cesium/Tools/rollup-plugin-strip-pragma/index.js

"use strict";

const MagicString = require("magic-string");
const { createFilter } = require("rollup-pluginutils");

function escapeCharacters(token) {
  return token.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
}

function constructRegex(pragma) {
  const prefix = "include";
  pragma = escapeCharacters(pragma);

  const s =
    "[\\t ]*\\/\\/>>\\s?" +
    prefix +
    "Start\\s?\\(\\s?([\"'])" +
    pragma +
    "\\1\\s?,\\s?pragmas\\." +
    pragma +
    "\\s?\\)\\s?;?" +
    // multiline code block
    "[\\s\\S]*?" +
    // end comment
    "[\\t ]*\\/\\/>>\\s?" +
    prefix +
    "End\\s?\\(\\s?([\"'])" +
    pragma +
    "\\2\\s?\\)\\s?;?\\s?[\\t]*\\n?";

  return new RegExp(s, "gm");
}

function stripPragma(options = {}) {
  const filter = createFilter(options.include, options.exclude);
  const patterns = options.pragmas.map((pragma) => constructRegex(pragma));

  return {
    name: "replace",

    // code: The contents of the file
    // id: the file path
    transform(code, id) {
      // Filters out includes and excluded files
      if (!filter(id)) {
        return null;
      }

      const magicString = new MagicString(code);

      let match;
      let start;
      let end;

      for (let i = 0; i < patterns.length; i++) {
        const pattern = patterns[i];
        while ((match = pattern.exec(code))) {
          start = match.index;
          end = start + match[0].length;
          magicString.overwrite(start, end, "");
        }
      }

      const result = { code: magicString.toString() };
      return result;
    },
  };
}

module.exports = stripPragma;