@shockpkg/ria-packager/lib/util.js

Package for creating Adobe AIR packages

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.defaultValue = defaultValue;
exports.defaultNull = defaultNull;
exports.defaultFalse = defaultFalse;
exports.defaultTrue = defaultTrue;
exports.trimDotSlash = trimDotSlash;
exports.pathRelativeBase = pathRelativeBase;
exports.pathRelativeBaseMatch = pathRelativeBaseMatch;
exports.bufferToArrayBuffer = bufferToArrayBuffer;

/**
 * Default value if value is undefined.
 *
 * @param value Value.
 * @param defaultValue Default value.
 * @returns Value or the default value if undefined.
 */
function defaultValue(value, defaultValue) {
  // eslint-disable-next-line no-undefined
  return value === undefined ? defaultValue : value;
}
/**
 * Default null if value is undefined.
 *
 * @param value Value.
 * @returns Value or null if undefined.
 */


function defaultNull(value) {
  return defaultValue(value, null);
}
/**
 * Default false if value is undefined.
 *
 * @param value Value.
 * @returns Value or false if undefined.
 */


function defaultFalse(value) {
  return defaultValue(value, false);
}
/**
 * Default true if value is undefined.
 *
 * @param value Value.
 * @returns Value or true if undefined.
 */


function defaultTrue(value) {
  return defaultValue(value, true);
}
/**
 * Trim dot flash from head of path.
 *
 * @param path Path string.
 * @returns Trimmed path.
 */


function trimDotSlash(path) {
  return path.replace(/^(\.\/)+/, '');
}
/**
 * Find path relative from base, if base matches.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns path, or null.
 */


function pathRelativeBase(path, start, nocase = false) {
  const p = trimDotSlash(nocase ? path.toLowerCase() : path);
  const s = trimDotSlash(nocase ? start.toLowerCase() : start);

  if (p === s) {
    return '';
  }

  if (p.startsWith(`${s}/`)) {
    return path.substr(s.length + 1);
  }

  return null;
}
/**
 * Same as pathRelativeBase, but retuns true on a match, else false.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns true on match, else false.
 */


function pathRelativeBaseMatch(path, start, nocase = false) {
  return pathRelativeBase(path, start, nocase) !== null;
}
/**
 * Get ArrayBuffer from Buffer.
 *
 * @param buffer Buffer instance.
 * @returns ArrayBuffer copy.
 */


function bufferToArrayBuffer(buffer) {
  const {
    byteOffset,
    byteLength
  } = buffer;
  return buffer.buffer.slice(byteOffset, byteOffset + byteLength);
}
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