diff resources/osc/node_modules/osc-min/lib/osc-utilities.js @ 271:fb9c28a4676b prerelease

Added osc example project and node script for testing

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resources/osc/node_modules/osc-min/lib/osc-utilities.js	Tue May 17 16:01:06 2016 +0100
@@ -0,0 +1,741 @@
+// Generated by CoffeeScript 1.10.0
+(function() {
+  var IsArray, StrictError, TWO_POW_32, UNIX_EPOCH, binpack, getArrayArg, isOscBundleBuffer, makeTimetag, mapBundleList, oscTypeCodes, padding, toOscTypeAndArgs,
+    hasProp = {}.hasOwnProperty;
+
+  binpack = require("binpack");
+
+  exports.concat = function(buffers) {
+    var buffer, copyTo, destBuffer, j, k, l, len, len1, len2, sumLength;
+    if (!IsArray(buffers)) {
+      throw new Error("concat must take an array of buffers");
+    }
+    for (j = 0, len = buffers.length; j < len; j++) {
+      buffer = buffers[j];
+      if (!Buffer.isBuffer(buffer)) {
+        throw new Error("concat must take an array of buffers");
+      }
+    }
+    sumLength = 0;
+    for (k = 0, len1 = buffers.length; k < len1; k++) {
+      buffer = buffers[k];
+      sumLength += buffer.length;
+    }
+    destBuffer = new Buffer(sumLength);
+    copyTo = 0;
+    for (l = 0, len2 = buffers.length; l < len2; l++) {
+      buffer = buffers[l];
+      buffer.copy(destBuffer, copyTo);
+      copyTo += buffer.length;
+    }
+    return destBuffer;
+  };
+
+  exports.toOscString = function(str, strict) {
+    var i, j, nullIndex, ref;
+    if (!(typeof str === "string")) {
+      throw new Error("can't pack a non-string into an osc-string");
+    }
+    nullIndex = str.indexOf("\u0000");
+    if (nullIndex !== -1 && strict) {
+      throw StrictError("Can't pack an osc-string that contains NULL characters");
+    }
+    if (nullIndex !== -1) {
+      str = str.slice(0, nullIndex);
+    }
+    for (i = j = 0, ref = padding(str); 0 <= ref ? j < ref : j > ref; i = 0 <= ref ? ++j : --j) {
+      str += "\u0000";
+    }
+    return new Buffer(str);
+  };
+
+  exports.splitOscString = function(buffer, strict) {
+    var i, j, nullIndex, rawStr, ref, ref1, rest, splitPoint, str;
+    if (!Buffer.isBuffer(buffer)) {
+      throw StrictError("Can't split something that isn't a buffer");
+    }
+    rawStr = buffer.toString("utf8");
+    nullIndex = rawStr.indexOf("\u0000");
+    if (nullIndex === -1) {
+      if (strict) {
+        throw new Error("All osc-strings must contain a null character");
+      }
+      return {
+        string: rawStr,
+        rest: new Buffer(0)
+      };
+    }
+    str = rawStr.slice(0, nullIndex);
+    splitPoint = Buffer.byteLength(str) + padding(str);
+    if (strict && splitPoint > buffer.length) {
+      throw StrictError("Not enough padding for osc-string");
+    }
+    if (strict) {
+      for (i = j = ref = Buffer.byteLength(str), ref1 = splitPoint; ref <= ref1 ? j < ref1 : j > ref1; i = ref <= ref1 ? ++j : --j) {
+        if (buffer[i] !== 0) {
+          throw StrictError("Not enough or incorrect padding for osc-string");
+        }
+      }
+    }
+    rest = buffer.slice(splitPoint, buffer.length);
+    return {
+      string: str,
+      rest: rest
+    };
+  };
+
+  exports.splitInteger = function(buffer, type) {
+    var bytes, num, rest, value;
+    if (type == null) {
+      type = "Int32";
+    }
+    bytes = (binpack["pack" + type](0)).length;
+    if (buffer.length < bytes) {
+      throw new Error("buffer is not big enough for integer type");
+    }
+    num = 0;
+    value = binpack["unpack" + type](buffer.slice(0, bytes), "big");
+    rest = buffer.slice(bytes, buffer.length);
+    return {
+      integer: value,
+      rest: rest
+    };
+  };
+
+  exports.splitTimetag = function(buffer) {
+    var a, b, bytes, c, d, fractional, rest, seconds, type;
+    type = "Int32";
+    bytes = (binpack["pack" + type](0)).length;
+    if (buffer.length < (bytes * 2)) {
+      throw new Error("buffer is not big enough to contain a timetag");
