/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"
#include "nsIClipboard.idl"
#include "domstubs.idl"

%{C++
#include "mozilla/Debug.h"
%}

interface nsISelectionController;
interface nsIDocumentStateListener;
interface nsIEditActionListener;
interface nsIInlineSpellChecker;
interface nsITransferable;

webidl Document;
webidl Element;
webidl Node;
webidl Selection;

%{C++
namespace mozilla {
class EditorBase;
class HTMLEditor;
class TextEditor;
} // namespace mozilla
%}

[scriptable, builtinclass, uuid(094be624-f0bf-400f-89e2-6a84baab9474)]
interface nsIEditor  : nsISupports
{
%{C++
  typedef short EDirection;
  typedef short EStripWrappers;
%}
  const short eNone = 0;
  const short eNext = 1;
  const short ePrevious = 2;
  const short eNextWord = 3;
  const short ePreviousWord = 4;
  const short eToBeginningOfLine = 5;
  const short eToEndOfLine = 6;

%{C++
  static bool EDirectionIsValid(EDirection aDirectionAndAmount) {
    return aDirectionAndAmount == nsIEditor::eNone ||
           aDirectionAndAmount == nsIEditor::eNext ||
           aDirectionAndAmount == nsIEditor::ePrevious ||
           aDirectionAndAmount == nsIEditor::eNextWord ||
           aDirectionAndAmount == nsIEditor::ePreviousWord ||
           aDirectionAndAmount == nsIEditor::eToBeginningOfLine ||
           aDirectionAndAmount == nsIEditor::eToEndOfLine;
  }
  static bool EDirectionIsValidExceptNone(EDirection aDirectionAndAmount) {
    return aDirectionAndAmount != nsIEditor::eNone &&
           EDirectionIsValid(aDirectionAndAmount);
  }

  /**
   * Return true if nsIEditor::EDirection value means the direction of pressing
   * `Backspace` key.
   */
  [[nodiscard]] static bool DirectionIsBackspace(
    EDirection aDirectionAndAmount) {
    MOZ_ASSERT(EDirectionIsValid(aDirectionAndAmount));
    return aDirectionAndAmount == nsIEditor::ePrevious ||
           aDirectionAndAmount == nsIEditor::ePreviousWord ||
           aDirectionAndAmount == nsIEditor::eToBeginningOfLine;
  }

  /**
   * Return true if nsIEditor::EDirection value means the direction of pressing
   * `Delete` key (forwardDelete).
   */
  [[nodiscard]] static bool DirectionIsDelete(
    EDirection aDirectionAndAmount) {
    MOZ_ASSERT(EDirectionIsValid(aDirectionAndAmount));
    return aDirectionAndAmount == nsIEditor::eNext ||
           aDirectionAndAmount == nsIEditor::eNextWord ||
           aDirectionAndAmount == nsIEditor::eToEndOfLine;
  }
%}

  const short eStrip = 0;
  const short eNoStrip = 1;

  // If you want an HTML editor to behave as a plaintext editor, specify this
  // flag.  This is currently used only with plaintext email composer.
  const long eEditorPlaintextMask       = 0x0001;
  // We don't support single line editor mode with HTML editors.  Therefore,
  // don't specify this for HTML editor.
  const long eEditorSingleLineMask      = 0x0002;
  // We don't support password editor mode with HTML editors.  Therefore,
  // don't specify this for HTML editor.
  const long eEditorPasswordMask        = 0x0004;
  // When the editor should be in readonly mode (currently, same as "disabled"),
  // you can specify this flag with any editor instances.
  // NOTE: Setting this flag does not change the style of editor.  This just
  // changes the internal editor's readonly state.
  // NOTE: The readonly mode does NOT block XPCOM APIs which modify the editor
  // content.  This just blocks edit operations from user input and editing
  // commands (both HTML Document.execCommand and the XUL commands).
  // FIXME: XPCOM methods of TextEditor may be blocked by this flag.  If you
  // find it, file a bug.
  const long eEditorReadonlyMask        = 0x0008;
  // If you want an HTML editor to work as an email composer, specify this flag.
  // And you can specify this to text editor too for making spellchecker for
  // the text editor should work exactly same as email composer's.
  const long eEditorMailMask            = 0x0020;
  // allow the editor to set font: monospace on the root node
  const long eEditorEnableWrapHackMask  = 0x0040;
  // If you want to move focus from an HTML editor with tab navigation,
  // specify this flag.  This is not available with text editors becase
  // it's always tabbable.
  // Note that if this is not specified, link navigation is also enabled in
  // the editable content.
  const long eEditorAllowInteraction    = 0x0200;
  // when this flag is set, the internal direction of the editor is RTL.
  // if neither of the direction flags are set, the direction is determined
  // from the text control's content node.
  const long eEditorRightToLeft         = 0x0800;
  // when this flag is set, the internal direction of the editor is LTR.
  const long eEditorLeftToRight         = 0x1000;
  // when this flag is set, the editor's text content is not spell checked.
  const long eEditorSkipSpellCheck      = 0x2000;

