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|
---Helper functions to parse different colour formats
--@module colorizer.color
local api = vim.api
local bit = require "bit"
local floor, min, max = math.floor, math.min, math.max
local band, rshift, lshift, tohex = bit.band, bit.rshift, bit.lshift, bit.tohex
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 count = utils.count
local parse_hex = utils.parse_hex
local color = {}
local ARGB_MINIMUM_LENGTH = #"0xAARRGGBB" - 1
---parse for 0xaarrggbb and return rgb hex.
-- a format used in android apps
---@param line string: line to parse
---@param i number: index of line from where to start parsing
---@return number|nil: index of line where the hex value ended
---@return string|nil: rgb hex value
function color.argb_hex_parser(line, i)
if #line < i + ARGB_MINIMUM_LENGTH then
return
end
local j = i + 2
local n = j + 8
local alpha
local v = 0
while j <= min(n, #line) do
local b = line:byte(j)
if not byte_is_hex(b) then
break
end
if j - i <= 3 then
alpha = parse_hex(b) + lshift(alpha or 0, 4)
else
v = parse_hex(b) + lshift(v, 4)
end
j = j + 1
end
if #line >= j and byte_is_alphanumeric(line:byte(j)) then
return
end
local length = j - i
if length ~= 10 then
return
end
alpha = tonumber(alpha) / 255
local r = floor(band(rshift(v, 16), 0xFF) * alpha)
local g = floor(band(rshift(v, 8), 0xFF) * alpha)
local b = floor(band(v, 0xFF) * alpha)
local rgb_hex = string.format("%02x%02x%02x", r, g, b)
return length, rgb_hex
end
--- Converts an HSL color value to RGB.
---@param h number: Hue
---@param s number: Saturation
---@param l number: Lightness
---@return number|nil,number|nil,number|nil
function color.hsl_to_rgb(h, s, l)
if h > 1 or s > 1 or l > 1 then
return
end
if s == 0 then
local r = l * 255
return r, r, r
end
local q
if l < 0.5 then
q = l * (1 + s)
else
q = l + s - l * s
end
local p = 2 * l - q
return 255 * color.hue_to_rgb(p, q, h + 1 / 3),
255 * color.hue_to_rgb(p, q, h),
255 * color.hue_to_rgb(p, q, h - 1 / 3)
end
local CSS_HSLA_FN_MINIMUM_LENGTH = #"hsla(0,0%,0%)" - 1
local CSS_HSL_FN_MINIMUM_LENGTH = #"hsl(0,0%,0%)" - 1
---Parse for hsl() hsla() css function and return rgb hex.
-- For more info: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hsl
---@param line string: Line to parse
---@param i number: Index of line from where to start parsing
---@param opts table: Values passed from matchers like prefix
---@return number|nil: Index of line where the hsla/hsl function ended
---@return string|nil: rgb hex value
function color.hsl_function_parser(line, i, opts)
local min_len = CSS_HSLA_FN_MINIMUM_LENGTH
local min_commas, min_spaces = 2, 2
local pattern = "^"
.. opts.prefix
.. "%(%s*([.%d]+)([deg]*)([turn]*)(%s?)%s*(,?)%s*(%d+)%%(%s?)%s*(,?)%s*(%d+)%%%s*(/?,?)%s*([.%d]*)([%%]?)%s*%)()"
if opts.prefix == "hsl" then
min_len = CSS_HSL_FN_MINIMUM_LENGTH
end
if #line < i + min_len then
return
end
local h, deg, turn, ssep1, csep1, s, ssep2, csep2, l, sep3, a, percent_sign, match_end = line:sub(i):match(pattern)
if not match_end then
return
end
if a == "" then
a = nil
else
min_commas = min_commas + 1
end
-- the text after hue should be either deg or empty
if not ((deg == "") or (deg == "deg") or (turn == "turn")) then
return
end
local c_seps = ("%s%s%s"):format(csep1, csep2, sep3)
local s_seps = ("%s%s"):format(ssep1, ssep2)
-- comma separator syntax
if c_seps:match "," then
if not (count(c_seps, ",") == min_commas) then
return
end
-- space separator syntax with decimal or percentage alpha
elseif count(s_seps, "%s") >= min_spaces then
if a then
if not (c_seps == "/") then
return
end
end
else
return
end
if not a then
a = 1
else
a = tonumber(a)
-- if percentage, then convert to decimal
if percent_sign == "%" then
a = a / 100
end
-- although alpha doesn't support larger values than 1, css anyways renders it at 1
if a > 1 then
a = 1
end
end
h = tonumber(h) or 1
-- single turn is 360
if turn == "turn" then
h = 360 * h
end
-- if hue angle if greater than 360, then calculate the hue within 360
if h > 360 then
local turns = h / 360
h = 360 * (turns - floor(turns))
end
-- if saturation or luminance percentage is greater than 100 then reset it to 100
s = tonumber(s)
if s > 100 then
s = 100
end
l = tonumber(l)
if l > 100 then
l = 100
end
local r, g, b = color.hsl_to_rgb(h / 360, s / 100, l / 100)
if r == nil or g == nil or b == nil then
return
end
local rgb_hex = string.format("%02x%02x%02x", r * a, g * a, b * a)
return match_end - 1, rgb_hex
end
---Convert hsl colour values to rgb.
