate code actions.
+/// * `params` - The parameters for the code action request.
+///
+/// # Returns
+///
+/// A vector of [`CodeAction`] objects that can be applied to resolve the diagnostic.
+fn get_code_actions_for_diagnostic(
+    db: &dyn SemanticGroup,
+    node: &SyntaxNode,
+    diagnostic: &Diagnostic,
+    params: &CodeActionParams,
+) -> Vec<CodeAction> {
+    let code = match &diagnostic.code {
+        Some(NumberOrString::String(code)) => code,
+        Some(NumberOrString::Number(code)) => {
+            debug!("diagnostic code is not a string: `{code}`");
+            return vec![];
+        }
+        None => {
+            debug!("diagnostic code is missing");
+            return vec![];
+        }
+    };
+
+    match code.as_str() {
+        "E0001" => {
+            vec![unused_variable(db, node, diagnostic.clone(), params.text_document.uri.clone())]
+        }
+        code => {
+            debug!("no code actions for diagnostic code: {code}");
+            vec![]
+        }
+    }
+}
+
 /// Create a code action that prefixes an unused variable with an `_`.
 #[tracing::instrument(level = "trace", skip_all)]
 fn unused_variable(

crates/cairo-lang-semantic/src/diagnostic.rs

@@ -8,7 +8,7 @@ use cairo_lang_defs::ids::{
 };
 use cairo_lang_defs::plugin::PluginDiagnostic;
 use cairo_lang_diagnostics::{
-    codes, error_code, DiagnosticAdded, DiagnosticEntry, DiagnosticLocation, Diagnostics,
+    error_code, DiagnosticAdded, DiagnosticEntry, DiagnosticLocation, Diagnostics,
     DiagnosticsBuilder, ErrorCode, Severity,
 };
 use cairo_lang_filesystem::ids::FileId;
@@ -1099,7 +1099,7 @@ pub enum SemanticDiagnosticKind {
 impl SemanticDiagnosticKind {
     pub fn error_code(&self) -> Option<ErrorCode> {
         Some(match &self {
-            Self::UnusedVariable => error_code!(codes::UNUSED_VARIABLE),
+            Self::UnusedVariable => error_code!(E0001),
             _ => return None,
         })
     }