  /*
   * The valid values for newlines handling.
   * Can't change the values unless we remove
   * use of the pref.
   */
  const long eNewlinesPasteIntact                = 0;
  const long eNewlinesPasteToFirst               = 1;
  const long eNewlinesReplaceWithSpaces          = 2;
  const long eNewlinesStrip                      = 3;
  const long eNewlinesReplaceWithCommas          = 4;
  const long eNewlinesStripSurroundingWhitespace = 5;

  readonly attribute Selection selection;

  [can_run_script]
  void setAttributeOrEquivalent(in Element element,
                                in AString sourceAttrName,
                                in AString sourceAttrValue,
                                in boolean aSuppressTransaction);
  [can_run_script]
  void removeAttributeOrEquivalent(in Element element,
                                   in AString sourceAttrName,
                                   in boolean aSuppressTransaction);

  /** edit flags for this editor.  May be set at any time. */
  [setter_can_run_script] attribute unsigned long flags;

  /**
   * the MimeType of the document
   */
  attribute AString contentsMIMEType;

  /** Returns true if we have a document that is not marked read-only */
  readonly attribute boolean isDocumentEditable;

  /** Returns true if the current selection anchor is editable */
  readonly attribute boolean isSelectionEditable;

  /**
   * the DOM Document this editor is associated with, refcounted.
   */
  readonly attribute Document document;

  /** the body element, i.e. the root of the editable document.
   */
  readonly attribute Element rootElement;

  /**
   * the selection controller for the current presentation, refcounted.
   */
  readonly attribute nsISelectionController selectionController;


  /* ------------ Selected content removal -------------- */

  /**
   * DeleteSelection removes all nodes in the current selection.
   * @param aDir  if eNext, delete to the right (for example, the DEL key)
   *              if ePrevious, delete to the left (for example, the BACKSPACE key)
   * @param stripWrappers If eStrip, strip any empty inline elements left
   *                      behind after the deletion; if eNoStrip, don't.  If in
   *                      doubt, pass eStrip -- eNoStrip is only for if you're
   *                      about to insert text or similar right after.
   */
  [can_run_script]
  void deleteSelection(in short action, in short stripWrappers);


  /* ------------ Document info and file methods -------------- */

  /** Returns true if the document has no *meaningful* content */
  readonly attribute boolean documentIsEmpty;

  /** Returns true if the document is modifed and needs saving */
  readonly attribute boolean documentModified;

  /**
   * Sets document's character set.  This is available only when the editor
   * instance is an HTMLEditor since it's odd to change character set of
   * parent document of `<input>` and `<textarea>`.
   */
  [setter_can_run_script]
  attribute ACString documentCharacterSet;

  /** to be used ONLY when we need to override the doc's modification
    * state (such as when it's saved).
    */
  [can_run_script]
  void resetModificationCount();

  /** Gets the modification count of the document we are editing.
    * @return the modification count of the document being edited.
    *         Zero means unchanged.
    */
  long getModificationCount();

  /** called each time we modify the document.
    * Increments the modification count of the document.
    * @param  aModCount  the number of modifications by which
    *                    to increase or decrease the count
    */
  [can_run_script]
  void incrementModificationCount(in long aModCount);

  /* ------------ Transaction methods -------------- */

  /** turn the undo system on or off
    * @param aEnable  if PR_TRUE, the undo system is turned on if available
    *                 if PR_FALSE the undo system is turned off if it
    *                 was previously on
    * @return         if aEnable is PR_TRUE, returns NS_OK if
    *                 the undo system could be initialized properly
    *                 if aEnable is PR_FALSE, returns NS_OK.
    */
  void enableUndo(in boolean enable);

  /**
   * Returns true when undo/redo is enabled (by default).
   */
  [infallible] readonly attribute boolean undoRedoEnabled;

  /**
   * Retruns true when undo/redo is enabled and there is one or more transaction
   * in the undo stack.
   */
  [infallible] readonly attribute boolean canUndo;

  /**
   * Returns true when undo/redo is enabled and there is one or more transaction
   * in the redo stack.
   */
  [infallible] readonly attribute boolean canRedo;

