unipdf/extractor/extractor.go
2019-05-16 20:44:51 +00:00

53 lines
1.6 KiB
Go

/*
* This file is subject to the terms and conditions defined in
* file 'LICENSE.md', which is part of this source code package.
*/
package extractor
import (
"github.com/unidoc/unipdf/v3/model"
)
// Extractor stores and offers functionality for extracting content from PDF pages.
type Extractor struct {
// stream contents and resources for page
contents string
resources *model.PdfPageResources
// fontCache is a simple LRU cache that is used to prevent redundant constructions of PdfFont's from
// PDF objects. NOTE: This is not a conventional glyph cache. It only caches PdfFont's.
fontCache map[string]fontEntry
// text results from running extractXYText on forms within the page.
// TODO(peterwilliams): Cache this map accross all pages in a PDF to speed up processig.
formResults map[string]textResult
// accessCount is used to set fontEntry.access to an incrementing number.
accessCount int64
// textCount is an incrementing number used to identify XYTest objects.
textCount int64
}
// New returns an Extractor instance for extracting content from the input PDF page.
func New(page *model.PdfPage) (*Extractor, error) {
contents, err := page.GetAllContentStreams()
if err != nil {
return nil, err
}
// Uncomment these lines to see the contents of the page. For debugging.
// fmt.Println("========================= +++ =========================")
// fmt.Printf("%s\n", contents)
// fmt.Println("========================= ::: =========================")
e := &Extractor{
contents: contents,
resources: page.Resources,
fontCache: map[string]fontEntry{},
formResults: map[string]textResult{},
}
return e, nil
}