overleaf/services/web/frontend/js/features/source-editor/commands/select.ts

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import { EditorView } from '@codemirror/view'
import { EditorSelection, EditorState, StateCommand } from '@codemirror/state'
import { SearchQuery, StringQuery, selectWord } from '@codemirror/search'
export { selectNextOccurrence } from '@codemirror/search'
const findPrevOccurence = (state: EditorState, search: string) => {
const searchQuery = new SearchQuery({ search, literal: true })
const query = new StringQuery(searchQuery)
const { from, to } = state.selection.main
return query.prevMatch(state, from, to)
}
export const selectPrevOccurrence: StateCommand = ({ state, dispatch }) => {
const { ranges } = state.selection
if (ranges.some(range => range.from === range.to)) {
return selectWord({ state, dispatch })
}
const searchedText = state.sliceDoc(ranges[0].from, ranges[0].to)
if (
state.selection.ranges.some(
range => state.sliceDoc(range.from, range.to) !== searchedText
)
) {
return false
}
const range = findPrevOccurence(state, searchedText)
if (!range) {
return false
}
dispatch(
state.update({
selection: state.selection.addRange(
EditorSelection.range(range.from, range.to)
),
effects: EditorView.scrollIntoView(range.to),
})
)
return true
}