  /**
   * Clears the transactions both for undo and redo.
   * This may fail if you call this while editor is handling something, i.e.,
   * don't call this from a legacy mutation event listeners, then, you won't
   * see any exceptions.
   */
  [binaryname(ClearUndoRedoXPCOM)]
  void clearUndoRedo();

  /**
   * Undo the topmost transaction in the undo stack.
   * This may throw exception when this is called while editor is handling
   * transactions.
   */
  [can_run_script]
  void undo();

  /**
   * Undo all transactions in the undo stack.
   * This may throw exception when this is called while editor is handling
   * transactions.
   */
  [can_run_script]
  void undoAll();

  /**
   * Redo the topmost transaction in the redo stack.
   * This may throw exception when this is called while editor is handling
   * transactions.
   */
  [can_run_script]
  void redo();

  /** beginTransaction is a signal from the caller to the editor that
    * the caller will execute multiple updates to the content tree
    * that should be treated as a single logical operation,
    * in the most efficient way possible.<br>
    * All transactions executed between a call to beginTransaction and
    * endTransaction will be undoable as an atomic action.<br>
    * endTransaction must be called after beginTransaction.<br>
    * Calls to beginTransaction can be nested, as long as endTransaction
    * is called once per beginUpdate.
    */
  [can_run_script]
  void beginTransaction();

  /** endTransaction is a signal to the editor that the caller is
    * finished updating the content model.<br>
    * beginUpdate must be called before endTransaction is called.<br>
    * Calls to beginTransaction can be nested, as long as endTransaction
    * is called once per beginTransaction.
    */
  [can_run_script]
  void endTransaction();

  /* ------------ Inline Spell Checking methods -------------- */

  /** Returns the inline spell checker associated with this object. The spell
    * checker is lazily created, so this function may create the object for
    * you during this call.
    * @param  autoCreate  If true, this will create a spell checker object
    *                     if one does not exist yet for this editor. If false
    *                     and the object has not been created, this function
    *                     WILL RETURN NULL.
    */
  nsIInlineSpellChecker getInlineSpellChecker(in boolean autoCreate);

  /** Called when the user manually overrides the spellchecking state for this
    * editor.
    * @param  enable  The new state of spellchecking in this editor, as
    *                 requested by the user.
    */
  void setSpellcheckUserOverride(in boolean enable);

  /* ------------ Clipboard methods -------------- */

  /** cut the currently selected text, putting it into the OS clipboard
    * What if no text is selected?
    * What about mixed selections?
    * What are the clipboard formats?
    */
  [can_run_script]
  void cut();

  /**
   * canCut() returns true if selected content is allowed to be copied to the
   * clipboard and to be removed.
   * Note that this always returns true if the editor is in a non-chrome
   * HTML/XHTML document.
   * FYI: Current user in script is only BlueGriffon.
   */
  [can_run_script]
  boolean canCut();

  /** copy the currently selected text, putting it into the OS clipboard
    * What if no text is selected?
    * What about mixed selections?
    * What are the clipboard formats?
    */
  [can_run_script]
  void copy();

  /**
   * canCopy() returns true if selected content is allowed to be copied to
   * the clipboard.
   * Note that this always returns true if the editor is in a non-chrome
   * HTML/XHTML document.
   * FYI: Current user in script is only BlueGriffon.
   */
  [can_run_script]
  boolean canCopy();

  /** paste the text in the OS clipboard at the cursor position, replacing
    * the selected text (if any)
    */
  [can_run_script]
  void paste(in nsIClipboard_ClipboardType aClipboardType);

  /** Paste the text in |aTransferable| at the cursor position, replacing the
    * selected text (if any).
    */
  [can_run_script]
  void pasteTransferable(in nsITransferable aTransferable);

  /** Can we paste? True if the doc is modifiable, and we have
    * pasteable data in the clipboard.
    */
  boolean canPaste(in nsIClipboard_ClipboardType aClipboardType);

  /* ------------ Selection methods -------------- */

  /** sets the document selection to the entire contents of the document */
  [can_run_script]
  void selectAll();

  /**
   * Collapses selection at start of the document.  If it's an HTML editor,
   * collapses selection at start of current editing host (<body> element if
   * it's in designMode) instead.  If there is a non-editable node before any
   * editable text nodes or inline elements which can have text nodes as their
   * children, collapses selection at start of the editing host.  If there is
   * an editable text node which is not collapsed, collapses selection at
   * start of the text node.  If there is an editable inline element which
   * cannot have text nodes as its child, collapses selection at before the
   * element node.  Otherwise, collapses selection at start of the editing
   * host.
   */
  [can_run_script]
  void beginningOfDocument();

