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Structure tree parsing

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Jakub Melka
2020-07-18 19:46:42 +02:00
parent a21f185e89
commit 0a62ad618d
7 changed files with 399 additions and 17 deletions
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18
PdfForQtLib/sources/pdfnumbertreeloader.h
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@ -37,12 +37,12 @@ public:
/// Parses the number tree and loads its items into the array. Some errors are ignored,
/// e.g. when kid is null. Type must contain methods to load object array.
static Objects parse(const PDFDocument* document, const PDFObject& root)
static Objects parse(const PDFObjectStorage* storage, const PDFObject& root)
{
Objects result;
// First, try to load items from the tree into the array
parseImpl(result, document, root);
parseImpl(result, storage, root);
// Array may not be sorted. Sort it using comparison operator for Type.
std::stable_sort(result.begin(), result.end());
@ -51,12 +51,12 @@ public:
}
private:
static void parseImpl(Objects& objects, const PDFDocument* document, const PDFObject& root)
static void parseImpl(Objects& objects, const PDFObjectStorage* storage, const PDFObject& root)
{
if (const PDFDictionary* dictionary = document->getDictionaryFromObject(root))
if (const PDFDictionary* dictionary = storage->getDictionaryFromObject(root))
{
// First, load the objects into the array
const PDFObject& numberedItems = document->getObject(dictionary->get("Nums"));
const PDFObject& numberedItems = storage->getObject(dictionary->get("Nums"));
if (numberedItems.isArray())
{
const PDFArray* numberedItemsArray = numberedItems.getArray();
@ -67,25 +67,25 @@ private:
const size_t numberIndex = 2 * i;
const size_t valueIndex = 2 * i + 1;
const PDFObject& number = document->getObject(numberedItemsArray->getItem(numberIndex));
const PDFObject& number = storage->getObject(numberedItemsArray->getItem(numberIndex));
if (!number.isInt())
{
continue;
}
objects.emplace_back(Type::parse(number.getInteger(), document, numberedItemsArray->getItem(valueIndex)));
objects.emplace_back(Type::parse(number.getInteger(), storage, numberedItemsArray->getItem(valueIndex)));
}
}
// Then, follow the kids
const PDFObject& kids = document->getObject(dictionary->get("Kids"));
const PDFObject& kids = storage->getObject(dictionary->get("Kids"));
if (kids.isArray())
{
const PDFArray* kidsArray = kids.getArray();
const size_t count = kidsArray->getCount();
for (size_t i = 0; i < count; ++i)
{
parseImpl(objects, document, kidsArray->getItem(i));
parseImpl(objects, storage, kidsArray->getItem(i));
}
}
}