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package hocr
// TODO: Parse line name to zero pad line numbers, so they can
// be sorted easily
// TODO: have same filename format as .prob uses, so include base
// dirname, and don't include line numbers if there's only
// one line in the hocr
import (
"encoding/xml"
"image"
"image/png"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"git.rescribe.xyz/testingtools/parse"
)
type Hocr struct {
Lines []OcrLine `xml:"body>div>div>p>span"`
}
type OcrLine struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Words []OcrWord `xml:"span"`
Text string `xml:",chardata"`
}
type OcrWord struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Chars []OcrChar `xml:"span"`
Text string `xml:",chardata"`
}
type OcrChar struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Chars []OcrChar `xml:"span"`
Text string `xml:",chardata"`
}
// Returns the confidence for a word based on its x_wconf value
func wordConf(s string) (float64, error) {
re, err := regexp.Compile(`x_wconf ([0-9.]+)`)
if err != nil {
return 0.0, err
}
conf := re.FindStringSubmatch(s)
return strconv.ParseFloat(conf[1], 64)
}
func boxCoords(s string) ([4]int, error) {
var coords [4]int
re, err := regexp.Compile(`bbox ([0-9]+) ([0-9]+) ([0-9]+) ([0-9]+)`)
if err != nil {
return coords, err
}
coordstr := re.FindStringSubmatch(s)
for i := range coords {
c, err := strconv.Atoi(coordstr[i+1])
if err != nil {
return coords, err
}
coords[i] = c
}
return coords, nil
}
func noText(s string) bool {
t := strings.Trim(s, " \n")
return len(t) == 0
}
func Parse(b []byte) (Hocr, error) {
var hocr Hocr
err := xml.Unmarshal(b, &hocr)
if err != nil {
return hocr, err
}
return hocr, nil
}
func parseLineDetails(h Hocr, i image.Image, name string) (parse.LineDetails, error) {
lines := make(parse.LineDetails, 0)
for _, l := range h.Lines {
totalconf := float64(0)
num := 0
for _, w := range l.Words {
c, err := wordConf(w.Title)
if err != nil {
return lines, err
}
num++
totalconf += c
}
coords, err := boxCoords(l.Title)
if err != nil {
return lines, err
}
var line parse.LineDetail
line.Name = l.Id
line.Avgconf = (totalconf/float64(num)) / 100
linetext := ""
linetext = l.Text
if(noText(linetext)) {
linetext = ""
for _, w := range l.Words {
if(w.Class != "ocrx_word") {
continue
}
linetext += w.Text + " "
}
}
if(noText(linetext)) {
linetext = ""
for _, w := range l.Words {
if(w.Class != "ocrx_word") {
continue
}
for _, c := range w.Chars {
if(c.Class != "ocrx_cinfo") {
continue
}
linetext += c.Text
}
linetext += " "
}
}
line.Text = strings.TrimRight(linetext, " ")
line.Text += "\n"
line.OcrName = name
var imgd parse.ImgDirect
imgd.Img = i.(*image.Gray).SubImage(image.Rect(coords[0], coords[1], coords[2], coords[3]))
line.Img = imgd
lines = append(lines, line)
}
return lines, nil
}
func GetLineDetails(hocrfn string) (parse.LineDetails, error) {
var newlines parse.LineDetails
file, err := ioutil.ReadFile(hocrfn)
if err != nil {
return newlines, err
}
h, err := Parse(file)
if err != nil {
return newlines, err
}
pngfn := strings.Replace(hocrfn, ".hocr", ".png", 1)
pngf, err := os.Open(pngfn)
if err != nil {
return newlines, err
}
defer pngf.Close()
img, err := png.Decode(pngf)
if err != nil {
return newlines, err
}
n := strings.Replace(filepath.Base(hocrfn), ".hocr", "", 1)
return parseLineDetails(h, img, n)
}
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