Convert the Page class in src/core/document.js to ES6 syntax
This commit is contained in:
Tim van der Meij
parent
85363f4566
commit
612fc9fcc2
@ -28,18 +28,17 @@ import { OperatorList } from './operator_list';
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import { PartialEvaluator } from './evaluator';
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import { PDFFunctionFactory } from './function';
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var Page = (function PageClosure() {
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const DEFAULT_USER_UNIT = 1.0;
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const LETTER_SIZE_MEDIABOX = [0, 0, 612, 792];
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var DEFAULT_USER_UNIT = 1.0;
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var LETTER_SIZE_MEDIABOX = [0, 0, 612, 792];
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function isAnnotationRenderable(annotation, intent) {
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return (intent === 'display' && annotation.viewable) ||
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(intent === 'print' && annotation.printable);
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}
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function isAnnotationRenderable(annotation, intent) {
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return (intent === 'display' && annotation.viewable) ||
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(intent === 'print' && annotation.printable);
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}
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function Page({ pdfManager, xref, pageIndex, pageDict, ref, fontCache,
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builtInCMapCache, pdfFunctionFactory, }) {
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class Page {
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constructor({ pdfManager, xref, pageIndex, pageDict, ref, fontCache,
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builtInCMapCache, pdfFunctionFactory, }) {
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this.pdfManager = pdfManager;
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this.pageIndex = pageIndex;
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this.pageDict = pageDict;
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@ -51,8 +50,8 @@ var Page = (function PageClosure() {
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this.evaluatorOptions = pdfManager.evaluatorOptions;
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this.resourcesPromise = null;
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var uniquePrefix = 'p' + this.pageIndex + '_';
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var idCounters = {
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const uniquePrefix = `p${this.pageIndex}_`;
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const idCounters = {
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obj: 0,
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};
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this.idFactory = {
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@ -62,138 +61,211 @@ var Page = (function PageClosure() {
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};
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}
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Page.prototype = {
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/**
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* @private
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*/
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_getInheritableProperty(key, getArray = false) {
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let value = getInheritableProperty({ dict: this.pageDict, key, getArray,
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/**
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* @private
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*/
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_getInheritableProperty(key, getArray = false) {
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const value = getInheritableProperty({ dict: this.pageDict, key, getArray,
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stopWhenFound: false, });
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if (!Array.isArray(value)) {
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return value;
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}
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if (value.length === 1 || !isDict(value[0])) {
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return value[0];
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}
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return Dict.merge(this.xref, value);
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},
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if (!Array.isArray(value)) {
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return value;
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}
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if (value.length === 1 || !isDict(value[0])) {
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return value[0];
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}
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return Dict.merge(this.xref, value);
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}
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get content() {
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return this.pageDict.get('Contents');
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},
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get content() {
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return this.pageDict.get('Contents');
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}
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get resources() {
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// For robustness: The spec states that a \Resources entry has to be
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// present, but can be empty. Some document omit it still, in this case
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// we return an empty dictionary.
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return shadow(this, 'resources',
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this._getInheritableProperty('Resources') || Dict.empty);
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},
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get resources() {
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// For robustness: The spec states that a \Resources entry has to be
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// present, but can be empty. Some documents still omit it; in this case
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// we return an empty dictionary.
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return shadow(this, 'resources',
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this._getInheritableProperty('Resources') || Dict.empty);
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}
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get mediaBox() {
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var mediaBox = this._getInheritableProperty('MediaBox',
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get mediaBox() {
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const mediaBox = this._getInheritableProperty('MediaBox',
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/* getArray = */ true);
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// Reset invalid media box to letter size.
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if (!Array.isArray(mediaBox) || mediaBox.length !== 4) {
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return shadow(this, 'mediaBox', LETTER_SIZE_MEDIABOX);
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}
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return shadow(this, 'mediaBox', mediaBox);
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},
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// Reset invalid media box to letter size.
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if (!Array.isArray(mediaBox) || mediaBox.length !== 4) {
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return shadow(this, 'mediaBox', LETTER_SIZE_MEDIABOX);
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}
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return shadow(this, 'mediaBox', mediaBox);
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}
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get cropBox() {
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var cropBox = this._getInheritableProperty('CropBox',
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get cropBox() {
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const cropBox = this._getInheritableProperty('CropBox',
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/* getArray = */ true);
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// Reset invalid crop box to media box.
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if (!Array.isArray(cropBox) || cropBox.length !== 4) {
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return shadow(this, 'cropBox', this.mediaBox);
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// Reset invalid crop box to media box.
