wrm.libsass.ClasspathAwareImporter Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of libsass-maven-plugin Show documentation
Libsass plugin for maven
There is a newer version: 0.3.1
package wrm.libsass;

import static wrm.libsass.Lookups.findLocalFile;
import static wrm.libsass.Lookups.findResource;
import static wrm.libsass.Lookups.findWebJarResource;

import io.bit3.jsass.importer.Import;
import io.bit3.jsass.importer.Importer;
import java.net.URI;
import java.util.Collection;
import java.util.Collections;
import java.util.Optional;
import java.util.stream.Stream;



class ClasspathAwareImporter implements Importer {
  private static final String SCSS_EXT = ".scss";
  private static final String CSS_EXT = ".css";

  private final WebJarTranslator webJarTranslator = new WebJarTranslator();

  @Override
  public Collection apply(String importStr, Import previous) {
    URI base = previous.getAbsoluteUri();
    URI uri = buildUri(importStr);
    Optional uriCss = tryBuildUriCss(importStr);

    Stream lookups = Stream.of(() -> findLocalFile(base, addUnderscore(uri)),
        () -> findLocalFile(base, uri),
        () -> uriCss.map(u -> findLocalFile(base, u)).orElse(Optional.empty()),
        () -> findResource(addUnderscore(uri)), () -> findResource(uri),
        () -> uriCss.map(Lookups::findResource).orElse(Optional.empty()),
        () -> findResource(addUnderscore(base.resolve(uri))), () -> findResource(base.resolve(uri)),
        () -> uriCss.map(u -> findResource(base.resolve(u))).orElse(Optional.empty()),
        () -> findWebJarResource(addUnderscore(uri), webJarTranslator),
        () -> findWebJarResource(uri, webJarTranslator),
        () -> uriCss.map(u -> findWebJarResource(u, webJarTranslator)).orElse(Optional.empty()));
    Optional lookupResult = lookups.map(Lookup::run)
        .filter(Optional::isPresent).map(Optional::get)
        .findFirst();
    return lookupResult.map(r -> r.buildImport(importStr))
        .map(Collections::singletonList).orElse(null);
  }

  private static URI buildUri(String importStr) {
    String withExtension = importStr.endsWith(SCSS_EXT) ? importStr : importStr + SCSS_EXT;
    return URI.create(withExtension);
  }

  private static Optional tryBuildUriCss(String importStr) {
    return importStr.endsWith(SCSS_EXT) ? Optional.empty() : Optional
        .of(URI.create(importStr + CSS_EXT));
  }

  private static URI addUnderscore(URI source) {
    String sourceStr = source.toString();
    int afterLastSlash = sourceStr.lastIndexOf("/") + 1;
    String withUnderscore = new StringBuilder(sourceStr).insert(afterLastSlash, "_").toString();
    return URI.create(withUnderscore);
  }
}