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42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package extractor
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import "github.com/unidoc/unidoc/pdf/model"
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// Extractor stores and offers functionality for extracting content from PDF pages.
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type Extractor struct {
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contents string
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resources *model.PdfPageResources
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// fontCache is a simple LRU cache that is used to prevent redundant constructions of PdfFont's from
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// PDF objects. NOTE: This is not a conventional glyph cache. It only caches PdfFont's.
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fontCache map[string]fontEntry
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// accessCount is used to set fontEntry.access to an incrementing number.
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accessCount int64
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}
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// New returns an Extractor instance for extracting content from the input PDF page.
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func New(page *model.PdfPage) (*Extractor, error) {
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contents, err := page.GetAllContentStreams()
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if err != nil {
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return nil, err
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}
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// Uncomment these lines to see the contents of the page. For debugging.
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// fmt.Println("========================= +++ =========================")
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// fmt.Printf("%s\n", contents)
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// fmt.Println("========================= ::: =========================")
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e := &Extractor{
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contents: contents,
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resources: page.Resources,
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fontCache: map[string]fontEntry{},
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}
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return e, nil
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}
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