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if (!Array.isArray(cropBox) || cropBox.length !== 4) {
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return shadow(this, 'cropBox', this.mediaBox);
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}
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return shadow(this, 'cropBox', cropBox);
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}
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get userUnit() {
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let obj = this.pageDict.get('UserUnit');
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if (!isNum(obj) || obj <= 0) {
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obj = DEFAULT_USER_UNIT;
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}
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return shadow(this, 'userUnit', obj);
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}
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get view() {
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// From the spec, 6th ed., p.963:
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// "The crop, bleed, trim, and art boxes should not ordinarily
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// extend beyond the boundaries of the media box. If they do, they are
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// effectively reduced to their intersection with the media box."
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const mediaBox = this.mediaBox, cropBox = this.cropBox;
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if (mediaBox === cropBox) {
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return shadow(this, 'view', mediaBox);
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}
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const intersection = Util.intersect(cropBox, mediaBox);
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return shadow(this, 'view', intersection || mediaBox);
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}
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get rotate() {
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let rotate = this._getInheritableProperty('Rotate') || 0;
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// Normalize rotation so it's a multiple of 90 and between 0 and 270.
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if (rotate % 90 !== 0) {
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rotate = 0;
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} else if (rotate >= 360) {
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rotate = rotate % 360;
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} else if (rotate < 0) {
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// The spec doesn't cover negatives. Assume it's counterclockwise
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// rotation. The following is the other implementation of modulo.
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rotate = ((rotate % 360) + 360) % 360;
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}
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return shadow(this, 'rotate', rotate);
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}
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getContentStream() {
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const content = this.content;
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let stream;
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if (Array.isArray(content)) {
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// Fetching the individual streams from the array.
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const xref = this.xref;
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const streams = [];
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for (const stream of content) {
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streams.push(xref.fetchIfRef(stream));
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}
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return shadow(this, 'cropBox', cropBox);
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},
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stream = new StreamsSequenceStream(streams);
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} else if (isStream(content)) {
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stream = content;
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} else {
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// Replace non-existent page content with empty content.
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stream = new NullStream();
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}
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return stream;
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}
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get userUnit() {
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var obj = this.pageDict.get('UserUnit');
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if (!isNum(obj) || obj <= 0) {
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obj = DEFAULT_USER_UNIT;
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}
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return shadow(this, 'userUnit', obj);
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},
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loadResources(keys) {
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if (!this.resourcesPromise) {
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// TODO: add async `_getInheritableProperty` and remove this.
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this.resourcesPromise = this.pdfManager.ensure(this, 'resources');
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}
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return this.resourcesPromise.then(() => {
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const objectLoader = new ObjectLoader(this.resources, keys, this.xref);
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return objectLoader.load();
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});
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}
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get view() {
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// From the spec, 6th ed., p.963:
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// "The crop, bleed, trim, and art boxes should not ordinarily
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// extend beyond the boundaries of the media box. If they do, they are
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// effectively reduced to their intersection with the media box."
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var mediaBox = this.mediaBox, cropBox = this.cropBox;
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if (mediaBox === cropBox) {
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return shadow(this, 'view', mediaBox);
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}
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var intersection = Util.intersect(cropBox, mediaBox);
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return shadow(this, 'view', intersection || mediaBox);
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},
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get rotate() {
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var rotate = this._getInheritableProperty('Rotate') || 0;
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// Normalize rotation so it's a multiple of 90 and between 0 and 270
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if (rotate % 90 !== 0) {
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rotate = 0;
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} else if (rotate >= 360) {
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rotate = rotate % 360;
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} else if (rotate < 0) {
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// The spec doesn't cover negatives, assume its counterclockwise
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// rotation. The following is the other implementation of modulo.
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rotate = ((rotate % 360) + 360) % 360;
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}
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return shadow(this, 'rotate', rotate);
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},
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getContentStream: function Page_getContentStream() {
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var content = this.content;
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var stream;
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if (Array.isArray(content)) {
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// fetching items
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var xref = this.xref;
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var i, n = content.length;
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var streams = [];
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for (i = 0; i < n; ++i) {
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streams.push(xref.fetchIfRef(content[i]));
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}
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stream = new StreamsSequenceStream(streams);
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} else if (isStream(content)) {
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stream = content;
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} else {
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// replacing non-existent page content with empty one
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stream = new NullStream();
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}
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return stream;
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},
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loadResources: function Page_loadResources(keys) {
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if (!this.resourcesPromise) {
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// TODO: add async `_getInheritableProperty` and remove this.
