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Remove unnecessary whitespace from HTML output
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src/main/java/de/perdian/flightlog/support/thymeleaf/FlightlogThymeleafDialect.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| package de.perdian.flightlog.support.thymeleaf; | ||
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| import org.apache.commons.lang3.StringUtils; | ||
| import org.springframework.stereotype.Component; | ||
| import org.thymeleaf.dialect.IPostProcessorDialect; | ||
| import org.thymeleaf.engine.AbstractTemplateHandler; | ||
| import org.thymeleaf.model.ICloseElementTag; | ||
| import org.thymeleaf.model.IOpenElementTag; | ||
| import org.thymeleaf.model.IText; | ||
| import org.thymeleaf.postprocessor.IPostProcessor; | ||
| import org.thymeleaf.postprocessor.PostProcessor; | ||
| import org.thymeleaf.templatemode.TemplateMode; | ||
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| import java.util.LinkedList; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.Set; | ||
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| @Component | ||
| public class FlightlogThymeleafDialect implements IPostProcessorDialect { | ||
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| @Override | ||
| public int getDialectPostProcessorPrecedence() { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public String getName() { | ||
| return "flightlog"; | ||
| } | ||
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| @Override | ||
| public Set<IPostProcessor> getPostProcessors() { | ||
| return Set.of( | ||
| new PostProcessor(TemplateMode.HTML, RemoveWhitespacesTemplateHandler.class, 0) | ||
| ); | ||
| } | ||
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| public static class RemoveWhitespacesTemplateHandler extends AbstractTemplateHandler { | ||
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| private List<ElementInfo> elementStack = new LinkedList<>(); | ||
| private List<String> ignoreElementNames = List.of("html", "head", "body", "span", "pre"); | ||
| private List<String> trimElementNames = List.of("a", "button"); | ||
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| @Override | ||
| public void handleOpenElement(IOpenElementTag openElementTag) { | ||
| ElementInfo newElementInfo = new ElementInfo(openElementTag.getElementDefinition().getElementName().getElementName().toLowerCase()); | ||
| ElementInfo currentElementInfo = this.getElementStack().isEmpty() ? null : this.getElementStack().getLast(); | ||
| if (currentElementInfo != null) { | ||
| currentElementInfo.addChild(newElementInfo); | ||
| } | ||
| this.getElementStack().addLast(newElementInfo); | ||
| super.handleOpenElement(openElementTag); | ||
| } | ||
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| @Override | ||
| public void handleCloseElement(ICloseElementTag closeElementTag) { | ||
| if (!this.getElementStack().isEmpty()) { | ||
| this.getElementStack().removeLast(); | ||
| } | ||
| super.handleCloseElement(closeElementTag); | ||
| } | ||
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| @Override | ||
| public void handleText(IText text) { | ||
| ElementInfo currentElementInfo = this.getElementStack().isEmpty() ? null : this.getElementStack().getLast(); | ||
| if (currentElementInfo == null || this.getIgnoreElementNames().contains(currentElementInfo.getElementName())) { | ||
| super.handleText(text); | ||
| } else { | ||
| String currentTextValue = text.getText(); | ||
| if (StringUtils.isBlank(currentTextValue)) { | ||
| // Ignore | ||
| } else { | ||
| String reducedTextValue = this.reduceString(currentTextValue, currentElementInfo); | ||
| if (!Objects.equals(currentTextValue, reducedTextValue)) { | ||
| super.handleText(this.getContext().getModelFactory().createText(reducedTextValue)); | ||
| } else { | ||
| super.handleText(text); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| private String reduceString(String inputString, ElementInfo elementInfo) { | ||
| if (this.getTrimElementNames().contains(elementInfo.getElementName())) { | ||
| if (!elementInfo.getChildren().isEmpty()) { | ||
| return inputString; | ||
| } else { | ||
| return inputString.strip(); | ||
| } | ||
| } else { | ||
| return inputString; | ||
| } | ||
| } | ||
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| List<ElementInfo> getElementStack() { | ||
| return this.elementStack; | ||
| } | ||
| void setElementStack(List<ElementInfo> elementStack) { | ||
| this.elementStack = elementStack; | ||
| } | ||
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| List<String> getIgnoreElementNames() { | ||
| return this.ignoreElementNames; | ||
| } | ||
| void setIgnoreElementNames(List<String> ignoreElementNames) { | ||
| this.ignoreElementNames = ignoreElementNames; | ||
| } | ||
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| List<String> getTrimElementNames() { | ||
| return this.trimElementNames; | ||
| } | ||
| void setTrimElementNames(List<String> trimElementNames) { | ||
| this.trimElementNames = trimElementNames; | ||
| } | ||
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| static class ElementInfo { | ||
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| private String elementName = null; | ||
| private boolean nonWhitespaceTextAdded = false; | ||
| private List<ElementInfo> children = new LinkedList<>(); | ||
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| private ElementInfo(String elementName) { | ||
| this.setElementName(elementName); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return this.getElementName(); | ||
| } | ||
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| String getElementName() { | ||
| return this.elementName; | ||
| } | ||
| private void setElementName(String elementName) { | ||
| this.elementName = elementName; | ||
| } | ||
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| boolean isNonWhitespaceTextAdded() { | ||
| return this.nonWhitespaceTextAdded; | ||
| } | ||
| void setNonWhitespaceTextAdded(boolean nonWhitespaceTextAdded) { | ||
| this.nonWhitespaceTextAdded = nonWhitespaceTextAdded; | ||
| } | ||
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| void addChild(ElementInfo child) { | ||
| this.getChildren().add(child); | ||
| } | ||
| List<ElementInfo> getChildren() { | ||
| return this.children; | ||
| } | ||
| void setChildren(List<ElementInfo> children) { | ||
| this.children = children; | ||
| } | ||
|
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| } | ||
|
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| } | ||
|
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| } |
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