+    }
+    a = 0;
+    b = bytes;
+    seconds = binpack["unpack" + type](buffer.slice(a, b), "big");
+    c = bytes;
+    d = bytes + bytes;
+    fractional = binpack["unpack" + type](buffer.slice(c, d), "big");
+    rest = buffer.slice(d, buffer.length);
+    return {
+      timetag: [seconds, fractional],
+      rest: rest
+    };
+  };
+
+  UNIX_EPOCH = 2208988800;
+
+  TWO_POW_32 = 4294967296;
+
+  exports.dateToTimetag = function(date) {
+    return exports.timestampToTimetag(date.getTime() / 1000);
+  };
+
+  exports.timestampToTimetag = function(secs) {
+    var fracSeconds, wholeSecs;
+    wholeSecs = Math.floor(secs);
+    fracSeconds = secs - wholeSecs;
+    return makeTimetag(wholeSecs, fracSeconds);
+  };
+
+  exports.timetagToTimestamp = function(timetag) {
+    var seconds;
+    seconds = timetag[0] + exports.ntpToFractionalSeconds(timetag[1]);
+    return seconds - UNIX_EPOCH;
+  };
+
+  makeTimetag = function(unixseconds, fracSeconds) {
+    var ntpFracs, ntpSecs;
+    ntpSecs = unixseconds + UNIX_EPOCH;
+    ntpFracs = Math.round(TWO_POW_32 * fracSeconds);
+    return [ntpSecs, ntpFracs];
+  };
+
+  exports.timetagToDate = function(timetag) {
+    var date, dd, fracs, fractional, seconds;
+    seconds = timetag[0], fractional = timetag[1];
+    seconds = seconds - UNIX_EPOCH;
+    fracs = exports.ntpToFractionalSeconds(fractional);
+    date = new Date();
+    date.setTime((seconds * 1000) + (fracs * 1000));
+    dd = new Date();
+    dd.setUTCFullYear(date.getUTCFullYear());
+    dd.setUTCMonth(date.getUTCMonth());
+    dd.setUTCDate(date.getUTCDate());
+    dd.setUTCHours(date.getUTCHours());
+    dd.setUTCMinutes(date.getUTCMinutes());
+    dd.setUTCSeconds(date.getUTCSeconds());
+    dd.setUTCMilliseconds(fracs * 1000);
+    return dd;
+  };
+
+  exports.deltaTimetag = function(seconds, now) {
+    var n;
+    n = (now != null ? now : new Date()) / 1000;
+    return exports.timestampToTimetag(n + seconds);
+  };
+
+  exports.ntpToFractionalSeconds = function(fracSeconds) {
+    return parseFloat(fracSeconds) / TWO_POW_32;
+  };
+
+  exports.toTimetagBuffer = function(timetag) {
+    var high, low, type;
+    if (typeof timetag === "number") {
+      timetag = exports.timestampToTimetag(timetag);
+    } else if (typeof timetag === "object" && ("getTime" in timetag)) {
+      timetag = exports.dateToTimetag(timetag);
+    } else if (timetag.length !== 2) {
+      throw new Error("Invalid timetag" + timetag);
+    }
+    type = "Int32";
+    high = binpack["pack" + type](timetag[0], "big");
+    low = binpack["pack" + type](timetag[1], "big");
+    return exports.concat([high, low]);
+  };
+
+  exports.toIntegerBuffer = function(number, type) {
+    if (type == null) {
+      type = "Int32";
+    }
+    if (typeof number !== "number") {
+      throw new Error("cannot pack a non-number into an integer buffer");
+    }
+    return binpack["pack" + type](number, "big");
+  };
+
+  oscTypeCodes = {
+    s: {
+      representation: "string",
+      split: function(buffer, strict) {
+        var split;
+        split = exports.splitOscString(buffer, strict);
+        return {
+          value: split.string,
+          rest: split.rest
+        };
+      },
+      toArg: function(value, strict) {
+        if (typeof value !== "string") {
+          throw new Error("expected string");
+        }
+        return exports.toOscString(value, strict);
+      }
+    },
+    i: {
+      representation: "integer",
+      split: function(buffer, strict) {
+        var split;
+        split = exports.splitInteger(buffer);
+        return {
+          value: split.integer,
+          rest: split.rest
+        };
+      },
+      toArg: function(value, strict) {
+        if (typeof value !== "number") {
+          throw new Error("expected number");
+        }
+        return exports.toIntegerBuffer(value);
+      }
+    },
+    t: {
+      representation: "timetag",
