add abbreviation method and fix clippy lints

Author: veeshi

build.rs

@@ -73,7 +73,7 @@ fn compile_table() -> CompiledTable {
 
 fn write_table(path: &Path, compiled_table: &CompiledTable) {
     let mut output =
-        File::create(&path).expect(&format!("unable to open {}", path.to_string_lossy()));
+        File::create(path).unwrap_or_else(|_| panic!("unable to open {}", path.to_string_lossy()));
 
     writeln!(output, "use crate::GeneralCategory;").unwrap();
     writeln!(output, "use crate::GeneralCategory::*;").unwrap();
@@ -89,7 +89,7 @@ fn write_table(path: &Path, compiled_table: &CompiledTable) {
     // Write out the blocks in address order
     writeln!(
         output,
-        "\nconst CATEGORY_BLOCKS: [GeneralCategory; {}] = [",
+        "\n#[allow(clippy::large_const_arrays)]\nconst CATEGORY_BLOCKS: [GeneralCategory; {}] = [",
         compiled_table.blocks.len() * block::SIZE
     )
     .unwrap();

src/category.rs

@@ -16,9 +16,8 @@ pub fn get_general_category(chr: char) -> GeneralCategory {
     let u = chr as u32;
 
     if u <= LAST_CODEPOINT {
-        return CATEGORY_BLOCKS
-            [CATEGORY_BLOCK_OFFSETS[u as usize >> SHIFT] as usize + (u as usize & MASK)];
+        CATEGORY_BLOCKS[CATEGORY_BLOCK_OFFSETS[u as usize >> SHIFT] as usize + (u as usize & MASK)]
     } else {
-        return PrivateUse;
+        PrivateUse
     }
 }

src/lib.rs

@@ -19,6 +19,46 @@ pub use tables::GeneralCategory;
 /// that this version of unicode-general-category was generated from.
 pub const UNICODE_VERSION: (u64, u64, u64) = (16, 0, 0);
 
+impl GeneralCategory {
+    /// Returns the general category abbreviation.
+    /// See [Unicode General Category Values](https://www.unicode.org/reports/tr44/tr44-30.html#General_Category_Values)
+    /// for the list of all general categories.
+    pub fn abbreviation(&self) -> &'static str {
+        match self {
+            GeneralCategory::ClosePunctuation => "Pe",
+            GeneralCategory::ConnectorPunctuation => "Pc",
+            GeneralCategory::Control => "Cc",
+            GeneralCategory::CurrencySymbol => "Sc",
+            GeneralCategory::DashPunctuation => "Pd",
+            GeneralCategory::DecimalNumber => "Nd",
+            GeneralCategory::EnclosingMark => "Me",
+            GeneralCategory::FinalPunctuation => "Pf",
+            GeneralCategory::Format => "Cf",
+            GeneralCategory::InitialPunctuation => "Pi",
+            GeneralCategory::LetterNumber => "Nl",
+            GeneralCategory::LineSeparator => "Zl",
+            GeneralCategory::LowercaseLetter => "Ll",
+            GeneralCategory::MathSymbol => "Sm",
+            GeneralCategory::ModifierLetter => "Lm",
+            GeneralCategory::ModifierSymbol => "Sk",
+            GeneralCategory::NonspacingMark => "Mn",
+            GeneralCategory::OpenPunctuation => "Ps",
+            GeneralCategory::OtherLetter => "Lo",
+            GeneralCategory::OtherNumber => "No",
+            GeneralCategory::OtherPunctuation => "Po",
+            GeneralCategory::OtherSymbol => "So",
+            GeneralCategory::ParagraphSeparator => "Zp",
+            GeneralCategory::PrivateUse => "Co",
+            GeneralCategory::SpaceSeparator => "Zs",
+            GeneralCategory::SpacingMark => "Mc",
+            GeneralCategory::Surrogate => "Cs",
+            GeneralCategory::TitlecaseLetter => "Lt",
+            GeneralCategory::Unassigned => "Cn",
+            GeneralCategory::UppercaseLetter => "Lu",
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::{get_general_category, GeneralCategory};