Sakurai/pdf.js
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Refactor and fix style of core.js

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This commit is contained in:
Thorben Bochenek 2014-03-14 14:39:35 +01:00
parent 1ddb019449
commit 8edebc797b
1 changed files with 35 additions and 18 deletions
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53
src/core/core.js
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@ -14,7 +14,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* globals assertWellFormed, calculateMD5, Catalog, error, info, isArray,
/* globals assertWellFormed, calculateMD5, Catalog, Dict, error, info, isArray,
isArrayBuffer, isName, isStream, isString, LegacyPromise,
Linearization, NullStream, PartialEvaluator, shadow, Stream, Lexer,
StreamsSequenceStream, stringToPDFString, stringToBytes, Util, XRef,
@ -25,6 +25,8 @@
var Page = (function PageClosure() {
var LETTER_SIZE_MEDIABOX = [0, 0, 612, 792];
function Page(pdfManager, xref, pageIndex, pageDict, ref, fontCache) {
this.pdfManager = pdfManager;
this.pageIndex = pageIndex;
@ -42,20 +44,24 @@ var Page = (function PageClosure() {
getPageProp: function Page_getPageProp(key) {
return this.pageDict.get(key);
},
inheritPageProp: function Page_inheritPageProp(key) {
getInheritedPageProp: function Page_inheritPageProp(key) {
var dict = this.pageDict;
var obj = dict.get(key);
while (obj === undefined) {
var value = dict.get(key);
while (value === undefined) {
dict = dict.get('Parent');
if (!dict)
if (!dict) {
break;
obj = dict.get(key);
}
value = dict.get(key);
}
return obj;
return value;
},
get content() {
return this.getPageProp('Contents');
},
get resources() {
var value = this.getInheritedPageProp('Resources');
// For robustness: The spec states that a \Resources entry has to be
@ -66,34 +72,41 @@ var Page = (function PageClosure() {
}
return shadow(this, 'resources', value);
},
get mediaBox() {
var obj = this.inheritPageProp('MediaBox');
var obj = this.getInheritedPageProp('MediaBox');
// Reset invalid media box to letter size.
if (!isArray(obj) || obj.length !== 4)
obj = [0, 0, 612, 792];
if (!isArray(obj) || obj.length !== 4) {
obj = LETTER_SIZE_MEDIABOX;
}
return shadow(this, 'mediaBox', obj);
},
get view() {
var mediaBox = this.mediaBox;
var cropBox = this.inheritPageProp('CropBox');
if (!isArray(cropBox) || cropBox.length !== 4)
var cropBox = this.getInheritedPageProp('CropBox');
if (!isArray(cropBox) || cropBox.length !== 4) {
return shadow(this, 'view', mediaBox);
}
// From the spec, 6th ed., p.963:
// "The crop, bleed, trim, and art boxes should not ordinarily
// extend beyond the boundaries of the media box. If they do, they are
// effectively reduced to their intersection with the media box."
cropBox = Util.intersect(cropBox, mediaBox);
if (!cropBox)
if (!cropBox) {
return shadow(this, 'view', mediaBox);
}
return shadow(this, 'view', cropBox);
},
get annotationRefs() {
return shadow(this, 'annotationRefs', this.inheritPageProp('Annots'));
return shadow(this, 'annotationRefs',
this.getInheritedPageProp('Annots'));
},
get rotate() {
var rotate = this.inheritPageProp('Rotate') || 0;
var rotate = this.getInheritedPageProp('Rotate') || 0;
// Normalize rotation so it's a multiple of 90 and between 0 and 270
if (rotate % 90 !== 0) {
rotate = 0;
@ -106,6 +119,7 @@ var Page = (function PageClosure() {
}
return shadow(this, 'rotate', rotate);
},
getContentStream: function Page_getContentStream() {
var content = this.content;
var stream;
@ -125,9 +139,10 @@ var Page = (function PageClosure() {
}
return stream;
},
loadResources: function(keys) {
if (!this.resourcesPromise) {
// TODO: add async inheritPageProp and remove this.
// TODO: add async getInheritedPageProp and remove this.
this.resourcesPromise = this.pdfManager.ensure(this, 'resources');
}
var promise = new LegacyPromise();
@ -141,6 +156,7 @@ var Page = (function PageClosure() {
}.bind(this));
return promise;
},
getOperatorList: function Page_getOperatorList(handler, intent) {
var self = this;
var promise = new LegacyPromise();
@ -160,7 +176,7 @@ var Page = (function PageClosure() {
'Pattern',
'Shading',
'XObject',
'Font',
'Font'
// ProcSet
// Properties
]);
@ -208,6 +224,7 @@ var Page = (function PageClosure() {
return promise;
},
extractTextContent: function Page_extractTextContent() {
var handler = {
on: function nullHandlerOn() {},