516 lines
18 KiB
JavaScript
516 lines
18 KiB
JavaScript
// Copyright 2014 Cognitect. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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goog.provide("com.cognitect.transit.impl.writer");
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goog.require("com.cognitect.transit.util");
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goog.require("com.cognitect.transit.caching");
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goog.require("com.cognitect.transit.handlers");
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goog.require("com.cognitect.transit.types");
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goog.require("com.cognitect.transit.delimiters");
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goog.require("goog.math.Long");
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goog.scope(function () {
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var writer = com.cognitect.transit.impl.writer,
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util = com.cognitect.transit.util,
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caching = com.cognitect.transit.caching,
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handlers = com.cognitect.transit.handlers,
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types = com.cognitect.transit.types,
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d = com.cognitect.transit.delimiters,
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Long = goog.math.Long;
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writer.escape = function (string) {
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if (string.length > 0) {
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var c = string.charAt(0);
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if (c === d.ESC || c === d.SUB || c === d.RES) {
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return d.ESC + string;
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} else {
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return string;
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}
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} else {
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return string;
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}
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};
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/**
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* @constructor
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*/
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writer.JSONMarshaller = function Transit$JSONMarshaller(opts) {
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this.opts = opts || {};
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this.preferStrings = this.opts["preferStrings"] != null ? this.opts["preferStrings"] : true;
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this.objectBuilder = this.opts["objectBuilder"] || null;
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this.handlers = new handlers.Handlers();
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var optsHandlers = this.opts["handlers"];
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if (optsHandlers) {
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if (util.isArray(optsHandlers) || !optsHandlers.forEach) {
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throw new Error("transit writer \"handlers\" option must be a map");
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}
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var self = this;
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optsHandlers.forEach(function (v, k) {
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if (k !== undefined) {
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self.handlers.set(k, v);
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} else {
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throw new Error("Cannot create handler for JavaScript undefined");
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}
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});
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}
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// Multiple JS context helper
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this.handlerForForeign = this.opts["handlerForForeign"];
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this.unpack = this.opts["unpack"] || function (x) {
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if (types.isArrayMap(x) && x.backingMap === null) {
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return x._entries;
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} else {
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return false;
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}
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};
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this.verbose = (this.opts && this.opts["verbose"]) || false;
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};
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writer.JSONMarshaller.prototype.handler = function (obj) {
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var h = this.handlers.get(handlers.constructor(obj));
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if (h != null) {
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return h;
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} else {
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var tag = obj && obj["transitTag"];
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if (tag) {
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return this.handlers.get(tag)
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} else {
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return null;
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}
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}
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};
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writer.JSONMarshaller.prototype.registerHandler = function (ctor, handler) {
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this.handlers.set(ctor, handler);
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};
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writer.JSONMarshaller.prototype.emitNil = function (asMapKey, cache) {
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if (asMapKey) {
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return this.emitString(d.ESC, "_", "", asMapKey, cache);
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} else {
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return null;
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}
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};
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writer.JSONMarshaller.prototype.emitString = function (prefix, tag, s, asMapKey, cache) {
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var string = prefix + tag + s;
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if (cache) {
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return cache.write(string, asMapKey);
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} else {
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return string;
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}
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};
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writer.JSONMarshaller.prototype.emitBoolean = function (b, asMapKey, cache) {
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if (asMapKey) {
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var s = b.toString();
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return this.emitString(d.ESC, "?", s[0], asMapKey, cache);
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} else {
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return b;
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}
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};
