Java Code Examples for com.google.javascript.rhino.Node#getLineno()

/**
 * Starts the source mapping for the given
 * node at the current position.
 */
@Override
void startSourceMapping(Node node) {
  Preconditions.checkState(sourceMapDetailLevel != null);
  Preconditions.checkState(node != null);
  if (createSrcMap
      && node.getSourceFileName() != null
      && node.getLineno() > 0
      && sourceMapDetailLevel.apply(node)) {
    int line = getCurrentLineIndex();
    int index = getCurrentCharIndex();
    Preconditions.checkState(line >= 0);
    Mapping mapping = new Mapping();
    mapping.node = node;
    mapping.start = new FilePosition(line, index);
    mappings.push(mapping);
    allMappings.add(mapping);
  }
}
 

/**
 * Rewrite the function declaration from:
 *   function x() {}
 *   FUNCTION
 *     NAME
 *     LP
 *     BLOCK
 * to:
 *   var x = function() {};
 *   VAR
 *     NAME
 *       FUNCTION
 *         NAME (w/ empty string)
 *         LP
 *         BLOCK
 */
private void rewriteFunctionDeclaration(Node n) {
  // Prepare a spot for the function.
  Node oldNameNode = n.getFirstChild();
  Node fnNameNode = oldNameNode.cloneNode();
  Node var = new Node(Token.VAR, fnNameNode, n.getLineno(), n.getCharno());
  var.copyInformationFrom(n);

  // Prepare the function
  oldNameNode.setString("");

  // Move the function
  Node parent = n.getParent();
  parent.replaceChild(n, var);
  fnNameNode.addChildToFront(n);

  reportCodeChange("Function declaration");
}
 

private Node transform(AstNode node) {
  JSDocInfo jsDocInfo = handleJsDoc(node);
  Node irNode = justTransform(node);
  if (jsDocInfo != null) {
    irNode.setJSDocInfo(jsDocInfo);
  }

  // If we have a named function, set the position to that of the name.
  if (irNode.getType() == Token.FUNCTION &&
      irNode.getFirstChild().getLineno() != -1) {
    irNode.setLineno(irNode.getFirstChild().getLineno());
    irNode.setCharno(irNode.getFirstChild().getCharno());
  } else {
    if (irNode.getLineno() == -1) {
      // If we didn't already set the line, then set it now.  This avoids
      // cases like ParenthesizedExpression where we just return a previous
      // node, but don't want the new node to get its parent's line number.
      int lineno = node.getLineno();
      irNode.setLineno(lineno);
      int charno = position2charno(node.getAbsolutePosition());
      irNode.setCharno(charno);
    }
  }
  return irNode;
}
 

/**
 * Split a var node such as:
 *   var a, b;
 * into individual statements:
 *   var a;
 *   var b;
 * @param n The whose children we should inspect.
 */
private void splitVarDeclarations(Node n) {
  for (Node next, c = n.getFirstChild(); c != null; c = next) {
    next = c.getNext();
    if (c.getType() == Token.VAR) {
      if (assertOnChange && !c.hasChildren()) {
        throw new IllegalStateException("Empty VAR node.");
      }

      while (c.getFirstChild() != c.getLastChild()) {
        Node name = c.getFirstChild();
        c.removeChild(name);
        Node newVar = new Node(
            Token.VAR, name, n.getLineno(), n.getCharno());
        n.addChildBefore(newVar, c);
        reportCodeChange("VAR with multiple children");
      }
    }
  }
}
 

private SourcePosition<AliasTransformation> getSourceRegion(Node n) {
  Node testNode = n;
  Node next = null;
  for (; next != null || testNode.isScript();) {
    next = testNode.getNext();
    testNode = testNode.getParent();
  }

  int endLine = next == null ? Integer.MAX_VALUE : next.getLineno();
  int endChar = next == null ? Integer.MAX_VALUE : next.getCharno();
  SourcePosition<AliasTransformation> pos =
      new SourcePosition<AliasTransformation>() {};
  pos.setPositionInformation(
      n.getLineno(), n.getCharno(), endLine, endChar);
  return pos;
}
 

private SourcePosition<AliasTransformation> getSourceRegion(Node n) {
  Node testNode = n;
  Node next = null;
  for (; next != null || testNode.isScript();) {
    next = testNode.getNext();
    testNode = testNode.getParent();
  }

  int endLine = next == null ? Integer.MAX_VALUE : next.getLineno();
  int endChar = next == null ? Integer.MAX_VALUE : next.getCharno();
  SourcePosition<AliasTransformation> pos =
      new SourcePosition<AliasTransformation>() {};
  pos.setPositionInformation(
      n.getLineno(), n.getCharno(), endLine, endChar);
  return pos;
}
 

