From 20fd0091ef4d873fb1ce8b2bbb278664514cac7a Mon Sep 17 00:00:00 2001
From: Akianonymus <anonymus.aki@gmail.com>
Date: Thu, 22 Sep 2022 21:23:11 +0530
Subject: Fix: Error when - in hex color | #24

---
 lua/colorizer/color.lua |  5 +++--
 lua/colorizer/utils.lua | 10 +++++++---
 test/expectation.txt    |  1 +
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/lua/colorizer/color.lua b/lua/colorizer/color.lua
index 711c8e4..9cfac2a 100644
--- a/lua/colorizer/color.lua
+++ b/lua/colorizer/color.lua
@@ -11,6 +11,7 @@ local Trie = require "colorizer.trie"
 local utils = require "colorizer.utils"
 local byte_is_alphanumeric = utils.byte_is_alphanumeric
 local byte_is_hex = utils.byte_is_hex
+local byte_is_valid_colorchar = utils.byte_is_valid_colorchar
 local parse_hex = utils.parse_hex
 local percent_or_hex = utils.percent_or_hex
 
@@ -256,7 +257,7 @@ function color.name_parser(line, i, opts)
     return
   end
 
-  if i > 1 and byte_is_alphanumeric(line:byte(i - 1)) then
+  if i > 1 and byte_is_valid_colorchar(line:byte(i - 1)) then
     return
   end
 
@@ -266,7 +267,7 @@ function color.name_parser(line, i, opts)
     -- Take the Blue out of Blueberry
     -- Line end or non-letter.
     local next_byte_index = i + #prefix
-    if #line >= next_byte_index and byte_is_alphanumeric(line:byte(next_byte_index)) then
+    if #line >= next_byte_index and byte_is_valid_colorchar(line:byte(next_byte_index)) then
       return
     end
     return #prefix, COLOR_MAP[prefix]
diff --git a/lua/colorizer/utils.lua b/lua/colorizer/utils.lua
index c83c32d..22fa6eb 100644
--- a/lua/colorizer/utils.lua
+++ b/lua/colorizer/utils.lua
@@ -28,7 +28,6 @@ do
   -- do not run the loop multiple times
   local b = string.byte
   local byte_values = { ["0"] = b "0", ["9"] = b "9", ["a"] = b "a", ["f"] = b "f", ["z"] = b "z" }
-  local extra_char = { [b "-"] = true }
 
   for i = 0, 255 do
     local v = 0
@@ -45,8 +44,6 @@ do
         v = bor(v, lshift(1, 2))
         v = bor(v, lshift(lowercase - byte_values["a"] + 10, 4))
       end
-    elseif extra_char[i] then
-      v = i
     end
     BYTE_CATEGORY[i] = v
   end
@@ -67,6 +64,13 @@ function utils.byte_is_hex(byte)
   return band(BYTE_CATEGORY[byte], CATEGORY_HEX) ~= 0
 end
 
+---Obvious.
+---@param byte number
+---@return boolean
+function utils.byte_is_valid_colorchar(byte)
+  return utils.byte_is_alphanumeric(byte) or byte == ("-"):byte()
+end
+
 --- Get last modified time of a file
 ---@param path string: file path
 ---@return number|nil: modified time
diff --git a/test/expectation.txt b/test/expectation.txt
index 7ae3484..d04bf92 100644
--- a/test/expectation.txt
+++ b/test/expectation.txt
@@ -26,6 +26,7 @@ hsla(360,50%,50%,1.0000000000000001)
 ]]
 
 --[[ FAIL
+#---
 #F0FF
 #F0FFF
 #F0FFF0F
-- 
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