pdfjs-dist
Version:
Generic build of Mozilla's PDF.js library.
219 lines (218 loc) • 6.32 kB
JavaScript
/**
* @licstart The following is the entire license notice for the
* JavaScript code in this page
*
* Copyright 2022 Mozilla Foundation
*
* 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.
*
* @licend The above is the entire license notice for the
* JavaScript code in this page
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.OptionalContentConfig = void 0;
var _util = require("../shared/util.js");
var _murmurhash = require("../shared/murmurhash3.js");
const INTERNAL = Symbol("INTERNAL");
class OptionalContentGroup {
#visible = true;
constructor(name, intent) {
this.name = name;
this.intent = intent;
}
get visible() {
return this.#visible;
}
_setVisible(internal, visible) {
if (internal !== INTERNAL) {
(0, _util.unreachable)("Internal method `_setVisible` called.");
}
this.#visible = visible;
}
}
class OptionalContentConfig {
#cachedGetHash = null;
#groups = new Map();
#initialHash = null;
#order = null;
constructor(data) {
this.name = null;
this.creator = null;
if (data === null) {
return;
}
this.name = data.name;
this.creator = data.creator;
this.#order = data.order;
for (const group of data.groups) {
this.#groups.set(group.id, new OptionalContentGroup(group.name, group.intent));
}
if (data.baseState === "OFF") {
for (const group of this.#groups.values()) {
group._setVisible(INTERNAL, false);
}
}
for (const on of data.on) {
this.#groups.get(on)._setVisible(INTERNAL, true);
}
for (const off of data.off) {
this.#groups.get(off)._setVisible(INTERNAL, false);
}
this.#initialHash = this.getHash();
}
#evaluateVisibilityExpression(array) {
const length = array.length;
if (length < 2) {
return true;
}
const operator = array[0];
for (let i = 1; i < length; i++) {
const element = array[i];
let state;
if (Array.isArray(element)) {
state = this.#evaluateVisibilityExpression(element);
} else if (this.#groups.has(element)) {
state = this.#groups.get(element).visible;
} else {
(0, _util.warn)(`Optional content group not found: ${element}`);
return true;
}
switch (operator) {
case "And":
if (!state) {
return false;
}
break;
case "Or":
if (state) {
return true;
}
break;
case "Not":
return !state;
default:
return true;
}
}
return operator === "And";
}
isVisible(group) {
if (this.#groups.size === 0) {
return true;
}
if (!group) {
(0, _util.warn)("Optional content group not defined.");
return true;
}
if (group.type === "OCG") {
if (!this.#groups.has(group.id)) {
(0, _util.warn)(`Optional content group not found: ${group.id}`);
return true;
}
return this.#groups.get(group.id).visible;
} else if (group.type === "OCMD") {
if (group.expression) {
return this.#evaluateVisibilityExpression(group.expression);
}
if (!group.policy || group.policy === "AnyOn") {
for (const id of group.ids) {
if (!this.#groups.has(id)) {
(0, _util.warn)(`Optional content group not found: ${id}`);
return true;
}
if (this.#groups.get(id).visible) {
return true;
}
}
return false;
} else if (group.policy === "AllOn") {
for (const id of group.ids) {
if (!this.#groups.has(id)) {
(0, _util.warn)(`Optional content group not found: ${id}`);
return true;
}
if (!this.#groups.get(id).visible) {
return false;
}
}
return true;
} else if (group.policy === "AnyOff") {
for (const id of group.ids) {
if (!this.#groups.has(id)) {
(0, _util.warn)(`Optional content group not found: ${id}`);
return true;
}
if (!this.#groups.get(id).visible) {
return true;
}
}
return false;
} else if (group.policy === "AllOff") {
for (const id of group.ids) {
if (!this.#groups.has(id)) {
(0, _util.warn)(`Optional content group not found: ${id}`);
return true;
}
if (this.#groups.get(id).visible) {
return false;
}
}
return true;
}
(0, _util.warn)(`Unknown optional content policy ${group.policy}.`);
return true;
}
(0, _util.warn)(`Unknown group type ${group.type}.`);
return true;
}
setVisibility(id, visible = true) {
if (!this.#groups.has(id)) {
(0, _util.warn)(`Optional content group not found: ${id}`);
return;
}
this.#groups.get(id)._setVisible(INTERNAL, !!visible);
this.#cachedGetHash = null;
}
get hasInitialVisibility() {
return this.getHash() === this.#initialHash;
}
getOrder() {
if (!this.#groups.size) {
return null;
}
if (this.#order) {
return this.#order.slice();
}
return [...this.#groups.keys()];
}
getGroups() {
return this.#groups.size > 0 ? (0, _util.objectFromMap)(this.#groups) : null;
}
getGroup(id) {
return this.#groups.get(id) || null;
}
getHash() {
if (this.#cachedGetHash !== null) {
return this.#cachedGetHash;
}
const hash = new _murmurhash.MurmurHash3_64();
for (const [id, group] of this.#groups) {
hash.update(`${id}:${group.visible}`);
}
return this.#cachedGetHash = hash.hexdigest();
}
}
exports.OptionalContentConfig = OptionalContentConfig;