/**
 * Rewrite the function declaration from:
 *   function x() {}
 *   FUNCTION
 *     NAME
 *     LP
 *     BLOCK
 * to:
 *   var x = function() {};
 *   VAR
 *     NAME
 *       FUNCTION
 *         NAME (w/ empty string)
 *         LP
 *         BLOCK
 */
private void rewriteFunctionDeclaration(Node n) {
  // Prepare a spot for the function.
  Node oldNameNode = n.getFirstChild();
  Node fnNameNode = oldNameNode.cloneNode();
  Node var = new Node(Token.VAR, fnNameNode, n.getLineno(), n.getCharno());
  var.copyInformationFrom(n);

  // Prepare the function
  oldNameNode.setString("");

  // Move the function
  Node parent = n.getParent();
  parent.replaceChild(n, var);
  fnNameNode.addChildToFront(n);

  reportCodeChange("Function declaration");
}
 

private SourcePosition<AliasTransformation> getSourceRegion(Node n) {
  Node testNode = n;
  Node next = null;
  for (; next != null || testNode.isScript();) {
    next = testNode.getNext();
    testNode = testNode.getParent();
  }

  int endLine = next == null ? Integer.MAX_VALUE : next.getLineno();
  int endChar = next == null ? Integer.MAX_VALUE : next.getCharno();
  SourcePosition<AliasTransformation> pos =
      new SourcePosition<AliasTransformation>() {};
  pos.setPositionInformation(
      n.getLineno(), n.getCharno(), endLine, endChar);
  return pos;
}
 

/**
 * Visits a NEW node.
 */
private void visitNew(NodeTraversal t, Node n) {
  Node constructor = n.getFirstChild();
  FunctionType type = getFunctionType(constructor);
  if (type != null && type.isConstructor()) {
    visitParameterList(t, n, type);
    ensureTyped(t, n, type.getInstanceType());
  } else {
    // TODO(user): add support for namespaced objects.
    if (constructor.getType() != Token.GETPROP) {
      // TODO(user): make the constructor node have lineno/charno
      // and use constructor for a more precise error indication.
      // It seems that GETPROP nodes are missing this information.
      Node line;
      if (constructor.getLineno() < 0 || constructor.getCharno() < 0) {
        line = n;
      } else {
        line = constructor;
      }
      report(t, line, NOT_A_CONSTRUCTOR);
    }
    ensureTyped(t, n);
  }
}
 

/**
 * Visits a NEW node.
 */
private void visitNew(NodeTraversal t, Node n) {
  Node constructor = n.getFirstChild();
  FunctionType type = getFunctionType(constructor);
  if (type != null && type.isConstructor()) {
    visitParameterList(t, n, type);
    ensureTyped(t, n, type.getInstanceType());
  } else {
    // TODO(user): add support for namespaced objects.
    if (constructor.getType() != Token.GETPROP) {
      // TODO(user): make the constructor node have lineno/charno
      // and use constructor for a more precise error indication.
      // It seems that GETPROP nodes are missing this information.
      Node line;
      if (constructor.getLineno() < 0 || constructor.getCharno() < 0) {
        line = n;
      } else {
        line = constructor;
      }
      report(t, line, NOT_A_CONSTRUCTOR);
    }
    ensureTyped(t, n);
  }
}
 

private String formatNodePosition(Node n) {
  String sourceFileName = getBestSourceFileName(n);
  if (sourceFileName == null) {
    return MISSING_SOURCE + "\n";
  }

  int lineNumber = n.getLineno();
  int columnNumber = n.getCharno();
  String src = compiler.getSourceLine(sourceFileName, lineNumber);
  if (src == null) {
    src = MISSING_SOURCE;
  }
  return sourceFileName + ":" + lineNumber + ":" + columnNumber + "\n"
      + src + "\n";
}
 

String getIdForGeneratorNode(boolean consistent, Node n) {
  Preconditions.checkState(n.isString());
  if (consistent) {
    return n.getString();
  } else {
    return n.getSourceFileName() + ':' + n.getLineno() + ":" + n.getCharno();
  }
}
 

public void addMapping(
    Node node,
    FilePosition outputStartPosition,
    FilePosition outputEndPosition) {
  String sourceFile = node.getSourceFileName();

