Spec case updates (#17)

* [create-pull-request] automated change

* run main on all pushes

* revert

* fix specs

* bump version

* commit `Gemfile.lock`

* remove debug lines

---------

Co-authored-by: broothie <broothie@users.noreply.github.com>
Co-authored-by: broothie <adbooth8@gmail.com>

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    typeid (0.2.1)
+    typeid (0.2.2)
       uuid7 (~> 0.2.0)
 
 GEM

lib/typeid.rb

@@ -32,11 +32,11 @@ class Error < StandardError; end
   # @param string [String] string representation of a +TypeID+
   # @return [TypeID]
   def self.from_string(string)
-    case string.split("_")
-    in [suffix]
+    case string.rpartition("_")
+    in ["", "", suffix]
       from("", suffix)
 
-    in [prefix, suffix]
+    in [prefix, "_", suffix]
       raise Error, "prefix cannot be empty when there's a separator" if prefix.empty?
 
       from(prefix, suffix)
@@ -83,7 +83,8 @@ def initialize(
     suffix: TypeID::UUID.generate(timestamp: timestamp).base32
   )
     raise Error, "prefix length cannot be greater than #{MAX_PREFIX_LENGTH}" if prefix.length > MAX_PREFIX_LENGTH
-    raise Error, "prefix must be lowercase ASCII characters" unless prefix.match?(/^[a-z]*$/)
+    raise Error, "prefix must be lowercase ASCII characters" unless prefix.match?(/^[a-z_]*$/)
+    raise Error, "prefix cannot start or end with an underscore" if prefix.start_with?("_") || prefix.end_with?("_")
     raise Error, "suffix must be #{TypeID::UUID::Base32::ENCODED_STRING_LENGTH} characters" unless suffix.length == TypeID::UUID::Base32::ENCODED_STRING_LENGTH
     raise Error, "suffix must only contain the letters in '#{TypeID::UUID::Base32::ALPHABET}'" unless suffix.chars.all? { |char| TypeID::UUID::Base32::ALPHABET.include?(char) }
     raise Error, "suffix must start with a 0-7 digit to avoid overflows" unless ("0".."7").cover?(suffix.chars.first)

lib/typeid/version.rb

@@ -1,3 +1,3 @@
 class TypeID < String
-  VERSION = "0.2.1".freeze
+  VERSION = "0.2.2".freeze
 end

spec/invalid.yml

@@ -4,7 +4,7 @@
 # Each example contains an invalid TypeID string. Implementations are expected
 # to throw an error when attempting to parse/validate these strings.
 #
-# Last updated: 2023-07-05
+# Last updated: 2024-04-10 (for version 0.3.0 of the spec)
 
 - name: prefix-uppercase
   typeid: "PREFIX_00000000000000000000000000"
@@ -18,9 +18,10 @@
   typeid: "pre.fix_00000000000000000000000000"
   description: "The prefix can't have symbols, it needs to be alphabetic"
 
-- name: prefix-underscore
-  typeid: "pre_fix_00000000000000000000000000"
-  description: "The prefix can't have symbols, it needs to be alphabetic"
+# Test removed in v0.3.0 – we now allow underscores in the prefix
+# - name: prefix-underscore
+#   typeid: "pre_fix_00000000000000000000000000"
+#   description: "The prefix can't have symbols, it needs to be alphabetic"
 
 - name: prefix-non-ascii
   typeid: "préfix_00000000000000000000000000"
@@ -86,3 +87,13 @@
   # This is the first suffix that overflows into 129 bits
   typeid: "prefix_8zzzzzzzzzzzzzzzzzzzzzzzzz"
   description: "The suffix should encode at most 128-bits"
+
+# Tests below were added in v0.3.0 when we started allowing '_' within the
+# type prefix.
+- name: prefix-underscore-start
+  typeid: "_prefix_00000000000000000000000000"
+  description: "The prefix can't start with an underscore"
+
+- name: prefix-underscore-end
+  typeid: "prefix__00000000000000000000000000"
+  description: "The prefix can't end with an underscore"

spec/valid.yml

@@ -23,7 +23,7 @@
 # note that not all of them are UUIDv7s. When *generating* new random typeids,
 # implementations should always use UUIDv7s.
 #
-# Last updated: 2023-07-05
+# Last updated: 2024-04-10 (for version 0.3.0 of the spec)
 
 - name: nil
   typeid: "00000000000000000000000000"
@@ -64,3 +64,10 @@
   typeid: "prefix_01h455vb4pex5vsknk084sn02q"
   prefix: "prefix"
   uuid: "01890a5d-ac96-774b-bcce-b302099a8057"
+
+# Tests below were added in v0.3.0 when we started allowing '_' within the
+# type prefix.
+- name: prefix-underscore
+  typeid: "pre_fix_00000000000000000000000000"
+  prefix: "pre_fix"
+  uuid: "00000000-0000-0000-0000-000000000000"