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Implement a single getInheritableProperty utility function

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This function combines the logic of two separate methods into one.
The loop limit is also a good thing to have for the calls in
`src/core/annotation.js`.

Moreover, since this is important functionality, a set of unit tests and
documentation is added.
This commit is contained in:
Tim van der Meij 2018-02-18 21:42:33 +01:00
parent 4e5eb59a33
commit f308d73d40
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GPG key ID: 8C3FD2925A5F2762
4 changed files with 189 additions and 57 deletions
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54
src/core/document.js
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@ -16,8 +16,8 @@
import { Catalog, ObjectLoader, XRef } from './obj';
import { Dict, isDict, isName, isStream } from './primitives';
import {
info, isArrayBuffer, isNum, isSpace, isString, MissingDataException, OPS,
shadow, stringToBytes, stringToPDFString, Util, warn
getInheritableProperty, info, isArrayBuffer, isNum, isSpace, isString,
MissingDataException, OPS, shadow, stringToBytes, stringToPDFString, Util
} from '../shared/util';
import { NullStream, Stream, StreamsSequenceStream } from './stream';
import { AnnotationFactory } from './annotation';
@ -62,33 +62,19 @@ var Page = (function PageClosure() {
}
Page.prototype = {
getInheritedPageProp: function Page_getInheritedPageProp(key, getArray) {
var dict = this.pageDict, valueArray = null, loopCount = 0;
var MAX_LOOP_COUNT = 100;
getArray = getArray || false;
// Always walk up the entire parent chain, to be able to find
// e.g. \Resources placed on multiple levels of the tree.
while (dict) {
var value = getArray ? dict.getArray(key) : dict.get(key);
if (value !== undefined) {
if (!valueArray) {
valueArray = [];
}
valueArray.push(value);
}
if (++loopCount > MAX_LOOP_COUNT) {
warn('getInheritedPageProp: maximum loop count exceeded for ' + key);
return valueArray ? valueArray[0] : undefined;
}
dict = dict.get('Parent');
/**
* @private
*/
_getInheritableProperty(key, getArray = false) {
let value = getInheritableProperty({ dict: this.pageDict, key, getArray,
stopWhenFound: false, });
if (!Array.isArray(value)) {
return value;
}
if (!valueArray) {
return undefined;
if (value.length === 1 || !isDict(value[0])) {
return value[0];
}
if (valueArray.length === 1 || !isDict(valueArray[0])) {
return valueArray[0];
}
return Dict.merge(this.xref, valueArray);
return Dict.merge(this.xref, value);
},
get content() {
@ -100,11 +86,12 @@ var Page = (function PageClosure() {
// present, but can be empty. Some document omit it still, in this case
// we return an empty dictionary.
return shadow(this, 'resources',
this.getInheritedPageProp('Resources') || Dict.empty);
this._getInheritableProperty('Resources') || Dict.empty);
},
get mediaBox() {
var mediaBox = this.getInheritedPageProp('MediaBox', true);
var mediaBox = this._getInheritableProperty('MediaBox',
/* getArray = */ true);
// Reset invalid media box to letter size.
if (!Array.isArray(mediaBox) || mediaBox.length !== 4) {
return shadow(this, 'mediaBox', LETTER_SIZE_MEDIABOX);
@ -113,7 +100,8 @@ var Page = (function PageClosure() {
},
get cropBox() {
var cropBox = this.getInheritedPageProp('CropBox', true);
var cropBox = this._getInheritableProperty('CropBox',
/* getArray = */ true);
// Reset invalid crop box to media box.
if (!Array.isArray(cropBox) || cropBox.length !== 4) {
return shadow(this, 'cropBox', this.mediaBox);
@ -143,7 +131,7 @@ var Page = (function PageClosure() {
},
get rotate() {
var rotate = this.getInheritedPageProp('Rotate') || 0;
var rotate = this._getInheritableProperty('Rotate') || 0;
// Normalize rotation so it's a multiple of 90 and between 0 and 270
if (rotate % 90 !== 0) {
rotate = 0;
@ -180,7 +168,7 @@ var Page = (function PageClosure() {
loadResources: function Page_loadResources(keys) {
if (!this.resourcesPromise) {
// TODO: add async getInheritedPageProp and remove this.
// TODO: add async `_getInheritableProperty` and remove this.
this.resourcesPromise = this.pdfManager.ensure(this, 'resources');
}
return this.resourcesPromise.then(() => {
@ -316,7 +304,7 @@ var Page = (function PageClosure() {
get annotations() {
var annotations = [];
var annotationRefs = this.getInheritedPageProp('Annots') || [];
var annotationRefs = this._getInheritableProperty('Annots') || [];
for (var i = 0, n = annotationRefs.length; i < n; ++i) {
var annotationRef = annotationRefs[i];
var annotation = AnnotationFactory.create(this.xref, annotationRef,