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writer.JSONMarshaller.prototype.emitInteger = function (i, asMapKey, cache) {
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if (i === Infinity) {
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return this.emitString(d.ESC, "z", "INF", asMapKey, cache);
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} else if (i === -Infinity) {
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return this.emitString(d.ESC, "z", "-INF", asMapKey, cache);
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} else if (isNaN(i)) {
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return this.emitString(d.ESC, "z", "NaN", asMapKey, cache);
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} else if (asMapKey || (typeof i === "string") || (i instanceof Long)) {
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return this.emitString(d.ESC, "i", i.toString(), asMapKey, cache);
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} else {
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return i;
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}
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};
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writer.JSONMarshaller.prototype.emitDouble = function (d, asMapKey, cache) {
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if (asMapKey) {
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return this.emitString(d.ESC, "d", d, asMapKey, cache);
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} else {
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return d;
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}
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};
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writer.JSONMarshaller.prototype.emitBinary = function (b, asMapKey, cache) {
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return this.emitString(d.ESC, "b", b, asMapKey, cache);
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};
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writer.JSONMarshaller.prototype.emitQuoted = function (em, obj, cache) {
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if (em.verbose) {
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var ret = {},
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k = this.emitString(d.ESC_TAG, "'", "", true, cache);
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ret[k] = writer.marshal(this, obj, false, cache);
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return ret;
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} else {
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return [this.emitString(d.ESC_TAG, "'", "", true, cache), writer.marshal(this, obj, false, cache)];
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}
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};
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writer.emitObjects = function (em, iterable, cache) {
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var ret = [];
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if (util.isArray(iterable)) {
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for (var i = 0; i < iterable.length; i++) {
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ret.push(writer.marshal(em, iterable[i], false, cache));
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}
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} else {
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iterable.forEach(function (v, i) {
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ret.push(writer.marshal(em, v, false, cache));
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});
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}
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return ret;
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};
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writer.emitArray = function (em, iterable, skip, cache) {
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return writer.emitObjects(em, iterable, cache);
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};
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writer.isStringableKey = function (em, k) {
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if (typeof k !== "string") {
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var h = em.handler(k);
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return h && h.tag(k).length === 1;
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} else {
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return true;
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}
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};
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/**
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* Returns true if map-like obj parameter has only stringable keys -
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* strings, symbols or keywords. If false, obj is a cmap value.
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* @param em
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* @param obj
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* @returns {boolean}
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*/
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writer.stringableKeys = function (em, obj) {
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var arr = em.unpack(obj),
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stringableKeys = true;
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if (arr) {
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for (var i = 0; i < arr.length; i += 2) {
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stringableKeys = writer.isStringableKey(em, arr[i]);
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if (!stringableKeys) {
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break;
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}
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}
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return stringableKeys;
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} else if (obj.keys) {
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var iter = obj.keys(),
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step = null;
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if (iter.next) {
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step = iter.next();
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while (!step.done) {
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stringableKeys = writer.isStringableKey(em, step.value);
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if (!stringableKeys) {
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break;
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}
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step = iter.next();
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}
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return stringableKeys;
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}
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}
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if (obj.forEach) {
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obj.forEach(function (v, k) {
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stringableKeys = stringableKeys && writer.isStringableKey(em, k);
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});
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return stringableKeys;
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} else {
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throw new Error("Cannot walk keys of object type " + handlers.constructor(obj).name);
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}
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};
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/**
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* Returns true if x is an Object instance from a different JavaScript
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* context.
