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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package groovy.xml
import groovy.xml.streamingmarkupsupport.AbstractStreamingBuilder
import groovy.xml.streamingmarkupsupport.BaseMarkupBuilder
import org.xml.sax.helpers.AttributesImpl
import org.xml.sax.ext.LexicalHandler
class StreamingSAXBuilder extends AbstractStreamingBuilder {
def pendingStack = []
def commentClosure = {doc, pendingNamespaces, namespaces, namespaceSpecificTags, prefix, attrs, body, contentHandler ->
if (contentHandler instanceof LexicalHandler) {
contentHandler.comment(body.toCharArray(), 0, body.size())
}
}
def piClosure = {doc, pendingNamespaces, namespaces, namespaceSpecificTags, prefix, attrs, body, contentHandler ->
attrs.each {target, instruction ->
if (instruction instanceof Map) {
def buf = new StringBuffer()
instruction.each {name, value ->
if (value.toString().contains('"'))
buf.append(" $name='$value'")
else
buf.append(" $name=\"$value\"")
}
contentHandler.processingInstruction(target, buf.toString())
} else {
contentHandler.processingInstruction(target, instruction)
}
}
}
def noopClosure = {doc, pendingNamespaces, namespaces, namespaceSpecificTags, prefix, attrs, body, contentHandler ->
if (body != null) {
processBody(body, doc, contentHandler)
}
}
def tagClosure = {tag, doc, pendingNamespaces, namespaces, namespaceSpecificTags, prefix, attrs, body, contentHandler ->
def attributes = new AttributesImpl()
attrs.each {key, value ->
addAttributes(attributes, key, value, namespaces)
}
def hiddenNamespaces = [:]
pendingNamespaces.each {key, value ->
def k = (key == ':' ? '' : key)
hiddenNamespaces[k] = namespaces[key]
namespaces[k] = value
attributes.addAttribute("http://www.w3.org/2000/xmlns/", k, "xmlns${k == '' ? '' : ":$k"}", "CDATA", "$value")
contentHandler.startPrefixMapping(k, value)
}
// set up the tag info
def uri = ""
def qualifiedName = tag
if (prefix != "") {
if (namespaces.containsKey(prefix)) {
uri = namespaces[prefix]
} else if (pendingNamespaces.containsKey(prefix)) {
uri = pendingNamespaces[prefix]
} else {
throw new GroovyRuntimeException("Namespace prefix: ${prefix} is not bound to a URI")
}
if (prefix != ":") {
qualifiedName = prefix + ":" + tag
}
}
contentHandler.startElement(uri, tag, qualifiedName, attributes)
if (body != null) {
pendingStack.add pendingNamespaces.clone()
pendingNamespaces.clear()
processBody(body, doc, contentHandler)
pendingNamespaces.clear()
pendingNamespaces.putAll pendingStack.pop()
}
contentHandler.endElement(uri, tag, qualifiedName)
hiddenNamespaces.each {key, value ->
contentHandler.endPrefixMapping(key)
if (value == null)
namespaces.remove key
else
namespaces[key] = value
}
}
private addAttributes(AttributesImpl attributes, key, value, namespaces) {
if (key.contains('$')) {
def parts = key.tokenize('$')
if (namespaces.containsKey(parts[0])) {
def namespaceUri = namespaces[parts[0]]
attributes.addAttribute(namespaceUri, parts[1], "${parts[0]}:${parts[1]}", "CDATA", "$value")
} else {
throw new GroovyRuntimeException("bad attribute namespace tag in ${key}")
}
} else {
attributes.addAttribute("", key, key, "CDATA", "$value")
}
}
private processBody(body, doc, contentHandler) {
if (body instanceof Closure) {
def body1 = body.clone()
body1.delegate = doc
body1(doc)
} else if (body instanceof Buildable) {
body.build(doc)
} else {
body.each {
processBodyPart(it, doc, contentHandler)
}
}
}
private processBodyPart(part, doc, contentHandler) {
if (part instanceof Closure) {
def body1 = part.clone()
body1.delegate = doc
body1(doc)
} else if (part instanceof Buildable) {
part.build(doc)
} else {
def chars = part.toCharArray()
contentHandler.characters(chars, 0, chars.size())
}
}
def builder = null
StreamingSAXBuilder() {
specialTags.putAll(['yield': noopClosure,
'yieldUnescaped': noopClosure,
'comment': commentClosure,
'pi': piClosure])
def nsSpecificTags = [':': [tagClosure, tagClosure, [:]], // the default namespace
'http://www.w3.org/XML/1998/namespace': [tagClosure, tagClosure, [:]],
'http://www.codehaus.org/Groovy/markup/keywords': [badTagClosure, tagClosure, specialTags]]
this.builder = new BaseMarkupBuilder(nsSpecificTags)
}
public bind(closure) {
def boundClosure = this.builder.bind(closure)
return {contentHandler ->
contentHandler.startDocument()
boundClosure.trigger = contentHandler
contentHandler.endDocument()
}
}
}