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this.resourcesPromise = this.pdfManager.ensure(this, 'resources');
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}
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return this.resourcesPromise.then(() => {
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let objectLoader = new ObjectLoader(this.resources, keys, this.xref);
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return objectLoader.load();
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});
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},
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getOperatorList({ handler, task, intent, renderInteractiveForms, }) {
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var contentStreamPromise = this.pdfManager.ensure(this,
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getOperatorList({ handler, task, intent, renderInteractiveForms, }) {
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const contentStreamPromise = this.pdfManager.ensure(this,
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'getContentStream');
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var resourcesPromise = this.loadResources([
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'ExtGState',
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'ColorSpace',
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'Pattern',
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'Shading',
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'XObject',
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'Font'
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// ProcSet
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// Properties
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]);
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const resourcesPromise = this.loadResources([
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'ExtGState',
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'ColorSpace',
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'Pattern',
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'Shading',
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'XObject',
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'Font',
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]);
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var partialEvaluator = new PartialEvaluator({
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const partialEvaluator = new PartialEvaluator({
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pdfManager: this.pdfManager,
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xref: this.xref,
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handler,
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pageIndex: this.pageIndex,
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idFactory: this.idFactory,
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fontCache: this.fontCache,
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builtInCMapCache: this.builtInCMapCache,
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options: this.evaluatorOptions,
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pdfFunctionFactory: this.pdfFunctionFactory,
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});
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const dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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const pageListPromise = dataPromises.then(([contentStream]) => {
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const opList = new OperatorList(intent, handler, this.pageIndex);
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handler.send('StartRenderPage', {
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transparency: partialEvaluator.hasBlendModes(this.resources),
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pageIndex: this.pageIndex,
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intent,
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});
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return partialEvaluator.getOperatorList({
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stream: contentStream,
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task,
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resources: this.resources,
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operatorList: opList,
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}).then(function() {
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return opList;
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});
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});
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// Fetch the page's annotations and add their operator lists to the
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// page's operator list to render them.
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return Promise.all([pageListPromise, this._parsedAnnotations]).then(
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function([pageOpList, annotations]) {
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if (annotations.length === 0) {
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pageOpList.flush(true);
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return pageOpList;
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}
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// Collect the operator list promises for the annotations. Each promise
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// is resolved with the complete operator list for a single annotation.
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const opListPromises = [];
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for (const annotation of annotations) {
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if (isAnnotationRenderable(annotation, intent)) {
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opListPromises.push(annotation.getOperatorList(
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partialEvaluator, task, renderInteractiveForms));
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}
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}
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return Promise.all(opListPromises).then(function(opLists) {
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pageOpList.addOp(OPS.beginAnnotations, []);
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for (const opList of opLists) {
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pageOpList.addOpList(opList);
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}
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pageOpList.addOp(OPS.endAnnotations, []);
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pageOpList.flush(true);
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return pageOpList;
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});
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});
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}
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extractTextContent({ handler, task, normalizeWhitespace, sink,
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combineTextItems, }) {
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const contentStreamPromise = this.pdfManager.ensure(this,
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'getContentStream');
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const resourcesPromise = this.loadResources([
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'ExtGState',
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'XObject',
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'Font',
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]);
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const dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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return dataPromises.then(([contentStream]) => {
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const partialEvaluator = new PartialEvaluator({
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pdfManager: this.pdfManager,
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xref: this.xref,
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handler,
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@ -205,135 +277,57 @@ var Page = (function PageClosure() {
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pdfFunctionFactory: this.pdfFunctionFactory,
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});
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var dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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var pageListPromise = dataPromises.then(([contentStream]) => {
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var opList = new OperatorList(intent, handler, this.pageIndex);
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handler.send('StartRenderPage', {
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transparency: partialEvaluator.hasBlendModes(this.resources),
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pageIndex: this.pageIndex,
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intent,
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});
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return partialEvaluator.getOperatorList({
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stream: contentStream,
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task,
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resources: this.resources,
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operatorList: opList,
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}).then(function () {
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return opList;
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});
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return partialEvaluator.getTextContent({
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stream: contentStream,
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task,
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resources: this.resources,
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normalizeWhitespace,
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combineTextItems,
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sink,
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});
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});
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}
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// Fetch the page's annotations and add their operator lists to the
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// page's operator list to render them.
