feat: #rgba support (#120)

* feat: adds utils.rgb_to_hex function

* feat: adds support for #RGBA highlighting

* doc: generates ldoc

* chore: adds RGBA to expect.lua config

* ref: refactors names parser

* test: removes fail cases for #RGBA

README.md

@@ -129,6 +129,7 @@ library to do custom highlighting themselves.
       -- Set to false|nil to disable
       names_custom = false, -- Custom names to be highlighted: table|function|false|nil
       RGB = true, -- #RGB hex codes
+      RGBA = true, -- #RGBA hex codes
       RRGGBB = true, -- #RRGGBB hex codes
       RRGGBBAA = false, -- #RRGGBBAA hex codes
       AARRGGBB = false, -- 0xAARRGGBB hex codes

doc/colorizer.txt

@@ -318,8 +318,7 @@ parse_lines({bufnr}, {lines}, {line_start}, {options})
     Parameters: ~
 	{bufnr} -  number: Buffer number (0 for current)
 	{lines} -  table: Table of lines to parse
-	{line_start} -  number: This is the buffer line number, from where to
-	start highlighting
+	{line_start} -  number: Buffer line number to start highlighting
 	{options} -  table: Passed in `colorizer.setup`, Only uses
 	`user_default_options`
 
@@ -788,7 +787,7 @@ parser({line}, {i}, {opts})                   *colorizer.parser.rgba_hex.parser*
 	{opts} -  table Options containing:
    - `minlen` (number): Minimum length of the color string
    - `maxlen` (number): Maximum length of the color string
-   - `valid_lengths` (table): Set of valid lengths (e.g., `{4, 7, 9}`)
+   - `valid_lengths` (table): Set of valid lengths (e.g., `{3, 4, 6, 8}`)
 
     returns:~
 	number or nil The end index of the parsed hex color within the line, or
@@ -1056,6 +1055,8 @@ Provides utility functions for color handling and file operations.
 LUA API                                                *colorizer.utils-lua-api*
 
 Functions: ~
+    |rgb_to_hex| - Returns HEX format from RGB values
+
     |byte_is_alphanumeric| - Checks if a byte represents an alphanumeric
     character.
 
@@ -1075,14 +1076,24 @@ Functions: ~
     |bufme| - Validates and returns a buffer number.
 
 
+rgb_to_hex({r}, {g}, {b})                           *colorizer.utils.rgb_to_hex*
+    Returns HEX format from RGB values
+
+    Parameters: ~
+	{r} -  number: Red value
+	{g} -  number: Green value
+	{b} -  number: Blue value
+
+
+
 byte_is_alphanumeric({byte})              *colorizer.utils.byte_is_alphanumeric*
     Checks if a byte represents an alphanumeric character.
 
     Parameters: ~
 	{byte} -  number The byte to check.
 
     returns:~
-	boolean `true` if the byte is alphanumeric, otherwise `false`.
+	boolean: `true` if the byte is alphanumeric, otherwise `false`.
 
 
 
@@ -1093,7 +1104,7 @@ byte_is_hex({byte})                                *colorizer.utils.byte_is_hex*
 	{byte} -  number The byte to check.
 
     returns:~
-	boolean `true` if the byte is hexadecimal, otherwise `false`.
+	boolean: `true` if the byte is hexadecimal, otherwise `false`.
 
 
 
@@ -1105,7 +1116,7 @@ byte_is_valid_colorchar({byte})        *colorizer.utils.byte_is_valid_colorchar*
 	{byte} -  number The byte to check.
 
     returns:~
-	boolean `true` if the byte is valid, otherwise `false`.
+	boolean: `true` if the byte is valid, otherwise `false`.
 
 
 
@@ -1139,7 +1150,7 @@ parse_hex({byte})                                    *colorizer.utils.parse_hex*
 	{byte} -  number The byte to parse.
 
     returns:~
-	number The parsed hexadecimal value of the byte.
+	number: The parsed hexadecimal value of the byte.
 
