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// Copyright 2012-2018 Charles Banning. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file
// x2m_bulk.go: Process files with multiple XML messages.
package x2j
import (
"bytes"
"io"
"os"
"regexp"
"github.com/clbanning/mxj"
)
// XmlMsgsFromFile()
// 'fname' is name of file
// 'phandler' is the map processing handler. Return of 'false' stops further processing.
// 'ehandler' is the parsing error handler. Return of 'false' stops further processing and returns error.
// Note: phandler() and ehandler() calls are blocking, so reading and processing of messages is serialized.
// This means that you can stop reading the file on error or after processing a particular message.
// To have reading and handling run concurrently, pass arguments to a go routine in handler and return true.
func XmlMsgsFromFile(fname string, phandler func(map[string]interface{})(bool), ehandler func(error)(bool), recast ...bool) error {
var r bool
if len(recast) == 1 {
r = recast[0]
}
fi, fierr := os.Stat(fname)
if fierr != nil {
return fierr
}
fh, fherr := os.Open(fname)
if fherr != nil {
return fherr
}
defer fh.Close()
buf := make([]byte,fi.Size())
_, rerr := fh.Read(buf)
if rerr != nil {
return rerr
}
doc := string(buf)
// xml.Decoder doesn't properly handle whitespace in some doc
// see songTextString.xml test case ...
reg,_ := regexp.Compile("[ \t\n\r]*<")
doc = reg.ReplaceAllString(doc,"<")
b := bytes.NewBufferString(doc)
for {
m, merr := mxj.NewMapXmlReader(b,r)
if merr != nil && merr != io.EOF {
if ok := ehandler(merr); !ok {
// caused reader termination
return merr
}
}
if m != nil {
if ok := phandler(m); !ok {
break
}
}
if merr == io.EOF {
break
}
}
return nil
}
// XmlBufferToMap - process XML message from a bytes.Buffer
// 'b' is the buffer
// Optional argument 'recast' coerces map values to float64 or bool where possible.
func XmlBufferToMap(b *bytes.Buffer,recast ...bool) (map[string]interface{},error) {
var r bool
if len(recast) == 1 {
r = recast[0]
}
return mxj.NewMapXmlReader(b, r)
}
// ============================= io.Reader version for stream processing ======================
// XmlMsgsFromReader() - io.Reader version of XmlMsgsFromFile
// 'rdr' is an io.Reader for an XML message (stream)
// 'phandler' is the map processing handler. Return of 'false' stops further processing.
// 'ehandler' is the parsing error handler. Return of 'false' stops further processing and returns error.
// Note: phandler() and ehandler() calls are blocking, so reading and processing of messages is serialized.
// This means that you can stop reading the file on error or after processing a particular message.
// To have reading and handling run concurrently, pass arguments to a go routine in handler and return true.
func XmlMsgsFromReader(rdr io.Reader, phandler func(map[string]interface{})(bool), ehandler func(error)(bool), recast ...bool) error {
var r bool
if len(recast) == 1 {
r = recast[0]
}
for {
m, merr := ToMap(rdr,r)
if merr != nil && merr != io.EOF {
if ok := ehandler(merr); !ok {
// caused reader termination
return merr
}
}
if m != nil {
if ok := phandler(m); !ok {
break
}
}
if merr == io.EOF {
break
}
}
return nil
}
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