forked from phpdave11/gofpdi
/
exporter.go
81 lines (69 loc) · 1.87 KB
/
exporter.go
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package gofpdi
import (
"fmt"
"github.com/tim-timpani/gofpdi/text"
"io"
"os"
)
const (
PlainTextFileFormat = "plain text"
)
type Exporter struct {
sourceFileName string
reader *PdfReader
}
func NewExporter(sourceFileName string) (*Exporter, error) {
reader, err := NewPdfReader(sourceFileName)
if err != nil {
return nil, err
}
if reader.pageCount < 1 {
return nil, fmt.Errorf("file '%s' has no pages", sourceFileName)
}
return &Exporter{
sourceFileName: sourceFileName,
reader: reader,
}, nil
}
// GetPagePlainText returns the plain text from a given page. Page numbers start with 1 in the PDF world
func (e *Exporter) GetPagePlainText(pageNumber int) (string, error) {
_, text, err := e.getTextShowOperations(pageNumber)
return text, err
}
func (e *Exporter) ExportToPlainTextFile(fileName string) error {
outFile, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer outFile.Close()
outBuffer := io.StringWriter(outFile)
for pageNumber := 1; pageNumber <= e.reader.pageCount; pageNumber++ {
pageText, err := e.GetPagePlainText(pageNumber)
if err != nil {
return err
}
outBuffer.WriteString(pageText)
}
return nil
}
func (e *Exporter) getTextShowOperations(pageNumber int) (map[int]map[float64]*text.ShowOperation, string, error) {
// Get all the text blocks from the page contents
blocks, err := e.reader.getPageTextBlocks(pageNumber)
if err != nil {
return nil, "", err
}
// Get all fonts used on this page
pageFonts, err := e.reader.getFontDefinitions(pageNumber)
if err != nil {
return nil, "", err
}
// Create a page object
page := text.NewPageRender(pageNumber, pageFonts)
// Add the text blocks to the page object
for _, block := range blocks {
if err := page.AddTextBlock(block); err != nil {
return nil, "", err
}
}
return page.GetIndexedShowOps()
}