  /**
   * Sets the selection to the end of the last leaf child/descendant or the root
   * element.
   */
  [can_run_script]
  void endOfDocument();

  /* ------------ Node manipulation methods -------------- */

  /**
   * setAttribute() sets the attribute of aElement.
   * No checking is done to see if aAttribute is a legal attribute of the node,
   * or if aValue is a legal value of aAttribute.
   *
   * @param aElement    the content element to operate on
   * @param aAttribute  the string representation of the attribute to set
   * @param aValue      the value to set aAttribute to
   */
  [can_run_script]
  void setAttribute(in Element aElement, in AString attributestr,
                    in AString attvalue);

  /**
   * removeAttribute() deletes aAttribute from the attribute list of aElement.
   * If aAttribute is not an attribute of aElement, nothing is done.
   *
   * @param aElement      the content element to operate on
   * @param aAttribute    the string representation of the attribute to get
   */
  [can_run_script]
  void removeAttribute(in Element aElement,
                       in AString aAttribute);

  /**
   * cloneAttributes() is similar to Node::cloneNode(),
   *   it assures the attribute nodes of the destination are identical
   *   with the source node by copying all existing attributes from the
   *   source and deleting those not in the source.
   *   This is used when the destination element already exists
   *
   * @param aDestNode     the destination element to operate on
   * @param aSourceNode   the source element to copy attributes from
   */
  [can_run_script]
  void cloneAttributes(in Element aDestElement, in Element aSourceElement);

  /**
   * insertNode inserts aNode into aParent at aPosition and this operation is
   * undoable.
   * No checking is done to verify the legality of the insertion.
   * That is the responsibility of the caller.
   * TODO: Move this method to nsIHTMLEditor, TextEditor does not allow chrome
   * script to customize its anonymous subtree.
   *
   * @param aNode               The DOM Node to insert.
   * @param aParent             The node to insert the new object into
   * @param aPosition           The place in aParent to insert the new node
   *                            0=first child, 1=second child, etc.
   *                            If larger than number of children of aParent,
   *                            this will append aNode into aParent.
   * @param aPreseveSelection   The default value is false.  If set to true,
   *                            the insert node handler does not update
   *                            Selection.
   *                            FYI: If somebody handles `beforeinput` event or
   *                            `input` event caused by this and it does
   *                            something undoable, selection may be changed by
   *                            that.
   */
  [optional_argc, can_run_script]
  void insertNode(in Node node,
                  in Node parent,
                  in unsigned long aPosition,
                  [optional] in boolean aPreserveSelection);


  /**
   * deleteNode removes aChild from aParent and this operation is undobable.
   * TODO: Move this method to nsIHTMLEditor, TextEditor does not allow chrome
   * script to customize its anonymous subtree.
   *
   * @param aChild              The node to delete
   * @param aPreseveSelection   The default value is false.  If set to true,
   *                            the insert node handler does not update
   *                            Selection.
   *                            FYI: If somebody handles `beforeinput` event or
   *                            `input` event caused by this and it does
   *                            something undoable, selection may be changed by
   *                            that.
   */
  [optional_argc, can_run_script]
  void deleteNode(in Node child, [optional] in boolean aPreserveSelection);

/* ------------ Output methods -------------- */

  /**
   * Output methods:
   * aFormatType is a mime type, like text/plain.
   */
  AString outputToString(in AString formatType,
                         in unsigned long flags);

  /* ------------ Various listeners methods --------------
   * nsIEditor holds strong references to the editor observers, action listeners
   * and document state listeners.
   */

  /** add an EditActionListener to the editors list of listeners. */
  void addEditActionListener(in nsIEditActionListener listener);

  /** Remove an EditActionListener from the editor's list of listeners. */
  void removeEditActionListener(in nsIEditActionListener listener);

  /** Add a DocumentStateListener to the editors list of doc state listeners. */
  void addDocumentStateListener(in nsIDocumentStateListener listener);

  /** Remove a DocumentStateListener to the editors list of doc state listeners. */
  void removeDocumentStateListener(in nsIDocumentStateListener listener);

  /**
   * forceCompositionEnd() force the composition end
   */
  void forceCompositionEnd();

  /**
   * whether this editor has active IME transaction
   */
  readonly attribute boolean composing;

