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oaistruct.go
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oaistruct.go
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// Turn OAI XML stream into a simple JSON format.
//
// Previous snippets: https://archive.org/download/oai_harvest_20220921 (compat.py)
package main
import (
"bufio"
"bytes"
"encoding/xml"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
)
var debug = flag.Bool("d", false, "debug output")
// Record was generated 2023-07-07 16:31:12 by tir on reka.
type Record struct {
XMLName xml.Name `xml:"record"`
Text string `xml:",chardata"`
Xmlns string `xml:"xmlns,attr"`
Header struct {
Text string `xml:",chardata"`
Status string `xml:"status,attr"`
Identifier string `xml:"identifier"`
Datestamp string `xml:"datestamp"`
SetSpec []string `xml:"setSpec"`
} `xml:"header"`
Metadata struct {
Text string `xml:",chardata"`
Dc struct {
Text string `xml:",chardata"`
OaiDc string `xml:"oai_dc,attr"`
Dc string `xml:"dc,attr"`
Xsi string `xml:"xsi,attr"`
SchemaLocation string `xml:"schemaLocation,attr"`
Doc string `xml:"doc,attr"`
Title []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"title"`
Creator []string `xml:"creator"`
Subject []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"subject"`
Description []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"description"`
Publisher []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"publisher"`
Contributor []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"contributor"`
Date []string `xml:"date"`
Type []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"type"`
Format []string `xml:"format"`
Identifier []string `xml:"identifier"`
Source []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"source"`
Language string `xml:"language"`
Relation []string `xml:"relation"`
Rights []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"rights"`
Coverage []struct {
Text string `xml:",chardata"`
Lang string `xml:"lang,attr"`
} `xml:"coverage"`
} `xml:"dc"`
} `xml:"metadata"`
About string `xml:"about"`
}
type TagSplitter struct {
Tag string
started bool
buf bytes.Buffer
}
func Suffixes(s string) (suffixes []string) {
if len(s) < 2 {
return
}
for i := 1; i < len(s)-1; i++ {
suffixes = append(suffixes, s[i:])
}
return
}
func (s *TagSplitter) SplitFunc(data []byte, atEOF bool) (advance int, token []byte, err error) {
if len(data) == 0 || atEOF {
return 0, nil, nil
}
if !s.started {
idx := bytes.Index(data, []byte("<"+s.Tag))
if idx == -1 {
// Check for possible suffixes, then advance a bit less
for _, s := range Suffixes("<" + s.Tag) {
if bytes.HasSuffix(data, []byte(s)) {
return len(data) - len(s), nil, nil
}
}
return len(data), nil, nil
}
s.started = true
s.buf.Reset()
s.buf.Write(data[idx : idx+len(s.Tag)])
return len(data[:idx+len(s.Tag)]), nil, nil
} else {
idx := bytes.Index(data, []byte("</"+s.Tag+">"))
if idx == -1 {
// Check for possible suffixes, then advance a bit less
for _, k := range Suffixes("</" + s.Tag + ">") {
if bytes.HasSuffix(data, []byte(k)) {
s.buf.Write(data[:len(data)-len(k)])
return len(data) - len(k), nil, nil
}
}
s.buf.Write(data)
return len(data), nil, nil
}
s.started = false
s.buf.Write(data[:idx+9])
token = s.buf.Bytes()
return len(data[:idx+9]), token, nil
}
}
func TruncateSnippet(s string) string {
if len(s) < 120 {
return strings.Replace(s, "\n", " ", -1)
}
return fmt.Sprintf("% 10d", len(s)) + " " + strings.Replace(s[:50], "\n", "", -1) + "..." + strings.Replace(s[len(s)-50:], "\n", "", -1)
}
func main() {
flag.Parse()
bw := bufio.NewWriter(os.Stdout)
defer bw.Flush()
ts := &TagSplitter{Tag: "record"}
scanner := bufio.NewScanner(os.Stdin)
scanner.Split(ts.SplitFunc)
for scanner.Scan() {
s := scanner.Text()
if *debug {
log.Println(TruncateSnippet(s))
} else {
io.WriteString(bw, s)
}
}
if scanner.Err() != nil {
log.Fatal(scanner.Err())
}
}