 
 
@@ -1166,7 +1177,7 @@ bufme({bufnr})                                           *colorizer.utils.bufme*
 	{bufnr} -  number|nil: The buffer number to validate.
 
     returns:~
-	number The validated buffer number.
+	number: The validated buffer number.
 
 
 

doc/modules/colorizer.buffer.html

@@ -218,7 +218,7 @@ <h3>Parameters:</h3>
          table: Table of lines to parse
         </li>
         <li><span class="parameter">line_start</span>
-         number: This is the buffer line number, from where to start highlighting
+         number: Buffer line number to start highlighting
         </li>
         <li><span class="parameter">options</span>
          table: Passed in `colorizer.setup`, Only uses `user_default_options`

doc/modules/colorizer.parser.rgba_hex.html

@@ -104,7 +104,7 @@ <h3>Parameters:</h3>
          table Options containing:
    - `minlen` (number): Minimum length of the color string
    - `maxlen` (number): Maximum length of the color string
-   - `valid_lengths` (table): Set of valid lengths (e.g., `{4, 7, 9}`)
+   - `valid_lengths` (table): Set of valid lengths (e.g., `{3, 4, 6, 8}`)
         </li>
     </ul>
 

doc/modules/colorizer.utils.html

@@ -69,6 +69,10 @@ <h1>Module <code>colorizer.utils</code></h1>
 
 <h2><a href="#Functions">Functions</a></h2>
 <table class="function_list">
+	<tr>
+	<td class="name" nowrap><a href="#rgb_to_hex">rgb_to_hex (r, g, b)</a></td>
+	<td class="summary">Returns HEX format from RGB values</td>
+	</tr>
 	<tr>
 	<td class="name" nowrap><a href="#byte_is_alphanumeric">byte_is_alphanumeric (byte)</a></td>
 	<td class="summary">Checks if a byte represents an alphanumeric character.</td>
@@ -110,6 +114,32 @@ <h2><a href="#Functions">Functions</a></h2>
     <h2 class="section-header "><a name="Functions"></a>Functions</h2>
 
     <dl class="function">
+    <dt>
+    <a name = "rgb_to_hex"></a>
+    <strong>rgb_to_hex (r, g, b)</strong>
+    </dt>
+    <dd>
+    Returns HEX format from RGB values
+
+
+    <h3>Parameters:</h3>
+    <ul>
+        <li><span class="parameter">r</span>
+         number: Red value
+        </li>
+        <li><span class="parameter">g</span>
+         number: Green value
+        </li>
+        <li><span class="parameter">b</span>
+         number: Blue value
+        </li>
+    </ul>
+
+
+
+
+
+</dd>
     <dt>
     <a name = "byte_is_alphanumeric"></a>
     <strong>byte_is_alphanumeric (byte)</strong>
@@ -128,7 +158,7 @@ <h3>Parameters:</h3>
     <h3>Returns:</h3>
     <ol>
 
-        boolean `true` if the byte is alphanumeric, otherwise `false`.
+        boolean: `true` if the byte is alphanumeric, otherwise `false`.
     </ol>
 
 
@@ -153,7 +183,7 @@ <h3>Parameters:</h3>
     <h3>Returns:</h3>
     <ol>
 
-        boolean `true` if the byte is hexadecimal, otherwise `false`.
+        boolean: `true` if the byte is hexadecimal, otherwise `false`.
     </ol>
 
 
@@ -178,7 +208,7 @@ <h3>Parameters:</h3>
     <h3>Returns:</h3>
     <ol>
 
-        boolean `true` if the byte is valid, otherwise `false`.
+        boolean: `true` if the byte is valid, otherwise `false`.
     </ol>
 
 
@@ -256,7 +286,7 @@ <h3>Parameters:</h3>
     <h3>Returns:</h3>
     <ol>
 
-        number The parsed hexadecimal value of the byte.
+        number: The parsed hexadecimal value of the byte.
     </ol>
 
 
@@ -313,7 +343,7 @@ <h3>Parameters:</h3>
     <h3>Returns:</h3>
     <ol>
 
-        number The validated buffer number.
+        number: The validated buffer number.
     </ol>
 
