# All files tokenize.js

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     const SINGLE_QUOTE = "'".charCodeAt(0)
    const DOUBLE_QUOTE = '"'.charCodeAt(0)
    const BACKSLASH = '\\'.charCodeAt(0)
    const SLASH = '/'.charCodeAt(0)
    const NEWLINE = '\n'.charCodeAt(0)
    const SPACE = ' '.charCodeAt(0)
    const FEED = '\f'.charCodeAt(0)
    const TAB = '\t'.charCodeAt(0)
    const CR = '\r'.charCodeAt(0)
    const OPEN_PARENTHESES = '('.charCodeAt(0)
    const CLOSE_PARENTHESES = ')'.charCodeAt(0)
    const OPEN_CURLY = '{'.charCodeAt(0)
    const CLOSE_CURLY = '}'.charCodeAt(0)
    const SEMICOLON = ';'.charCodeAt(0)
    const ASTERICK = '*'.charCodeAt(0)
    const COLON = ':'.charCodeAt(0)
    const AT = '@'.charCodeAt(0)
    const COMMA = ','.charCodeAt(0)

    const RE_AT_END = /[\t\n\f\r "'()/;\\{]/g
    const RE_NEW_LINE = /[\n\f\r]/g
    const RE_WORD_END = /[\t\n\f\r !"'(),:;@\\{}]|\/(?=\*)/g
    const RE_BAD_BRACKET = /.[\n"'(/\\]/

    module.exports = function tokenize(input) {
      let tokens = []
      let css = input.css.valueOf()

      let code,
        next,
        quote,
        lines,
        last,
        content,
        escape,
        nextLine,
        nextOffset,
        escaped,
        escapePos,
        prev,
        n

      let length = css.length
      let offset = -1
      let line = 1
      let pos = 0

      function unclosed(what) {
        throw input.error('Unclosed ' + what, line, pos - offset)
      }

      while (pos < length) {
        code = css.charCodeAt(pos)

        if (
          code === NEWLINE ||
          code === FEED ||
          (code === CR && css.charCodeAt(pos + 1) !== NEWLINE)
        ) {
          offset = pos
          line += 1
        }

        switch (code) {
          case CR:
            if (css.charCodeAt(pos + 1) === NEWLINE) {
              offset = pos
              line += 1
              pos += 1
              tokens.push(['newline', '\r\n', line - 1])
            } else {
              tokens.push(['newline', '\r', line - 1])
            }
            break

          case FEED:
          case NEWLINE:
            tokens.push(['newline', css.slice(pos, pos + 1), line - 1])
            break

          case SPACE:
          case TAB:
            next = pos
            do {
              next += 1
              code = css.charCodeAt(next)
            } while (code === SPACE || code === TAB)

            tokens.push(['space', css.slice(pos, next)])
            pos = next - 1
            break

          case OPEN_CURLY:
            tokens.push(['{', '{', line, pos - offset])
            break

          case CLOSE_CURLY:
            tokens.push(['}', '}', line, pos - offset])
            break

          case COLON:
            tokens.push([':', ':', line, pos - offset])
            break

          case SEMICOLON:
            tokens.push([';', ';', line, pos - offset])
            break

          case COMMA:
            tokens.push([',', ',', line, pos - offset])
            break

          case OPEN_PARENTHESES:
            prev = tokens.length ? tokens[tokens.length - 1][1] : ''
            n = css.charCodeAt(pos + 1)
            Iif (
              prev === 'url' &&
              n !== SINGLE_QUOTE &&
              n !== DOUBLE_QUOTE &&
              n !== SPACE &&
              n !== NEWLINE &&
              n !== TAB &&
              n !== FEED &&
              n !== CR
            ) {
              next = pos
              do {
                escaped = false
                next = css.indexOf(')', next + 1)
                if (next === -1) unclosed('bracket')
                escapePos = next
                while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
                  escapePos -= 1
                  escaped = !escaped
                }
              } while (escaped)

              tokens.push([
                'brackets',
                css.slice(pos, next + 1),
                line,
                pos - offset,
                line,
                next - offset
              ])
              pos = next
            } else {
              next = css.indexOf(')', pos + 1)
              content = css.slice(pos, next + 1)

