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Extract parseHtmlParts method to InterpolationParser
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| enablePlugins(Example) | ||
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| libraryDependencies += "org.scalatest" %%% "scalatest" % "3.2.11" % Test | ||
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| libraryDependencies += "net.sourceforge.htmlunit" % "neko-htmlunit" % "2.58.0" |
243 changes: 243 additions & 0 deletions
243
...InterpolationParser/src/main/scala/com/thoughworks/binding/html/InterpolationParser.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,243 @@ | ||
| package com.thoughtworks.binding.html | ||
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| import net.sourceforge.htmlunit.cyberneko.HTMLConfiguration | ||
| import net.sourceforge.htmlunit.cyberneko.HTMLEventInfo | ||
| import net.sourceforge.htmlunit.cyberneko.parsers.DOMFragmentParser | ||
| import org.apache.xerces.util.XMLAttributesImpl | ||
| import org.apache.xerces.xni.Augmentations | ||
| import org.apache.xerces.xni.QName | ||
| import org.apache.xerces.xni.XMLAttributes | ||
| import org.apache.xerces.xni.XMLString | ||
| import org.apache.xerces.xni.parser.XMLInputSource | ||
| import org.w3c.dom.Node | ||
| import org.xml.sax.InputSource | ||
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| import java.io.StringReader | ||
| import scala.collection.Searching | ||
| import scala.collection.immutable.BitSet | ||
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| object InterpolationParser: | ||
| private val AUGMENTATIONS = "http://cyberneko.org/html/features/augmentations" | ||
| private val SYNTHESIZED_ITEM = HTMLEventInfo.SynthesizedItem() | ||
| private val Placeholder = "\"\"" | ||
| val ElementArgumentUserDataKey = "Binding.scala element argument" | ||
| val AttributeArgumentsUserDataKey = "Binding.scala attribute arguments" | ||
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| private def consumedArgumentIndices(node: Node): BitSet = | ||
| val nodeList = node.getChildNodes | ||
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| (0 until nodeList.getLength).view | ||
| .flatMap(i => consumedArgumentIndices(nodeList.item(i))) | ||
| .to(BitSet) | ||
| ++ (node.getUserData(ElementArgumentUserDataKey) match | ||
| case null => | ||
| BitSet.empty | ||
| case arg: Int => | ||
| BitSet(arg) | ||
| ) ++ (node.getUserData(AttributeArgumentsUserDataKey) match | ||
| case null => | ||
| BitSet.empty | ||
| case args: Map[_, Int @unchecked] => | ||
| args.values.to(BitSet) | ||
| ) | ||
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| def parseHtmlParts( | ||
| parts: IndexedSeq[String], | ||
| argumentErrorHandler: (message: String, argumentIndex: Int) => Unit | ||
| ) = | ||
| val parser = new InterpolationParser(parts, argumentErrorHandler) | ||
| val document = org.apache.html.dom.HTMLDocumentImpl() | ||
| val fragment = document.createDocumentFragment() | ||
| val html = parts.mkString(Placeholder) | ||
| parser.parse(InputSource(StringReader(html)), fragment) | ||
| val isConsumed = this.consumedArgumentIndices(fragment) | ||
| for | ||
| argIndex <- parts.indices.dropRight(1) | ||
| if !isConsumed(argIndex) | ||
| do | ||
| argumentErrorHandler( | ||
| "A variable must be either an attribute value or child nodes under an element", | ||
| argIndex | ||
| ) | ||
| end for | ||
| fragment | ||
| end parseHtmlParts | ||
| end InterpolationParser | ||
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| private class InterpolationParser( | ||
| parts: IndexedSeq[String], | ||
| argumentErrorHandler: (message: String, argumentIndex: Int) => Unit | ||
| ) extends DOMFragmentParser: | ||
| import InterpolationParser.* | ||
| private val html = parts.mkString(Placeholder) | ||
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| private val partOffsets = parts.view | ||
| .flatMap { part => | ||
| Seq(part.length, Placeholder.length) | ||
| } | ||
| .scanLeft(0)(_ + _) | ||
| .dropRight(1) | ||
| .toIndexedSeq | ||
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| fParserConfiguration | ||
| .asInstanceOf[HTMLConfiguration] | ||
| .setFeature(AUGMENTATIONS, true); | ||
| override def startElement( | ||
| element: QName, | ||
| attrs: XMLAttributes, | ||
| augs: Augmentations | ||
| ): Unit = | ||
| val dynamicAttributeIndices = | ||
| (0 until attrs.getLength).view | ||
| .collect(Function.unlift { i => | ||
| val htmlEventInfo = attrs | ||
| .getAugmentations(i) | ||
| .getItem(AUGMENTATIONS) | ||