 

lua/colorizer/buffer.lua

@@ -167,7 +167,7 @@ end
 -- rgb_hex and range per line
 ---@param bufnr number: Buffer number (0 for current)
 ---@param lines table: Table of lines to parse
----@param line_start number: This is the buffer line number, from where to start highlighting
+---@param line_start number: Buffer line number to start highlighting
 ---@param options table: Passed in `colorizer.setup`, Only uses `user_default_options`
 ---@return table|nil
 function M.parse_lines(bufnr, lines, line_start, options)
@@ -177,18 +177,15 @@ function M.parse_lines(bufnr, lines, line_start, options)
   end
 
   local data = {}
-  for current_linenum, line in ipairs(lines) do
-    current_linenum = current_linenum - 1 + line_start
-    data[current_linenum] = data[current_linenum] or {}
+  for line_nr, line in ipairs(lines) do
+    line_nr = line_nr - 1 + line_start
+    data[line_nr] = data[line_nr] or {}
 
     local i = 1
     while i < #line do
       local length, rgb_hex = loop_parse_fn(line, i, bufnr)
       if length and rgb_hex then
-        table.insert(
-          data[current_linenum],
-          { rgb_hex = rgb_hex, range = { i - 1, i + length - 1 } }
-        )
+        table.insert(data[line_nr], { rgb_hex = rgb_hex, range = { i - 1, i + length - 1 } })
         i = i + length
       else
         i = i + 1

lua/colorizer/config.lua

@@ -7,6 +7,7 @@ local plugin_user_default_options = {
   names = true,
   names_custom = false,
   RGB = true,
+  RGBA = true,
   RRGGBB = true,
   RRGGBBAA = false,
   AARRGGBB = false,
@@ -95,7 +96,8 @@ end
 ---@return table
 function M.apply_alias_options(options)
   local aliases = {
-    ["css"] = { "names", "RGB", "RRGGBB", "RRGGBBAA", "hsl_fn", "rgb_fn" },
+    --  TODO: 2024-12-24 - Should aliases be configurable?
+    ["css"] = { "names", "RGB", "RGBA", "RRGGBB", "RRGGBBAA", "hsl_fn", "rgb_fn" },
     ["css_fn"] = { "hsl_fn", "rgb_fn" },
   }
   local function handle_alias(name, opts)

lua/colorizer/matcher.lua

@@ -83,6 +83,7 @@ function M.make(options)
   local enable_sass = options.sass and options.sass.enable
   local enable_tailwind = options.tailwind
   local enable_RGB = options.RGB
+  local enable_RGBA = options.RGBA
   local enable_RRGGBB = options.RRGGBB
   local enable_RRGGBBAA = options.RRGGBBAA
   local enable_AARRGGBB = options.AARRGGBB
@@ -95,15 +96,16 @@ function M.make(options)
     + (enable_names and 1 or 0)
     + (enable_names_custom and 2 or 0)
     + (enable_RGB and 4 or 0)
-    + (enable_RRGGBB and 8 or 0)
-    + (enable_RRGGBBAA and 16 or 0)
-    + (enable_AARRGGBB and 32 or 0)
-    + (enable_rgb and 64 or 0)
-    + (enable_hsl and 128 or 0)
-    + ((enable_tailwind == true or enable_tailwind == "normal") and 256 or 0)
-    + (enable_tailwind == "lsp" and 512 or 0)
-    + (enable_tailwind == "both" and 1024 or 0)
-    + (enable_sass and 2048 or 0)
+    + (enable_RGBA and 8 or 0)
+    + (enable_RRGGBB and 16 or 0)
+    + (enable_RRGGBBAA and 32 or 0)
+    + (enable_AARRGGBB and 64 or 0)
+    + (enable_rgb and 128 or 0)
+    + (enable_hsl and 256 or 0)
+    + ((enable_tailwind == true or enable_tailwind == "normal") and 512 or 0)
+    + (enable_tailwind == "lsp" and 1024 or 0)
+    + (enable_tailwind == "both" and 2048 or 0)
+    + (enable_sass and 4096 or 0)
 
   if matcher_key == 0 then
     return false
@@ -133,7 +135,8 @@ function M.make(options)
     matchers.sass_name_parser = true
   end
 
