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134
src/main/java/org/segrada/rendering/markdown/PageMarkdownRenderer.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,134 @@ | ||
| package org.segrada.rendering.markdown; | ||
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| import com.vladsch.flexmark.ast.Image; | ||
| import com.vladsch.flexmark.ast.Link; | ||
| import com.vladsch.flexmark.html.HtmlRenderer; | ||
| import com.vladsch.flexmark.html.HtmlRenderer.Builder; | ||
| import com.vladsch.flexmark.html.HtmlRenderer.HtmlRendererExtension; | ||
| import com.vladsch.flexmark.html.LinkResolver; | ||
| import com.vladsch.flexmark.html.LinkResolverFactory; | ||
| import com.vladsch.flexmark.html.renderer.LinkResolverBasicContext; | ||
| import com.vladsch.flexmark.html.renderer.LinkStatus; | ||
| import com.vladsch.flexmark.html.renderer.ResolvedLink; | ||
| import com.vladsch.flexmark.parser.Parser; | ||
| import com.vladsch.flexmark.util.ast.Node; | ||
| import com.vladsch.flexmark.util.data.DataHolder; | ||
| import com.vladsch.flexmark.util.data.MutableDataHolder; | ||
| import com.vladsch.flexmark.util.data.MutableDataSet; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.jetbrains.annotations.Nullable; | ||
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| import java.util.Collections; | ||
| import java.util.Set; | ||
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| public class PageMarkdownRenderer { | ||
| // markdown data holder with custom extension + more extensions defined below | ||
| final private static DataHolder OPTIONS = new MutableDataSet() | ||
| .set(Parser.EXTENSIONS, Collections.singletonList(CustomExtension.create())).toImmutable(); | ||
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| // markdown parser and renderer | ||
| static final Parser PARSER = Parser.builder(OPTIONS).build(); | ||
| static final HtmlRenderer RENDERER = HtmlRenderer.builder(OPTIONS).build(); | ||
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| // context path | ||
| static private String contextPath; | ||
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| public static class PageLinkResolver implements LinkResolver { | ||
| @Override | ||
| public @NotNull ResolvedLink resolveLink(@NotNull Node node, @NotNull LinkResolverBasicContext linkResolverBasicContext, @NotNull ResolvedLink link) { | ||
| // Links | ||
| if (node instanceof Link) { | ||
| String url = link.getUrl(); | ||
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| // external link | ||
| if (url.startsWith("http")) {// add external class | ||
| link.getMutableAttributes().addValue("class", "sg-link-external"); | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url); | ||
| } | ||
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| // add context path to url | ||
| url = PageMarkdownRenderer.contextPath + "/page/" + url; | ||
| // cut away .md suffix if needed | ||
| if (url.endsWith(".md")) url = url.substring(0, url.length() - 3); | ||
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| link.getMutableAttributes().addValue("class", "sg-data-add"); | ||
| if (link.getTitle() == null || link.getTitle().equals("")) { | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url).withTitle(((Link) node).getText()); | ||
| } | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url); | ||
| } | ||
|
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| // Images | ||
| if (node instanceof Image) { | ||
| String url = link.getUrl(); | ||
|
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| // do not change links starting with http | ||
| if (url.startsWith("http")) | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url); | ||
|
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| // add context path to url | ||
| url = PageMarkdownRenderer.contextPath + "/page/img/" + url; | ||
| // cut away .png suffix if needed | ||
| if (url.endsWith(".png")) url = url.substring(0, url.length() - 4); | ||
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| if (link.getTitle() == null || link.getTitle().equals("")) { | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url).withTitle(((Image) node).getTitle()); | ||
| } | ||
| return link.withStatus(LinkStatus.VALID).withUrl(url); | ||
| } | ||
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| return link; | ||
| } | ||
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| public static class Factory implements LinkResolverFactory { | ||
| @Override | ||
| public @Nullable Set<Class<?>> getAfterDependents() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public @Nullable Set<Class<?>> getBeforeDependents() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public boolean affectsGlobalScope() { | ||
| return false; | ||
| } | ||
|
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| @Override | ||
| public @NotNull LinkResolver apply(@NotNull LinkResolverBasicContext context) { | ||
| return new PageLinkResolver(); | ||
| } | ||
| } | ||
| } | ||
|
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| static class CustomExtension implements HtmlRendererExtension { | ||
| @Override | ||
| public void rendererOptions(@NotNull MutableDataHolder options) { | ||
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| } | ||
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| @Override | ||
| public void extend(@NotNull Builder htmlRendererBuilder, @NotNull String rendererType) { | ||
| htmlRendererBuilder.linkResolverFactory(new PageLinkResolver.Factory()); | ||
| } | ||
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| static CustomExtension create() { | ||
| return new CustomExtension(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * renders markdown to HTML | ||
| * | ||
| * @param markdown source | ||
| * @param contextPath source | ||
| * @return html | ||
| */ | ||
| public static String render(String markdown, String contextPath) { | ||
| PageMarkdownRenderer.contextPath = contextPath; | ||
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| return RENDERER.render(PARSER.parse(markdown)); | ||
| } | ||
| } |