  // If the node does not have an associated source file or
  // its line number is -1, then the node does not have sufficient
  // information for a mapping to be useful.
  if (sourceFile == null || node.getLineno() < 0) {
    return;
  }

  sourceFile = fixupSourceLocation(sourceFile);

  String originalName = (String) node.getProp(Node.ORIGINALNAME_PROP);

  // Strangely, Rhino source lines are one based but columns are
  // zero based.
  // We don't change this for the v1 or v2 source maps but for
  // v3 we make them both 0 based.
  int lineBaseOffset = 1;
  if (generator instanceof SourceMapGeneratorV1
      || generator instanceof SourceMapGeneratorV2) {
    lineBaseOffset = 0;
  }

  generator.addMapping(
      sourceFile, originalName,
      new FilePosition(node.getLineno() - lineBaseOffset, node.getCharno()),
      outputStartPosition, outputEndPosition);
}
 

@Override
public void visit(NodeTraversal t, Node n, Node parent) {
  if (n.isScript()) {
    requiresLineNumbers = false;
  } else if (requiresLineNumbers) {
    if (n.getLineno() == -1) {
      // The tree version of the node is really the best diagnostic
      // info we have to offer here.
      compiler.report(
          t.makeError(n, MISSING_LINE_INFO,
              n.toStringTree()));
    }
  }
}
 

private void setSourceInfo(Node irNode, AstNode node) {
  if (irNode.getLineno() == -1) {
    // If we didn't already set the line, then set it now. This avoids
    // cases like ParenthesizedExpression where we just return a previous
    // node, but don't want the new node to get its parent's line number.
    int lineno = node.getLineno();
    irNode.setLineno(lineno);
    int charno = position2charno(node.getAbsolutePosition());
    irNode.setCharno(charno);
    maybeSetLengthFrom(irNode, node);
  }
}
 

private void setSourceInfo(Node irNode, AstNode node) {
  if (irNode.getLineno() == -1) {
    // If we didn't already set the line, then set it now. This avoids
    // cases like ParenthesizedExpression where we just return a previous
    // node, but don't want the new node to get its parent's line number.
    int lineno = node.getLineno();
    irNode.setLineno(lineno);
    int charno = position2charno(node.getAbsolutePosition());
    irNode.setCharno(charno);
    maybeSetLengthFrom(irNode, node);
  }
}
 

/**
 * Creates a JSError for a source file location.  Private to avoid
 * any entanglement with code outside of the compiler.
 */
private JSError(String sourceName, @Nullable Node node,
                DiagnosticType type, String... arguments) {
  this(sourceName,
       node,
       (node != null) ? node.getLineno() : -1,
       (node != null) ? node.getCharno() : -1,
       type, null, arguments);
}
 

@Override
public String toString() {
  Node n = getRootNode();
  if (n != null) {
    return "Scope@" + n.getSourceFileName() + ":" + n.getLineno();
  } else {
    return "PropertyScope@" + getSymbolForScope();
  }
}
 

public void addMapping(
    Node node,
    FilePosition outputStartPosition,
    FilePosition outputEndPosition) {
  String sourceFile = node.getSourceFileName();

  // If the node does not have an associated source file or
  // its line number is -1, then the node does not have sufficient
  // information for a mapping to be useful.
  if (sourceFile == null || node.getLineno() < 0) {
    return;
  }

  sourceFile = fixupSourceLocation(sourceFile);

  String originalName = (String) node.getProp(Node.ORIGINALNAME_PROP);

  // Strangely, Rhino source lines are one based but columns are
  // zero based.
  // We don't change this for the v1 or v2 source maps but for
  // v3 we make them both 0 based.
  int lineBaseOffset = 1;
  if (generator instanceof SourceMapGeneratorV1
      || generator instanceof SourceMapGeneratorV2) {
    lineBaseOffset = 0;
  }

  generator.addMapping(
      sourceFile, originalName,
      new FilePosition(node.getLineno() - lineBaseOffset, node.getCharno()),
      outputStartPosition, outputEndPosition);
}
 

/**
 * Gets the current line number, or zero if it cannot be determined. The line
 * number is retrieved lazily as a running time optimization.
 */
public int getLineNumber() {
  Node cur = curNode;
  while (cur != null) {
    int line = cur.getLineno();
    if (line >=0) {
      return line;
    }
    cur = cur.getParent();
  }
  return 0;
}