refactored most of the CSS stuff into separate file, refactored color

functions and added shadow functions, replaced JS functions in button
with PISS functions

src/services/theme_data/theme3_slot_functions.js

@@ -0,0 +1,92 @@
+import { convert, brightness } from 'chromatism'
+import { alphaBlend, relativeLuminance } from '../color_convert/color_convert.js'
+
+export const process = (text, functions, findColor, 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, 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 }
+    }
+  },
+  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, dynamicVars, staticVars) => {
+      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
+    }
+  }
+}