askirmas / postcss-d-ts

import type { CollectingArg, InternalOptions } from "./$defs.types"

import type { Options } from "./options.types"

export = collector

function collector(

  identifiers: Record<string, true>,

  {

    identifierParser,

    identifierMatchIndex,

    identifierCleanupParser,

    identifierCleanupReplace,

    allowedAtRuleNames,

  }: Pick<Required<Options>, "identifierMatchIndex"|"identifierCleanupReplace">

  & Pick<InternalOptions, "identifierParser"|"identifierCleanupParser"|"allowedAtRuleNames">

) {

  return ({selectors, parent}: CollectingArg) => {

    if (parent?.type === "atrule") {

      const {name} = parent

      if (name && !allowedAtRuleNames.has(name))

        return

    }

    //TODO consider postcss-selector-parser

    const {length} = selectors

    for (let i = length; i--; ) {

      const selector = selectors[i]

      let parsed: RegExpExecArray | null

      let lastIndex: number|undefined = undefined

      while (parsed = identifierParser.exec(selector)) {

        const {index} = parsed

        if (index === lastIndex)

          // TODO consider throw error

          return

        lastIndex = index

        const identifier = parsed[identifierMatchIndex]

        .replace(identifierCleanupParser, identifierCleanupReplace)

        identifiers[identifier] = true

      }

    }

  }

}