  /**
   * unmask() is available only when the editor is a passwrod field.  This
   * unmasks characters in specified by aStart and aEnd.  If there have
   * already unmasked characters, they are masked when this is called.
   * Note that if you calls this without non-zero `aTimeout`, you bear
   * responsibility for masking password with calling `mask()`.  I.e.,
   * user inputting password won't be masked automacitally.  If user types
   * a new character and echo is enabled, unmasked range is expanded to
   * including it.
   *
   * @param aStart      Optional, first index to show the character.  If you
   *                    specify middle of a surrogate pair, this expands the
   *                    range to include the prceding high surrogate
   *                    automatically.
   *                    If omitted, it means that all characters of the
   *                    password becomes unmasked.
   * @param aEnd        Optional, next index of last unmasked character.  If
   *                    you specify middle of a surrogate pair, the expands
   *                    the range to include the following low surrogate.
   *                    If omitted or negative value, it means unmasking all
   *                    characters after aStart.  Specifying same index
   *                    throws an exception.
   * @param aTimeout    Optional, specify milliseconds to hide the unmasked
   *                    characters if you want to show them temporarily.
   *                    If omitted or 0, it means this won't mask the characters
   *                    automatically.
   */
  [can_run_script, optional_argc] void unmask(
      [optional] in unsigned long aStart,
      [optional] in long long aEnd,
      [optional] in unsigned long aTimeout);

  /**
   * mask() is available only when the editor is a password field.  This masks
   * all unmasked characters immediately.
   */
  [can_run_script] void mask();

  /**
   * These attributes are available only when the editor is a password field.
   * unmaskedStart is first unmasked character index, or 0 if there is no
   * unmasked characters.
   * unmaskedEnd is next index of the last unmasked character.  0 means there
   * is no unmasked characters.
   */
  readonly attribute unsigned long unmaskedStart;
  readonly attribute unsigned long unmaskedEnd;

  /**
   * autoMaskingEnabled is true if unmasked range and newly inputted characters
   * are masked automatically.  That's the default state.  If false, until
   * `mask()` is called, unmasked range and newly inputted characters are
   * unmasked.
   */
  readonly attribute boolean autoMaskingEnabled;

  /**
   * passwordMask attribute is a mask character which is used to mask password.
   */
  readonly attribute AString passwordMask;

  /**
    * The length of the contents in characters.
    */
  readonly attribute unsigned long textLength;

  /** Get and set newline handling.
   *
   *  Values are the constants defined above.
   */
  attribute long newlineHandling;

  /**
   * Inserts a string at the current location,
   * given by the selection.
   * If the selection is not collapsed, the selection is deleted
   * and the insertion takes place at the resulting collapsed selection.
   *
   * @param aString   the string to be inserted
   */
   [can_run_script]
   void insertText(in AString aStringToInsert);

  /**
   * Insert a line break into the content model.
   * The interpretation of a break is up to the implementation:
   * it may enter a character, split a node in the tree, etc.
   * This may be more efficient than calling InsertText with a newline.
   */
  [can_run_script]
  void insertLineBreak();

%{C++
  inline bool IsHTMLEditor() const;
  inline bool IsTextEditor() const;

  /**
   * AsEditorBase() returns a pointer to EditorBase class.
   *
   * In order to avoid circular dependency issues, this method is defined
   * in mozilla/EditorBase.h.  Consumers need to #include that header.
   */
  inline mozilla::EditorBase* AsEditorBase();
  inline const mozilla::EditorBase* AsEditorBase() const;

  /**
   * AsTextEditor() and GetTextEditor() return a pointer to TextEditor class.
   * AsTextEditor() does not check the concrete class type.  So, it never
   * returns nullptr.  GetAsTextEditor() does check the concrete class type.
   * So, it may return nullptr.
   *
   * In order to avoid circular dependency issues, this method is defined
   * in mozilla/TextEditor.h.  Consumers need to #include that header.
   */
  inline mozilla::TextEditor* AsTextEditor();
  inline const mozilla::TextEditor* AsTextEditor() const;
  inline mozilla::TextEditor* GetAsTextEditor();
  inline const mozilla::TextEditor* GetAsTextEditor() const;

  /**
   * AsHTMLEditor() and GetHTMLEditor() return a pointer to HTMLEditor class.
   * AsHTMLEditor() does not check the concrete class type.  So, it never
   * returns nullptr.  GetAsHTMLEditor() does check the concrete class type.
   * So, it may return nullptr.
   *
   * In order to avoid circular dependency issues, this method is defined
   * in mozilla/HTMLEditor.h.  Consumers need to #include that header.
   */
  inline mozilla::HTMLEditor* AsHTMLEditor();
  inline const mozilla::HTMLEditor* AsHTMLEditor() const;
  inline mozilla::HTMLEditor* GetAsHTMLEditor();
  inline const mozilla::HTMLEditor* GetAsHTMLEditor() const;
%}
};