-  local valid_lengths = { [3] = enable_RGB, [6] = enable_RRGGBB, [8] = enable_RRGGBBAA }
+  local valid_lengths =
+    { [3] = enable_RGB, [4] = enable_RGBA, [6] = enable_RRGGBB, [8] = enable_RRGGBBAA }
   local minlen, maxlen
   for k, v in pairs(valid_lengths) do
     if v then
@@ -143,10 +146,11 @@ function M.make(options)
   end
 
   if minlen then
-    matchers.rgba_hex_parser = {}
-    matchers.rgba_hex_parser.valid_lengths = valid_lengths
-    matchers.rgba_hex_parser.maxlen = maxlen
-    matchers.rgba_hex_parser.minlen = minlen
+    matchers.rgba_hex_parser = {
+      valid_lengths = valid_lengths,
+      minlen = minlen,
+      maxlen = maxlen,
+    }
   end
 
   --  TODO: 2024-11-05 - Add custom prefixes

lua/colorizer/parser/argb_hex.lua

@@ -71,7 +71,7 @@ function M.parser(line, i)
     return
   end
 
-  local rgb_hex = string.format("%02x%02x%02x", r, g, b)
+  local rgb_hex = utils.rgb_to_hex(r, g, b)
   return length, rgb_hex
 end
 

lua/colorizer/parser/hsl.lua

@@ -8,6 +8,7 @@ local M = {}
 local count = require("colorizer.utils").count
 local floor = math.floor
 local hsl_to_rgb = require("colorizer.color").hsl_to_rgb
+local utils = require("colorizer.utils")
 
 --- Parses `hsl()` and `hsla()` CSS functions and converts them to RGB hexadecimal format.
 -- This function matches `hsl()` or `hsla()` functions within a line of text, extracting and converting the hue, saturation, and luminance
@@ -106,7 +107,8 @@ function M.parser(line, i, opts)
   if not r or not g or not b then
     return
   end
-  local rgb_hex = string.format("%02x%02x%02x", r * a, g * a, b * a)
+
+  local rgb_hex = utils.rgb_to_hex(r, g, b)
   return match_end - 1, rgb_hex
 end
 

lua/colorizer/parser/rgb.lua

@@ -5,7 +5,7 @@
 
 local M = {}
 
-local count = require("colorizer.utils").count
+local utils = require("colorizer.utils")
 
 --- Parses `rgb()` and `rgba()` CSS functions and converts them to RGB hexadecimal format.
 -- This function matches `rgb()` or `rgba()` functions in a line of text, extracting RGB and optional alpha values.
@@ -45,7 +45,7 @@ function M.parser(line, i, opts)
 
   local units = ("%s%s%s"):format(unit1, unit2, unit3)
   if units:match("%%") then
-    if not ((count(units, "%%")) == min_percent) then
+    if not ((utils.count(units, "%%")) == min_percent) then
       return
     end
   end
@@ -54,11 +54,11 @@ function M.parser(line, i, opts)
   local s_seps = ("%s%s"):format(ssep1, ssep2)
   -- Comma separator syntax
   if c_seps:match(",") then
-    if not (count(c_seps, ",") == min_commas) then
+    if not (utils.count(c_seps, ",") == min_commas) then
       return
     end
     -- Space separator syntax with decimal or percentage alpha
-  elseif count(s_seps, "%s") >= min_spaces then
+  elseif utils.count(s_seps, "%s") >= min_spaces then
     if a then
       if not (c_seps == "/") then
         return
@@ -108,7 +108,7 @@ function M.parser(line, i, opts)
   end
 
   -- Convert to hex, applying alpha to each channel
-  local rgb_hex = string.format("%02x%02x%02x", r * a, g * a, b * a)
+  local rgb_hex = utils.rgb_to_hex(r, g, b)
   return match_end - 1, rgb_hex
 end