+      split: function(buffer, strict) {
+        var split;
+        split = exports.splitTimetag(buffer);
+        return {
+          value: split.timetag,
+          rest: split.rest
+        };
+      },
+      toArg: function(value, strict) {
+        return exports.toTimetagBuffer(value);
+      }
+    },
+    f: {
+      representation: "float",
+      split: function(buffer, strict) {
+        return {
+          value: binpack.unpackFloat32(buffer.slice(0, 4), "big"),
+          rest: buffer.slice(4, buffer.length)
+        };
+      },
+      toArg: function(value, strict) {
+        if (typeof value !== "number") {
+          throw new Error("expected number");
+        }
+        return binpack.packFloat32(value, "big");
+      }
+    },
+    d: {
+      representation: "double",
+      split: function(buffer, strict) {
+        return {
+          value: binpack.unpackFloat64(buffer.slice(0, 8), "big"),
+          rest: buffer.slice(8, buffer.length)
+        };
+      },
+      toArg: function(value, strict) {
+        if (typeof value !== "number") {
+          throw new Error("expected number");
+        }
+        return binpack.packFloat64(value, "big");
+      }
+    },
+    b: {
+      representation: "blob",
+      split: function(buffer, strict) {
+        var length, ref;
+        ref = exports.splitInteger(buffer), length = ref.integer, buffer = ref.rest;
+        return {
+          value: buffer.slice(0, length),
+          rest: buffer.slice(length, buffer.length)
+        };
+      },
+      toArg: function(value, strict) {
+        var size;
+        if (!Buffer.isBuffer(value)) {
+          throw new Error("expected node.js Buffer");
+        }
+        size = exports.toIntegerBuffer(value.length);
+        return exports.concat([size, value]);
+      }
+    },
+    T: {
+      representation: "true",
+      split: function(buffer, strict) {
+        return {
+          rest: buffer,
+          value: true
+        };
+      },
+      toArg: function(value, strict) {
+        if (!value && strict) {
+          throw new Error("true must be true");
+        }
+        return new Buffer(0);
+      }
+    },
+    F: {
+      representation: "false",
+      split: function(buffer, strict) {
+        return {
+          rest: buffer,
+          value: false
+        };
+      },
+      toArg: function(value, strict) {
+        if (value && strict) {
+          throw new Error("false must be false");
+        }
+        return new Buffer(0);
+      }
+    },
+    N: {
+      representation: "null",
+      split: function(buffer, strict) {
+        return {
+          rest: buffer,
+          value: null
+        };
+      },
+      toArg: function(value, strict) {
+        if (value && strict) {
+          throw new Error("null must be false");
+        }
+        return new Buffer(0);
+      }
+    },
+    I: {
+      representation: "bang",
+      split: function(buffer, strict) {
+        return {
+          rest: buffer,
+          value: "bang"
+        };
+      },
+      toArg: function(value, strict) {
+        return new Buffer(0);
+      }
+    }
+  };
+
+  exports.oscTypeCodeToTypeString = function(code) {
+    var ref;
+    return (ref = oscTypeCodes[code]) != null ? ref.representation : void 0;
+  };
+
+  exports.typeStringToOscTypeCode = function(rep) {
+    var code, str;
+    for (code in oscTypeCodes) {
+      if (!hasProp.call(oscTypeCodes, code)) continue;
+      str = oscTypeCodes[code].representation;
+      if (str === rep) {
+        return code;
+      }
+    }
+    return null;
+  };
+
+  exports.argToTypeCode = function(arg, strict) {
+    var code, value;
+    if (((arg != null ? arg.type : void 0) != null) && (typeof arg.type === 'string') && ((code = exports.typeStringToOscTypeCode(arg.type)) != null)) {
+      return code;
+    }
+    value = (arg != null ? arg.value : void 0) != null ? arg.value : arg;
