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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.jetbrains.python.validation;

import com.intellij.lang.annotation.Annotation;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.module.ModuleUtilCore;
import com.intellij.openapi.util.TextRange;
import com.jetbrains.python.PyNames;
import com.jetbrains.python.documentation.*;
import com.jetbrains.python.highlighting.PyHighlighter;
import com.jetbrains.python.psi.*;

/**
 * Highlights doc strings in classes, functions, and files.
 */
public class DocStringAnnotator extends PyAnnotator {

  @Override
  public void visitPyFile(final PyFile node) {
    annotateDocStringStmt(DocStringUtil.findDocStringExpression(node));
  }

  @Override
  public void visitPyFunction(final PyFunction node) {
    annotateDocStringStmt(DocStringUtil.findDocStringExpression(node.getStatementList()));
  }

  @Override
  public void visitPyClass(final PyClass node) {
    annotateDocStringStmt(DocStringUtil.findDocStringExpression(node.getStatementList()));
  }

  @Override
  public void visitPyAssignmentStatement(PyAssignmentStatement node) {
    if (node.isAssignmentTo(PyNames.DOC)) {
      PyExpression right = node.getAssignedValue();
      if (right instanceof PyStringLiteralExpression) {
        Annotation ann = getHolder().createInfoAnnotation(right, null);
        ann.setTextAttributes(PyHighlighter.PY_DOC_COMMENT);
        annotateDocStringStmt((PyStringLiteralExpression)right);
      }
    }
  }

  @Override
  public void visitPyExpressionStatement(PyExpressionStatement node) {
    if (node.getExpression() instanceof PyStringLiteralExpression &&
        DocStringUtil.isVariableDocString((PyStringLiteralExpression)node.getExpression())) {
      annotateDocStringStmt((PyStringLiteralExpression)node.getExpression());
    }
  }

  private void annotateDocStringStmt(final PyStringLiteralExpression stmt) {
    if (stmt != null) {
      final Module module = ModuleUtilCore.findModuleForPsiElement(stmt);
      if (module == null) return;
      final PyDocumentationSettings settings = PyDocumentationSettings.getInstance(module);
      if (!settings.isPlain(stmt.getContainingFile())) {
        String[] tags = settings.isEpydocFormat(stmt.getContainingFile()) ? EpydocString.ALL_TAGS : SphinxDocString.ALL_TAGS;
        int pos = 0;
        while(true) {
          TextRange textRange = DocStringReferenceProvider.findNextTag(stmt.getText(), pos, tags);
          if (textRange == null) break;
          Annotation annotation = getHolder().createInfoAnnotation(textRange.shiftRight(stmt.getTextRange().getStartOffset()), null);
          annotation.setTextAttributes(PyHighlighter.PY_DOC_COMMENT_TAG);
          pos = textRange.getEndOffset();
        }
      }
    }
  }
}