config.js

/**
 * config.js - The configuration for the loader
 */

var configData = config.data = {
  // The root path to use for id2uri parsing
  base: (function() {
    var ret = dirname(loaderUri)

    // If loaderUri is `http://test.com/libs/seajs/1.0.0/sea.js`, the baseUri
    // should be `http://test.com/libs/`
    var m = ret.match(/^(.+\/)seajs\/\d[^/]+\/$/)
    if (m) {
      ret = m[1]
    }

    return ret
  })(),

  // The charset for requesting files
  charset: "utf-8"

  // debug: false - Debug mode
  // alias - The shorthand alias for module id
  // vars - The {xxx} variables in module id
  // map - An array containing rules to map module uri
  // preload - Modules that are needed to load before all other modules
}

function config(data) {
  for (var key in data) {
    if (hasOwn(data, key)) {

      var prev = configData[key]
      var curr = data[key]

      // For alias, vars
      if (prev && /alias|vars/.test(key)) {
        for (var k in curr) {
          if (hasOwn(curr, k)) {

            var val = curr[k]
            if (k in prev) {
              checkConfigConflict(prev[k], val, k, key)
            }

            prev[k] = val
          }
        }
      }
      else {
        // For map, preload
        if (isArray(prev)) {
          curr = prev.concat(curr)
        }

        // Set config
        configData[key] = curr

        // Make sure that `configData.base` is an absolute path
        if (key === 'base') {
          makeBaseAbsolute()
        }
      }

    }
  }

  return seajs
}

seajs.config = config


function checkConfigConflict(prev, curr, k, key) {
  if (prev !== curr) {
    log("The config of " + key + '["' + k + '"] is changed from "' +
        prev + '" to "' + curr + '"', "warn")
  }
}

function makeBaseAbsolute() {
  var base = configData.base
  if (!isAbsolute(base)) {
    configData.base = id2Uri((isRoot(base) ? "" : "./") + base
        + (base.charAt(base.length - 1) === "/" ? "" : "/"))
  }
}