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Reduce the overall indentation level in Catalog_readDocumentOutline, by using early returns, in order to improve readability

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This commit is contained in:
Jonas Jenwald 2016-02-13 23:13:01 +01:00
parent e9a1a47d28
commit 98db068079
2 changed files with 70 additions and 56 deletions
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113
src/core/obj.js
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@ -128,66 +128,67 @@ var Catalog = (function CatalogClosure() {
return shadow(this, 'documentOutline', obj);
},
readDocumentOutline: function Catalog_readDocumentOutline() {
var xref = this.xref;
var obj = this.catDict.get('Outlines');
if (!isDict(obj)) {
return null;
}
obj = obj.getRaw('First');
if (!isRef(obj)) {
return null;
}
var root = { items: [] };
if (isDict(obj)) {
obj = obj.getRaw('First');
var processed = new RefSet();
if (isRef(obj)) {
var queue = [{obj: obj, parent: root}];
// to avoid recursion keeping track of the items
// in the processed dictionary
processed.put(obj);
while (queue.length > 0) {
var i = queue.shift();
var outlineDict = xref.fetchIfRef(i.obj);
if (outlineDict === null) {
continue;
}
if (!outlineDict.has('Title')) {
error('Invalid outline item');
}
var actionDict = outlineDict.get('A'), dest = null, url = null;
if (actionDict) {
var destEntry = actionDict.get('D');
if (destEntry) {
dest = destEntry;
} else {
var uriEntry = actionDict.get('URI');
if (isString(uriEntry) && isValidUrl(uriEntry, false)) {
url = uriEntry;
}
}
} else if (outlineDict.has('Dest')) {
dest = outlineDict.getRaw('Dest');
if (isName(dest)) {
dest = dest.name;
}
}
var title = outlineDict.get('Title');
var outlineItem = {
dest: dest,
url: url,
title: stringToPDFString(title),
color: outlineDict.get('C') || [0, 0, 0],
count: outlineDict.get('Count'),
bold: !!(outlineDict.get('F') & 2),
italic: !!(outlineDict.get('F') & 1),
items: []
};
i.parent.items.push(outlineItem);
obj = outlineDict.getRaw('First');
if (isRef(obj) && !processed.has(obj)) {
queue.push({obj: obj, parent: outlineItem});
processed.put(obj);
}
obj = outlineDict.getRaw('Next');
if (isRef(obj) && !processed.has(obj)) {
queue.push({obj: obj, parent: i.parent});
processed.put(obj);
var queue = [{obj: obj, parent: root}];
// To avoid recursion, keep track of the already processed items.
var processed = new RefSet();
processed.put(obj);
var xref = this.xref;
while (queue.length > 0) {
var i = queue.shift();
var outlineDict = xref.fetchIfRef(i.obj);
if (outlineDict === null) {
continue;
}
assert(outlineDict.has('Title'), 'Invalid outline item');
var actionDict = outlineDict.get('A'), dest = null, url = null;
if (actionDict) {
var destEntry = actionDict.get('D');
if (destEntry) {
dest = destEntry;
} else {
var uriEntry = actionDict.get('URI');
if (isString(uriEntry) && isValidUrl(uriEntry, false)) {
url = uriEntry;
}
}
} else if (outlineDict.has('Dest')) {
dest = outlineDict.getRaw('Dest');
if (isName(dest)) {
dest = dest.name;
}
}
var title = outlineDict.get('Title');
var outlineItem = {
dest: dest,
url: url,
title: stringToPDFString(title),
color: outlineDict.get('C') || [0, 0, 0],
count: outlineDict.get('Count'),
bold: !!(outlineDict.get('F') & 2),
italic: !!(outlineDict.get('F') & 1),
items: []
};
i.parent.items.push(outlineItem);
obj = outlineDict.getRaw('First');
if (isRef(obj) && !processed.has(obj)) {
queue.push({obj: obj, parent: outlineItem});
processed.put(obj);
}
obj = outlineDict.getRaw('Next');
if (isRef(obj) && !processed.has(obj)) {
queue.push({obj: obj, parent: i.parent});
processed.put(obj);
}
}
return (root.items.length > 0 ? root.items : null);