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import { keydownHandler } from 'prosemirror-keymap';
import { Selection, NodeSelection, TextSelection, Plugin } from 'prosemirror-state';
import { Slice, Fragment } from 'prosemirror-model';
import { DecorationSet, Decoration } from 'prosemirror-view';
/**
Gap cursor selections are represented using this class. Its
`$anchor` and `$head` properties both point at the cursor position.
*/
class GapCursor extends Selection {
/**
Create a gap cursor.
*/
constructor($pos) {
super($pos, $pos);
}
map(doc, mapping) {
let $pos = doc.resolve(mapping.map(this.head));
return GapCursor.valid($pos) ? new GapCursor($pos) : Selection.near($pos);
}
content() { return Slice.empty; }
eq(other) {
return other instanceof GapCursor && other.head == this.head;
}
toJSON() {
return { type: "gapcursor", pos: this.head };
}
/**
@internal
*/
static fromJSON(doc, json) {
if (typeof json.pos != "number")
throw new RangeError("Invalid input for GapCursor.fromJSON");
return new GapCursor(doc.resolve(json.pos));
}
/**
@internal
*/
getBookmark() { return new GapBookmark(this.anchor); }
/**
@internal
*/
static valid($pos) {
let parent = $pos.parent;
if (parent.isTextblock || !closedBefore($pos) || !closedAfter($pos))
return false;
let override = parent.type.spec.allowGapCursor;
if (override != null)
return override;
let deflt = parent.contentMatchAt($pos.index()).defaultType;
return deflt && deflt.isTextblock;
}
/**
@internal
*/
static findGapCursorFrom($pos, dir, mustMove = false) {
search: for (;;) {
if (!mustMove && GapCursor.valid($pos))
return $pos;
let pos = $pos.pos, next = null;
// Scan up from this position
for (let d = $pos.depth;; d--) {
let parent = $pos.node(d);
if (dir > 0 ? $pos.indexAfter(d) < parent.childCount : $pos.index(d) > 0) {
next = parent.child(dir > 0 ? $pos.indexAfter(d) : $pos.index(d) - 1);
break;
}
else if (d == 0) {
return null;
}
pos += dir;
let $cur = $pos.doc.resolve(pos);
if (GapCursor.valid($cur))
return $cur;
}
// And then down into the next node
for (;;) {
let inside = dir > 0 ? next.firstChild : next.lastChild;
if (!inside) {
if (next.isAtom && !next.isText && !NodeSelection.isSelectable(next)) {
$pos = $pos.doc.resolve(pos + next.nodeSize * dir);
mustMove = false;
continue search;
}
break;
}
next = inside;
pos += dir;
let $cur = $pos.doc.resolve(pos);
if (GapCursor.valid($cur))
return $cur;
}
return null;
}
}
}
GapCursor.prototype.visible = false;
GapCursor.findFrom = GapCursor.findGapCursorFrom;
Selection.jsonID("gapcursor", GapCursor);
class GapBookmark {
constructor(pos) {
this.pos = pos;
}
map(mapping) {
return new GapBookmark(mapping.map(this.pos));
}
resolve(doc) {
let $pos = doc.resolve(this.pos);
return GapCursor.valid($pos) ? new GapCursor($pos) : Selection.near($pos);
}
}
function needsGap(type) {
return type.isAtom || type.spec.isolating || type.spec.createGapCursor;
}
function closedBefore($pos) {
for (let d = $pos.depth; d >= 0; d--) {
let index = $pos.index(d), parent = $pos.node(d);
// At the start of this parent, look at next one
if (index == 0) {
if (parent.type.spec.isolating)
return true;
continue;
}
// See if the node before (or its first ancestor) is closed
for (let before = parent.child(index - 1);; before = before.lastChild) {
if ((before.childCount == 0 && !before.inlineContent) || needsGap(before.type))
return true;
if (before.inlineContent)
return false;
}
}
// Hit start of document
return true;
}
function closedAfter($pos) {
for (let d = $pos.depth; d >= 0; d--) {
let index = $pos.indexAfter(d), parent = $pos.node(d);
if (index == parent.childCount) {
if (parent.type.spec.isolating)
return true;
continue;
}
for (let after = parent.child(index);; after = after.firstChild) {
if ((after.childCount == 0 && !after.inlineContent) || needsGap(after.type))
return true;
if (after.inlineContent)
return false;
}
}
return true;
}
/**
Create a gap cursor plugin. When enabled, this will capture clicks
near and arrow-key-motion past places that don't have a normally
selectable position nearby, and create a gap cursor selection for
them. The cursor is drawn as an element with class
`ProseMirror-gapcursor`. You can either include
`style/gapcursor.css` from the package's directory or add your own
styles to make it visible.
