| /* |
| * Copyright 2017 The Bazel Authors. All rights reserved. |
| * |
| * Licensed 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 com.google.idea.blaze.base.lang.projectview.documentation; |
| |
| import com.google.idea.blaze.base.lang.buildfile.psi.util.PsiUtils; |
| import com.google.idea.blaze.base.lang.projectview.psi.ProjectViewSection; |
| import com.google.idea.blaze.base.projectview.section.SectionParser; |
| import com.google.idea.blaze.base.settings.Blaze; |
| import com.intellij.lang.documentation.AbstractDocumentationProvider; |
| import com.intellij.lang.documentation.ExternalDocumentationProvider; |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiFile; |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.List; |
| import javax.annotation.Nullable; |
| import org.apache.commons.httpclient.HttpClient; |
| import org.apache.commons.httpclient.methods.HeadMethod; |
| import org.apache.commons.httpclient.params.HttpConnectionManagerParams; |
| |
| /** Provides quick docs for some .blazeproject elements. */ |
| public class ProjectViewDocumentationProvider extends AbstractDocumentationProvider |
| implements ExternalDocumentationProvider { |
| |
| @Nullable |
| private static SectionParser getSection(PsiElement element) { |
| ProjectViewSection section = PsiUtils.getParentOfType(element, ProjectViewSection.class, false); |
| return section != null ? section.getSectionParser() : null; |
| } |
| |
| @Nullable |
| @Override |
| public String generateDoc(PsiElement element, @Nullable PsiElement originalElement) { |
| SectionParser section = getSection(element); |
| if (section == null) { |
| return null; |
| } |
| StringBuilder builder = new StringBuilder(); |
| String quickDocs = section.quickDocs(); |
| if (quickDocs != null) { |
| builder.append(wrapInTag("<p>" + section.quickDocs(), "code")); |
| } |
| String url = getUrlFor(element.getProject(), section, false); |
| if (url != null) { |
| builder.append( |
| String.format("<p><b>External documentation</b>:<br><a href=\"%s\">%s</a>", url, url)); |
| } |
| return wrapInTag(wrapInTag(builder.toString(), "body"), "html"); |
| } |
| |
| private static String wrapInTag(String doc, String htmlTag) { |
| return String.format("<%s>%s</%s>", htmlTag, doc, htmlTag); |
| } |
| |
| @Override |
| public boolean hasDocumentationFor(PsiElement element, PsiElement originalElement) { |
| return getUrlFor(element, false) != null; |
| } |
| |
| @Override |
| public List<String> getUrlFor(PsiElement element, PsiElement originalElement) { |
| final String url = getUrlFor(element, true); |
| return url == null ? null : Collections.singletonList(url); |
| } |
| |
| @Nullable |
| @Override |
| public String fetchExternalDocumentation( |
| Project project, PsiElement element, List<String> docUrls) { |
| return null; |
| } |
| |
| @Override |
| public boolean canPromptToConfigureDocumentation(PsiElement element) { |
| return false; |
| } |
| |
| @Override |
| public void promptToConfigureDocumentation(PsiElement element) {} |
| |
| @Nullable |
| private static String getUrlFor(PsiElement element, boolean checkExistence) { |
| SectionParser section = getSection(element); |
| return section != null ? getUrlFor(element.getProject(), section, checkExistence) : null; |
| } |
| |
| @Nullable |
| private static String getUrlFor(Project project, SectionParser section, boolean checkExistence) { |
| String baseDocsUrl = Blaze.getBuildSystemProvider(project).getProjectViewDocumentationUrl(); |
| if (baseDocsUrl == null) { |
| return null; |
| } |
| String url = baseDocsUrl + "#" + section.getName(); |
| if (checkExistence && !pageExists(url)) { |
| return baseDocsUrl; |
| } |
| return url; |
| } |
| |
| private static boolean pageExists(String url) { |
| final HttpClient client = new HttpClient(); |
| final HttpConnectionManagerParams params = client.getHttpConnectionManager().getParams(); |
| params.setSoTimeout(5 * 1000); |
| params.setConnectionTimeout(5 * 1000); |
| |
| try { |
| final HeadMethod method = new HeadMethod(url); |
| final int rc = client.executeMethod(method); |
| if (rc == 404) { |
| return false; |
| } |
| } catch (IllegalArgumentException e) { |
| return false; |
| } catch (IOException e) { |
| // ignore |
| } |
| return true; |
| } |
| |
| @Nullable |
| @Override |
| public PsiElement getCustomDocumentationElement( |
| Editor editor, PsiFile file, @Nullable PsiElement contextElement) { |
| return PsiUtils.getParentOfType(contextElement, ProjectViewSection.class, false); |
| } |
| } |