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return Promise.all([pageListPromise, this._parsedAnnotations]).then(
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function ([pageOpList, annotations]) {
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if (annotations.length === 0) {
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pageOpList.flush(true);
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return pageOpList;
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getAnnotationsData(intent) {
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return this._parsedAnnotations.then(function(annotations) {
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const annotationsData = [];
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for (let i = 0, ii = annotations.length; i < ii; i++) {
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if (!intent || isAnnotationRenderable(annotations[i], intent)) {
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annotationsData.push(annotations[i].data);
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}
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}
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return annotationsData;
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});
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}
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get annotations() {
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return shadow(this, 'annotations',
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this._getInheritableProperty('Annots') || []);
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}
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get _parsedAnnotations() {
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const parsedAnnotations =
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this.pdfManager.ensure(this, 'annotations').then(() => {
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const annotationRefs = this.annotations;
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const annotationPromises = [];
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for (let i = 0, ii = annotationRefs.length; i < ii; i++) {
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annotationPromises.push(AnnotationFactory.create(
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this.xref, annotationRefs[i], this.pdfManager, this.idFactory));
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}
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// Collect the operator list promises for the annotations. Each promise
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// is resolved with the complete operator list for a single annotation.
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var i, ii, opListPromises = [];
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for (i = 0, ii = annotations.length; i < ii; i++) {
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if (isAnnotationRenderable(annotations[i], intent)) {
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opListPromises.push(annotations[i].getOperatorList(
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partialEvaluator, task, renderInteractiveForms));
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}
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}
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return Promise.all(opListPromises).then(function(opLists) {
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pageOpList.addOp(OPS.beginAnnotations, []);
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for (i = 0, ii = opLists.length; i < ii; i++) {
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pageOpList.addOpList(opLists[i]);
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}
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pageOpList.addOp(OPS.endAnnotations, []);
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pageOpList.flush(true);
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return pageOpList;
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});
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});
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},
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extractTextContent({ handler, task, normalizeWhitespace,
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sink, combineTextItems, }) {
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var contentStreamPromise = this.pdfManager.ensure(this,
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'getContentStream');
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var resourcesPromise = this.loadResources([
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'ExtGState',
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'XObject',
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'Font'
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]);
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var dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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return dataPromises.then(([contentStream]) => {
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var partialEvaluator = new PartialEvaluator({
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pdfManager: this.pdfManager,
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xref: this.xref,
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handler,
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pageIndex: this.pageIndex,
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idFactory: this.idFactory,
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fontCache: this.fontCache,
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builtInCMapCache: this.builtInCMapCache,
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options: this.evaluatorOptions,
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pdfFunctionFactory: this.pdfFunctionFactory,
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});
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return partialEvaluator.getTextContent({
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stream: contentStream,
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task,
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resources: this.resources,
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normalizeWhitespace,
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combineTextItems,
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sink,
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});
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});
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},
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|
||||
getAnnotationsData(intent) {
|
||||
return this._parsedAnnotations.then(function(annotations) {
|
||||
let annotationsData = [];
|
||||
for (let i = 0, ii = annotations.length; i < ii; i++) {
|
||||
if (!intent || isAnnotationRenderable(annotations[i], intent)) {
|
||||
annotationsData.push(annotations[i].data);
|
||||
}
|
||||
}
|
||||
return annotationsData;
|
||||
});
|
||||
},
|
||||
|
||||
get annotations() {
|
||||
return shadow(this, 'annotations',
|
||||
this._getInheritableProperty('Annots') || []);
|
||||
},
|
||||
|
||||
get _parsedAnnotations() {
|
||||
const parsedAnnotations =
|
||||
this.pdfManager.ensure(this, 'annotations').then(() => {
|
||||
const annotationRefs = this.annotations;
|
||||
const annotationPromises = [];
|
||||
for (let i = 0, ii = annotationRefs.length; i < ii; i++) {
|
||||
annotationPromises.push(AnnotationFactory.create(
|
||||
this.xref, annotationRefs[i], this.pdfManager, this.idFactory));
|
||||
}
|
||||
|
||||
return Promise.all(annotationPromises).then(function(annotations) {
|
||||
return annotations.filter(function isDefined(annotation) {
|
||||
return !!annotation;
|
||||
});
|
||||
}, function(reason) {
|
||||
warn(`_parsedAnnotations: "${reason}".`);
|
||||
return [];
|
||||
return Promise.all(annotationPromises).then(function(annotations) {
|
||||
return annotations.filter(function isDefined(annotation) {
|
||||
return !!annotation;
|
||||
});
|
||||
}, function(reason) {
|
||||
warn(`_parsedAnnotations: "${reason}".`);
|
||||
return [];
|
||||
});
|
||||
});
|
||||
|
||||
return shadow(this, '_parsedAnnotations', parsedAnnotations);
|
||||
},
|
||||
};
|
||||
|
||||
return Page;
|
||||
})();
|
||||
return shadow(this, '_parsedAnnotations', parsedAnnotations);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* The `PDFDocument` holds all the data of the PDF file. Compared to the
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user