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Refactor AmpContext dependencies for building (ampproject#8258)
* Fix types for AmpContext * Move and split dependencies for ampcontext-lib * Enable type checks for ampcontext-lib
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /** | ||
| * Copyright 2017 The AMP HTML Authors. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS-IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| import {dev} from './log'; | ||
| import {internalListenImplementation} from './event-helper-listen'; | ||
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| /** @const */ | ||
| const AMP_MESSAGE_PREFIX = 'amp-'; | ||
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| /** @enum {string} */ | ||
| export const MessageType = { | ||
| // For amp-ad | ||
| SEND_EMBED_STATE: 'send-embed-state', | ||
| EMBED_STATE: 'embed-state', | ||
| SEND_EMBED_CONTEXT: 'send-embed-context', | ||
| EMBED_CONTEXT: 'embed-context', | ||
| SEND_INTERSECTIONS: 'send-intersections', | ||
| INTERSECTION: 'intersection', | ||
| EMBED_SIZE: 'embed-size', | ||
| EMBED_SIZE_CHANGED: 'embed-size-changed', | ||
| EMBED_SIZE_DENIED: 'embed-size-denied', | ||
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| // For amp-inabox | ||
| SEND_POSITIONS: 'send-positions', | ||
| POSITION: 'position', | ||
| }; | ||
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| /** | ||
| * Listens for the specified event on the element. | ||
| * @param {!EventTarget} element | ||
| * @param {string} eventType | ||
| * @param {function(!Event)} listener | ||
| * @param {boolean=} opt_capture | ||
| * @return {!UnlistenDef} | ||
| */ | ||
| export function listen(element, eventType, listener, opt_capture) { | ||
| return internalListenImplementation( | ||
| element, eventType, listener, opt_capture); | ||
| } | ||
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| /** | ||
| * Serialize an AMP post message. Output looks like: | ||
| * 'amp-011481323099490{"type":"position","sentinel":"12345","foo":"bar"}' | ||
| * @param {string} type | ||
| * @param {string} sentinel | ||
| * @param {Object=} data | ||
| * @param {?string=} rtvVersion | ||
| * @returns {string} | ||
| */ | ||
| export function serializeMessage(type, sentinel, data = {}, rtvVersion = null) { | ||
| // TODO: consider wrap the data in a "data" field. { type, sentinal, data } | ||
| const message = data; | ||
| message.type = type; | ||
| message.sentinel = sentinel; | ||
| return AMP_MESSAGE_PREFIX + (rtvVersion || '') + JSON.stringify(message); | ||
| } | ||
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| /** | ||
| * Deserialize an AMP post message. | ||
| * Returns null if it's not valid AMP message format. | ||
| * | ||
| * @param {*} message | ||
| * @returns {?JSONType} | ||
| */ | ||
| export function deserializeMessage(message) { | ||
| if (!isAmpMessage(message)) { | ||
| return null; | ||
| } | ||
| const startPos = message.indexOf('{'); | ||
| dev().assert(startPos != -1, 'JSON missing in %s', message); | ||
| try { | ||
| return /** @type {!JSONType} */ (JSON.parse(message.substr(startPos))); | ||
| } catch (e) { | ||
| dev().error('MESSAGING', 'Failed to parse message: ' + message, e); | ||
| return null; | ||
| } | ||
| } | ||
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| /** | ||
| * Returns true if message looks like it is an AMP postMessage | ||
| * @param {*} message | ||
| * @return {!boolean} | ||
| */ | ||
| export function isAmpMessage(message) { | ||
| return (typeof message == 'string' && | ||
| message.indexOf(AMP_MESSAGE_PREFIX) == 0 && | ||
| message.indexOf('{') != -1); | ||
| } |
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