+    if (strict && (value == null)) {
+      throw new Error('Argument has no value');
+    }
+    if (typeof value === 'string') {
+      return 's';
+    }
+    if (typeof value === 'number') {
+      return 'f';
+    }
+    if (Buffer.isBuffer(value)) {
+      return 'b';
+    }
+    if (typeof value === 'boolean') {
+      if (value) {
+        return 'T';
+      } else {
+        return 'F';
+      }
+    }
+    if (value === null) {
+      return 'N';
+    }
+    throw new Error("I don't know what type this is supposed to be.");
+  };
+
+  exports.splitOscArgument = function(buffer, type, strict) {
+    var osctype;
+    osctype = exports.typeStringToOscTypeCode(type);
+    if (osctype != null) {
+      return oscTypeCodes[osctype].split(buffer, strict);
+    } else {
+      throw new Error("I don't understand how I'm supposed to unpack " + type);
+    }
+  };
+
+  exports.toOscArgument = function(value, type, strict) {
+    var osctype;
+    osctype = exports.typeStringToOscTypeCode(type);
+    if (osctype != null) {
+      return oscTypeCodes[osctype].toArg(value, strict);
+    } else {
+      throw new Error("I don't know how to pack " + type);
+    }
+  };
+
+  exports.fromOscMessage = function(buffer, strict) {
+    var address, arg, args, arrayStack, built, j, len, ref, ref1, type, typeString, types;
+    ref = exports.splitOscString(buffer, strict), address = ref.string, buffer = ref.rest;
+    if (strict && address[0] !== '/') {
+      throw StrictError('addresses must start with /');
+    }
+    if (!buffer.length) {
+      return {
+        address: address,
+        args: []
+      };
+    }
+    ref1 = exports.splitOscString(buffer, strict), types = ref1.string, buffer = ref1.rest;
+    if (types[0] !== ',') {
+      if (strict) {
+        throw StrictError('Argument lists must begin with ,');
+      }
+      return {
+        address: address,
+        args: []
+      };
+    }
+    types = types.slice(1, +types.length + 1 || 9e9);
+    args = [];
+    arrayStack = [args];
+    for (j = 0, len = types.length; j < len; j++) {
+      type = types[j];
+      if (type === '[') {
+        arrayStack.push([]);
+        continue;
+      }
+      if (type === ']') {
+        if (arrayStack.length <= 1) {
+          if (strict) {
+            throw new StrictError("Mismatched ']' character.");
+          }
+        } else {
+          built = arrayStack.pop();
+          arrayStack[arrayStack.length - 1].push({
+            type: 'array',
+            value: built
+          });
+        }
+        continue;
+      }
+      typeString = exports.oscTypeCodeToTypeString(type);
+      if (typeString == null) {
+        throw new Error("I don't understand the argument code " + type);
+      }
+      arg = exports.splitOscArgument(buffer, typeString, strict);
+      if (arg != null) {
+        buffer = arg.rest;
+      }
+      arrayStack[arrayStack.length - 1].push({
+        type: typeString,
+        value: arg != null ? arg.value : void 0
+      });
+    }
+    if (arrayStack.length !== 1 && strict) {
+      throw new StrictError("Mismatched '[' character");
+    }
+    return {
+      address: address,
+      args: args,
+      oscType: "message"
+    };
+  };
+
+  exports.fromOscBundle = function(buffer, strict) {
+    var bundleTag, convertedElems, ref, ref1, timetag;
+    ref = exports.splitOscString(buffer, strict), bundleTag = ref.string, buffer = ref.rest;
+    if (bundleTag !== "\#bundle") {
+      throw new Error("osc-bundles must begin with \#bundle");
+    }
+    ref1 = exports.splitTimetag(buffer), timetag = ref1.timetag, buffer = ref1.rest;
+    convertedElems = mapBundleList(buffer, function(buffer) {
+      return exports.fromOscPacket(buffer, strict);
+    });
+    return {
+      timetag: timetag,
+      elements: convertedElems,
+      oscType: "bundle"
+    };
+  };
+
+  exports.fromOscPacket = function(buffer, strict) {
+    if (isOscBundleBuffer(buffer, strict)) {
