Handle RBSKeyword types (#60)

Author: alexcrocha

rust/ruby-rbs/build.rs

@@ -171,6 +171,15 @@ fn generate(config: &Config) -> Result<(), Box<dyn Error>> {
                         )?;
                         writeln!(file, "    }}")?;
                     }
+                    "rbs_keyword" => {
+                        writeln!(file, "    pub fn {}(&self) -> RBSKeyword {{", field.name)?;
+                        writeln!(
+                            file,
+                            "        RBSKeyword::new(self.parser, unsafe {{ (*self.pointer).{} }})",
+                            field.name
+                        )?;
+                        writeln!(file, "    }}")?;
+                    }
                     _ => eprintln!("Unknown field type: {}", field.c_type),
                 }
             }

rust/ruby-rbs/src/lib.rs

@@ -183,6 +183,32 @@ impl RBSSymbol {
     }
 }
 
+pub struct RBSKeyword {
+    parser: *mut rbs_parser_t,
+    pointer: *const rbs_keyword,
+}
+
+impl RBSKeyword {
+    pub fn new(parser: *mut rbs_parser_t, pointer: *const rbs_keyword) -> Self {
+        Self { parser, pointer }
+    }
+
+    pub fn name(&self) -> &[u8] {
+        unsafe {
+            let constant_ptr = rbs_constant_pool_id_to_constant(
+                &(*self.parser).constant_pool,
+                (*self.pointer).constant_id,
+            );
+            if constant_ptr.is_null() {
+                panic!("Constant ID for keyword is not present in the pool");
+            }
+
+            let constant = &*constant_ptr;
+            std::slice::from_raw_parts(constant.start, constant.length)
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;