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templatexml.go
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templatexml.go
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package main
import (
"bytes"
"fmt"
)
const (
templateXML = "xml"
payloadXMLAttribute = "attribute"
payloadXMLCdata = "cdata"
payloadXMLComment = "comment"
payloadXMLElement = "element"
payloadXMLValue = "value"
contentTypeXML = "text/xml; charset=UTF-8"
errUnsupportedXMLType = "Column: %s has unsupported XML type: %s"
)
type TemplateXMLPayload struct {
PrettyPrint bool `json:"pretty_print"`
PrettyPrintTabs bool `json:"pretty_print_tabs"`
PrettyPrintSpacesCount int `json:"pretty_print_spaces_count"`
}
type TemplateXML struct {
schema Schema
payload TemplateXMLPayload
}
func (template TemplateXML) Generate(chunk *Chunk) ([]byte, error) {
generated, err := template.generate(template.schema.columns, chunk)
return generated, err
}
func (template TemplateXML) ContentType() string {
return contentTypeXML
}
func (template TemplateXML) generate(columns []TypedColumn, chunk *Chunk) ([]byte, error) {
var buffer bytes.Buffer
if columns != nil {
for _, column := range columns {
xmlType := column.Payload().XmlType()
if len(xmlType) == 0 {
xmlType = payloadXMLElement
}
switch xmlType {
case payloadXMLElement:
buffer.WriteString(template.getIndent(chunk))
buffer.WriteByte('<')
buffer.WriteString(column.Column().name)
nestedColumns := column.Column().columns
if nestedColumns != nil && len(nestedColumns) > 0 {
// iterate nested attributes only
for _, nestedColumn := range nestedColumns {
if nestedColumn.Payload().XmlType() == payloadXMLAttribute {
val, err := generateValue(chunk, template.schema.emptyValue, nestedColumn)
if err != nil {
return nil, err
}
buffer.WriteByte(' ')
buffer.WriteString(nestedColumn.Column().name)
buffer.WriteString("=\"")
buffer.WriteString(val)
buffer.WriteByte('"')
}
}
buffer.WriteByte('>')
// iterate nested nodes
generated, err := template.generate(nestedColumns, &Chunk{
from: chunk.from,
to: chunk.to,
values: make(map[string]string),
parent: chunk,
})
if err != nil {
return nil, err
}
buffer.Write(generated)
// val, err := column.Value(chunk)
// if err != nil {
// return "", err
// }
// chunk.values[column.Column().name] = val
// buffer.WriteString(val)
buffer.WriteString("</")
buffer.WriteString(column.Column().name)
buffer.WriteByte('>')
buffer.WriteByte('\n')
} else {
buffer.WriteString("/>")
buffer.WriteByte('\n')
}
case payloadXMLAttribute:
// already covered in the default case => nothing to do here
case payloadXMLValue:
val, err := generateValue(chunk, template.schema.emptyValue, column)
if err != nil {
return nil, err
}
buffer.WriteString(val)
case payloadXMLCdata:
val, err := generateValue(chunk, template.schema.emptyValue, column)
if err != nil {
return nil, err
}
buffer.WriteByte('\n')
buffer.WriteString("<![CDATA[\n")
buffer.WriteString(val)
buffer.WriteString("\n]]>\n")
case payloadXMLComment:
val, err := generateValue(chunk, template.schema.emptyValue, column)
if err != nil {
return nil, err
}
buffer.WriteByte('\n')
buffer.WriteString(template.getIndent(chunk))
buffer.WriteString("<!--")
buffer.WriteString(val)
buffer.WriteString("-->")
buffer.WriteByte('\n')
default:
return nil, fmt.Errorf(errUnsupportedXMLType, column.Column().name, xmlType)
}
}
}
return buffer.Bytes(), nil
}
func (template TemplateXML) getIndent(chunk *Chunk) string {
if !template.payload.PrettyPrint {
return ""
}
var buffer bytes.Buffer
if chunk.parent != nil {
buffer.WriteByte('\n')
}
for currentChunk := chunk; currentChunk.parent != nil; currentChunk = currentChunk.parent {
if !template.payload.PrettyPrintTabs {
spacesCount := template.payload.PrettyPrintSpacesCount
if spacesCount == 0 {
spacesCount = 4
}
for j := 0; j < spacesCount; j++ {
buffer.WriteByte(' ')
}
} else {
buffer.WriteByte('\t')
}
}
return buffer.String()
}