Bazel Maven Repository Naming Algorithm

bazel-maven-repo-name.js

/**
 * @fileoverview Bazel external repository naming algorithm for Maven.
 */

var CLEANSE_CHARS_ = new RegExp('[^_0-9A-Za-z]', 'g');

/**
 * Turns Maven group and artifact into Bazel repository name.
 *
 * <p>This algorithm works by turning illegal characters into underscores and
 * then eliminating redundancy. For example:
 *
 * <ul>
 * <li>com.google.guava:guava becomes com_google_guava
 * <li>commons-logging:commons-logging becomes commons_logging
 * <li>junit:junit becomes junit
 * </ul>
 *
 * @param {string} group Maven group ID.
 * @param {string} artifact Maven artifact ID.
 * @return {string} Recommended name for Bazel external repository.
 */
function getName(group, artifact) {
  var left = group.replace(CLEANSE_CHARS_, '_');
  var right = artifact.replace(CLEANSE_CHARS_, '_');
  var p = -1;
  while (p < right.length) {
    p = right.indexOf('_', p + 1);
    if (p == -1) {
      p = right.length;
    }
    var chunk = right.slice(0, p);
    if (left == chunk) {
      return right;
    }
    chunk = '_' + chunk;
    if (left.slice(-chunk.length) == chunk) {
      left = left.slice(0, -chunk.length);
      break;
    }
  }
  return left + '_' + right;
}