refractor/lang/docker.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

// @ts-nocheck
/**
 * @import {Refractor} from '../lib/core.js'
 */
docker.displayName = 'docker'
docker.aliases = ['dockerfile']

/** @param {Refractor} Prism */
export default function docker(Prism) {
  ;(function (Prism) {
    // Many of the following regexes will contain negated lookaheads like `[ \t]+(?![ \t])`. This is a trick to ensure
    // that quantifiers behave *atomically*. Atomic quantifiers are necessary to prevent exponential backtracking.

    var spaceAfterBackSlash =
      /\\[\r\n](?:\s|\\[\r\n]|#.*(?!.))*(?![\s#]|\\[\r\n])/.source
    // At least one space, comment, or line break
    var space = /(?:[ \t]+(?![ \t])(?:<SP_BS>)?|<SP_BS>)/.source.replace(
      /<SP_BS>/g,
      function () {
        return spaceAfterBackSlash
      }
    )
    var string =
      /"(?:[^"\\\r\n]|\\(?:\r\n|[\s\S]))*"|'(?:[^'\\\r\n]|\\(?:\r\n|[\s\S]))*'/
        .source
    var option = /--[\w-]+=(?:<STR>|(?!["'])(?:[^\s\\]|\\.)+)/.source.replace(
      /<STR>/g,
      function () {
        return string
      }
    )
    var stringRule = {
      pattern: RegExp(string),
      greedy: true
    }
    var commentRule = {
      pattern: /(^[ \t]*)#.*/m,
      lookbehind: true,
      greedy: true
    }

    /**
     * @param {string} source
     * @param {string} flags
     * @returns {RegExp}
     */
    function re(source, flags) {
      source = source
        .replace(/<OPT>/g, function () {
          return option
        })
        .replace(/<SP>/g, function () {
          return space
        })
      return RegExp(source, flags)
    }
    Prism.languages.docker = {
      instruction: {
        pattern:
          /(^[ \t]*)(?:ADD|ARG|CMD|COPY|ENTRYPOINT|ENV|EXPOSE|FROM|HEALTHCHECK|LABEL|MAINTAINER|ONBUILD|RUN|SHELL|STOPSIGNAL|USER|VOLUME|WORKDIR)(?=\s)(?:\\.|[^\r\n\\])*(?:\\$(?:\s|#.*$)*(?![\s#])(?:\\.|[^\r\n\\])*)*/im,
        lookbehind: true,
        greedy: true,
        inside: {
          options: {
            pattern: re(
              /(^(?:ONBUILD<SP>)?\w+<SP>)<OPT>(?:<SP><OPT>)*/.source,
              'i'
            ),
            lookbehind: true,
            greedy: true,
            inside: {
              property: {
                pattern: /(^|\s)--[\w-]+/,
                lookbehind: true
              },
              string: [
                stringRule,
                {
                  pattern: /(=)(?!["'])(?:[^\s\\]|\\.)+/,
                  lookbehind: true
                }
              ],
              operator: /\\$/m,
              punctuation: /=/
            }
          },
          keyword: [
            {
              // https://docs.docker.com/engine/reference/builder/#healthcheck
              pattern: re(
                /(^(?:ONBUILD<SP>)?HEALTHCHECK<SP>(?:<OPT><SP>)*)(?:CMD|NONE)\b/
                  .source,
                'i'
              ),
              lookbehind: true,
              greedy: true
            },
            {
              // https://docs.docker.com/engine/reference/builder/#from
              pattern: re(
                /(^(?:ONBUILD<SP>)?FROM<SP>(?:<OPT><SP>)*(?!--)[^ \t\\]+<SP>)AS/
                  .source,
                'i'
              ),
              lookbehind: true,
              greedy: true
            },
            {
              // https://docs.docker.com/engine/reference/builder/#onbuild
              pattern: re(/(^ONBUILD<SP>)\w+/.source, 'i'),
              lookbehind: true,
              greedy: true
            },
            {
              pattern: /^\w+/,
              greedy: true
            }
          ],
          comment: commentRule,
          string: stringRule,
          variable: /\$(?:\w+|\{[^{}"'\\]*\})/,
          operator: /\\$/m
        }
      },
      comment: commentRule
    }
    Prism.languages.dockerfile = Prism.languages.docker
  })(Prism)
}