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* @param x
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* @returns {boolean}
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*/
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writer.isForeignObject = function (x) {
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if (x.constructor["transit$isObject"]) {
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return true;
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}
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var ret = x.constructor.toString();
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ret = ret.substr('function '.length);
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ret = ret.substr(0, ret.indexOf('('));
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isObject = ret == "Object";
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if (typeof Object.defineProperty != "undefined") {
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Object.defineProperty(x.constructor, "transit$isObject", {
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value: isObject,
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enumerable: false
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});
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} else {
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x.constructor["transit$isObject"] = isObject;
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}
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return isObject;
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};
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writer.emitMap = function (em, obj, skip, cache) {
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var arr = null, rep = null, tag = null, ks = null, i = 0;
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if ((obj.constructor === Object) ||
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(obj.forEach != null) ||
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(em.handlerForForeign && writer.isForeignObject(obj))) {
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if (em.verbose) {
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if (obj.forEach != null) {
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if (writer.stringableKeys(em, obj)) {
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var ret = {};
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obj.forEach(function (v, k) {
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ret[writer.marshal(em, k, true, false)] = writer.marshal(em, v, false, cache);
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});
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return ret;
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} else {
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arr = em.unpack(obj);
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rep = [];
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tag = em.emitString(d.ESC_TAG, "cmap", "", true, cache);
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if (arr) {
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for (; i < arr.length; i += 2) {
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rep.push(writer.marshal(em, arr[i], false, false));
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rep.push(writer.marshal(em, arr[i + 1], false, cache));
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}
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} else {
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obj.forEach(function (v, k) {
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rep.push(writer.marshal(em, k, false, false));
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rep.push(writer.marshal(em, v, false, cache));
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});
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}
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ret = {};
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ret[tag] = rep;
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return ret;
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}
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} else {
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ks = util.objectKeys(obj);
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ret = {};
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for (; i < ks.length; i++) {
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ret[writer.marshal(em, ks[i], true, false)] = writer.marshal(em, obj[ks[i]], false, cache);
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}
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return ret;
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}
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} else {
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if (obj.forEach != null) {
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if (writer.stringableKeys(em, obj)) {
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arr = em.unpack(obj);
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ret = ["^ "];
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if (arr) {
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for (; i < arr.length; i += 2) {
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ret.push(writer.marshal(em, arr[i], true, cache));
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ret.push(writer.marshal(em, arr[i + 1], false, cache));
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}
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} else {
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obj.forEach(function (v, k) {
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ret.push(writer.marshal(em, k, true, cache));
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ret.push(writer.marshal(em, v, false, cache));
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});
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}
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return ret;
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} else {
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arr = em.unpack(obj);
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rep = [];
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tag = em.emitString(d.ESC_TAG, "cmap", "", true, cache);
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if (arr) {
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for (; i < arr.length; i += 2) {
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rep.push(writer.marshal(em, arr[i], false, cache));
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rep.push(writer.marshal(em, arr[i + 1], false, cache));
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}
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} else {
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obj.forEach(function (v, k) {
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rep.push(writer.marshal(em, k, false, cache));
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rep.push(writer.marshal(em, v, false, cache));
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});
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}
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return [tag, rep];
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}
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} else {
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ret = ["^ "];
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ks = util.objectKeys(obj);
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for (; i < ks.length; i++) {
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ret.push(writer.marshal(em, ks[i], true, cache));
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ret.push(writer.marshal(em, obj[ks[i]], false, cache));
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}
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return ret;
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}
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}
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} else if (em.objectBuilder != null) {
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return em.objectBuilder(obj, function (k) {
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return writer.marshal(em, k, true, cache);
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},
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function (v) {
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return writer.marshal(em, v, false, cache);
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});
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} else {
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var name = handlers.constructor(obj).name,
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err = new Error("Cannot write " + name);
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err.data = {obj: obj, type: name};
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throw err;
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}
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};
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writer.emitTaggedMap = function (em, tag, rep, skip, cache) {
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if (em.verbose) {
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var ret = {};
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ret[em.emitString(d.ESC_TAG, tag, "", true, cache)] = writer.marshal(em, rep, false, cache);
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return ret;
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} else {
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return [em.emitString(d.ESC_TAG, tag, "", true, cache), writer.marshal(em, rep, false, cache)];
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}
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};
