l10n: replace the hash table by a long match per file to faciliate the lookup

Author: sylvestre

src/uucore/build.rs

@@ -18,16 +18,15 @@ pub fn main() -> Result<(), Box<dyn std::error::Error>> {
         "// This file contains embedded English locale files"
     )?;
     writeln!(embedded_file)?;
-    writeln!(embedded_file, "use std::collections::HashMap;")?;
+    // No imports needed for match-based lookup
     writeln!(embedded_file)?;
 
-    // Start the function that returns embedded locales
+    // Generate optimized lookup function instead of HashMap
     writeln!(
         embedded_file,
-        "pub fn get_embedded_locales() -> HashMap<&'static str, &'static str> {{"
+        "pub fn get_embedded_locale(key: &str) -> Option<&'static str> {{"
     )?;
-    writeln!(embedded_file, "    let mut locales = HashMap::new();")?;
-    writeln!(embedded_file)?;
+    writeln!(embedded_file, "    match key {{")?;
 
     // Try to detect if we're building for a specific utility by checking build configuration
     // This attempts to identify individual utility builds vs multicall binary builds
@@ -44,8 +43,8 @@ pub fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     }
 
-    writeln!(embedded_file)?;
-    writeln!(embedded_file, "    locales")?;
+    writeln!(embedded_file, "        _ => None,")?;
+    writeln!(embedded_file, "    }}")?;
     writeln!(embedded_file, "}}")?;
 
     embedded_file.flush()?;
@@ -127,12 +126,11 @@ fn embed_single_utility_locale(
 
     if locale_path.exists() {
         let content = fs::read_to_string(&locale_path)?;
-        writeln!(embedded_file, "    // Locale for {util_name}")?;
+        writeln!(embedded_file, "        // Locale for {util_name}")?;
         writeln!(
             embedded_file,
-            "    locales.insert(\"{util_name}/en-US.ftl\", r###\"{content}\"###);"
+            "        \"{util_name}/en-US.ftl\" => Some(r###\"{content}\"###),"
         )?;
-        writeln!(embedded_file)?;
 
         // Tell Cargo to rerun if this file changes
         println!("cargo:rerun-if-changed={}", locale_path.display());
@@ -142,10 +140,10 @@ fn embed_single_utility_locale(
     let uucore_locale_path = project_root.join("src/uucore/locales/en-US.ftl");
     if uucore_locale_path.exists() {
         let content = fs::read_to_string(&uucore_locale_path)?;
-        writeln!(embedded_file, "    // Common uucore locale")?;
+        writeln!(embedded_file, "        // Common uucore locale")?;
         writeln!(
             embedded_file,
-            "    locales.insert(\"uucore/en-US.ftl\", r###\"{content}\"###);"
+            "        \"uucore/en-US.ftl\" => Some(r###\"{content}\"###),"
         )?;
         println!("cargo:rerun-if-changed={}", uucore_locale_path.display());
     }
@@ -185,12 +183,11 @@ fn embed_all_utility_locales(
         let locale_path = src_uu_dir.join(util_name).join("locales/en-US.ftl");
         if locale_path.exists() {
             let content = fs::read_to_string(&locale_path)?;
-            writeln!(embedded_file, "    // Locale for {util_name}")?;
+            writeln!(embedded_file, "        // Locale for {util_name}")?;
             writeln!(
                 embedded_file,
-                "    locales.insert(\"{util_name}/en-US.ftl\", r###\"{content}\"###);"
+                "        \"{util_name}/en-US.ftl\" => Some(r###\"{content}\"###),"
             )?;
-            writeln!(embedded_file)?;
 
             // Tell Cargo to rerun if this file changes
             println!("cargo:rerun-if-changed={}", locale_path.display());
@@ -201,10 +198,10 @@ fn embed_all_utility_locales(
     let uucore_locale_path = project_root.join("src/uucore/locales/en-US.ftl");
     if uucore_locale_path.exists() {
         let content = fs::read_to_string(&uucore_locale_path)?;
-        writeln!(embedded_file, "    // Common uucore locale")?;
+        writeln!(embedded_file, "        // Common uucore locale")?;
         writeln!(
             embedded_file,
-            "    locales.insert(\"uucore/en-US.ftl\", r###\"{content}\"###);"
+            "        \"uucore/en-US.ftl\" => Some(r###\"{content}\"###),"
         )?;
         println!("cargo:rerun-if-changed={}", uucore_locale_path.display());
     }
@@ -220,7 +217,7 @@ fn embed_static_utility_locales(
 
     writeln!(
         embedded_file,
-        "    // Static utility locales for crates.io builds"
+        "        // Static utility locales for crates.io builds"
     )?;
 
     let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap_or_default();
@@ -232,12 +229,11 @@ fn embed_static_utility_locales(
     let uucore_locale_file = Path::new(&manifest_dir).join("locales/en-US.ftl");
     if uucore_locale_file.is_file() {
         let content = std::fs::read_to_string(&uucore_locale_file)?;
-        writeln!(embedded_file, "    // Common uucore locale")?;
+        writeln!(embedded_file, "        // Common uucore locale")?;
         writeln!(
             embedded_file,
-            "    locales.insert(\"uucore/en-US.ftl\", r###\"{content}\"###);"
+            "        \"uucore/en-US.ftl\" => Some(r###\"{content}\"###),"
         )?;
-        writeln!(embedded_file)?;
     }
 
     // Collect and sort for deterministic builds
@@ -255,12 +251,11 @@ fn embed_static_utility_locales(
                     let locale_file = entry.path().join("locales/en-US.ftl");
                     if locale_file.is_file() {
                         let content = std::fs::read_to_string(&locale_file)?;
-                        writeln!(embedded_file, "    // Locale for {util_name}")?;
+                        writeln!(embedded_file, "        // Locale for {util_name}")?;
                         writeln!(
                             embedded_file,
-                            "    locales.insert(\"{util_name}/en-US.ftl\", r###\"{content}\"###);"
+                            "        \"{util_name}/en-US.ftl\" => Some(r###\"{content}\"###),"
                         )?;
-                        writeln!(embedded_file)?;
                     }
                 }
             }

src/uucore/src/lib/mods/locale.rs

@@ -235,20 +235,18 @@ fn create_english_bundle_from_embedded(
         ));
     }
 
-    let embedded_locales = get_embedded_locales();
     let mut bundle = FluentBundle::new(vec![locale.clone()]);
     bundle.set_use_isolating(false);
 
     // First, try to load common uucore strings
-    let uucore_key = "uucore/en-US.ftl";
-    if let Some(uucore_content) = embedded_locales.get(uucore_key) {
+    if let Some(uucore_content) = get_embedded_locale("uucore/en-US.ftl") {
         let uucore_resource = parse_fluent_resource(uucore_content)?;
         bundle.add_resource_overriding(uucore_resource);
     }
 
     // Then, try to load utility-specific strings
     let locale_key = format!("{util_name}/en-US.ftl");
-    if let Some(ftl_content) = embedded_locales.get(locale_key.as_str()) {
+    if let Some(ftl_content) = get_embedded_locale(&locale_key) {
         let resource = parse_fluent_resource(ftl_content)?;
         bundle.add_resource_overriding(resource);
     }