| .asInstanceOf[HTMLEventInfo] | ||
| val beginCharacterOffset = htmlEventInfo.getBeginCharacterOffset | ||
| val endCharacterOffset = htmlEventInfo.getEndCharacterOffset | ||
| val beginSearchResult = | ||
| partOffsets.search(beginCharacterOffset) | ||
| val endSearchResult = | ||
| partOffsets.search(endCharacterOffset) | ||
| val beginIndex = beginSearchResult.insertionPoint | ||
| val endIndex = endSearchResult.insertionPoint | ||
| if beginIndex % 2 == 1 && endIndex == beginIndex + 1 then | ||
| Some(i -> (beginIndex / 2)) | ||
| else None | ||
| }) | ||
| .toMap | ||
| val staticAttributes = XMLAttributesImpl() | ||
| for i <- 0 until attrs.getLength do | ||
| if !dynamicAttributeIndices.contains(i) then | ||
| val qName = QName() | ||
| attrs.getName(i, /* out */ qName) | ||
| staticAttributes.addAttribute( | ||
| qName, | ||
| attrs.getType(i), | ||
| attrs.getValue(i) | ||
| ) | ||
| end if | ||
| end for | ||
| super.startElement(element, staticAttributes, augs) | ||
| fCurrentNode.setUserData( | ||
| AttributeArgumentsUserDataKey, | ||
| for (i, arg) <- dynamicAttributeIndices yield | ||
| if attrs.getValue(i) != "" then | ||
| argumentErrorHandler( | ||
| "String interpolation must be the whole attribute value, not a part of the attribute value.", | ||
| arg | ||
| ) | ||
| end if | ||
| val qName = QName() | ||
| attrs.getName(i, /* out */ qName) | ||
| qName -> arg | ||
| , | ||
| null | ||
| ) | ||
| private var isProcessingCharacters = false | ||
| override def characters(text: XMLString, augs: Augmentations): Unit = | ||
| if isProcessingCharacters then super.characters(text, augs) | ||
| else | ||
| isProcessingCharacters = true | ||
| try | ||
| if augs == null then super.characters(text, augs) | ||
| else | ||
| val htmlEventInfo = | ||
| augs.getItem(AUGMENTATIONS).asInstanceOf[HTMLEventInfo] | ||
| val beginCharacterOffset = htmlEventInfo.getBeginCharacterOffset | ||
| val endCharacterOffset = htmlEventInfo.getEndCharacterOffset | ||
| val beginSearchResult = | ||
| partOffsets.search(beginCharacterOffset) | ||
| val endSearchResult = | ||
| partOffsets.search(endCharacterOffset) | ||
| val beginIndex = beginSearchResult.insertionPoint | ||
| val endIndex = endSearchResult.insertionPoint | ||
| if beginIndex == endIndex || (beginIndex % 2 == 0 && endIndex == beginIndex + 1) | ||
| then super.characters(text, augs) | ||
| else | ||
| def partLoop(index: Int): Unit = | ||
| assert(index % 2 == 0) | ||
| endSearchResult match | ||
| case Searching.InsertionPoint(`endIndex`) | ||
| if endIndex == index + 1 => | ||
| fParserConfiguration | ||
| .asInstanceOf[HTMLConfiguration] | ||
| .evaluateInputSource( | ||
| XMLInputSource( | ||
| null, | ||
| null, | ||
| null, | ||
| StringReader( | ||
| html.substring( | ||
| partOffsets(index), | ||
| endCharacterOffset | ||
| ) | ||
| ), | ||
| null | ||
| ) | ||
| ) | ||
| case _ => | ||
| fParserConfiguration | ||
| .asInstanceOf[HTMLConfiguration] | ||
| .evaluateInputSource( | ||
| XMLInputSource( | ||
| null, | ||
| null, | ||
| null, | ||
| StringReader( | ||
| parts(index / 2) | ||
| ), | ||
| null | ||
| ) | ||
| ) | ||
| argLoop(index + 1) | ||
| end match | ||
| end partLoop | ||
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| def argLoop(index: Int): Unit = | ||
| assert(index % 2 == 1) | ||
| if endIndex > index then | ||
| val comment = fDocument.createComment("") | ||
| comment.setUserData( | ||
| ElementArgumentUserDataKey, | ||
| index / 2, | ||
| null | ||
| ) | ||
| fCurrentNode.appendChild(comment) | ||
| partLoop(index + 1) | ||
| end if | ||
| end argLoop | ||
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| beginSearchResult match | ||
| case Searching.InsertionPoint(`beginIndex`) | ||
| if beginIndex % 2 == 1 => | ||
| fParserConfiguration | ||
| .asInstanceOf[HTMLConfiguration] | ||
| .evaluateInputSource( | ||
| XMLInputSource( | ||
| null, | ||
| null, | ||
| null, | ||
| StringReader( | ||
| html.substring( | ||
| beginCharacterOffset, | ||
| partOffsets(beginIndex) | ||
| ) | ||
| ), | ||
| null | ||
| ) | ||
| ) | ||
| argLoop(beginIndex) | ||
| case Searching.Found(`beginIndex`) if beginIndex % 2 == 1 => | ||
| argLoop(beginIndex) | ||
| case Searching.Found(`beginIndex`) if beginIndex % 2 == 0 => | ||
| partLoop(beginIndex) | ||
| case _ => | ||
| argumentErrorHandler(s"Unexpected text: $text", beginIndex / 2) | ||
| end match | ||
| end if | ||
| end if | ||
| finally isProcessingCharacters = false | ||
| end characters | ||
| end InterpolationParser |
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