-- Source: https://gist.github.com/mjackson/5311256
---@param p number
---@param q number
---@param t number
---@return number
function color.hue_to_rgb(p, q, t)
if t < 0 then
t = t + 1
end
if t > 1 then
t = t - 1
end
if t < 1 / 6 then
return p + (q - p) * 6 * t
end
if t < 1 / 2 then
return q
end
if t < 2 / 3 then
return p + (q - p) * (2 / 3 - t) * 6
end
return p
end
---Determine whether to use black or white text.
--
-- ref: https://stackoverflow.com/a/1855903/837964
-- https://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color
---@param r number: Red
---@param g number: Green
---@param b number: Blue
function color.is_bright(r, g, b)
-- counting the perceptive luminance - human eye favors green color
local luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255
if luminance > 0.5 then
return true -- bright colors, black font
else
return false -- dark colors, white font
end
end
local COLOR_MAP
local COLOR_TRIE
local COLOR_NAME_MINLEN, COLOR_NAME_MAXLEN
local COLOR_NAME_SETTINGS = { lowercase = true, strip_digits = false }
local TAILWIND_ENABLED = false
--- Grab all the colour values from `vim.api.nvim_get_color_map` and create a lookup table.
-- COLOR_MAP is used to store the colour values
---@param line string: Line to parse
---@param i number: Index of line from where to start parsing
---@param opts table: Currently contains whether tailwind is enabled or not
function color.name_parser(line, i, opts)
--- Setup the COLOR_MAP and COLOR_TRIE
if not COLOR_TRIE or opts.tailwind ~= TAILWIND_ENABLED then
COLOR_MAP = {}
COLOR_TRIE = Trie()
for k, v in pairs(api.nvim_get_color_map()) do
if not (COLOR_NAME_SETTINGS.strip_digits and k:match "%d+$") then
COLOR_NAME_MINLEN = COLOR_NAME_MINLEN and min(#k, COLOR_NAME_MINLEN) or #k
COLOR_NAME_MAXLEN = COLOR_NAME_MAXLEN and max(#k, COLOR_NAME_MAXLEN) or #k
local rgb_hex = tohex(v, 6)
COLOR_MAP[k] = rgb_hex
COLOR_TRIE:insert(k)
if COLOR_NAME_SETTINGS.lowercase then
local lowercase = k:lower()
COLOR_MAP[lowercase] = rgb_hex
COLOR_TRIE:insert(lowercase)
end
end
end
if opts and opts.tailwind then
if opts.tailwind == true or opts.tailwind == "normal" or opts.tailwind == "both" then
local tailwind = require "colorizer.tailwind_colors"
-- setup tailwind colors
for k, v in pairs(tailwind.colors) do
for _, pre in ipairs(tailwind.prefixes) do
local name = pre .. "-" .. k
COLOR_NAME_MINLEN = COLOR_NAME_MINLEN and min(#name, COLOR_NAME_MINLEN) or #name
COLOR_NAME_MAXLEN = COLOR_NAME_MAXLEN and max(#name, COLOR_NAME_MAXLEN) or #name
COLOR_MAP[name] = v
COLOR_TRIE:insert(name)
end
end
end
end
TAILWIND_ENABLED = opts.tailwind
end
if #line < i + COLOR_NAME_MINLEN - 1 then
return
end
if i > 1 and byte_is_valid_colorchar(line:byte(i - 1)) then
return
end
local prefix = COLOR_TRIE:longest_prefix(line, i)
if prefix then
-- Check if there is a letter here so as to disallow matching here.
