tailwind-ctp-intellisense/packages/tailwindcss-language-service/src/documentColorProvider.ts

import { State } from './util/state'
import {
  findClassListsInDocument,
  getClassNamesInClassList,
  findHelperFunctionsInDocument,
} from './util/find'
import { getClassNameParts } from './util/getClassNameAtPosition'
import { getColor, getColorFromValue } from './util/color'
import { stringToPath } from './util/stringToPath'
import type { TextDocument } from 'vscode-languageserver'
const dlv = require('dlv')

export async function getDocumentColors(state: State, document: TextDocument) {
  let colors = []
  if (!state.enabled) return colors

  let classLists = await findClassListsInDocument(state, document)
  classLists.forEach((classList) => {
    let classNames = getClassNamesInClassList(classList)
    classNames.forEach((className) => {
      let parts = getClassNameParts(state, className.className)
      if (!parts) return
      let color = getColor(state, parts)
      if (color === null || typeof color === 'string' || color.a === 0) {
        return
      }
      colors.push({ range: className.range, color: color.toRgbString() })
    })
  })

  let helperFns = findHelperFunctionsInDocument(state, document)
  helperFns.forEach((fn) => {
    let keys = stringToPath(fn.value)
    let base = fn.helper === 'theme' ? ['theme'] : []
    let value = dlv(state.config, [...base, ...keys])
    let color = getColorFromValue(value)
    if (color) {
      colors.push({ range: fn.valueRange, color })
    }
  })

  return colors
}