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import { convert, brightness } from 'chromatism'
import { alphaBlend, getTextColor, relativeLuminance } from '../color_convert/color_convert.js'
export const process = (text, functions, { findColor, findShadow }, { dynamicVars, staticVars }) => {
const { funcName, argsString } = /\$(?<funcName>\w+)\((?<argsString>[#a-zA-Z0-9-,.'"\s]*)\)/.exec(text).groups
const args = argsString.split(/,/g).map(a => a.trim())
const func = functions[funcName]
if (args.length < func.argsNeeded) {
throw new Error(`$${funcName} requires at least ${func.argsNeeded} arguments, but ${args.length} were provided`)
}
return func.exec(args, { findColor, findShadow }, { dynamicVars, staticVars })
}
export const colorFunctions = {
alpha: {
argsNeeded: 2,
exec: (args, { findColor }, { dynamicVars, staticVars }) => {
const [color, amountArg] = args
const colorArg = convert(findColor(color, { dynamicVars, staticVars })).rgb
const amount = Number(amountArg)
return { ...colorArg, a: amount }
}
},
textColor: {
argsNeeded: 2,
exec: (args, { findColor }, { dynamicVars, staticVars }) => {
const [backgroundArg, foregroundArg, preserve = 'preserve'] = args
const background = convert(findColor(backgroundArg, { dynamicVars, staticVars })).rgb
const foreground = convert(findColor(foregroundArg, { dynamicVars, staticVars })).rgb
return getTextColor(background, foreground, preserve === 'preserve')
}
},
blend: {
argsNeeded: 3,
exec: (args, { findColor }, { dynamicVars, staticVars }) => {
const [backgroundArg, amountArg, foregroundArg] = args
const background = convert(findColor(backgroundArg, { dynamicVars, staticVars })).rgb
const foreground = convert(findColor(foregroundArg, { dynamicVars, staticVars })).rgb
const amount = Number(amountArg)
return alphaBlend(background, amount, foreground)
}
},
mod: {
argsNeeded: 2,
exec: (args, { findColor }, { dynamicVars, staticVars }) => {
const [colorArg, amountArg] = args
const color = convert(findColor(colorArg, { dynamicVars, staticVars })).rgb
const amount = Number(amountArg)
const effectiveBackground = dynamicVars.lowerLevelBackground
const isLightOnDark = relativeLuminance(convert(effectiveBackground).rgb) < 0.5
const mod = isLightOnDark ? 1 : -1
return brightness(amount * mod, color).rgb
}
}
}
export const shadowFunctions = {
borderSide: {
argsNeeded: 3,
exec: (args, { findColor }) => {
const [color, side, alpha = '1', widthArg = '1', inset = 'inset'] = args
const width = Number(widthArg)
const isInset = inset === 'inset'
const targetShadow = {
x: 0,
y: 0,
blur: 0,
spread: 0,
color,
alpha: Number(alpha),
inset: isInset
}
side.split('-').forEach((position) => {
switch (position) {
case 'left':
targetShadow.x = width * (inset ? 1 : -1)
break
case 'right':
targetShadow.x = -1 * width * (inset ? 1 : -1)
break
case 'top':
targetShadow.y = width * (inset ? 1 : -1)
break
case 'bottom':
targetShadow.y = -1 * width * (inset ? 1 : -1)
break
}
})
return [targetShadow]
}
}
}
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