              if (next === -1 || RE_BAD_BRACKET.test(content)) {
                tokens.push(['(', '(', line, pos - offset])
              } else {
                tokens.push([
                  'brackets',
                  content,
                  line,
                  pos - offset,
                  line,
                  next - offset
                ])
                pos = next
              }
            }

            break

          case CLOSE_PARENTHESES:
            tokens.push([')', ')', line, pos - offset])
            break

          case SINGLE_QUOTE:
          case DOUBLE_QUOTE:
            quote = code === SINGLE_QUOTE ? "'" : '"'
            next = pos
            do {
              escaped = false
              next = css.indexOf(quote, next + 1)
              Iif (next === -1) unclosed('quote')
              escapePos = next
              while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
                escapePos -= 1
                escaped = !escaped
              }
            } while (escaped)

            content = css.slice(pos, next + 1)
            lines = content.split('\n')
            last = lines.length - 1

            Iif (last > 0) {
              nextLine = line + last
              nextOffset = next - lines[last].length
            } else {
              nextLine = line
              nextOffset = offset
            }

            tokens.push([
              'string',
              css.slice(pos, next + 1),
              line,
              pos - offset,
              nextLine,
              next - nextOffset
            ])

            offset = nextOffset
            line = nextLine
            pos = next
            break

          case AT:
            RE_AT_END.lastIndex = pos + 1
            RE_AT_END.test(css)
            if (RE_AT_END.lastIndex === 0) {
              next = css.length - 1
            } else {
              next = RE_AT_END.lastIndex - 2
            }
            tokens.push([
              'at-word',
              css.slice(pos, next + 1),
              line,
              pos - offset,
              line,
              next - offset
            ])
            pos = next
            break

          case BACKSLASH:
            next = pos
            escape = true

            nextLine = line

            while (css.charCodeAt(next + 1) === BACKSLASH) {
              next += 1
              escape = !escape
            }
            code = css.charCodeAt(next + 1)
            if (escape) {
              if (code === CR && css.charCodeAt(next + 2) === NEWLINE) {
                next += 2
                nextLine += 1
                nextOffset = next
              } else if (code === CR || code === NEWLINE || code === FEED) {
                next += 1
                nextLine += 1
                nextOffset = next
              } else {
                next += 1
              }
            }
            tokens.push([
              'word',
              css.slice(pos, next + 1),
              line,
              pos - offset,
              line,
              next - offset
            ])
            if (nextLine !== line) {
              line = nextLine
              offset = nextOffset
            }
            pos = next
            break

          default:
            n = css.charCodeAt(pos + 1)

            if (code === SLASH && n === ASTERICK) {
              next = css.indexOf('*/', pos + 2) + 1
              Iif (next === 0) unclosed('comment')

              content = css.slice(pos, next + 1)
              lines = content.split('\n')
              last = lines.length - 1

              if (last > 0) {
                nextLine = line + last
                nextOffset = next - lines[last].length
              } else {
                nextLine = line
                nextOffset = offset
              }

              tokens.push([
                'comment',
                content,
                line,
                pos - offset,
                nextLine,
                next - nextOffset
              ])

              offset = nextOffset
              line = nextLine
              pos = next
            } else if (code === SLASH && n === SLASH) {
              RE_NEW_LINE.lastIndex = pos + 1
              RE_NEW_LINE.test(css)
              if (RE_NEW_LINE.lastIndex === 0) {
                next = css.length - 1
              } else {
                next = RE_NEW_LINE.lastIndex - 2
              }

              content = css.slice(pos, next + 1)

              tokens.push([
                'comment',
                content,
                line,
                pos - offset,
                line,
                next - offset,
                'inline'
              ])

              pos = next
            } else {
              RE_WORD_END.lastIndex = pos + 1
              RE_WORD_END.test(css)
              if (RE_WORD_END.lastIndex === 0) {
                next = css.length - 1
              } else {
                next = RE_WORD_END.lastIndex - 2
              }

              tokens.push([
                'word',
                css.slice(pos, next + 1),
                line,
                pos - offset,
                line,
                next - offset
              ])
              pos = next
            }

            break
        }

        pos++
      }

      return tokens
    }