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use defineProperty to shadow getters

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This commit is contained in:
Andreas Gal 2011-05-13 00:19:50 -07:00
parent d8366507d0
commit a4c5b6095b
2 changed files with 17 additions and 9 deletions
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17
pdf.js
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@ -12,9 +12,14 @@ function error(msg) {
throw new Error(msg);
}
function shadow(obj, prop, value) {
Object.defineProperty(obj, prop, { value: value, enumerable: true });
return value;
}
var Stream = (function() {
function constructor(arrayBuffer) {
this.bytes = Uint8Array(arrayBuffer);
this.bytes = new Uint8Array(arrayBuffer);
this.pos = 0;
this.start = 0;
}
@ -1857,14 +1862,14 @@ var Catalog = (function() {
if (!IsDict(obj))
error("invalid top-level pages dictionary");
// shadow the prototype getter
return this.toplevelPagesDict = obj;
return shadow(this, "toplevelPagesDict", obj);
},
get numPages() {
obj = this.toplevelPagesDict.get("Count");
if (!IsInt(obj))
error("page count in top level pages object is not an integer");
// shadow the prototype getter
return this.numPages = obj;
return shadow(this, "num", obj);
},
traverseKids: function(pagesDict) {
var pageCache = this.pageCache;
@ -1930,7 +1935,7 @@ var PDFDoc = (function() {
linearization = false;
}
// shadow the prototype getter with a data property
return this.linearization = linearization;
return shadow(this, "linearization", linearization);
},
get startXRef() {
var stream = this.stream;
@ -1963,7 +1968,7 @@ var PDFDoc = (function() {
}
}
// shadow the prototype getter with a data property
return this.startXRef = startXRef;
return shadow(this, "startXRef", startXRef);
},
get mainXRefEntriesOffset() {
var mainXRefEntriesOffset = 0;
@ -1971,7 +1976,7 @@ var PDFDoc = (function() {
if (linearization)
mainXRefEntriesOffset = linearization.mainXRefEntriesOffset;
// shadow the prototype getter with a data property
return this.mainXRefEntriesOffset = mainXRefEntriesOffset;
return shadow(this, "mainXRefEntriesOffset", mainXRefEntriesOffset);
},
// Find the header, remove leading garbage and setup the stream
// starting from the header.

9
test.html
View File

@ -29,15 +29,18 @@ function load() {
req = new XMLHttpRequest();
req.open("GET", "uncompressed.tracemonkey-pldi-09.pdf");
req.mozResponseType = "arraybuffer";
req.expected = 0; // 200 for HTTP
req.mozResponseType = req.responseType = "arraybuffer";
req.expected = (document.URL.indexOf("file:") == 0) ? 0 : 200;
req.onreadystatechange = xhrstate;
req.send(null);
}
function xhrstate() {
if (req.readyState == 4 && req.status == req.expected) {
var data = req.mozResponseArrayBuffer || req.mozResponse;
var data = req.mozResponseArrayBuffer ||
req.mozResponse ||
req.responseArrayBuffer ||
req.response;
pdf = new PDFDoc(new Stream(data));
numPages = pdf.numPages;
displayPage(1);