+      return exports.fromOscBundle(buffer, strict);
+    } else {
+      return exports.fromOscMessage(buffer, strict);
+    }
+  };
+
+  getArrayArg = function(arg) {
+    if (IsArray(arg)) {
+      return arg;
+    } else if (((arg != null ? arg.type : void 0) === "array") && (IsArray(arg != null ? arg.value : void 0))) {
+      return arg.value;
+    } else if ((arg != null) && (arg.type == null) && (IsArray(arg.value))) {
+      return arg.value;
+    } else {
+      return null;
+    }
+  };
+
+  toOscTypeAndArgs = function(argList, strict) {
+    var arg, buff, j, len, oscargs, osctype, ref, thisArgs, thisType, typeCode, value;
+    osctype = "";
+    oscargs = [];
+    for (j = 0, len = argList.length; j < len; j++) {
+      arg = argList[j];
+      if ((getArrayArg(arg)) != null) {
+        ref = toOscTypeAndArgs(getArrayArg(arg), strict), thisType = ref[0], thisArgs = ref[1];
+        osctype += "[" + thisType + "]";
+        oscargs = oscargs.concat(thisArgs);
+        continue;
+      }
+      typeCode = exports.argToTypeCode(arg, strict);
+      if (typeCode != null) {
+        value = arg != null ? arg.value : void 0;
+        if (value === void 0) {
+          value = arg;
+        }
+        buff = exports.toOscArgument(value, exports.oscTypeCodeToTypeString(typeCode), strict);
+        if (buff != null) {
+          oscargs.push(buff);
+          osctype += typeCode;
+        }
+      }
+    }
+    return [osctype, oscargs];
+  };
+
+  exports.toOscMessage = function(message, strict) {
+    var address, allArgs, args, old_arg, oscaddr, oscargs, osctype, ref;
+    address = (message != null ? message.address : void 0) != null ? message.address : message;
+    if (typeof address !== "string") {
+      throw new Error("message must contain an address");
+    }
+    args = message != null ? message.args : void 0;
+    if (args === void 0) {
+      args = [];
+    }
+    if (!IsArray(args)) {
+      old_arg = args;
+      args = [];
+      args[0] = old_arg;
+    }
+    oscaddr = exports.toOscString(address, strict);
+    ref = toOscTypeAndArgs(args, strict), osctype = ref[0], oscargs = ref[1];
+    osctype = "," + osctype;
+    allArgs = exports.concat(oscargs);
+    osctype = exports.toOscString(osctype);
+    return exports.concat([oscaddr, osctype, allArgs]);
+  };
+
+  exports.toOscBundle = function(bundle, strict) {
+    var allElems, buff, e, elem, elements, elemstr, error, j, len, oscBundleTag, oscElems, oscTimeTag, ref, ref1, size, timetag;
+    if (strict && ((bundle != null ? bundle.timetag : void 0) == null)) {
+      throw StrictError("bundles must have timetags.");
+    }
+    timetag = (ref = bundle != null ? bundle.timetag : void 0) != null ? ref : new Date();
+    elements = (ref1 = bundle != null ? bundle.elements : void 0) != null ? ref1 : [];
+    if (!IsArray(elements)) {
+      elemstr = elements;
+      elements = [];
+      elements.push(elemstr);
+    }
+    oscBundleTag = exports.toOscString("\#bundle");
+    oscTimeTag = exports.toTimetagBuffer(timetag);
+    oscElems = [];
+    for (j = 0, len = elements.length; j < len; j++) {
+      elem = elements[j];
+      try {
+        buff = exports.toOscPacket(elem, strict);
+        size = exports.toIntegerBuffer(buff.length);
+        oscElems.push(exports.concat([size, buff]));
+      } catch (error) {
+        e = error;
+        null;
+      }
+    }
+    allElems = exports.concat(oscElems);
+    return exports.concat([oscBundleTag, oscTimeTag, allElems]);
+  };
+
+  exports.toOscPacket = function(bundleOrMessage, strict) {
+    if ((bundleOrMessage != null ? bundleOrMessage.oscType : void 0) != null) {
+      if (bundleOrMessage.oscType === "bundle") {
+        return exports.toOscBundle(bundleOrMessage, strict);
+      }
+      return exports.toOscMessage(bundleOrMessage, strict);
+    }
+    if (((bundleOrMessage != null ? bundleOrMessage.timetag : void 0) != null) || ((bundleOrMessage != null ? bundleOrMessage.elements : void 0) != null)) {