-- 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_valid_colorchar(line:byte(next_byte_index)) then
return
end
return #prefix, COLOR_MAP[prefix]
end
end
local CSS_RGBA_FN_MINIMUM_LENGTH = #"rgba(0,0,0)" - 1
local CSS_RGB_FN_MINIMUM_LENGTH = #"rgb(0,0,0)" - 1
---Parse for rgb() rgba() css function and return rgb hex.
-- For more info: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgb
---@param line string: Line to parse
---@param i number: Index of line from where to start parsing
---@param opts table: Values passed from matchers like prefix
---@return number|nil: Index of line where the rgb/rgba function ended
---@return string|nil: rgb hex value
function color.rgb_function_parser(line, i, opts)
local min_len = CSS_RGBA_FN_MINIMUM_LENGTH
local min_commas, min_spaces, min_percent = 2, 2, 3
local pattern = "^"
.. opts.prefix
.. "%(%s*([.%d]+)([%%]?)(%s?)%s*(,?)%s*([.%d]+)([%%]?)(%s?)%s*(,?)%s*([.%d]+)([%%]?)%s*(/?,?)%s*([.%d]*)([%%]?)%s*%)()"
if opts.prefix == "rgb" then
min_len = CSS_RGB_FN_MINIMUM_LENGTH
end
if #line < i + min_len then
return
end
local r, unit1, ssep1, csep1, g, unit2, ssep2, csep2, b, unit3, sep3, a, unit_a, match_end =
line:sub(i):match(pattern)
if not match_end then
return
end
if a == "" then
a = nil
else
min_commas = min_commas + 1
end
local units = ("%s%s%s"):format(unit1, unit2, unit3)
if units:match "%%" then
if not ((count(units, "%%")) == min_percent) then
return
end
end
local c_seps = ("%s%s%s"):format(csep1, csep2, sep3)
local s_seps = ("%s%s"):format(ssep1, ssep2)
-- comma separator syntax
if c_seps:match "," then
if not (count(c_seps, ",") == min_commas) then
return
end
-- space separator syntax with decimal or percentage alpha
elseif count(s_seps, "%s") >= min_spaces then
if a then
if not (c_seps == "/") then
return
end
end
else
return
end
if not a then
a = 1
else
a = tonumber(a)
-- if percentage, then convert to decimal
if unit_a == "%" then
a = a / 100
end
-- although alpha doesn't support larger values than 1, css anyways renders it at 1
if a > 1 then
a = 1
end
end
r = tonumber(r)
if not r then
return
end
g = tonumber(g)
if not g then
return
end
b = tonumber(b)
if not b then
return
end
if unit1 == "%" then
r = r / 100 * 255
g = g / 100 * 255
b = b / 100 * 255
else
-- although r,g,b doesn't support larger values than 255, css anyways renders it at 255
if r > 255 then
r = 255
end
if g > 255 then
g = 255
end
if b > 255 then
b = 255
end
end
local rgb_hex = string.format("%02x%02x%02x", r * a, g * a, b * a)
return match_end - 1, rgb_hex
end
---parse for #rrggbbaa and return rgb hex.
-- a format used in android apps
---@param line string: line to parse
---@param i number: index of line from where to start parsing
---@param opts table: Containing minlen, maxlen, valid_lengths
---@return number|nil: index of line where the hex value ended
---@return string|nil: rgb hex value
function color.rgba_hex_parser(line, i, opts)
local minlen, maxlen, valid_lengths = opts.minlen, opts.maxlen, opts.valid_lengths
local j = i + 1
if #line < j + minlen - 1 then
return
end
if i > 1 and byte_is_alphanumeric(line:byte(i - 1)) then
return
end
local n = j + maxlen
local alpha
local v = 0
while j <= min(n, #line) do
local b = line:byte(j)
if not byte_is_hex(b) then
break
end
if j - i >= 7 then
alpha = parse_hex(b) + lshift(alpha or 0, 4)
else
v = parse_hex(b) + lshift(v, 4)
end
j = j + 1
end
if #line >= j and byte_is_alphanumeric(line:byte(j)) then
return
end
local length = j - i
if length ~= 4 and length ~= 7 and length ~= 9 then
return
end
if alpha then
alpha = tonumber(alpha) / 255
local r = floor(band(rshift(v, 16), 0xFF) * alpha)
local g = floor(band(rshift(v, 8), 0xFF) * alpha)
local b = floor(band(v, 0xFF) * alpha)
local rgb_hex = string.format("%02x%02x%02x", r, g, b)
return 9, rgb_hex
end
return (valid_lengths[length - 1] and length), line:sub(i + 1, i + length - 1)
end
return color
|