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name : processor.js
 'use strict'

let Document = require('./document')
let LazyResult = require('./lazy-result')
let NoWorkResult = require('./no-work-result')
let Root = require('./root')

class Processor {
  constructor(plugins = []) {
    this.version = '8.5.3'
    this.plugins = this.normalize(plugins)
  }

  normalize(plugins) {
    let normalized = []
    for (let i of plugins) {
      if (i.postcss === true) {
        i = i()
      } else if (i.postcss) {
        i = i.postcss
      }

      if (typeof i === 'object' && Array.isArray(i.plugins)) {
        normalized = normalized.concat(i.plugins)
      } else if (typeof i === 'object' && i.postcssPlugin) {
        normalized.push(i)
      } else if (typeof i === 'function') {
        normalized.push(i)
      } else if (typeof i === 'object' && (i.parse || i.stringify)) {
        if (process.env.NODE_ENV !== 'production') {
          throw new Error(
            'PostCSS syntaxes cannot be used as plugins. Instead, please use ' +
              'one of the syntax/parser/stringifier options as outlined ' +
              'in your PostCSS runner documentation.'
          )
        }
      } else {
        throw new Error(i + ' is not a PostCSS plugin')
      }
    }
    return normalized
  }

  process(css, opts = {}) {
    if (
      !this.plugins.length &&
      !opts.parser &&
      !opts.stringifier &&
      !opts.syntax
    ) {
      return new NoWorkResult(this, css, opts)
    } else {
      return new LazyResult(this, css, opts)
    }
  }

  use(plugin) {
    this.plugins = this.plugins.concat(this.normalize([plugin]))
    return this
  }
}

module.exports = Processor
Processor.default = Processor

Root.registerProcessor(Processor)
Document.registerProcessor(Processor)
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