*/
function gapCursor() {
return new Plugin({
props: {
decorations: drawGapCursor,
createSelectionBetween(_view, $anchor, $head) {
return $anchor.pos == $head.pos && GapCursor.valid($head) ? new GapCursor($head) : null;
},
handleClick,
handleKeyDown,
handleDOMEvents: { beforeinput: beforeinput }
}
});
}
const handleKeyDown = keydownHandler({
"ArrowLeft": arrow("horiz", -1),
"ArrowRight": arrow("horiz", 1),
"ArrowUp": arrow("vert", -1),
"ArrowDown": arrow("vert", 1)
});
function arrow(axis, dir) {
const dirStr = axis == "vert" ? (dir > 0 ? "down" : "up") : (dir > 0 ? "right" : "left");
return function (state, dispatch, view) {
let sel = state.selection;
let $start = dir > 0 ? sel.$to : sel.$from, mustMove = sel.empty;
if (sel instanceof TextSelection) {
if (!view.endOfTextblock(dirStr) || $start.depth == 0)
return false;
mustMove = false;
$start = state.doc.resolve(dir > 0 ? $start.after() : $start.before());
}
let $found = GapCursor.findGapCursorFrom($start, dir, mustMove);
if (!$found)
return false;
if (dispatch)
dispatch(state.tr.setSelection(new GapCursor($found)));
return true;
};
}
function handleClick(view, pos, event) {
if (!view || !view.editable)
return false;
let $pos = view.state.doc.resolve(pos);
if (!GapCursor.valid($pos))
return false;
let clickPos = view.posAtCoords({ left: event.clientX, top: event.clientY });
if (clickPos && clickPos.inside > -1 && NodeSelection.isSelectable(view.state.doc.nodeAt(clickPos.inside)))
return false;
view.dispatch(view.state.tr.setSelection(new GapCursor($pos)));
return true;
}
// This is a hack that, when a composition starts while a gap cursor
// is active, quickly creates an inline context for the composition to
// happen in, to avoid it being aborted by the DOM selection being
// moved into a valid position.
function beforeinput(view, event) {
if (event.inputType != "insertCompositionText" || !(view.state.selection instanceof GapCursor))
return false;
let { $from } = view.state.selection;
let insert = $from.parent.contentMatchAt($from.index()).findWrapping(view.state.schema.nodes.text);
if (!insert)
return false;
let frag = Fragment.empty;
for (let i = insert.length - 1; i >= 0; i--)
frag = Fragment.from(insert[i].createAndFill(null, frag));
let tr = view.state.tr.replace($from.pos, $from.pos, new Slice(frag, 0, 0));
tr.setSelection(TextSelection.near(tr.doc.resolve($from.pos + 1)));
view.dispatch(tr);
return false;
}
function drawGapCursor(state) {
if (!(state.selection instanceof GapCursor))
return null;
let node = document.createElement("div");
node.className = "ProseMirror-gapcursor";
return DecorationSet.create(state.doc, [Decoration.widget(state.selection.head, node, { key: "gapcursor" })]);
}
export { GapCursor, gapCursor };