+      return exports.toOscBundle(bundleOrMessage, strict);
+    }
+    return exports.toOscMessage(bundleOrMessage, strict);
+  };
+
+  exports.applyMessageTranformerToBundle = function(transform) {
+    return function(buffer) {
+      var bundleTagBuffer, copyIndex, elem, elems, j, k, len, len1, lengthBuff, outBuffer, ref, string, timetagBuffer, totalLength;
+      ref = exports.splitOscString(buffer), string = ref.string, buffer = ref.rest;
+      if (string !== "\#bundle") {
+        throw new Error("osc-bundles must begin with \#bundle");
+      }
+      bundleTagBuffer = exports.toOscString(string);
+      timetagBuffer = buffer.slice(0, 8);
+      buffer = buffer.slice(8, buffer.length);
+      elems = mapBundleList(buffer, function(buffer) {
+        return exports.applyTransform(buffer, transform, exports.applyMessageTranformerToBundle(transform));
+      });
+      totalLength = bundleTagBuffer.length + timetagBuffer.length;
+      for (j = 0, len = elems.length; j < len; j++) {
+        elem = elems[j];
+        totalLength += 4 + elem.length;
+      }
+      outBuffer = new Buffer(totalLength);
+      bundleTagBuffer.copy(outBuffer, 0);
+      timetagBuffer.copy(outBuffer, bundleTagBuffer.length);
+      copyIndex = bundleTagBuffer.length + timetagBuffer.length;
+      for (k = 0, len1 = elems.length; k < len1; k++) {
+        elem = elems[k];
+        lengthBuff = exports.toIntegerBuffer(elem.length);
+        lengthBuff.copy(outBuffer, copyIndex);
+        copyIndex += 4;
+        elem.copy(outBuffer, copyIndex);
+        copyIndex += elem.length;
+      }
+      return outBuffer;
+    };
+  };
+
+  exports.applyTransform = function(buffer, mTransform, bundleTransform) {
+    if (bundleTransform == null) {
+      bundleTransform = exports.applyMessageTranformerToBundle(mTransform);
+    }
+    if (isOscBundleBuffer(buffer)) {
+      return bundleTransform(buffer);
+    } else {
+      return mTransform(buffer);
+    }
+  };
+
+  exports.addressTransform = function(transform) {
+    return function(buffer) {
+      var ref, rest, string;
+      ref = exports.splitOscString(buffer), string = ref.string, rest = ref.rest;
+      string = transform(string);
+      return exports.concat([exports.toOscString(string), rest]);
+    };
+  };
+
+  exports.messageTransform = function(transform) {
+    return function(buffer) {
+      var message;
+      message = exports.fromOscMessage(buffer);
+      return exports.toOscMessage(transform(message));
+    };
+  };
+
+  IsArray = Array.isArray;
+
+  StrictError = function(str) {
+    return new Error("Strict Error: " + str);
+  };
+
+  padding = function(str) {
+    var bufflength;
+    bufflength = Buffer.byteLength(str);
+    return 4 - (bufflength % 4);
+  };
+
+  isOscBundleBuffer = function(buffer, strict) {
+    var string;
+    string = exports.splitOscString(buffer, strict).string;
+    return string === "\#bundle";
+  };
+
+  mapBundleList = function(buffer, func) {
+    var e, elem, elems, j, len, nonNullElems, size, thisElemBuffer;
+    elems = (function() {
+      var error, ref, results;
+      results = [];
+      while (buffer.length) {
+        ref = exports.splitInteger(buffer), size = ref.integer, buffer = ref.rest;
+        if (size > buffer.length) {
+          throw new Error("Invalid bundle list: size of element is bigger than buffer");
+        }
+        thisElemBuffer = buffer.slice(0, size);
+        buffer = buffer.slice(size, buffer.length);
+        try {
+          results.push(func(thisElemBuffer));
+        } catch (error) {
+          e = error;
+          results.push(null);
+        }
+      }
+      return results;
+    })();
+    nonNullElems = [];
+    for (j = 0, len = elems.length; j < len; j++) {
+      elem = elems[j];
+      if (elem != null) {
+        nonNullElems.push(elem);
+      }
+    }
+    return nonNullElems;
+  };
+
+}).call(this);