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writer.emitEncoded = function (em, h, tag, rep, obj, asMapKey, cache) {
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if (tag.length === 1) {
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if (typeof rep === "string") {
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return em.emitString(d.ESC, tag, rep, asMapKey, cache);
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} else if (asMapKey || em.preferStrings) {
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var vh = em.verbose && h.getVerboseHandler();
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if (vh) {
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tag = vh.tag(obj);
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rep = vh.stringRep(obj, vh);
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} else {
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rep = h.stringRep(obj, h);
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}
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if (rep !== null) {
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return em.emitString(d.ESC, tag, rep, asMapKey, cache);
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} else {
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var err = new Error("Tag \"" + tag + "\" cannot be encoded as string");
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err.data = {tag: tag, rep: rep, obj: obj};
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throw err;
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}
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} else {
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return writer.emitTaggedMap(em, tag, rep, asMapKey, cache);
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}
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} else {
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return writer.emitTaggedMap(em, tag, rep, asMapKey, cache);
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}
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};
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writer.marshal = function (em, obj, asMapKey, cache) {
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var h = em.handler(obj) || (em.handlerForForeign ? em.handlerForForeign(obj, em.handlers) : null),
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tag = h ? h.tag(obj) : null,
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rep = h ? h.rep(obj) : null;
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if (h != null && tag != null) {
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switch (tag) {
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case "_":
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return em.emitNil(asMapKey, cache);
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break;
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case "s":
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return em.emitString("", "", writer.escape(rep), asMapKey, cache);
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break;
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case "?":
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return em.emitBoolean(rep, asMapKey, cache);
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break;
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case "i":
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return em.emitInteger(rep, asMapKey, cache);
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break;
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case "d":
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return em.emitDouble(rep, asMapKey, cache);
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break;
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case "b":
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return em.emitBinary(rep, asMapKey, cache);
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break;
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case "'":
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return em.emitQuoted(em, rep, cache);
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break;
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case "array":
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return writer.emitArray(em, rep, asMapKey, cache);
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break;
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case "map":
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return writer.emitMap(em, rep, asMapKey, cache);
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break;
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default:
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return writer.emitEncoded(em, h, tag, rep, obj, asMapKey, cache);
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break;
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}
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} else {
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var name = handlers.constructor(obj).name,
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err = new Error("Cannot write " + name);
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err.data = {obj: obj, type: name};
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throw err;
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}
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};
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writer.maybeQuoted = function (em, obj) {
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var h = em.handler(obj) || (em.handlerForForeign ? em.handlerForForeign(obj, em.handlers) : null);
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if (h != null) {
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if (h.tag(obj).length === 1) {
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return types.quoted(obj);
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} else {
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return obj;
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}
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} else {
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var name = handlers.constructor(obj).name,
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err = new Error("Cannot write " + name);
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err.data = {obj: obj, type: name};
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throw err;
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}
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};
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writer.marshalTop = function (em, obj, asMapKey, cache) {
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return JSON.stringify(writer.marshal(em, writer.maybeQuoted(em, obj), asMapKey, cache));
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};
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/**
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* @constructor
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*/
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writer.Writer = function Transit$Writer(marshaller, options) {
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this._marshaller = marshaller;
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this.options = options || {};
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if (this.options["cache"] === false) {
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this.cache = null;
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} else {
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this.cache = this.options["cache"] ? this.options["cache"] : new caching.WriteCache();
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}
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};
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writer.Writer.prototype.marshaller = function () {
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return this._marshaller;
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};
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writer.Writer.prototype["marshaller"] = writer.Writer.prototype.marshaller;
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writer.Writer.prototype.write = function (obj, opts) {
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var ret = null,
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ropts = opts || {},
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asMapKey = ropts["asMapKey"] || false,
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cache = this._marshaller.verbose ? false : this.cache;
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if (ropts["marshalTop"] === false) {
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ret = writer.marshal(this._marshaller, obj, asMapKey, cache)
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} else {
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ret = writer.marshalTop(this._marshaller, obj, asMapKey, cache)
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}
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if (this.cache != null) {
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this.cache.clear();
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}
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return ret;
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};
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writer.Writer.prototype["write"] = writer.Writer.prototype.write;
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writer.Writer.prototype.register = function (type, handler) {
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this._marshaller.registerHandler(type, handler);
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};
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writer.Writer.prototype["register"] = writer.Writer.prototype.register;
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});
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